E:\a327ex\Anchor\docs\SHAPES_PLAN.md
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md
E:\a327ex\Anchor\docs\ANCHOR.md

1→# Shapes Rendering System — Implementation Plan
     2→
     3→A comprehensive 2D vector graphics system for Anchor, inspired by Freya Holmér's Shapes plugin for Unity. SDF-based rendering for clean edges at any scale, with full support for gradients, dashes, outlines, and texture fills.
     4→
     5→---
     6→
     7→## Goals
     8→
     9→- **High-quality rendering**: Local anti-aliasing built into all shapes, smooth edges without relying on MSAA
    10→- **Arbitrary thickness**: Lines and outlines at any pixel width, with proper thinness fading for sub-pixel sizes
    11→- **Rich styling**: Gradients (linear, radial, angular, bilinear), dashes, outlines, texture fills
    12→- **Efficient batching**: Minimize draw calls via uber-shader approach
    13→- **Simple API**: Transforms via push/pop stack, shapes are just position + size + style
    14→
    15→---
    16→
    17→## Reference Implementation: Cute Framework
    18→
    19→Randy Gaul's [Cute Framework](https://github.com/RandyGaul/cute_framework) uses a similar SDF approach and serves as a practical reference for our implementation. Key insights:
    20→
    21→### Vertex Format
    22→
    23→Cute Framework's `CF_Vertex` stores shape data directly in vertices:
    24→
    25→```c
    26→struct CF_Vertex {
    27→    CF_V2 p;           // World space position
    28→    CF_V2 posH;        // Camera-transformed position
    29→    int n;             // Vertex count (for polygons)
    30→    CF_V2 shape[8];    // 8 control points (16 floats) for SDF shapes
... [1452 more lines]

1→/*
     2→ * Anchor Engine
     3→ * Phase 1: Window + OpenGL + Lua integration
     4→ * Phase 2: Web build (Emscripten/WebGL)
     5→ * Phase 3: Rendering (layers, shapes, sprites, transforms, blend modes)
     6→ */
     7→
     8→#include <stdio.h>
     9→#include <stdlib.h>
    10→#include <stdbool.h>
    11→#include <string.h>
    12→#include <math.h>
    13→
    14→#ifdef _WIN32
    15→#include <direct.h>  // _chdir
    16→#else
    17→#include <unistd.h>  // chdir
    18→#endif
    19→
    20→#include <SDL.h>
    21→
    22→#ifdef __EMSCRIPTEN__
    23→    #include <emscripten.h>
    24→    #include <emscripten/html5.h>
    25→    #include <GLES3/gl3.h>
    26→#else
    27→    #include <glad/gl.h>
    28→#endif
    29→
    30→#include <lua.h>
... [1503 more lines]

[
  {
    "type": "text",
    "text": "Excellent! Now I have enough information. Let me compile a comprehensive report with all the key findings.\n\n## Detailed Findings: Super Emoji Box Effects System\n\nI've thoroughly explored the super emoji box reference game and documented how effects/shaders are implemented. Here are the detailed findings:\n\n### Overview of the Effects Architecture\n\nThe game uses a **multi-layer canvas + shader system** where effects are applied at the canvas level rather than to individual objects. This is a post-processing approach combined with per-object shader application.\n\n---\n\n### Shader Files and Their Purposes\n\n**1. outline.frag** (E:/a327ex/Anchor/reference/super emoji box/assets/outline.frag)\n```glsl\nvec4 effect(vec4 vcolor, Image texture, vec2 tc, vec2 pc) {\n  vec4 t = Texel(texture, tc);\n  float x = 1.0/love_ScreenSize.x;\n  float y = 1.0/love_ScreenSize.y;\n\n  float a = 0.0;\n  a += Texel(texture, vec2(tc.x - 2.0*x, tc.y - 2.0*y)).a;\n  a += Texel(texture, vec2(tc.x - x, tc.y - 2.0*y)).a;\n  // ... samples 24 neighboring pixels in a 5x5 grid\n  a = min(a, 1.0);\n\n  return vec4(0.0, 0.0, 0.0, a);\n}\n```\n- Creates a **black outline** around objects by detecting alpha edges\n- Samples 24 neighboring pixels to detect where alpha transitions occur\n- Returns a black silhouette that's rendered underneath objects\n- Used for UI elements and various game objects\n\n**2. shadow.frag** (E:/a327ex/Anchor/reference/super emoji box/assets/shadow.frag)\n```glsl\nvec4 effect(vec4 vcolor, Image texture, vec2 tc, vec2 pc) {\n  return vec4(0.1, 0.1, 0.1, Texel(texture, tc).a*0.2);\n}\n```\n- Creates a **dark shadow** effect\n- Outputs dark gray (0.1, 0.1, 0.1) with 20% of the texture's alpha\n- Much simpler than outline - just darkens and fades the original\n\n**3. combine.frag** (E:/a327ex/Anchor/reference/super emoji box/assets/combine.frag)\n```glsl\nvec4 effect(vec4 vcolor, Image texture, vec2 tc, vec2 pc) {\n  vec4 t = Texel(texture, tc);\n  return vec4(vcolor.rgb + t.rgb, t.a);\n}\n```\n- **Additive color blending** for flashing effects\n- Adds the vcolor (from drawing code) to the texture's RGB\n- Preserves original alpha\n- Used when objects flash white\n\n---\n\n### How Effects Are Applied to Layers\n\n**Layer Setup (main.lua lines 7-28):**\n```lua\nback = object():layer()\nback_2 = object():layer()\nshadow = object():layer()\ngame = object():layer()\ngame_2 = object():layer()\nfront = object():layer()\nfront_2 = object():layer()\neffects = object():layer()\neffects_2 = object():layer()\nui_back = object():layer()\nui = object():layer()\nui_2 = object():layer()\n\n-- Add a second canvas to each layer for outline rendering\nback_2:layer_add_canvas('outline')\ngame:layer_add_canvas('outline')\ngame_2:layer_add_canvas('outline')\nfront:layer_add_canvas('outline')\nfront_2:layer_add_canvas('outline')\neffects:layer_add_canvas('outline')\neffects_2:layer_add_canvas('outline')\nui:layer_add_canvas('outline')\nui_2:layer_add_canvas('outline')\n```\n\nKey insight: Each layer has **two canvases**:\n- **'main'** - for normal drawing\n- **'outline'** - for outline effect rendering\n\n**Shader Registration (main.lua lines 38-40):**\n```lua\nlun:shader('combine', nil, 'assets/combine.frag')\nlun:shader('shadow', nil, 'assets/shadow.frag')\nlun:shader('outline', nil, 'assets/outline.frag')\n```\n\nShaders are registered with:\n- Name (how they're accessed)\n- Vertex shader (nil = use default)\n- Fragment shader path\n\n---\n\n### Effect Chaining and Rendering Pipeline\n\n**Main draw_layers function (main.lua lines 117-171):**\n\nThe rendering happens in this order:\n\n```lua\nfunction lun:draw_layers()\n  -- Step 1: Draw all normal draw commands to each layer's 'main' canvas\n  back:layer_draw_commands()\n  back_2:layer_draw_commands()\n  game:layer_draw_commands()\n  -- ... etc for all layers\n  \n  -- Step 2: Generate outline canvases by re-drawing each layer with outline shader\n  back_2:layer_draw_to_canvas('outline', function() \n    back_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) \n  end)\n  game:layer_draw_to_canvas('outline', function() \n    game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) \n  end)\n  -- ... etc for all layers that need outlines\n  \n  -- Step 3: Generate shadow canvas\n  shadow:layer_draw_to_canvas('main', function()\n    game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)\n    effects:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)\n  end)\n  \n  -- Step 4: Composite everything to final output\n  self:layer_draw_to_canvas('main', function()\n    back:layer_draw()  -- no effects\n    back_2:layer_draw('outline')  -- draw outline from outline canvas\n    back_2:layer_draw()  -- draw main layer on top\n    shadow.x, shadow.y = 2*lun.sx, 2*lun.sy  -- offset shadow for drop effect\n    shadow:layer_draw()  -- draw shadow (offset)\n    game:layer_draw('outline')  -- draw outline\n    game:layer_draw()  -- draw main\n    game_2:layer_draw('outline')\n    game_2:layer_draw()\n    front:layer_draw('outline')\n    front:layer_draw()\n    front_2:layer_draw('outline')\n    front_2:layer_draw()\n    effects:layer_draw('outline')\n    effects:layer_draw()\n    effects_2:layer_draw('outline')\n    effects_2:layer_draw()\n    ui_back:layer_draw()\n    ui:layer_draw('outline')\n    ui:layer_draw()\n    ui_2:layer_draw('outline')\n    ui_2:layer_draw()\n  end)\n  \n  -- Step 5: Draw final composite to screen\n  self:layer_draw('main', 0, 0, 0, self.sx, self.sy)\nend\n```\n\n**The Pipeline Flow:**\n1. Layers draw their commands to 'main' canvas (normal rendering)\n2. Outline effect: Take 'main' canvas \u2192 apply outline shader \u2192 store in 'outline' canvas\n3. Shadow effect: Take 'game' and 'effects' 'main' canvases \u2192 apply shadow shader \u2192 store in shadow layer's 'main' canvas\n4. Composite: Draw outline canvases (darker, behind), then main canvases (on top), then shadow layer (offset for depth)\n5. Final: Draw the composite to screen with scaling\n\n---\n\n### Per-Object Shader Usage\n\nShaders can also be applied directly when drawing individual objects. Example (main.lua line 412):\n```lua\ngame:draw_image(emoji, self.x, self.y, self.visual_angle, self.sx*s*self.springs.jump_x.x, \n  self.sy*s*self.springs.jump_y.x, nil, nil, lun.colors.white[0], \n  self.flashing and lun.shaders.combine)\n```\n\nThis applies the `combine` shader only when the object is flashing (`self.flashing == true`).\n\nOther examples:\n- Line 505: Dagger uses combine shader when flashing\n- Line 644: Enemy uses combine shader when flashing or charging\n- Line 773: Star particles use combine shader when flashing\n\n---\n\n### Canvas System (layer.lua)\n\n**Canvas Creation (layer.lua lines 226-232):**\n```lua\nfunction layer:layer_add_canvas(name)\n  if lun.visual_mode == 'smooth' then\n    self.canvas[name] = love.graphics.newCanvas(lun.w, lun.h, {msaa = 8})\n  else\n    self.canvas[name] = love.graphics.newCanvas(lun.w, lun.h)\n  end\nend\n```\n\n**Drawing to Canvas (layer.lua lines 279-284):**\n```lua\nfunction layer:layer_draw_to_canvas(name, action)\n  love.graphics.setCanvas({self.canvas[name or 'main'], stencil=true})\n  love.graphics.clear()\n  action()\n  love.graphics.setCanvas()\nend\n```\n\n**Canvas Rendering with Effects (layer.lua lines 239-253):**\n```lua\nfunction layer:layer_draw(name, x, y, r, sx, sy, color, shader, alphamultiply)\n  local color = color or lun.colors.white[0]\n  if shader then love.graphics.setShader(shader.object) end\n  if alphamultiply then\n    love.graphics.setColor(color.r, color.g, color.b, color.a)\n    love.graphics.draw(self.canvas[name or 'main'], x or self.x or 0, y or self.y or 0, r or 0, sx or 1, sy or sx or 1)\n  else\n    love.graphics.setColor(color.r, color.g, color.b, color.a)\n    love.graphics.setBlendMode('alpha', 'premultiplied')\n    love.graphics.draw(self.canvas[name or 'main'], x or self.x or 0, y or self.y or 0, r or 0, sx or 1, sy or sx or 1)\n    love.graphics.setBlendMode('alpha')\n  end\n  love.graphics.setColor(1, 1, 1, 1)\n  if shader then love.graphics.setShader() end\nend\n```\n\n---\n\n### Key Technical Patterns\n\n**1. Multi-canvas per layer:**\nEach layer can have multiple named canvases. The 'main' canvas is for primary rendering; additional canvases (like 'outline') are for effect outputs.\n\n**2. Effect re-rendering:**\nTo apply an effect to a layer, the game re-renders the 'main' canvas **with a shader applied**, storing the result in an 'outline' canvas. This is a post-processing technique.\n\n**3. Depth via rendering order:**\nEffects layering is controlled entirely by drawing order:\n- Outline canvas (drawn first, appears behind)\n- Main canvas (drawn on top)\n- Shadow layer (offset for drop shadow effect)\n\n**4. Conditional per-object shaders:**\nThe combine shader is only applied when an object is in a specific state (flashing, charging), using conditional logic: `self.flashing and lun.shaders.combine`\n\n**5. Blend modes:**\nCanvas rendering uses `'premultiplied'` alpha blending for proper compositing when alphamultiply is false, and standard alpha blending when true.\n\n---\n\n### Summary Table\n\n| Effect | Shader | Application | Purpose |\n|--------|--------|-------------|---------|\n| **Outline** | outline.frag | Canvas-level (entire layer) | Black silhouette behind objects for visual definition |\n| **Shadow** | shadow.frag | Canvas-level (game + effects) | Dark drop shadow offset by (2px, 2py) |\n| **Flash** | combine.frag | Per-object (when flashing) | White additive glow when taking damage or attacking |\n\nAll three effects use L\u00d6VE 2D's built-in shader framework with fragment shaders that operate on texture data and screen size uniforms."
  },
  {
    "type": "text",
    "text": "agentId: ae26758 (for resuming to continue this agent's work if needed)"
  }
]

[
  {
    "type": "text",
    "text": "Perfect! Now I have everything I need. Let me compile a comprehensive report:\n\n## Summary\n\nI've searched the Anchor codebase thoroughly and found extensive documentation on BYTEPATH and SNKRX, along with detailed shader/effect chaining patterns from the L\u00d6VE-based reference implementation. Here's what I discovered:\n\n## BYTEPATH and SNKRX Context\n\n**From the logs and documentation:**\n- Both BYTEPATH and SNKRX are games shipped by a327ex (the Anchor developer)\n- According to analysis in the implementation plan interview (`website/logs/2026-01-03_15-30.md`), neither game actually uses pixel-level effects that require special renderer treatment\n- The actual effects used in both games are: **circles, shapes, screen shake, particles, and additive blending for explosions/energy effects**\n- BYTEPATH was the primary example when discussing pixel control preferences, but the developer acknowledged not having concrete pixel-level effects actually used in shipped code\n\n## Effect/Shader Chaining Patterns\n\n**From the L\u00d6VE reference implementation** (`reference/love-compare/` and `reference/super emoji box/`):\n\n### 1. **Shader System Architecture**\n\nThe L\u00d6VE framework implements shaders with a simple, composable pattern:\n\n```lua\n-- Load shaders at startup\nan:shader('outline', nil, 'assets/outline.frag')\nan:shader('shadow', nil, 'assets/shadow.frag')\nan:shader('combine', nil, 'assets/combine.frag')\n```\n\nLocated in: `/E:\\a327ex\\Anchor\\reference\\love-compare\\anchor\\init.lua` (lines 372-378)\n\n### 2. **Concrete Shader Examples**\n\n**Outline Shader** (`/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\outline.frag`):\n- Samples 24 neighbor pixels in a 5x5 grid around the center pixel\n- Accumulates alpha values from neighbors\n- Returns a black outline with composite alpha\n- Used for visual emphasis without adding filled shapes\n\n**Shadow Shader** (`/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\shadow.frag`):\n```glsl\nvec4 effect(vec4 vcolor, Image texture, vec2 tc, vec2 pc) {\n  return vec4(0.1, 0.1, 0.1, Texel(texture, tc).a*0.2);\n}\n```\n- Simple darkened, semi-transparent version of the input\n- Reduces alpha to 20% and darkens RGB\n- Creates drop shadow effect\n\n**Additive Blending Shader** (`/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\combine.frag`):\n```glsl\nvec4 effect(vec4 vcolor, Image texture, vec2 tc, vec2 pc) {\n  vec4 t = Texel(texture, tc);\n  return vec4(vcolor.rgb + t.rgb, t.a);\n}\n```\n- Adds texture color to vertex color (additive blending)\n- Used for glows, explosions, energy effects\n- Preserves alpha from texture\n\n### 3. **Effect Chaining via Layers and Canvases**\n\nThe L\u00d6VE implementation uses a **multi-canvas approach** for compositing effects:\n\n```lua\n-- Layer system with multiple named canvases\ngame:layer_add_canvas('main')      -- Primary rendering\ngame:layer_add_canvas('outline')   -- Outline rendering pass\ngame:layer_add_canvas('shadow')    -- Shadow rendering pass\n\n-- Draw to specific canvas\ngame:layer_draw_to_canvas('outline', function()\n  -- Render objects to outline canvas\nend)\n\n-- Composite by drawing canvases with shaders\ngame:layer_draw('outline', x, y, 0, 1, 1, color, 'outline_shader')\ngame:layer_draw('shadow', x, y, 0, 1, 1, color, 'shadow_shader')\ngame:layer_draw('main', x, y, 0, 1, 1, nil, nil)\n```\n\nLocated in: `/E:\\a327ex\\Anchor\\reference\\love-compare\\anchor\\layer.lua` (lines 316-339)\n\n### 4. **Per-Object Shader Application**\n\nShaders can be applied to individual draw calls:\n\n```lua\n-- Draw with shader parameter (9th argument)\nlayer:draw_image(name, x, y, r, sx, sy, ox, oy, color, shader)\n\n-- Implementation\nfunction graphics.draw_image(name, x, y, r, sx, sy, ox, oy, color, shader)\n  local drawable = an.images[name]\n  _r, g, b, a = love.graphics.getColor()\n  if color then love.graphics.setColor(color.r, color.g, color.b, color.a) end\n  if shader then love.graphics.setShader(an.shaders[shader].source) end\n  love.graphics.draw(drawable.source, x, y, r or 0, sx or 1, sy or sx or 1, \n                     drawable.w*0.5 + (ox or 0), drawable.h*0.5 + (oy or 0))\n  if shader then love.graphics.setShader() end\n  if color then love.graphics.setColor(_r, g, b, a) end\nend\n```\n\nLocated in: `/E:\\a327ex\\Anchor\\reference\\love-compare\\anchor\\layer.lua` (lines 110-118)\n\n### 5. **Shader Uniform Configuration**\n\nThe framework provides a shader_send function for runtime uniforms:\n\n```lua\nfunction graphics.shader_send(name, id, ...)\n  an.shaders[name].source:send(id, ...)\nend\n```\n\nThis allows effects to be configured dynamically without recompiling shaders.\n\n## Key Architectural Insights\n\n1. **No effect \"chaining\" in the traditional sense** \u2014 Effects are composed through:\n   - Multiple rendering passes to different canvases\n   - Layer ordering and compositing\n   - Per-object shader selection\n   - Blend mode changes between passes\n\n2. **Effects are stateless** \u2014 Each shader is a fragment program that processes pixels independently. Complexity comes from:\n   - Sampling multiple neighbors (outline shader)\n   - Multiple rendering passes for layered effects\n   - Order of composition (shadows behind, outlines on top, etc.)\n\n3. **The \"shader_send\" pattern allows parameter passing**:\n   ```lua\n   -- Configure shader at runtime\n   an:shader_send('outline', 'thickness', 2)\n   an:shader_send('outline', 'color', {r=0, g=0, b=0, a=1})\n   ```\n\n4. **L\u00d6VE's hidden abstraction** \u2014 Games use `layer:draw()` without touching GLSL directly. The shader switching and state management is hidden in the graphics module.\n\n## Files Examined\n\nAbsolute paths of all relevant code:\n\n- `/E:\\a327ex\\Anchor\\reference\\love-compare\\anchor\\init.lua` \u2014 Shader loading system\n- `/E:\\a327ex\\Anchor\\reference\\love-compare\\anchor\\layer.lua` \u2014 Drawing and effect application  \n- `/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\outline.frag` \u2014 Outline effect shader\n- `/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\shadow.frag` \u2014 Shadow effect shader\n- `/E:\\a327ex\\Anchor\\reference\\super emoji box\\assets\\combine.frag` \u2014 Additive blending shader\n- `/E:\\a327ex\\Anchor\\website\\logs\\2026-01-03_15-30.md` \u2014 Detailed discussion of BYTEPATH/SNKRX effects\n\nThe pattern is remarkably simple: **no complex chaining mechanism, just multiple rendering passes with optional shader application per pass, all orchestrated through the layer system.**"
  },
  {
    "type": "text",
    "text": "agentId: a69374f (for resuming to continue this agent's work if needed)"
  }
]

# BYTEPATH Repository Structure Analysis

Based on the GitHub repository content provided, I cannot identify any shader files (.glsl, .frag, .vert) or dedicated graphics/effects modules in the visible structure.

## Repository Contents:
The repository shows these main directories:

- `libraries/` - likely utility libraries
- `love/` - LÖVE 2D framework files
- `objects/` - game object definitions
- `resources/` - assets (images, audio, etc.)
- `rooms/` - level/scene files
- `tutorial/` - educational materials

## Key Files:
Root-level Lua files include `GameObject.lua`, `main.lua`, `globals.lua`, `tree.lua`, `utils.lua`, and `conf.lua`.

## Conclusion:
The project uses LÖVE 2D (a framework written in Lua) and appears to handle rendering through Lua rather than explicit shader files. Any graphics effects would likely be implemented in the `objects/` directory or core Lua files. The "59.6% Lua" composition suggests shader effects, if present, would be in Lua rather than GLSL format.

To locate specific post-processing logic, you'd need to examine the `objects/` folder contents or core Lua files directly on GitHub.

# Files in the BYTEPATH Objects Directory

Based on the GitHub repository structure, the `/objects` directory contains 27 items:

## Subdirectories:

- `effects/` - Contains effect-related files
- `enemies/` - Contains enemy object files
- `modules/` - Contains modular code files

## Individual Files (selected relevant ones):

- **Explosion.lua** - Handles explosion visual effects
- **Shake.lua** - Manages screen shake effects
- **Projectile.lua** - Projectile mechanics
- **EnemyProjectile.lua** - Enemy projectile handling

The `effects/` subdirectory appears to be the primary location for graphics and visual effect code, though the specific files within it aren't detailed in this listing. The Explosion and Shake files suggest the project implements particle effects and screen distortion mechanics typical of action games.

# Files in the Effects Directory

Based on the GitHub repository listing, here are the 25 files in the `objects/effects` directory:

1. **AmmoEffect.lua** - Visual effect triggered when ammunition is used or depleted
2. **AttackEffect.lua** - Effect displayed during player or enemy attacks
3. **BoostEffect.lua** - Visual feedback for speed or power boost activation
4. **CycleEffect.lua** - Effect for cycling through weapons or abilities
5. **EnemyDeathEffect.lua** - Particle or visual effect when enemies are defeated
6. **ExplodeParticles.lua** - Explosion particle system implementation
7. **GlitchBlockDisplacement.lua** - Glitch effect displacing block-based visuals
8. **GlitchDisplacement.lua** - General glitch visual distortion effect
9. **GlitchDisplacementC.lua** - Variant of glitch displacement (possibly contextual)
10. **GlitherShootEffect.lua** - Shoot effect with glitch visual style
11. **LaserLine.lua** - Rendering for laser beam projectiles
12. **LightningLine.lua** - Visual representation of lightning attacks
13. **PreAttackEffect.lua** - Anticipatory visual effect before attacks land
14. **ProjectileDeathEffect.lua** - Effect when projectiles are destroyed
15. **ProjectileTrails.lua** - Trail particles following projectile paths
16. **RGBShift.lua** - Color shifting effect (red-green-blue displacement)
17. **ShapeEffect.lua** - Geometric shape-based visual effects
18. **ShapeEffect2.lua** - Alternative shape effect variant
19. **ShockwaveDisplacement.lua** - Wave-based visual distortion from impacts
20. **ShootEffect.lua** - Standard shooting/firing visual effect
21. **TargetParticle.lua** - Particles marking targeted objects
22. **TrailParticle.lua** - Individual trail particle behavior
23. **TrailParticles.lua** - System managing multiple trail particles
24. **TrailerShootEffect.lua** - Shoot effect with trailing visuals
25. **WaverPreAttackEffect.lua** - Wavy distortion before attack execution

# RGBShift Class Analysis

This Lua code defines an `RGBShift` class that creates glitch-effect visual elements in what appears to be a LÖVE 2D game framework.

## Core Functionality

The class generates temporary visual artifacts that simulate RGB color shifting glitches. Upon instantiation, it randomly selects between two glitch manifestations:

1. **Horizontal Bar Shift**: A wide, thin rectangular bar spanning most of the screen width with random height
2. **Rectangular Block Shift**: A smaller rectangular block with randomized dimensions

## Visual Behavior

Each glitch element initializes with a slightly offset grayscale color value: `"local r = 127 + love.math.random(-4, 4)*(glitch/10)"`. This color then smoothly tweens back to neutral gray (127, 127, 127) over a brief duration (0.05-0.4 seconds) using cubic easing before the object marks itself for deletion.

## Rendering

The `draw()` function renders the rectangle using the current color state, then resets the graphics color to white—ensuring subsequent drawing operations aren't affected.

## Shader/Post-Processing Note

This code implements **no shader or post-processing effects**. It's a straightforward object-based approach using primitive rectangles with color interpolation to simulate glitch visuals.

# Shader and Post-Processing Analysis

## Shader Loading
The codebase loads shaders during initialization:

```lua
function loadShaders(path)
    shaders = {}
    local shader_paths = {}
    recursiveEnumerate(path, shader_paths)
    for _, shader_path in pairs(shader_paths) do
        local shader_name = shader_path:sub(last_forward_slash_index+1, -6)
        local shader = love.graphics.newShader(shader_path)
        shaders[shader_name] = shader
    end
end
```

Shaders are stored in a global `shaders` table indexed by name.

## Post-Processing Effects

The main.lua implements several post-processing capabilities:

1. **Flash Effect**: A screen overlay that briefly displays the background color
2. **Slow Motion**: Time dilation applied to game updates via `slow_amount`
3. **Frame Stopping**: Physics-based freeze effect for specific object types
4. **Shader Disabling**: Dynamic shader toggling based on FPS performance

## Rendering Pipeline
... [4 more lines]

# Shader Files in BYTEPATH/resources/shaders

Based on the GitHub repository directory listing, there are **8 shader files** available:

1. **combine.frag**
2. **displacement.frag**
3. **distort.frag**
4. **flat_color.frag**
5. **glitch.frag**
6. **grayscale.frag**
7. **rgb.frag**
8. **rgb_shift.frag**

All files use the `.frag` extension, indicating they are fragment shaders. These appear to represent various post-processing visual effects ranging from color manipulation (grayscale, RGB operations) to distortion-based effects (displacement, distort, glitch).

# Shader Analysis

This GLSL shader creates a **CRT (cathode ray tube) monitor effect** with customizable visual distortions.

## Key Components:

**External Parameters:**

- `scanlines` (0.5): Controls horizontal line intensity
- `rgb_offset` (0.2): Separates color channels for chromatic aberration
- `horizontal_fuzz` (0.5): Controls jitter amount
- `time`: Animation input

**Core Effects:**

1. **Noise Generation**: Uses Simplex noise (from WebGL noise library) to create two layers of temporal distortion—fast and slow variations.

2. **Chromatic Aberration**: Samples red, green, and blue channels at slightly offset horizontal positions, mimicking color separation seen on old displays.

3. **Horizontal Jitter**: Applies noise-based horizontal displacement that varies over time and screen height, creating the characteristic "wiggle" of aging monitors.

4. **Scanlines**: Adds horizontal striping by subtracting a sine wave pattern based on vertical position, darkening the image at regular intervals.

The `effect()` function combines these distortions to transform the input texture, producing an authentic vintage CRT aesthetic suitable for retro gaming or nostalgic visual effects.

# BYTEPATH Room Files

Based on the GitHub repository structure, here are all the room files in the `/rooms` directory:

1. **AchievementScreenshots.lua**
2. **Achievements.lua**
3. **Classes.lua**
4. **Console.lua**
5. **Director.lua**
6. **SkillTree.lua**
7. **Stage.lua**

## Main Game Arena

The file you're looking for is likely **Stage.lua**. This is the conventional naming pattern for the primary gameplay environment where post-processing effects would typically be applied in game development projects.

To examine post-processing implementation, you would need to review the Stage.lua file's source code directly from the repository at `/a327ex/BYTEPATH/blob/master/rooms/Stage.lua`.

# Stage.lua Shader & Effect Architecture Analysis

## 1. Shader Application Method

Shaders are applied sequentially through the `love.graphics.setShader()` function. The pipeline uses:

- `shaders.rgb_shift` - Applies color channel displacement
- `shaders.displacement` - Uses a shockwave canvas as a displacement map
- `shaders.glitch` - References a glitch_map for distortion effects
- `shaders.rgb` - Final RGB color mapping
- `shaders.distort` - Optional expensive shader with time-based distortion

## 2. Effect Chaining Architecture

Effects are composed through **sequential canvas rendering**:

```
rgb_shift_canvas → temp_canvas (with displacement) → 
temp_canvas_2 (with glitch) → temp_canvas_3 (second rgb_shift) → 
final_canvas (conditional rgb shader) → screen (with distort)
```

Each canvas layer outputs to the next, enabling effect stacking without recalculation.

## 3. Draw Function Pipeline

The `Stage:draw()` function implements a **multi-pass rendering system**:

- **Pass 1**: Render specialized layers (shockwave, glitch, rgb_shift, rgb) to separate canvases
- **Pass 2**: Composite main gameplay to `main_canvas`
- **Pass 3-6**: Apply sequential shader transformations across temporary canvases
... [13 more lines]

File created successfully at: E:\a327ex\Anchor\reference\phase-4-effects-analysis.md

Command running in background with ID: bda7542. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex-Anchor\tasks\bda7542.output

1→# Phase 4: Effects System Analysis
     2→
     3→A comprehensive analysis of shader/effect requirements for Anchor, based on examination of Super Emoji Box, BYTEPATH, and general 2D game effect patterns.
     4→
     5→---
     6→
     7→## Table of Contents
     8→
     9→1. [Usage Analysis: Super Emoji Box](#usage-analysis-super-emoji-box)
    10→2. [Usage Analysis: BYTEPATH](#usage-analysis-bytepath)
    11→3. [Effect Categories](#effect-categories)
    12→4. [Per-Layer vs Per-Object Effects](#per-layer-vs-per-object-effects)
    13→5. [Implementation Options](#implementation-options)
    14→6. [Recommended Architecture](#recommended-architecture)
    15→7. [Lua/YueScript API Design](#luayuescript-api-design)
    16→8. [C-Side Requirements](#c-side-requirements)
    17→9. [Open Questions](#open-questions)
    18→
    19→---
    20→
    21→## Usage Analysis: Super Emoji Box
    22→
    23→Super Emoji Box uses a **simple, layer-based effect system** with three shaders:
    24→
    25→### Shaders Used
    26→
    27→| Shader | Purpose | Application |
    28→|--------|---------|-------------|
    29→| `outline.frag` | Black silhouette behind objects | Per-layer, stored in 'outline' canvas |
    30→| `shadow.frag` | Dark drop shadow (offset) | Per-layer, applied to game+effects layers |
... [684 more lines]

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     1→# Phase 4: Effects System Analysis
     2→
     3→A comprehensive analysis of shader/effect requirements for Anchor, based on examination of Super Emoji Box, BYTEPATH, and general 2D game effect patterns.
     4→
     5→---
     6→
     7→## Table of Contents
     8→
     9→1. [Usage Analysis: Super Emoji Box](#usage-analysis-super-emoji-box)
    10→2. [Usage Analysis: BYTEPATH](#usage-analysis-bytepath)
    11→3. [Effect Categories](#effect-categories)
    12→4. [Per-Layer vs Per-Object Effects](#per-layer-vs-per-object-effects)
    13→5. [Implementation Options](#implementation-options)
    14→6. [Recommended Architecture](#recommended-architecture)
    15→7. [Lua API Design](#lua-api-design)
    16→8. [C-Side Requirements](#c-side-requirements)
    17→9. [Open Questions](#open-questions)
    18→
    19→---
    20→
    21→## Usage Analysis: Super Emoji Box
    22→
    23→Super Emoji Box uses a **simple, layer-based effect system** with three shaders:
    24→
    25→### Shaders Used
    26→
    27→| Shader | Purpose | Application |
    28→|--------|---------|-------------|
    29→| `outline.frag` | Black silhouette behind objects | Per-layer, stored in 'outline' canvas |
... [657 more lines]

1→# Anchor Implementation Plan
     2→
     3→C engine with YueScript scripting, OpenGL rendering, targeting Windows and Web.
     4→
     5→---
     6→
     7→## Summary of Key Decisions
     8→
     9→| Area | Decision | Rationale |
    10→|------|----------|-----------|
    11→| Renderer | OpenGL | Smooth rotation, additive blending, performance headroom, console-portable |
    12→| Audio | TBD (miniaudio or SoLoud) | Need pitch shifting; SDL_mixer insufficient |
    13→| Physics | Box2D 3.1 | Already used, true ball-to-ball collisions needed |
    14→| Scripting | Lua 5.4 + YueScript | Build-time compilation with `-r` flag for line numbers |
    15→| Timestep | Fixed 120Hz physics, 60Hz render | Decoupled for pixel-perfect visuals with responsive input |
    16→| Resolution | Per-game configurable | 480×270, 640×360, or custom; aspect-ratio scaling with letterboxing |
    17→| C Structure | Single anchor.c | Monolithic file, easier navigation |
    18→| Resources | Live forever | Games are small enough; no unloading needed |
    19→| Linking | Static | No DLLs; SDL2, Lua, audio all compiled in |
    20→| Distribution | Single executable | Zip-append for game content, extractable by modders |
    21→
    22→---
    23→
    24→## Build Strategy
    25→
    26→### YueScript Compilation
    27→
    28→**Build-time compilation** — compile `.yue` → `.lua` during build, not at runtime.
    29→
    30→```
... [775 more lines]

The file E:\a327ex\Anchor\reference\phase-4-effects-analysis.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→# Phase 4: Effects System Analysis
     2→
     3→A comprehensive analysis of shader/effect requirements for Anchor, based on examination of Super Emoji Box, BYTEPATH, and general 2D game effect patterns.
     4→
     5→---
     6→
     7→## Table of Contents
     8→
     9→1. [Usage Analysis: Super Emoji Box](#usage-analysis-super-emoji-box)
    10→2. [Usage Analysis: BYTEPATH](#usage-analysis-bytepath)
    11→3. [Effect Categories](#effect-categories)
    12→4. [Per-Layer vs Per-Object Effects](#per-layer-vs-per-object-effects)
    13→5. [Recommended Architecture](#recommended-architecture)
    14→6. [Ping-Pong Buffer System](#ping-pong-buffer-system)
    15→7. [Per-Object Flash via Vertex Attributes](#per-object-flash-via-vertex-attributes)
    16→8. [Lua API](#lua-api)
    17→9. [C-Side Requirements](#c-side-requirements)
    18→10. [Phase 4 Scope](#phase-4-scope)
    19→
    20→---
    21→
    22→## Usage Analysis: Super Emoji Box
    23→
    24→Super Emoji Box uses a **simple, layer-based effect system** with three shaders:
    25→
    26→### Shaders Used
    27→
    28→| Shader | Purpose | Application |
    29→|--------|---------|-------------|
... [444 more lines]

The file E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   342→**Deliverable:** Working layer system with deferred rendering, basic shapes (circle, rectangle), sprites, transforms, blend modes, and rock-solid frame timing. ✓ Complete
   343→
   344→---
   345→
   346→## Phase 4: Effects (Shaders)
   347→
   348→**Goal:** Post-processing effects on layers and per-object flash effect.
   349→
   350→See `reference/phase-4-effects-analysis.md` for full technical analysis.
   351→
   352→### Architecture Overview
   353→
   354→**Lua-controlled pipeline:** C provides shader primitives, Lua orchestrates the rendering pipeline.
   355→
   356→**Ping-pong buffer system:** Each layer has two textures (`color_texture` and `effect_texture`). When `layer_apply_shader()` is called, it renders from one to the other and swaps. This allows effect chaining.
   357→
   358→**Per-object flash via vertex attributes:** Instead of shader swapping (which breaks batching), flash color is passed as a per-vertex attribute. 50 flashing objects = 1 batched draw call.
   359→
   360→---
   361→
   362→### Implementation Steps
   363→
   364→**Step 1: Shader loading infrastructure**
   365→- [ ] `shader_load_file(path)` — load fragment shader from file, pair with screen vertex shader
   366→- [ ] `shader_load_string(source)` — load fragment shader from string
   367→- [ ] `shader_destroy(shader)` — cleanup
   368→- [ ] Auto-prepend platform headers (`#version 330 core` / `#version 300 es`)
   369→- [ ] Lua bindings for above
   370→
... [75 more lines]

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   779→|-------|-------|-----------------|
   780→| 1 | C Skeleton | OpenGL window + Lua + error handling |
   781→| 2 | Web Build | Emscripten/WebGL parity |
   782→| 3 | Rendering | Shapes, sprites, layers, blend modes |
   783→| 4 | Effects | Post-process shaders (outline, shadow) + per-object flash |
   784→| 5 | Input | Keyboard/mouse with action bindings (runtime rebindable) |
   785→| 6 | Audio | Sound/music with pitch shifting |
   786→| 7 | Physics | Box2D 3.1 with events and queries |
   787→| 8 | Random | Seedable PRNG with replay support |

1→# Anchor Engine Specification
     2→
     3→*Anchor is a 2D game engine built around locality of behavior and minimal cognitive overhead. Code that belongs together stays together.*
     4→
     5→---
     6→
     7→## Table of Contents
     8→
     9→1. [Core Philosophy](#core-philosophy)
    10→2. [The Object Tree](#the-object-tree)
    11→3. [Lifecycle](#lifecycle)
    12→4. [Colliders, Springs, and Timers](#colliders-springs-and-timers)
    13→5. [Locality of Behavior](#locality-of-behavior)
    14→6. [Drawing](#drawing)
    15→7. [Lua Syntax Features](#lua-syntax-features)
    16→8. [YueScript Alternative](#yuescript-alternative)
    17→9. [YueScript Class System Integration](#yuescript-class-system-integration)
    18→10. [Technology Stack](#technology-stack)
    19→11. [Rendering](#rendering)
    20→12. [Error Handling](#error-handling)
    21→13. [Build and Distribution](#build-and-distribution)
    22→14. [File Structure](#file-structure)
    23→15. [Performance Path](#performance-path)
    24→16. [Deferred Features](#deferred-features)
    25→
    26→---
    27→
    28→## Core Philosophy
    29→
    30→### Locality of Behavior
... [1452 more lines]

The file E:\a327ex\Anchor\docs\ANCHOR.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1332→layer:set_blend_mode('alpha')     -- default (standard transparency)
  1333→layer:set_blend_mode('additive')  -- for glows, explosions, energy effects
  1334→```
  1335→
  1336→### Effects
  1337→
  1338→Effects are fragment shaders applied to layer framebuffers. Shaders are loaded from files and controlled from Lua — there are no built-in effects in C.
  1339→
  1340→**Layer effects (post-processing):**
  1341→
  1342→Each layer has a ping-pong buffer system. When `layer_apply_shader()` is called, it renders the layer's current texture to a second buffer using the shader, then swaps which buffer is "current". This allows effect chaining.
  1343→
  1344→```lua
  1345→-- Load shaders from files
  1346→local outline_shader = shader_load_file('shaders/outline.frag')
  1347→local shadow_shader = shader_load_file('shaders/shadow.frag')
  1348→
  1349→-- Set uniforms before applying
  1350→shader_set_vec2(outline_shader, 'pixel_size', 1/480, 1/270)
  1351→
  1352→-- Apply to layer (ping-pong)
  1353→layer_apply_shader(game, outline_shader)
  1354→
  1355→-- Chain multiple effects
  1356→layer_apply_shader(game, effect1)
  1357→layer_apply_shader(game, effect2)
  1358→
  1359→-- Get layer texture (for use as input to another shader)
  1360→local tex = layer_get_texture(shockwave)
... [25 more lines]

1→/*
     2→ * Anchor Engine
     3→ * Phase 1: Window + OpenGL + Lua integration
     4→ * Phase 2: Web build (Emscripten/WebGL)
     5→ * Phase 3: Rendering (layers, shapes, sprites, transforms, blend modes)
     6→ */
     7→
     8→#include <stdio.h>
     9→#include <stdlib.h>
    10→#include <stdbool.h>
    11→#include <string.h>
    12→#include <math.h>
    13→
    14→#ifdef _WIN32
    15→#include <direct.h>  // _chdir
    16→#else
    17→#include <unistd.h>  // chdir
    18→#endif
    19→
    20→#include <SDL.h>
    21→
    22→#ifdef __EMSCRIPTEN__
    23→    #include <emscripten.h>
    24→    #include <emscripten/html5.h>
    25→    #include <GLES3/gl3.h>
    26→#else
    27→    #include <glad/gl.h>
    28→#endif
    29→
    30→#include <lua.h>
... [1503 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   470→static Layer* layer_registry[MAX_LAYERS];
   471→static char* layer_names[MAX_LAYERS];
   472→static int layer_count = 0;
   473→
   474→// Screen blit resources
   475→static GLuint screen_shader = 0;
   476→static GLuint screen_vao = 0;
   477→static GLuint screen_vbo = 0;
   478→
   479→// Effect shader loading
   480→// Effect shaders use the screen vertex shader (simple pass-through with TexCoord)
   481→// and a custom fragment shader provided by the user.
   482→
   483→// Load effect shader from fragment source string
   484→// Returns shader program ID, or 0 on failure
   485→static GLuint effect_shader_load_string(const char* frag_source) {
   486→    // Use the same vertex shader as screen blit
   487→    return create_shader_program(screen_vertex_source, frag_source);
   488→}
   489→
   490→// Read entire file into malloc'd string (caller must free)
   491→static char* read_file_to_string(const char* path) {
   492→    FILE* f = fopen(path, "rb");
   493→    if (!f) {
   494→        fprintf(stderr, "Failed to open file: %s\n", path);
   495→        return NULL;
   496→    }
   497→
   498→    fseek(f, 0, SEEK_END);
... [64 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   470→static Layer* layer_registry[MAX_LAYERS];
   471→static char* layer_names[MAX_LAYERS];
   472→static int layer_count = 0;
   473→
   474→// Screen blit resources
   475→static GLuint screen_shader = 0;
   476→static GLuint screen_vao = 0;
   477→static GLuint screen_vbo = 0;
   478→
   479→// Flush batch to GPU
   480→static void batch_flush(void) {
   481→    if (batch_vertex_count == 0) return;

1057:static GLuint create_shader_program(const char* vert_src, const char* frag_src) {

1050→        glDeleteShader(shader);
  1051→        return 0;
  1052→    }
  1053→    return shader;
  1054→}
  1055→
  1056→// Link shaders into a program and return its ID (0 on failure)
  1057→static GLuint create_shader_program(const char* vert_src, const char* frag_src) {
  1058→    GLuint vert = compile_shader(GL_VERTEX_SHADER, vert_src);
  1059→    if (!vert) return 0;
  1060→
  1061→    GLuint frag = compile_shader(GL_FRAGMENT_SHADER, frag_src);
  1062→    if (!frag) {
  1063→        glDeleteShader(vert);
  1064→        return 0;
  1065→    }
  1066→
  1067→    GLuint program = glCreateProgram();
  1068→    glAttachShader(program, vert);
  1069→    glAttachShader(program, frag);
  1070→    glLinkProgram(program);
  1071→
  1072→    // Shaders can be deleted after linking
  1073→    glDeleteShader(vert);
  1074→    glDeleteShader(frag);
  1075→
  1076→    GLint success;
  1077→    glGetProgramiv(program, GL_LINK_STATUS, &success);
  1078→    if (!success) {
  1079→        char info_log[512];
... [30 more lines]

1050→        glDeleteShader(shader);
  1051→        return 0;
  1052→    }
  1053→    return shader;
  1054→}
  1055→
  1056→// Link shaders into a program and return its ID (0 on failure)
  1057→static GLuint create_shader_program(const char* vert_src, const char* frag_src) {
  1058→    GLuint vert = compile_shader(GL_VERTEX_SHADER, vert_src);
  1059→    if (!vert) return 0;
  1060→
  1061→    GLuint frag = compile_shader(GL_FRAGMENT_SHADER, frag_src);
  1062→    if (!frag) {
  1063→        glDeleteShader(vert);
  1064→        return 0;
  1065→    }
  1066→
  1067→    GLuint program = glCreateProgram();
  1068→    glAttachShader(program, vert);
  1069→    glAttachShader(program, frag);
  1070→    glLinkProgram(program);
  1071→
  1072→    // Shaders can be deleted after linking
  1073→    glDeleteShader(vert);
  1074→    glDeleteShader(frag);
  1075→
  1076→    GLint success;
  1077→    glGetProgramiv(program, GL_LINK_STATUS, &success);
  1078→    if (!success) {
  1079→        char info_log[512];
... [70 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1081→        fprintf(stderr, "Shader program linking failed: %s\n", info_log);
  1082→        glDeleteProgram(program);
  1083→        return 0;
  1084→    }
  1085→    return program;
  1086→}
  1087→
  1088→// Effect shader loading
  1089→// Read entire file into malloc'd string (caller must free)
  1090→static char* read_file_to_string(const char* path) {
  1091→    FILE* f = fopen(path, "rb");
  1092→    if (!f) {
  1093→        fprintf(stderr, "Failed to open file: %s\n", path);
  1094→        return NULL;
  1095→    }
  1096→    fseek(f, 0, SEEK_END);
  1097→    long size = ftell(f);
  1098→    fseek(f, 0, SEEK_SET);
  1099→    char* buffer = (char*)malloc(size + 1);
  1100→    if (!buffer) {
  1101→        fclose(f);
  1102→        return NULL;
  1103→    }
  1104→    size_t read_size = fread(buffer, 1, size, f);
  1105→    buffer[read_size] = '\0';
  1106→    fclose(f);
  1107→    return buffer;
  1108→}
  1109→
... [62 more lines]

854:    lua_register(L, "layer_create", l_layer_create);
855:    lua_register(L, "layer_rectangle", l_layer_rectangle);
856:    lua_register(L, "layer_circle", l_layer_circle);
857:    lua_register(L, "layer_push", l_layer_push);
858:    lua_register(L, "layer_pop", l_layer_pop);
859:    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
860:    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
861:    lua_register(L, "texture_load", l_texture_load);
862:    lua_register(L, "texture_get_width", l_texture_get_width);
863:    lua_register(L, "texture_get_height", l_texture_get_height);
864:    lua_register(L, "rgba", l_rgba);
865:    lua_register(L, "set_shape_filter", l_set_shape_filter);
866:    lua_register(L, "timing_resync", l_timing_resync);

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750→
   751→static int l_layer_circle(lua_State* L) {
   752→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   753→    float x = (float)luaL_checknumber(L, 2);
   754→    float y = (float)luaL_checknumber(L, 3);
   755→    float radius = (float)luaL_checknumber(L, 4);
   756→    uint32_t color = (uint32_t)luaL_checkinteger(L, 5);
   757→    layer_add_circle(layer, x, y, radius, color);
   758→    return 0;
   759→}
   760→
   761→static int l_rgba(lua_State* L) {
   762→    int r = (int)luaL_checkinteger(L, 1);
   763→    int g = (int)luaL_checkinteger(L, 2);
   764→    int b = (int)luaL_checkinteger(L, 3);
   765→    int a = (int)luaL_optinteger(L, 4, 255);
   766→    uint32_t color = ((r & 0xFF) << 24) | ((g & 0xFF) << 16) | ((b & 0xFF) << 8) | (a & 0xFF);
   767→    lua_pushinteger(L, color);
   768→    return 1;
   769→}
   770→
   771→static int l_set_shape_filter(lua_State* L) {
   772→    const char* mode = luaL_checkstring(L, 1);
   773→    if (strcmp(mode, "smooth") == 0) {
   774→        shape_filter_mode = FILTER_SMOOTH;
   775→    } else if (strcmp(mode, "rough") == 0) {
   776→        shape_filter_mode = FILTER_ROUGH;
   777→    } else {
   778→        return luaL_error(L, "Invalid filter mode: %s (use 'smooth' or 'rough')", mode);
   779→    }
... [100 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   849→    }
   850→    return 0;
   851→}
   852→
   853→// Effect shader Lua bindings
   854→static int l_shader_load_file(lua_State* L) {
   855→    const char* path = luaL_checkstring(L, 1);
   856→    GLuint shader = effect_shader_load_file(path);
   857→    if (!shader) {
   858→        return luaL_error(L, "Failed to load effect shader: %s", path);
   859→    }
   860→    lua_pushinteger(L, (lua_Integer)shader);
   861→    return 1;
   862→}
   863→
   864→static int l_shader_load_string(lua_State* L) {
   865→    const char* source = luaL_checkstring(L, 1);
   866→    GLuint shader = effect_shader_load_string(source);
   867→    if (!shader) {
   868→        return luaL_error(L, "Failed to compile effect shader from string");
   869→    }
   870→    lua_pushinteger(L, (lua_Integer)shader);
   871→    return 1;
   872→}
   873→
   874→static int l_shader_destroy(lua_State* L) {
   875→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
   876→    effect_shader_destroy(shader);
   877→    return 0;
... [75 more lines]

Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

100→// Verify DrawCommand is exactly 64 bytes (compile-time check)
   101→#ifdef _MSC_VER
   102→    static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   103→#else
   104→    _Static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   105→#endif
   106→
   107→// Layer
   108→typedef struct {
   109→    GLuint fbo;
   110→    GLuint color_texture;
   111→    int width;
   112→    int height;
   113→
   114→    // Transform stack (mat3 stored as 9 floats: row-major)
   115→    // Each mat3: [m00 m01 m02 m10 m11 m12 m20 m21 m22]
   116→    // Represents 2D affine transform (2x3 used, bottom row is 0,0,1)
   117→    float transform_stack[MAX_TRANSFORM_DEPTH * 9];
   118→    int transform_depth;
   119→
   120→    // Command queue (deferred rendering)
   121→    DrawCommand* commands;
   122→    int command_count;
   123→    int command_capacity;
   124→
   125→    // Current state
   126→    uint8_t current_blend;
   127→} Layer;
   128→
   129→// Texture
... [50 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   103→#else
   104→    _Static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   105→#endif
   106→
   107→// Layer
   108→typedef struct {
   109→    GLuint fbo;
   110→    GLuint color_texture;
   111→    int width;
   112→    int height;
   113→
   114→    // Effect ping-pong buffers (created on first use)
   115→    GLuint effect_fbo;
   116→    GLuint effect_texture;
   117→    bool textures_swapped;  // Which buffer is current result
   118→
   119→    // Transform stack (mat3 stored as 9 floats: row-major)
   120→    // Each mat3: [m00 m01 m02 m10 m11 m12 m20 m21 m22]
   121→    // Represents 2D affine transform (2x3 used, bottom row is 0,0,1)
   122→    float transform_stack[MAX_TRANSFORM_DEPTH * 9];
   123→    int transform_depth;
   124→
   125→    // Command queue (deferred rendering)
   126→    DrawCommand* commands;
   127→    int command_count;
   128→    int command_capacity;
   129→
   130→    // Current state
   131→    uint8_t current_blend;
... [5 more lines]

233:static void layer_destroy(Layer* layer) {

230→    return layer;
   231→}
   232→
   233→static void layer_destroy(Layer* layer) {
   234→    if (!layer) return;
   235→    if (layer->commands) free(layer->commands);
   236→    if (layer->color_texture) glDeleteTextures(1, &layer->color_texture);
   237→    if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
   238→    free(layer);
   239→}
   240→
   241→// Get pointer to current transform (mat3 at current depth)
   242→static float* layer_get_transform(Layer* layer) {
   243→    return &layer->transform_stack[layer->transform_depth * 9];
   244→}
   245→
   246→// Copy current transform to a 2x3 array (for DrawCommand)
   247→static void layer_copy_transform(Layer* layer, float* dest) {
   248→    float* src = layer_get_transform(layer);
   249→    // Copy first two rows (6 floats) - third row is always [0, 0, 1]
   250→    dest[0] = src[0]; dest[1] = src[1]; dest[2] = src[2];
   251→    dest[3] = src[3]; dest[4] = src[4]; dest[5] = src[5];
   252→}
   253→
   254→// Add a command to the layer's queue (returns pointer to the new command)
   255→// Returns NULL if queue is full (MAX_COMMAND_CAPACITY reached)
   256→static DrawCommand* layer_add_command(Layer* layer) {
   257→    if (layer->command_count >= layer->command_capacity) {
   258→        // Fixed size queue - don't grow, just drop the command
   259→        // This should never happen in normal use (16384 commands per frame is huge)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   229→    glBindFramebuffer(GL_FRAMEBUFFER, 0);
   230→    return layer;
   231→}
   232→
   233→static void layer_destroy(Layer* layer) {
   234→    if (!layer) return;
   235→    if (layer->commands) free(layer->commands);
   236→    if (layer->color_texture) glDeleteTextures(1, &layer->color_texture);
   237→    if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
   238→    // Effect ping-pong buffers
   239→    if (layer->effect_texture) glDeleteTextures(1, &layer->effect_texture);
   240→    if (layer->effect_fbo) glDeleteFramebuffers(1, &layer->effect_fbo);
   241→    free(layer);
   242→}
   243→
   244→// Get pointer to current transform (mat3 at current depth)
   245→static float* layer_get_transform(Layer* layer) {
   246→    return &layer->transform_stack[layer->transform_depth * 9];

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   229→    glBindFramebuffer(GL_FRAMEBUFFER, 0);
   230→    return layer;
   231→}
   232→
   233→static void layer_destroy(Layer* layer) {
   234→    if (!layer) return;
   235→    if (layer->commands) free(layer->commands);
   236→    if (layer->color_texture) glDeleteTextures(1, &layer->color_texture);
   237→    if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
   238→    // Effect ping-pong buffers
   239→    if (layer->effect_texture) glDeleteTextures(1, &layer->effect_texture);
   240→    if (layer->effect_fbo) glDeleteFramebuffers(1, &layer->effect_fbo);
   241→    free(layer);
   242→}
   243→
   244→// Ensure effect buffer exists (lazy creation)
   245→static void layer_ensure_effect_buffer(Layer* layer) {
   246→    if (layer->effect_fbo != 0) return;  // Already created
   247→
   248→    // Create effect texture
   249→    glGenTextures(1, &layer->effect_texture);
   250→    glBindTexture(GL_TEXTURE_2D, layer->effect_texture);
   251→    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, layer->width, layer->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
   252→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   253→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   254→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   255→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   256→
   257→    // Create effect FBO
... [28 more lines]

521:static GLuint screen_vao = 0;
522:static GLuint screen_vbo = 0;
1314:    if (screen_vbo) { glDeleteBuffers(1, &screen_vbo); screen_vbo = 0; }
1315:    if (screen_vao) { glDeleteVertexArrays(1, &screen_vao); screen_vao = 0; }
1497:            glBindVertexArray(screen_vao);
1653:    glGenVertexArrays(1, &screen_vao);
1654:    glGenBuffers(1, &screen_vbo);
1656:    glBindVertexArray(screen_vao);
1657:    glBindBuffer(GL_ARRAY_BUFFER, screen_vbo);

[Showing results with pagination = limit: 20, offset: 0]

1485→        glClear(GL_COLOR_BUFFER_BIT);
  1486→
  1487→        // Set viewport for game area
  1488→        glViewport(offset_x, offset_y, scaled_w, scaled_h);
  1489→        glUseProgram(screen_shader);
  1490→
  1491→        // Blit each layer in order (first created = bottom)
  1492→        for (int i = 0; i < layer_count; i++) {
  1493→            Layer* layer = layer_registry[i];
  1494→            glActiveTexture(GL_TEXTURE0);
  1495→            glBindTexture(GL_TEXTURE_2D, layer->color_texture);
  1496→
  1497→            glBindVertexArray(screen_vao);
  1498→            glDrawArrays(GL_TRIANGLES, 0, 6);
  1499→            glBindVertexArray(0);
  1500→        }
  1501→
  1502→        SDL_GL_SwapWindow(window);
  1503→    }
  1504→
  1505→    #ifdef __EMSCRIPTEN__
  1506→    if (!running) {
  1507→        emscripten_cancel_main_loop();
  1508→        shutdown();
  1509→    }
  1510→    #endif
  1511→}
  1512→
  1513→int main(int argc, char* argv[]) {
  1514→    printf("Anchor Engine starting...\n");
... [30 more lines]

515→static Layer* layer_registry[MAX_LAYERS];
   516→static char* layer_names[MAX_LAYERS];
   517→static int layer_count = 0;
   518→
   519→// Screen blit resources
   520→static GLuint screen_shader = 0;
   521→static GLuint screen_vao = 0;
   522→static GLuint screen_vbo = 0;
   523→
   524→// Flush batch to GPU
   525→static void batch_flush(void) {
   526→    if (batch_vertex_count == 0) return;
   527→
   528→    // Bind texture if we have one (for sprites)
   529→    if (current_batch_texture != 0) {
   530→        glActiveTexture(GL_TEXTURE0);
   531→        glBindTexture(GL_TEXTURE_2D, current_batch_texture);
   532→    }
   533→
   534→    glBindVertexArray(vao);
   535→    glBindBuffer(GL_ARRAY_BUFFER, vbo);
   536→    glBufferSubData(GL_ARRAY_BUFFER, 0,
   537→                    batch_vertex_count * VERTEX_FLOATS * sizeof(float),
   538→                    batch_vertices);
   539→    glDrawArrays(GL_TRIANGLES, 0, batch_vertex_count);
   540→    glBindVertexArray(0);
   541→
   542→    batch_vertex_count = 0;
   543→}
   544→
... [30 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   515→static Layer* layer_registry[MAX_LAYERS];
   516→static char* layer_names[MAX_LAYERS];
   517→static int layer_count = 0;
   518→
   519→// Screen blit resources
   520→static GLuint screen_shader = 0;
   521→static GLuint screen_vao = 0;
   522→static GLuint screen_vbo = 0;
   523→
   524→// Apply a shader to a layer (ping-pong)
   525→// Renders current result through shader to alternate buffer, then swaps
   526→static void layer_apply_shader(Layer* layer, GLuint shader) {
   527→    if (!shader) return;
   528→
   529→    // Ensure effect buffer exists
   530→    layer_ensure_effect_buffer(layer);
   531→
   532→    // Determine source and destination based on current state
   533→    GLuint src_tex, dst_fbo;
   534→    if (layer->textures_swapped) {
   535→        // Current result is in effect_texture, render to color_texture
   536→        src_tex = layer->effect_texture;
   537→        dst_fbo = layer->fbo;
   538→    } else {
   539→        // Current result is in color_texture, render to effect_texture
   540→        src_tex = layer->color_texture;
   541→        dst_fbo = layer->effect_fbo;
   542→    }
   543→
... [42 more lines]

990→static int l_shader_set_vec2(lua_State* L) {
   991→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
   992→    const char* name = luaL_checkstring(L, 2);
   993→    float x = (float)luaL_checknumber(L, 3);
   994→    float y = (float)luaL_checknumber(L, 4);
   995→    shader_set_vec2(shader, name, x, y);
   996→    return 0;
   997→}
   998→
   999→static int l_shader_set_vec4(lua_State* L) {
  1000→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1001→    const char* name = luaL_checkstring(L, 2);
  1002→    float x = (float)luaL_checknumber(L, 3);
  1003→    float y = (float)luaL_checknumber(L, 4);
  1004→    float z = (float)luaL_checknumber(L, 5);
  1005→    float w = (float)luaL_checknumber(L, 6);
  1006→    shader_set_vec4(shader, name, x, y, z, w);
  1007→    return 0;
  1008→}
  1009→
  1010→static int l_shader_set_int(lua_State* L) {
  1011→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1012→    const char* name = luaL_checkstring(L, 2);
  1013→    int value = (int)luaL_checkinteger(L, 3);
  1014→    shader_set_int(shader, name, value);
  1015→    return 0;
  1016→}
  1017→
  1018→static int l_shader_set_texture(lua_State* L) {
  1019→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
... [20 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1014→    shader_set_int(shader, name, value);
  1015→    return 0;
  1016→}
  1017→
  1018→static int l_shader_set_texture(lua_State* L) {
  1019→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1020→    const char* name = luaL_checkstring(L, 2);
  1021→    GLuint texture = (GLuint)luaL_checkinteger(L, 3);
  1022→    int unit = (int)luaL_checkinteger(L, 4);
  1023→    shader_set_texture(shader, name, texture, unit);
  1024→    return 0;
  1025→}
  1026→
  1027→// Layer effect Lua bindings
  1028→static int l_layer_apply_shader(lua_State* L) {
  1029→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1030→    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
  1031→    layer_apply_shader(layer, shader);
  1032→    return 0;
  1033→}
  1034→
  1035→static int l_layer_get_texture(lua_State* L) {
  1036→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1037→    GLuint tex = layer_get_texture(layer);
  1038→    lua_pushinteger(L, (lua_Integer)tex);
  1039→    return 1;
  1040→}
  1041→
  1042→static int l_layer_reset_effects(lua_State* L) {
... [10 more lines]

1055→    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
  1056→    lua_register(L, "texture_load", l_texture_load);
  1057→    lua_register(L, "texture_get_width", l_texture_get_width);
  1058→    lua_register(L, "texture_get_height", l_texture_get_height);
  1059→    lua_register(L, "rgba", l_rgba);
  1060→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  1061→    lua_register(L, "timing_resync", l_timing_resync);
  1062→    // Effect shaders
  1063→    lua_register(L, "shader_load_file", l_shader_load_file);
  1064→    lua_register(L, "shader_load_string", l_shader_load_string);
  1065→    lua_register(L, "shader_destroy", l_shader_destroy);
  1066→    lua_register(L, "shader_set_float", l_shader_set_float);
  1067→    lua_register(L, "shader_set_vec2", l_shader_set_vec2);
  1068→    lua_register(L, "shader_set_vec4", l_shader_set_vec4);
  1069→    lua_register(L, "shader_set_int", l_shader_set_int);
  1070→    lua_register(L, "shader_set_texture", l_shader_set_texture);
  1071→}
  1072→
  1073→// Main loop state (needed for emscripten)
  1074→static bool running = true;
  1075→static Uint64 perf_freq = 0;
  1076→static Uint64 last_time = 0;
  1077→static double physics_lag = 0.0;
  1078→static double render_lag = 0.0;
  1079→static Uint64 step = 0;
  1080→static double game_time = 0.0;
  1081→static Uint64 frame = 0;
  1082→
  1083→// VSync snap frequencies (computed at init based on display refresh rate)
  1084→static double snap_frequencies[8];

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1058→    lua_register(L, "texture_get_height", l_texture_get_height);
  1059→    lua_register(L, "rgba", l_rgba);
  1060→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  1061→    lua_register(L, "timing_resync", l_timing_resync);
  1062→    // Effect shaders
  1063→    lua_register(L, "shader_load_file", l_shader_load_file);
  1064→    lua_register(L, "shader_load_string", l_shader_load_string);
  1065→    lua_register(L, "shader_destroy", l_shader_destroy);
  1066→    lua_register(L, "shader_set_float", l_shader_set_float);
  1067→    lua_register(L, "shader_set_vec2", l_shader_set_vec2);
  1068→    lua_register(L, "shader_set_vec4", l_shader_set_vec4);
  1069→    lua_register(L, "shader_set_int", l_shader_set_int);
  1070→    lua_register(L, "shader_set_texture", l_shader_set_texture);
  1071→    // Layer effects
  1072→    lua_register(L, "layer_apply_shader", l_layer_apply_shader);
  1073→    lua_register(L, "layer_get_texture", l_layer_get_texture);
  1074→    lua_register(L, "layer_reset_effects", l_layer_reset_effects);
  1075→}
  1076→
  1077→// Main loop state (needed for emscripten)
  1078→static bool running = true;
  1079→static Uint64 perf_freq = 0;

1580→            glDrawArrays(GL_TRIANGLES, 0, 6);
  1581→            glBindVertexArray(0);
  1582→        }
  1583→
  1584→        SDL_GL_SwapWindow(window);
  1585→    }
  1586→
  1587→    #ifdef __EMSCRIPTEN__
  1588→    if (!running) {
  1589→        emscripten_cancel_main_loop();
  1590→        shutdown();
  1591→    }
  1592→    #endif
  1593→}
  1594→
  1595→int main(int argc, char* argv[]) {
  1596→    printf("Anchor Engine starting...\n");
  1597→
  1598→    // Change working directory to game folder (passed as argument, like LÖVE)
  1599→    if (argc > 1) {
  1600→        const char* game_folder = argv[1];
  1601→        #ifdef _WIN32
  1602→        _chdir(game_folder);
  1603→        #else
  1604→        chdir(game_folder);
  1605→        #endif
  1606→        printf("Game folder: %s\n", game_folder);
  1607→    }
  1608→
  1609→    printf("Loading: main.lua\n");
... [20 more lines]

1555→        int int_scale = (int)scale;
  1556→        if (int_scale < 1) int_scale = 1;
  1557→
  1558→        // Calculate centered position with letterboxing
  1559→        int scaled_w = GAME_WIDTH * int_scale;
  1560→        int scaled_h = GAME_HEIGHT * int_scale;
  1561→        int offset_x = (window_w - scaled_w) / 2;
  1562→        int offset_y = (window_h - scaled_h) / 2;
  1563→
  1564→        // Clear screen to black (letterbox color)
  1565→        glViewport(0, 0, window_w, window_h);
  1566→        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  1567→        glClear(GL_COLOR_BUFFER_BIT);
  1568→
  1569→        // Set viewport for game area
  1570→        glViewport(offset_x, offset_y, scaled_w, scaled_h);
  1571→        glUseProgram(screen_shader);
  1572→
  1573→        // Blit each layer in order (first created = bottom)
  1574→        for (int i = 0; i < layer_count; i++) {
  1575→            Layer* layer = layer_registry[i];
  1576→            glActiveTexture(GL_TEXTURE0);
  1577→            glBindTexture(GL_TEXTURE_2D, layer->color_texture);
  1578→
  1579→            glBindVertexArray(screen_vao);
  1580→            glDrawArrays(GL_TRIANGLES, 0, 6);
  1581→            glBindVertexArray(0);
  1582→        }
  1583→
  1584→        SDL_GL_SwapWindow(window);
... [10 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1569→        // Set viewport for game area
  1570→        glViewport(offset_x, offset_y, scaled_w, scaled_h);
  1571→        glUseProgram(screen_shader);
  1572→
  1573→        // Blit each layer in order (first created = bottom)
  1574→        for (int i = 0; i < layer_count; i++) {
  1575→            Layer* layer = layer_registry[i];
  1576→            glActiveTexture(GL_TEXTURE0);
  1577→            // Use layer_get_texture to get the correct buffer (accounts for effects)
  1578→            glBindTexture(GL_TEXTURE_2D, layer_get_texture(layer));
  1579→
  1580→            glBindVertexArray(screen_vao);
  1581→            glDrawArrays(GL_TRIANGLES, 0, 6);
  1582→            glBindVertexArray(0);
  1583→
  1584→            // Reset effect state for next frame
  1585→            layer_reset_effects(layer);
  1586→        }
  1587→
  1588→        SDL_GL_SwapWindow(window);
  1589→    }
  1590→
  1591→    #ifdef __EMSCRIPTEN__
  1592→    if (!running) {

Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

364:#define VERTEX_FLOATS 13         // x, y, u, v, r, g, b, a, type, shape[4]
378:static float batch_vertices[MAX_BATCH_VERTICES * VERTEX_FLOATS];
463:    int i = batch_vertex_count * VERTEX_FLOATS;
594:                    batch_vertex_count * VERTEX_FLOATS * sizeof(float),
726:    // shape params unused for sprites, but we still use the same vertex format
1690:    glBufferData(GL_ARRAY_BUFFER, MAX_BATCH_VERTICES * VERTEX_FLOATS * sizeof(float), NULL, GL_DYNAMIC_DRAW);
1693:    int stride = VERTEX_FLOATS * sizeof(float);

360→}
   361→
   362→// Batch rendering
   363→#define MAX_BATCH_VERTICES 6000  // 1000 quads * 6 vertices
   364→#define VERTEX_FLOATS 13         // x, y, u, v, r, g, b, a, type, shape[4]
   365→
   366→// Shape types for uber-shader
   367→#define SHAPE_TYPE_RECT   0.0f
   368→#define SHAPE_TYPE_CIRCLE 1.0f
   369→#define SHAPE_TYPE_SPRITE 2.0f
   370→
   371→// Shape filter mode (smooth = anti-aliased, rough = hard pixel edges)
   372→enum {
   373→    FILTER_SMOOTH = 0,
   374→    FILTER_ROUGH,
   375→};
   376→static int shape_filter_mode = FILTER_SMOOTH;
   377→
   378→static float batch_vertices[MAX_BATCH_VERTICES * VERTEX_FLOATS];
   379→static int batch_vertex_count = 0;
   380→static GLuint current_batch_texture = 0;  // Currently bound texture for batching
   381→
   382→// Transform a point by a 2x3 matrix: [m0 m1 m2] [x]   [m0*x + m1*y + m2]
   383→//                                    [m3 m4 m5] [y] = [m3*x + m4*y + m5]
   384→//                                               [1]
   385→static void transform_point(const float* m, float x, float y, float* out_x, float* out_y) {
   386→    *out_x = m[0] * x + m[1] * y + m[2];
   387→    *out_y = m[3] * x + m[4] * y + m[5];
   388→}
   389→
... [20 more lines]

1685→    glGenBuffers(1, &vbo);
  1686→
  1687→    glBindVertexArray(vao);
  1688→    glBindBuffer(GL_ARRAY_BUFFER, vbo);
  1689→    // Allocate space for batch rendering
  1690→    glBufferData(GL_ARRAY_BUFFER, MAX_BATCH_VERTICES * VERTEX_FLOATS * sizeof(float), NULL, GL_DYNAMIC_DRAW);
  1691→
  1692→    // Stride = 13 floats = 52 bytes
  1693→    int stride = VERTEX_FLOATS * sizeof(float);
  1694→
  1695→    // Position attribute (location 0): 2 floats at offset 0
  1696→    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, (void*)0);
  1697→    glEnableVertexAttribArray(0);
  1698→
  1699→    // UV attribute (location 1): 2 floats at offset 2
  1700→    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void*)(2 * sizeof(float)));
  1701→    glEnableVertexAttribArray(1);
  1702→
  1703→    // Color attribute (location 2): 4 floats at offset 4
  1704→    glVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, stride, (void*)(4 * sizeof(float)));
  1705→    glEnableVertexAttribArray(2);
  1706→
  1707→    // Type attribute (location 3): 1 float at offset 8
  1708→    glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, stride, (void*)(8 * sizeof(float)));
  1709→    glEnableVertexAttribArray(3);
  1710→
  1711→    // Shape attribute (location 4): 4 floats at offset 9
  1712→    glVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, stride, (void*)(9 * sizeof(float)));
  1713→    glEnableVertexAttribArray(4);
  1714→
... [10 more lines]

No matches found

1217:static const char* screen_vertex_source =
1226:static const char* screen_fragment_source =
1318:// Create an effect shader program from fragment source (uses screen_vertex_source)
1320:    return create_shader_program(screen_vertex_source, frag_source);
1719:    screen_shader = create_shader_program(screen_vertex_source, screen_fragment_source);

[Showing results with pagination = limit: 15, offset: 0]

967:    const char* source = luaL_checkstring(L, 1);
1109:static const char* vertex_shader_source =
1133:static const char* fragment_shader_source =
1217:static const char* screen_vertex_source =
1226:static const char* screen_fragment_source =
1236:static GLuint compile_shader(GLenum type, const char* source) {
1319:static GLuint effect_shader_load_string(const char* frag_source) {

1105→    #define SHADER_HEADER_FRAG "#version 330 core\n"
  1106→#endif
  1107→
  1108→// Shader sources (no version line - header prepended at compile time)
  1109→static const char* vertex_shader_source =
  1110→    "layout (location = 0) in vec2 aPos;\n"
  1111→    "layout (location = 1) in vec2 aUV;\n"
  1112→    "layout (location = 2) in vec4 aColor;\n"
  1113→    "layout (location = 3) in float aType;\n"
  1114→    "layout (location = 4) in vec4 aShape;\n"
  1115→    "\n"
  1116→    "out vec2 vPos;\n"
  1117→    "out vec2 vUV;\n"
  1118→    "out vec4 vColor;\n"
  1119→    "out float vType;\n"
  1120→    "out vec4 vShape;\n"
  1121→    "\n"
  1122→    "uniform mat4 projection;\n"
  1123→    "\n"
  1124→    "void main() {\n"
  1125→    "    gl_Position = projection * vec4(aPos, 0.0, 1.0);\n"
  1126→    "    vPos = aPos;\n"
  1127→    "    vUV = aUV;\n"
  1128→    "    vColor = aColor;\n"
  1129→    "    vType = aType;\n"
  1130→    "    vShape = aShape;\n"
  1131→    "}\n";
  1132→
  1133→static const char* fragment_shader_source =
  1134→    "in vec2 vPos;\n"
... [100 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   358→static void layer_set_blend_mode(Layer* layer, uint8_t mode) {
   359→    layer->current_blend = mode;
   360→}
   361→
   362→// Batch rendering
   363→#define MAX_BATCH_VERTICES 6000  // 1000 quads * 6 vertices
   364→#define VERTEX_FLOATS 16         // x, y, u, v, r, g, b, a, type, shape[4], addR, addG, addB
   365→
   366→// Shape types for uber-shader
   367→#define SHAPE_TYPE_RECT   0.0f
   368→#define SHAPE_TYPE_CIRCLE 1.0f

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1105→    #define SHADER_HEADER_FRAG "#version 330 core\n"
  1106→#endif
  1107→
  1108→// Shader sources (no version line - header prepended at compile time)
  1109→static const char* vertex_shader_source =
  1110→    "layout (location = 0) in vec2 aPos;\n"
  1111→    "layout (location = 1) in vec2 aUV;\n"
  1112→    "layout (location = 2) in vec4 aColor;\n"
  1113→    "layout (location = 3) in float aType;\n"
  1114→    "layout (location = 4) in vec4 aShape;\n"
  1115→    "layout (location = 5) in vec3 aAddColor;\n"
  1116→    "\n"
  1117→    "out vec2 vPos;\n"
  1118→    "out vec2 vUV;\n"
  1119→    "out vec4 vColor;\n"
  1120→    "out float vType;\n"
  1121→    "out vec4 vShape;\n"
  1122→    "out vec3 vAddColor;\n"
  1123→    "\n"
  1124→    "uniform mat4 projection;\n"
  1125→    "\n"
  1126→    "void main() {\n"
  1127→    "    gl_Position = projection * vec4(aPos, 0.0, 1.0);\n"
  1128→    "    vPos = aPos;\n"
  1129→    "    vUV = aUV;\n"
  1130→    "    vColor = aColor;\n"
  1131→    "    vType = aType;\n"
  1132→    "    vShape = aShape;\n"
  1133→    "    vAddColor = aAddColor;\n"
... [5 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1132→    "    vShape = aShape;\n"
  1133→    "    vAddColor = aAddColor;\n"
  1134→    "}\n";
  1135→
  1136→static const char* fragment_shader_source =
  1137→    "in vec2 vPos;\n"
  1138→    "in vec2 vUV;\n"
  1139→    "in vec4 vColor;\n"
  1140→    "in float vType;\n"
  1141→    "in vec4 vShape;\n"
  1142→    "in vec3 vAddColor;\n"
  1143→    "\n"
  1144→    "out vec4 FragColor;\n"
  1145→    "\n"
  1146→    "uniform float u_aa_width;\n"
  1147→    "uniform sampler2D u_texture;\n"
  1148→    "\n"
  1149→    "// SDF for rectangle in local space\n"
  1150→    "float sdf_rect(vec2 p, vec2 center, vec2 half_size) {\n"
  1151→    "    vec2 d = abs(p - center) - half_size;\n"
  1152→    "    return length(max(d, 0.0)) + min(max(d.x, d.y), 0.0);\n"
  1153→    "}\n"
  1154→    "\n"
  1155→    "// SDF for circle in local space\n"
  1156→    "float sdf_circle(vec2 p, vec2 center, float radius) {\n"
  1157→    "    return length(p - center) - radius;\n"
  1158→    "}\n"
  1159→    "\n"
  1160→    "// SDF for 'pixel-style' circle with cardinal bumps (superellipse, n < 2)\n"
... [65 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1694→    glBindBuffer(GL_ARRAY_BUFFER, vbo);
  1695→    // Allocate space for batch rendering
  1696→    glBufferData(GL_ARRAY_BUFFER, MAX_BATCH_VERTICES * VERTEX_FLOATS * sizeof(float), NULL, GL_DYNAMIC_DRAW);
  1697→
  1698→    // Stride = 16 floats = 64 bytes
  1699→    int stride = VERTEX_FLOATS * sizeof(float);
  1700→
  1701→    // Position attribute (location 0): 2 floats at offset 0
  1702→    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, (void*)0);
  1703→    glEnableVertexAttribArray(0);
  1704→
  1705→    // UV attribute (location 1): 2 floats at offset 2
  1706→    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void*)(2 * sizeof(float)));
  1707→    glEnableVertexAttribArray(1);
  1708→
  1709→    // Color attribute (location 2): 4 floats at offset 4
  1710→    glVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, stride, (void*)(4 * sizeof(float)));
  1711→    glEnableVertexAttribArray(2);
  1712→
  1713→    // Type attribute (location 3): 1 float at offset 8
  1714→    glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, stride, (void*)(8 * sizeof(float)));
  1715→    glEnableVertexAttribArray(3);
  1716→
  1717→    // Shape attribute (location 4): 4 floats at offset 9
  1718→    glVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, stride, (void*)(9 * sizeof(float)));
  1719→    glEnableVertexAttribArray(4);
  1720→
  1721→    // AddColor attribute (location 5): 3 floats at offset 13 (additive flash color)
  1722→    glVertexAttribPointer(5, 3, GL_FLOAT, GL_FALSE, stride, (void*)(13 * sizeof(float)));
... [8 more lines]

459:static void batch_add_vertex(float x, float y, float u, float v,
493:    batch_add_vertex(x0, y0, 0.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3);
494:    batch_add_vertex(x1, y1, 1.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3);
495:    batch_add_vertex(x2, y2, 1.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3);
497:    batch_add_vertex(x0, y0, 0.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3);
498:    batch_add_vertex(x2, y2, 1.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3);
499:    batch_add_vertex(x3, y3, 0.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3);

455→    *a = (color & 0xFF) / 255.0f;
   456→}
   457→
   458→// Add a vertex to the batch (13 floats per vertex)
   459→static void batch_add_vertex(float x, float y, float u, float v,
   460→                             float r, float g, float b, float a,
   461→                             float type, float s0, float s1, float s2, float s3) {
   462→    if (batch_vertex_count >= MAX_BATCH_VERTICES) return;
   463→    int i = batch_vertex_count * VERTEX_FLOATS;
   464→    batch_vertices[i + 0] = x;
   465→    batch_vertices[i + 1] = y;
   466→    batch_vertices[i + 2] = u;
   467→    batch_vertices[i + 3] = v;
   468→    batch_vertices[i + 4] = r;
   469→    batch_vertices[i + 5] = g;
   470→    batch_vertices[i + 6] = b;
   471→    batch_vertices[i + 7] = a;
   472→    batch_vertices[i + 8] = type;
   473→    batch_vertices[i + 9] = s0;   // shape[0]
   474→    batch_vertices[i + 10] = s1;  // shape[1]
   475→    batch_vertices[i + 11] = s2;  // shape[2]
   476→    batch_vertices[i + 12] = s3;  // shape[3]
   477→    batch_vertex_count++;
   478→}
   479→
   480→// Add a quad (two triangles, 6 vertices) for SDF shapes
   481→// UVs go from (0,0) to (1,1) across the quad
   482→// Shape params are the same for all vertices
   483→static void batch_add_sdf_quad(float x0, float y0, float x1, float y1,
   484→                               float x2, float y2, float x3, float y3,
... [30 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   454→    *b = ((color >> 8) & 0xFF) / 255.0f;
   455→    *a = (color & 0xFF) / 255.0f;
   456→}
   457→
   458→// Add a vertex to the batch (16 floats per vertex)
   459→static void batch_add_vertex(float x, float y, float u, float v,
   460→                             float r, float g, float b, float a,
   461→                             float type, float s0, float s1, float s2, float s3,
   462→                             float addR, float addG, float addB) {
   463→    if (batch_vertex_count >= MAX_BATCH_VERTICES) return;
   464→    int i = batch_vertex_count * VERTEX_FLOATS;
   465→    batch_vertices[i + 0] = x;
   466→    batch_vertices[i + 1] = y;
   467→    batch_vertices[i + 2] = u;
   468→    batch_vertices[i + 3] = v;
   469→    batch_vertices[i + 4] = r;
   470→    batch_vertices[i + 5] = g;
   471→    batch_vertices[i + 6] = b;
   472→    batch_vertices[i + 7] = a;
   473→    batch_vertices[i + 8] = type;
   474→    batch_vertices[i + 9] = s0;    // shape[0]
   475→    batch_vertices[i + 10] = s1;   // shape[1]
   476→    batch_vertices[i + 11] = s2;   // shape[2]
   477→    batch_vertices[i + 12] = s3;   // shape[3]
   478→    batch_vertices[i + 13] = addR; // additive color R (flash)
   479→    batch_vertices[i + 14] = addG; // additive color G (flash)
   480→    batch_vertices[i + 15] = addB; // additive color B (flash)
   481→    batch_vertex_count++;
   482→}
... [4 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   480→    batch_vertices[i + 15] = addB; // additive color B (flash)
   481→    batch_vertex_count++;
   482→}
   483→
   484→// Add a quad (two triangles, 6 vertices) for SDF shapes
   485→// UVs go from (0,0) to (1,1) across the quad
   486→// Shape params are the same for all vertices
   487→// addR/G/B is additive color (flash effect)
   488→static void batch_add_sdf_quad(float x0, float y0, float x1, float y1,
   489→                               float x2, float y2, float x3, float y3,
   490→                               float r, float g, float b, float a,
   491→                               float type, float s0, float s1, float s2, float s3,
   492→                               float addR, float addG, float addB) {
   493→    // Quad corners with UVs:
   494→    // 0(0,0)---1(1,0)
   495→    // |         |
   496→    // 3(0,1)---2(1,1)
   497→
   498→    // Triangle 1: 0, 1, 2
   499→    batch_add_vertex(x0, y0, 0.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   500→    batch_add_vertex(x1, y1, 1.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   501→    batch_add_vertex(x2, y2, 1.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   502→    // Triangle 2: 0, 2, 3
   503→    batch_add_vertex(x0, y0, 0.0f, 0.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   504→    batch_add_vertex(x2, y2, 1.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   505→    batch_add_vertex(x3, y3, 0.0f, 1.0f, r, g, b, a, type, s0, s1, s2, s3, addR, addG, addB);
   506→}
   507→
   508→static SDL_Window* window = NULL;
... [2 more lines]

488:static void batch_add_sdf_quad(float x0, float y0, float x1, float y1,
651:    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
688:    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
733:    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,

645→    // Unpack color
   646→    float r, g, b, a;
   647→    unpack_color(cmd->color, &r, &g, &b, &a);
   648→
   649→    // Add SDF quad: shape = (quad_w, quad_h, half_w, half_h)
   650→    // Shader computes local_p = vUV * quad_size, center = quad_size * 0.5
   651→    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
   652→                       r, g, b, a,
   653→                       SHAPE_TYPE_RECT, quad_w, quad_h, half_w, half_h);
   654→}
   655→
   656→// Process a circle command (SDF-based, UV-space approach)
   657→// Same UV-space approach as rectangles for rotation support.
   658→static void process_circle(const DrawCommand* cmd) {
   659→    float x = cmd->params[0];

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   645→    // Unpack color
   646→    float r, g, b, a;
   647→    unpack_color(cmd->color, &r, &g, &b, &a);
   648→
   649→    // Add SDF quad: shape = (quad_w, quad_h, half_w, half_h)
   650→    // Shader computes local_p = vUV * quad_size, center = quad_size * 0.5
   651→    // No flash for shapes (additive = 0)
   652→    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
   653→                       r, g, b, a,
   654→                       SHAPE_TYPE_RECT, quad_w, quad_h, half_w, half_h,
   655→                       0.0f, 0.0f, 0.0f);
   656→}
   657→
   658→// Process a circle command (SDF-based, UV-space approach)
   659→// Same UV-space approach as rectangles for rotation support.
   660→static void process_circle(const DrawCommand* cmd) {

682→    transform_point(cmd->transform, lx3, ly3, &wx3, &wy3);
   683→
   684→    // Unpack color
   685→    float r, g, b, a;
   686→    unpack_color(cmd->color, &r, &g, &b, &a);
   687→
   688→    // Add SDF quad: shape = (quad_size, quad_size, radius, unused)
   689→    // Shader computes local_p = vUV * quad_size, center = quad_size * 0.5
   690→    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
   691→                       r, g, b, a,
   692→                       SHAPE_TYPE_CIRCLE, quad_size, quad_size, radius, 0.0f);
   693→}
   694→
   695→// Forward declaration of batch_flush (needed for process_sprite)
   696→static void batch_flush(void);

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   684→    // Unpack color
   685→    float r, g, b, a;
   686→    unpack_color(cmd->color, &r, &g, &b, &a);
   687→
   688→    // Add SDF quad: shape = (quad_size, quad_size, radius, unused)
   689→    // Shader computes local_p = vUV * quad_size, center = quad_size * 0.5
   690→    // No flash for shapes (additive = 0)
   691→    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
   692→                       r, g, b, a,
   693→                       SHAPE_TYPE_CIRCLE, quad_size, quad_size, radius, 0.0f,
   694→                       0.0f, 0.0f, 0.0f);
   695→}
   696→
   697→// Forward declaration of batch_flush (needed for process_sprite)
   698→static void batch_flush(void);
   699→

700→// Process a sprite command (texture sampling)
   701→// Image is centered at (x, y) in local coordinates
   702→static void process_sprite(const DrawCommand* cmd) {
   703→    float x = cmd->params[0];
   704→    float y = cmd->params[1];
   705→    float w = cmd->params[2];
   706→    float h = cmd->params[3];
   707→
   708→    // Flush batch if texture changes
   709→    if (current_batch_texture != cmd->texture_id && batch_vertex_count > 0) {
   710→        batch_flush();
   711→    }
   712→    current_batch_texture = cmd->texture_id;
   713→
   714→    // Image is centered at (x, y), so compute corners
   715→    float half_w = w * 0.5f;
   716→    float half_h = h * 0.5f;
   717→
   718→    // Local corners (centered at x, y)
   719→    float lx0 = x - half_w, ly0 = y - half_h;
   720→    float lx1 = x + half_w, ly1 = y - half_h;
   721→    float lx2 = x + half_w, ly2 = y + half_h;
   722→    float lx3 = x - half_w, ly3 = y + half_h;
   723→
   724→    // Transform to world coordinates
   725→    float wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3;
   726→    transform_point(cmd->transform, lx0, ly0, &wx0, &wy0);
   727→    transform_point(cmd->transform, lx1, ly1, &wx1, &wy1);
   728→    transform_point(cmd->transform, lx2, ly2, &wx2, &wy2);
   729→    transform_point(cmd->transform, lx3, ly3, &wx3, &wy3);
... [20 more lines]

98:} DrawCommand;

80→//   SPRITE: x,y is center (texture drawn centered at that point)
    81→typedef struct {
    82→    uint8_t type;           // SHAPE_RECTANGLE, SHAPE_CIRCLE, SHAPE_SPRITE
    83→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    84→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    85→
    86→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
    87→    uint32_t color;         // Packed RGBA (4 bytes)
    88→
    89→    // Shape parameters (meaning depends on type)
    90→    // RECTANGLE: params[0]=x, [1]=y, [2]=w, [3]=h
    91→    // CIRCLE: params[0]=x, [1]=y, [2]=radius
    92→    // SPRITE: params[0]=x, [1]=y, [2]=w, [3]=h, [4]=ox, [5]=oy (+ texture_id)
    93→    float params[6];        // 24 bytes (reduced from 8 to fit 64-byte target)
    94→
    95→    GLuint texture_id;      // For SPRITE (4 bytes)
    96→    // Total: 4 + 24 + 4 + 24 + 4 = 60 bytes, padded to 64
    97→    uint8_t _pad2[4];       // Explicit padding to reach 64 bytes
    98→} DrawCommand;
    99→
   100→// Verify DrawCommand is exactly 64 bytes (compile-time check)
   101→#ifdef _MSC_VER
   102→    static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   103→#else
   104→    _Static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   105→#endif
   106→
   107→// Layer
   108→typedef struct {
   109→    GLuint fbo;

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    76→//
    77→// Coordinate conventions:
    78→//   RECTANGLE: x,y is top-left corner, w,h extend right and down (matches SDL/LÖVE)
    79→//   CIRCLE: x,y is center, radius extends outward
    80→//   SPRITE: x,y is center (texture drawn centered at that point)
    81→typedef struct {
    82→    uint8_t type;           // SHAPE_RECTANGLE, SHAPE_CIRCLE, SHAPE_SPRITE
    83→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    84→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    85→
    86→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
    87→    uint32_t color;         // Packed RGBA for multiply/tint (4 bytes)
    88→
    89→    // Shape parameters (meaning depends on type)
    90→    // RECTANGLE: params[0]=x, [1]=y, [2]=w, [3]=h
    91→    // CIRCLE: params[0]=x, [1]=y, [2]=radius
    92→    // SPRITE: params[0]=x, [1]=y, [2]=w, [3]=h, [4]=ox, [5]=oy (+ texture_id)
    93→    float params[6];        // 24 bytes (reduced from 8 to fit 64-byte target)
    94→
    95→    GLuint texture_id;      // For SPRITE (4 bytes)
    96→    uint32_t flash_color;   // Packed RGB for additive flash (uses only RGB, alpha ignored)
    97→    // Total: 4 + 24 + 4 + 24 + 4 + 4 = 64 bytes
    98→} DrawCommand;
    99→
   100→// Verify DrawCommand is exactly 64 bytes (compile-time check)
   101→#ifdef _MSC_VER
   102→    static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");

345:static void layer_add_image(Layer* layer, Texture* tex, float x, float y, uint32_t color) {

340→    cmd->params[1] = y;
   341→    cmd->params[2] = radius;
   342→}
   343→
   344→// Record a sprite/image command (centered at x, y)
   345→static void layer_add_image(Layer* layer, Texture* tex, float x, float y, uint32_t color) {
   346→    DrawCommand* cmd = layer_add_command(layer);
   347→    if (!cmd) return;
   348→    cmd->type = SHAPE_SPRITE;
   349→    cmd->color = color;
   350→    cmd->texture_id = tex->id;
   351→    cmd->params[0] = x;
   352→    cmd->params[1] = y;
   353→    cmd->params[2] = (float)tex->width;
   354→    cmd->params[3] = (float)tex->height;
   355→}
   356→
   357→// Set the current blend mode for subsequent commands
   358→static void layer_set_blend_mode(Layer* layer, uint8_t mode) {
   359→    layer->current_blend = mode;
   360→}
   361→
   362→// Batch rendering
   363→#define MAX_BATCH_VERTICES 6000  // 1000 quads * 6 vertices
   364→#define VERTEX_FLOATS 16         // x, y, u, v, r, g, b, a, type, shape[4], addR, addG, addB

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   340→    cmd->params[1] = y;
   341→    cmd->params[2] = radius;
   342→}
   343→
   344→// Record a sprite/image command (centered at x, y)
   345→// color = multiply/tint color (RGBA), flash_color = additive flash color (RGB, alpha ignored)
   346→static void layer_add_image(Layer* layer, Texture* tex, float x, float y, uint32_t color, uint32_t flash_color) {
   347→    DrawCommand* cmd = layer_add_command(layer);
   348→    if (!cmd) return;
   349→    cmd->type = SHAPE_SPRITE;
   350→    cmd->color = color;
   351→    cmd->flash_color = flash_color;
   352→    cmd->texture_id = tex->id;
   353→    cmd->params[0] = x;
   354→    cmd->params[1] = y;
   355→    cmd->params[2] = (float)tex->width;
   356→    cmd->params[3] = (float)tex->height;
   357→}
   358→
   359→// Set the current blend mode for subsequent commands
   360→static void layer_set_blend_mode(Layer* layer, uint8_t mode) {
   361→    layer->current_blend = mode;

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   729→    transform_point(cmd->transform, lx1, ly1, &wx1, &wy1);
   730→    transform_point(cmd->transform, lx2, ly2, &wx2, &wy2);
   731→    transform_point(cmd->transform, lx3, ly3, &wx3, &wy3);
   732→
   733→    // Unpack color (used for tinting)
   734→    float r, g, b, a;
   735→    unpack_color(cmd->color, &r, &g, &b, &a);
   736→
   737→    // Unpack flash color (additive, alpha ignored)
   738→    float addR, addG, addB, addA;
   739→    unpack_color(cmd->flash_color, &addR, &addG, &addB, &addA);
   740→    (void)addA;  // Alpha not used for additive color
   741→
   742→    // Add sprite quad with UVs (0,0) to (1,1)
   743→    // shape params unused for sprites, but we still use the same vertex format
   744→    batch_add_sdf_quad(wx0, wy0, wx1, wy1, wx2, wy2, wx3, wy3,
   745→                       r, g, b, a,
   746→                       SHAPE_TYPE_SPRITE, 0.0f, 0.0f, 0.0f, 0.0f,
   747→                       addR, addG, addB);
   748→}
   749→
   750→// Apply GL blend state based on blend mode
   751→static void apply_blend_mode(uint8_t mode) {
   752→    switch (mode) {

950:static int l_layer_draw_texture(lua_State* L) {

945→    Texture* tex = (Texture*)lua_touserdata(L, 1);
   946→    lua_pushinteger(L, tex->height);
   947→    return 1;
   948→}
   949→
   950→static int l_layer_draw_texture(lua_State* L) {
   951→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   952→    Texture* tex = (Texture*)lua_touserdata(L, 2);
   953→    float x = (float)luaL_checknumber(L, 3);
   954→    float y = (float)luaL_checknumber(L, 4);
   955→    uint32_t color = (uint32_t)luaL_optinteger(L, 5, 0xFFFFFFFF);  // Default white (no tint)
   956→    layer_add_image(layer, tex, x, y, color);
   957→    return 0;
   958→}
   959→
   960→static int l_layer_set_blend_mode(lua_State* L) {
   961→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   962→    const char* mode = luaL_checkstring(L, 2);
   963→    if (strcmp(mode, "alpha") == 0) {
   964→        layer_set_blend_mode(layer, BLEND_ALPHA);

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   946→    lua_pushinteger(L, tex->height);
   947→    return 1;
   948→}
   949→
   950→static int l_layer_draw_texture(lua_State* L) {
   951→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   952→    Texture* tex = (Texture*)lua_touserdata(L, 2);
   953→    float x = (float)luaL_checknumber(L, 3);
   954→    float y = (float)luaL_checknumber(L, 4);
   955→    uint32_t color = (uint32_t)luaL_optinteger(L, 5, 0xFFFFFFFF);  // Default white (no tint)
   956→    uint32_t flash = (uint32_t)luaL_optinteger(L, 6, 0x00000000);  // Default black (no flash)
   957→    layer_add_image(layer, tex, x, y, color, flash);
   958→    return 0;
   959→}
   960→
   961→static int l_layer_set_blend_mode(lua_State* L) {
   962→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   963→    const char* mode = luaL_checkstring(L, 2);

Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

E:\a327ex\Anchor\reference\super emoji box\main.lua
E:\a327ex\Anchor\reference\love-compare\main.lua
E:\a327ex\Anchor\test\main.lua

1095→
  1096→// Main loop state (needed for emscripten)
  1097→static bool running = true;
  1098→static Uint64 perf_freq = 0;
  1099→static Uint64 last_time = 0;
  1100→static double physics_lag = 0.0;
  1101→static double render_lag = 0.0;
  1102→static Uint64 step = 0;
  1103→static double game_time = 0.0;
  1104→static Uint64 frame = 0;
  1105→
  1106→// VSync snap frequencies (computed at init based on display refresh rate)
  1107→static double snap_frequencies[8];
  1108→static int snap_frequency_count = 0;
  1109→
  1110→// Reset timing accumulators (call on focus gain, scene transitions, etc.)
  1111→// This prevents accumulated lag from causing catch-up updates
  1112→static void timing_resync(void) {
  1113→    physics_lag = 0.0;
  1114→    render_lag = 0.0;

1120:    #define SHADER_HEADER_VERT "#version 300 es\n"
1121:    #define SHADER_HEADER_FRAG "#version 300 es\nprecision mediump float;\n"
1123:    #define SHADER_HEADER_VERT "#version 330 core\n"
1124:    #define SHADER_HEADER_FRAG "#version 330 core\n"
1262:    const char* header = (type == GL_VERTEX_SHADER) ? SHADER_HEADER_VERT : SHADER_HEADER_FRAG;

File created successfully at: E:\a327ex\Anchor\test\shaders\outline.frag

File created successfully at: E:\a327ex\Anchor\test\shaders\shadow.frag

E:\a327ex\Anchor\reference\super emoji box\tools\changes.txt:372:  * Added shadow sampler support for Canvases.
E:\a327ex\Anchor\reference\super emoji box\main.lua:9:  shadow = object():layer()
E:\a327ex\Anchor\reference\super emoji box\main.lua:19:  back_2:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:20:  game:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:21:  game_2:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:22:  front:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:23:  front_2:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:24:  effects:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:25:  effects_2:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:26:  front:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:27:  ui:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:28:  ui_2:layer_add_canvas('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:39:  lun:shader('shadow', nil, 'assets/shadow.frag')
E:\a327ex\Anchor\reference\super emoji box\main.lua:40:  lun:shader('outline', nil, 'assets/outline.frag')
E:\a327ex\Anchor\reference\super emoji box\main.lua:130:    back_2:layer_draw_to_canvas('outline', function() back_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:131:    game:layer_draw_to_canvas('outline', function() game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:132:    game_2:layer_draw_to_canvas('outline', function() game_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:133:    front:layer_draw_to_canvas('outline', function() front:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:134:    front_2:layer_draw_to_canvas('outline', function() front_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:135:    effects:layer_draw_to_canvas('outline', function() effects:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:136:    effects_2:layer_draw_to_canvas('outline', function() effects_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:137:    ui:layer_draw_to_canvas('outline', function() ui:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:138:    ui_2:layer_draw_to_canvas('outline', function() ui_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
E:\a327ex\Anchor\reference\super emoji box\main.lua:140:    shadow:layer_draw_to_canvas('main', function()
E:\a327ex\Anchor\reference\super emoji box\main.lua:141:      game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)
E:\a327ex\Anchor\reference\super emoji box\main.lua:142:      effects:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)
E:\a327ex\Anchor\reference\super emoji box\main.lua:147:      back_2:layer_draw('outline')
E:\a327ex\Anchor\reference\super emoji box\main.lua:149:      shadow.x, shadow.y = 2*lun.sx, 2*lun.sy
E:\a327ex\Anchor\reference\super emoji box\main.lua:150:      shadow:layer_draw()
E:\a327ex\Anchor\reference\super emoji box\main.lua:151:      game:layer_draw('outline')
... [11 more lines]

1→require 'lun.object'
     2→
     3→function init()
     4→  lun:engine_start('super emoji box', 640, 360, 2.5, 2.5, 'twitter_emoji', 'rough', true)
     5→  lun:input_bind_all()
     6→
     7→  back = object():layer()
     8→  back_2 = object():layer()
     9→  shadow = object():layer()
    10→  game = object():layer()
    11→  game_2 = object():layer()
    12→  front = object():layer()
    13→  front_2 = object():layer()
    14→  effects = object():layer()
    15→  effects_2 = object():layer()
    16→  ui_back = object():layer()
    17→  ui = object():layer()
    18→  ui_2 = object():layer()
    19→  back_2:layer_add_canvas('outline')
    20→  game:layer_add_canvas('outline')
    21→  game_2:layer_add_canvas('outline')
    22→  front:layer_add_canvas('outline')
    23→  front_2:layer_add_canvas('outline')
    24→  effects:layer_add_canvas('outline')
    25→  effects_2:layer_add_canvas('outline')
    26→  front:layer_add_canvas('outline')
    27→  ui:layer_add_canvas('outline')
    28→  ui_2:layer_add_canvas('outline')
    29→
    30→  lun:input_bind('left', {'key:left', 'key:a', 'axis:leftx-', 'button:dpleft'})
... [50 more lines]

125→    effects_2:layer_draw_commands()
   126→    ui_back:layer_draw_commands()
   127→    ui:layer_draw_commands()
   128→    ui_2:layer_draw_commands()
   129→
   130→    back_2:layer_draw_to_canvas('outline', function() back_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   131→    game:layer_draw_to_canvas('outline', function() game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   132→    game_2:layer_draw_to_canvas('outline', function() game_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   133→    front:layer_draw_to_canvas('outline', function() front:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   134→    front_2:layer_draw_to_canvas('outline', function() front_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   135→    effects:layer_draw_to_canvas('outline', function() effects:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   136→    effects_2:layer_draw_to_canvas('outline', function() effects_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   137→    ui:layer_draw_to_canvas('outline', function() ui:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   138→    ui_2:layer_draw_to_canvas('outline', function() ui_2:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.outline) end)
   139→
   140→    shadow:layer_draw_to_canvas('main', function()
   141→      game:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)
   142→      effects:layer_draw('main', 0, 0, 0, 1, 1, lun.colors.white[0], lun.shaders.shadow, true)
   143→    end)
   144→
   145→    self:layer_draw_to_canvas('main', function()
   146→      back:layer_draw()
   147→      back_2:layer_draw('outline')
   148→      back_2:layer_draw()
   149→      shadow.x, shadow.y = 2*lun.sx, 2*lun.sy
   150→      shadow:layer_draw()
   151→      game:layer_draw('outline')
   152→      game:layer_draw()
   153→      game_2:layer_draw('outline')
   154→      game_2:layer_draw()
... [30 more lines]

1→print("main.lua loaded")
     2→
     3→-- Set to "rough" for hard pixel edges, "smooth" for anti-aliased
     4→set_shape_filter("rough")
     5→
     6→local screen_w, screen_h = 480, 270
     7→
     8→-- HSV to RGB (h: 0-360, s: 0-1, v: 0-1)
     9→local function hsv_to_rgb(h, s, v)
    10→    local c = v * s
    11→    local x = c * (1 - math.abs((h / 60) % 2 - 1))
    12→    local m = v - c
    13→    local r, g, b = 0, 0, 0
    14→    if h < 60 then r, g, b = c, x, 0
    15→    elseif h < 120 then r, g, b = x, c, 0
    16→    elseif h < 180 then r, g, b = 0, c, x
    17→    elseif h < 240 then r, g, b = 0, x, c
    18→    elseif h < 300 then r, g, b = x, 0, c
    19→    else r, g, b = c, 0, x
    20→    end
    21→    return math.floor((r + m) * 255), math.floor((g + m) * 255), math.floor((b + m) * 255)
    22→end
    23→
    24→--{{{ Circle size comparison test
    25→--[[
    26→local top_circles = {}
    27→local rows = {{}, {}}  -- track circles per row for centering
    28→local radius = 1
    29→local spacing = 2  -- gap between circles
    30→local x = 0
... [513 more lines]

No matches found

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E:\a327ex\Anchor\reference\super emoji box\main.lua:180:    ['alien'] = object():color_255(204, 214, 221, 255, 0.01),
E:\a327ex\Anchor\reference\super emoji box\main.lua:181:    ['clown'] = object():color_255(254, 231, 184, 255, 0.01),
E:\a327ex\Anchor\reference\super emoji box\lun\color.lua:52:    white = object():color_255(255, 255, 255, 255, 0.025)
E:\a327ex\Anchor\reference\super emoji box\lun\color.lua:53:    black = object():color_255(0, 0, 0, 255, 0.025)
E:\a327ex\Anchor\reference\super emoji box\lun\color.lua:54:    gray = object():color_255(128, 128, 128, 255, 0.025)
E:\a327ex\Anchor\reference\super emoji box\lun\color.lua:56:function color:color_255(r, g, b, a, step, alpha_step)
E:\a327ex\Anchor\reference\super emoji box\lun\color.lua:198:    white = object():color_255(255, 255, 255, 255, 0.025)
E:\a327ex\Anchor\reference\super emoji box\lun\lun.lua:192:        white = object():color_255(255, 255, 255, 255, 0.025),
E:\a327ex\Anchor\reference\super emoji box\lun\lun.lua:193:        black = object():color_255(0, 0, 0, 255, 0.025),
E:\a327ex\Anchor\reference\super emoji box\lun\lun.lua:194:        fg = object():color_255(255, 255, 255, 255, 0.025),

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195:        bg = object():color_255(0, 0, 0, 255, 0.025),
211:        bg = object():color_255(48, 48, 48, 255, 0.025),
225:        bg = object():color_hex('#111111ff', 0.025),
239:        bg = object():color_255(48, 49, 50, 255, 0.01),
255:        bg = object():color_255(66, 66, 66, 255, 0.025),
271:        bg = object():color_hex('#0c0e0fff', 0.01),
293:        bg = object():color_hex('#efefefff', 0.025),
294:        bg_dark = object():color_hex('#e6e6e6ff', 0.025),
337:        bg = object():color_255(51, 49, 67, 255, 0.01),
353:        bg = object():color_255(61, 61, 60, 255, 0.01),

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285→        magenta2 = object():color_hex('#c58cecff', 0.01),
   286→        cyan1 = object():color_hex('#67afc1ff', 0.01),
   287→        cyan2 = object():color_hex('#70b8caff', 0.01),
   288→      }
   289→    elseif self.theme == 'isle_of_lore' then -- https =//stevencolling.itch.io/isle-of-lore-2-hex-tiles-regular
   290→      self.colors = {
   291→        white = object():color_hex('#ffffffff', 0.025),
   292→        fg = object():color_hex('#161616ff', 0.025),
   293→        bg = object():color_hex('#efefefff', 0.025),
   294→        bg_dark = object():color_hex('#e6e6e6ff', 0.025),
   295→        cloud_light = object():color_hex('#dadadaff', 0.025),
   296→        cloud_dark = object():color_hex('#797979ff', 0.025),
   297→        dark = object():color_hex('#161616ff', 0.025),
   298→        gray_light = object():color_hex('#262626ff', 0.025),
   299→        gray_dark = object():color_hex('#1f1f1fff', 0.025),
   300→        blue_light = object():color_hex('#56837fff', 0.025),
   301→        blue_medium = object():color_hex('#3c5858ff', 0.025),
   302→        blue_dark = object():color_hex('#263236ff', 0.025),
   303→        brown_light = object():color_hex('#92744dff', 0.025),
   304→        brown_dark = object():color_hex('#644939ff', 0.025),
   305→        green_light = object():color_hex('#e8df63ff', 0.025),
   306→        green_medium = object():color_hex('#889954ff', 0.025),
   307→        green_dark = object():color_hex('#3a5241ff', 0.025),
   308→        red = object():color_hex('#9c4741ff', 0.025),
   309→        orange = object():color_hex('#d09a54ff', 0.025),
   310→        yellow = object():color_hex('#edc95eff', 0.025),
   311→        water_light = object():color_hex('#51c4b9ff', 0.025),
   312→        water_medium = object():color_hex('#35a1a0ff', 0.025),
   313→        water_dark = object():color_hex('#37838bff', 0.025),
   314→        stone = object():color_hex('#a78979ff', 0.025),

234:    elseif self.theme == 'twitter_emoji' then -- colors taken from twitter emoji set
235-      self.colors = {
236-        white = object():color_255(255, 255, 255, 255, 0.01),
237-        black = object():color_255(0, 0, 0, 255, 0.01),
238-        gray = object():color_255(128, 128, 128, 255, 0.01),
239-        bg = object():color_255(48, 49, 50, 255, 0.01),
240-        fg = object():color_255(231, 232, 233, 255, 0.01),
241-        fg_dark = object():color_255(201, 202, 203, 255, 0.01),
242-        yellow = object():color_255(253, 205, 86, 255, 0.01),
243-        orange = object():color_255(244, 146, 0, 255, 0.01),
244-        blue = object():color_255(83, 175, 239, 255, 0.01),
245-        green = object():color_255(122, 179, 87, 255, 0.01),
246-        red = object():color_255(223, 37, 64, 255, 0.01),
247-        purple = object():color_255(172, 144, 216, 255, 0.01),
248-        brown = object():color_255(195, 105, 77, 255, 0.01),
249-      }

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→print("main.lua loaded - Effects Test")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(48, 49, 50, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local outline_layer = layer_create('outline')
    12→local game = layer_create('game')
    13→
    14→-- Load shaders
    15→local outline_shader = shader_load_file('shaders/outline.frag')
    16→print("Outline shader loaded: " .. tostring(outline_shader))
    17→
    18→-- Load textures
    19→local smile_tex = texture_load("assets/slight_smile.png")
    20→local star_tex = texture_load("assets/star.png")
    21→
    22→-- Target display sizes
    23→local smile_size = 36
    24→local star_size = 14
    25→
    26→-- Calculate scale factors (textures are 512x512)
    27→local smile_scale = smile_size / texture_get_width(smile_tex)
    28→local star_scale = star_size / texture_get_width(star_tex)
    29→
... [133 more lines]

Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

E:\a327ex\Anchor\engine\build.bat
E:\a327ex\Anchor\tools\build.bat

Exit code 1
anchor.c
src/anchor.c(842): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
src/anchor.c(977): warning C4013: 'effect_shader_load_file' undefined; assuming extern returning int
src/anchor.c(987): warning C4013: 'effect_shader_load_string' undefined; assuming extern returning int
src/anchor.c(997): warning C4013: 'effect_shader_destroy' undefined; assuming extern returning int
src/anchor.c(1005): warning C4013: 'shader_set_float' undefined; assuming extern returning int
src/anchor.c(1014): warning C4013: 'shader_set_vec2' undefined; assuming extern returning int
src/anchor.c(1025): warning C4013: 'shader_set_vec4' undefined; assuming extern returning int
src/anchor.c(1033): warning C4013: 'shader_set_int' undefined; assuming extern returning int
src/anchor.c(1042): warning C4013: 'shader_set_texture' undefined; assuming extern returning int
src/anchor.c(1344): warning C4142: 'effect_shader_load_string': benign redefinition of type
src/anchor.c(1349): warning C4142: 'effect_shader_load_file': benign redefinition of type
src/anchor.c(1361): error C2371: 'effect_shader_destroy': redefinition; different basic types
src/anchor.c(1368): error C2371: 'shader_set_float': redefinition; different basic types
src/anchor.c(1374): error C2371: 'shader_set_vec2': redefinition; different basic types
src/anchor.c(1380): error C2371: 'shader_set_vec4': redefinition; different basic types
src/anchor.c(1386): error C2371: 'shader_set_int': redefinition; different basic types
src/anchor.c(1392): error C2371: 'shader_set_texture': redefinition; different basic types
gl.c
Generating Code...
Build failed!

850→static int l_layer_create(lua_State* L) {
   851→    const char* name = luaL_checkstring(L, 1);
   852→    Layer* layer = layer_get_or_create(name);
   853→    if (!layer) {
   854→        return luaL_error(L, "Failed to create layer: %s", name);
   855→    }
   856→    lua_pushlightuserdata(L, layer);
   857→    return 1;
   858→}
   859→
   860→static int l_layer_rectangle(lua_State* L) {
   861→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   862→    float x = (float)luaL_checknumber(L, 2);
   863→    float y = (float)luaL_checknumber(L, 3);
   864→    float w = (float)luaL_checknumber(L, 4);
   865→    float h = (float)luaL_checknumber(L, 5);
   866→    uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
   867→    layer_add_rectangle(layer, x, y, w, h, color);
   868→    return 0;
   869→}

835→    if (!layer) {
   836→        fprintf(stderr, "Error: Failed to create layer '%s'\n", name);
   837→        return NULL;
   838→    }
   839→
   840→    // Store in registry
   841→    layer_registry[layer_count] = layer;
   842→    layer_names[layer_count] = strdup(name);
   843→    layer_count++;
   844→
   845→    printf("Created layer: %s\n", name);
   846→    return layer;
   847→}
   848→
   849→// Lua bindings
   850→static int l_layer_create(lua_State* L) {
   851→    const char* name = luaL_checkstring(L, 1);
   852→    Layer* layer = layer_get_or_create(name);
   853→    if (!layer) {
   854→        return luaL_error(L, "Failed to create layer: %s", name);

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   841→    layer_registry[layer_count] = layer;
   842→    layer_names[layer_count] = strdup(name);
   843→    layer_count++;
   844→
   845→    printf("Created layer: %s\n", name);
   846→    return layer;
   847→}
   848→
   849→// Forward declarations for effect shader functions (defined after shader sources)
   850→static GLuint effect_shader_load_file(const char* path);
   851→static GLuint effect_shader_load_string(const char* frag_source);
   852→static void effect_shader_destroy(GLuint shader);
   853→static void shader_set_float(GLuint shader, const char* name, float value);
   854→static void shader_set_vec2(GLuint shader, const char* name, float x, float y);
   855→static void shader_set_vec4(GLuint shader, const char* name, float x, float y, float z, float w);
   856→static void shader_set_int(GLuint shader, const char* name, int value);
   857→static void shader_set_texture(GLuint shader, const char* name, GLuint texture, int unit);
   858→
   859→// Lua bindings
   860→static int l_layer_create(lua_State* L) {
   861→    const char* name = luaL_checkstring(L, 1);
   862→    Layer* layer = layer_get_or_create(name);
   863→    if (!layer) {

anchor.c
src/anchor.c(842): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
gl.c
Generating Code...
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
Build successful: build/anchor.exe

1252:static const char* screen_vertex_source =
1254:    "layout (location = 1) in vec2 aTexCoord;\n"
1255:    "out vec2 TexCoord;\n"
1258:    "    TexCoord = aTexCoord;\n"
1262:    "in vec2 TexCoord;\n"
1266:    "    FragColor = texture(screenTexture, TexCoord);\n"
1353:// Create an effect shader program from fragment source (uses screen_vertex_source)
1355:    return create_shader_program(screen_vertex_source, frag_source);
1758:    screen_shader = create_shader_program(screen_vertex_source, screen_fragment_source);
1789:    // TexCoord attribute (location 1): 2 floats

total 36
drwxr-xr-x 1 adn 197121     0 Jan  7 19:16 ./
drwxr-xr-x 1 adn 197121     0 Jan  8 09:28 ../
-rw-r--r-- 1 adn 197121 19583 Feb 25  2024 slight_smile.png
-rw-r--r-- 1 adn 197121 12699 Mar 26  2024 star.png

total 5
drwxr-xr-x 1 adn 197121    0 Jan  8 09:25 ./
drwxr-xr-x 1 adn 197121    0 Jan  8 09:28 ../
-rw-r--r-- 1 adn 197121 2046 Jan  8 09:25 outline.frag
-rw-r--r-- 1 adn 197121  301 Jan  8 09:25 shadow.frag

print("main.lua loaded")

-- Set to "rough" for hard pixel edges, "smooth" for anti-aliased
set_shape_filter("rough")

local screen_w, screen_h = 480, 270

-- HSV to RGB (h: 0-360, s: 0-1, v: 0-1)
local function hsv_to_rgb(h, s, v)
    local c = v * s
    local x = c * (1 - math.abs((h / 60) % 2 - 1))
    local m = v - c
    local r, g, b = 0, 0, 0
    if h < 60 then r, g, b = c, x, 0
    elseif h < 120 then r, g, b = x, c, 0
    elseif h < 180 then r, g, b = 0, c, x
    elseif h < 240 then r, g, b = 0, x, c
    elseif h < 300 then r, g, b = x, 0, c
    else r, g, b = c, 0, x
    end
    return math.floor((r + m) * 255), math.floor((g + m) * 255), math.floor((b + m) * 255)
end

--{{{ Circle size comparison test
--[[
local top_circles = {}
local rows = {{}, {}}  -- track circles per row for centering
local radius = 1
local spacing = 2  -- gap between circles
local x = 0
... [512 more lines]

1→print("main.lua loaded - Effects Test")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(48, 49, 50, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local outline_layer = layer_create('outline')
    12→local game = layer_create('game')
    13→
    14→-- Load shaders
    15→local outline_shader = shader_load_file('shaders/outline.frag')
    16→print("Outline shader loaded: " .. tostring(outline_shader))
    17→
    18→-- Load textures
    19→local smile_tex = texture_load("assets/slight_smile.png")
    20→local star_tex = texture_load("assets/star.png")
    21→
    22→-- Target display sizes
    23→local smile_size = 36
    24→local star_size = 14
    25→
    26→-- Calculate scale factors (textures are 512x512)
    27→local smile_scale = smile_size / texture_get_width(smile_tex)
    28→local star_scale = star_size / texture_get_width(star_tex)
    29→
    30→-- HSV to RGB (h: 0-360, s: 0-1, v: 0-1)
... [132 more lines]

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). To tell you how to proceed, the user said:
Won't this overwrite the new one?

Updated 1 path from the index

535→        layer_push(stars_layer, emoji.x, emoji.y, orbit_angle, 1, 1)
   536→            layer_push(stars_layer, orbit_radius, 0, star_spin, star_scale, star_scale)
   537→                layer_draw_texture(stars_layer, star_tex, 0, 0)
   538→            layer_pop(stars_layer)
   539→        layer_pop(stars_layer)
   540→    end
   541→end
   542→--}}}
   543→

The file E:\a327ex\Anchor\test\shaders\outline.frag has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→// Outline shader - TEST VERSION: outputs solid red to verify shader is applied
     2→in vec2 TexCoord;
     3→out vec4 FragColor;
     4→uniform sampler2D u_texture;
     5→uniform vec2 u_pixel_size;
     6→
     7→void main() {
     8→    // TEST: output solid red to verify shader is being applied
     9→    FragColor = vec4(1.0, 0.0, 0.0, 1.0);
    10→}
    11→

529:static GLuint screen_vao = 0;
575:    glBindVertexArray(screen_vao);
1432:    if (screen_vao) { glDeleteVertexArrays(1, &screen_vao); screen_vao = 0; }
1615:            glBindVertexArray(screen_vao);
1719:    glGenVertexArrays(1, &vao);
1778:    glGenVertexArrays(1, &screen_vao);
1781:    glBindVertexArray(screen_vao);

1770→        -1.0f, -1.0f,  0.0f, 0.0f,
  1771→         1.0f, -1.0f,  1.0f, 0.0f,
  1772→         1.0f,  1.0f,  1.0f, 1.0f,
  1773→        -1.0f, -1.0f,  0.0f, 0.0f,
  1774→         1.0f,  1.0f,  1.0f, 1.0f,
  1775→        -1.0f,  1.0f,  0.0f, 1.0f,
  1776→    };
  1777→
  1778→    glGenVertexArrays(1, &screen_vao);
  1779→    glGenBuffers(1, &screen_vbo);
  1780→
  1781→    glBindVertexArray(screen_vao);
  1782→    glBindBuffer(GL_ARRAY_BUFFER, screen_vbo);
  1783→    glBufferData(GL_ARRAY_BUFFER, sizeof(screen_vertices), screen_vertices, GL_STATIC_DRAW);
  1784→
  1785→    // Position attribute (location 0): 2 floats
  1786→    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
  1787→    glEnableVertexAttribArray(0);
  1788→
  1789→    // TexCoord attribute (location 1): 2 floats
  1790→    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
  1791→    glEnableVertexAttribArray(1);
  1792→
  1793→    glBindVertexArray(0);
  1794→    printf("Screen VAO/VBO created\n");
  1795→
  1796→    // Initialize Lua
  1797→    L = luaL_newstate();
  1798→    if (!L) {
  1799→        fprintf(stderr, "luaL_newstate failed\n");
... [30 more lines]

No matches found

276:// Reset effect state for start of frame (call after layer_flush, before new frame)
614:static void process_rectangle(const DrawCommand* cmd) {
791:                process_rectangle(cmd);

[Showing results with pagination = limit: 20, offset: 0]

780→            current_blend = cmd->blend_mode;
   781→            apply_blend_mode(current_blend);
   782→        }
   783→
   784→        switch (cmd->type) {
   785→            case SHAPE_RECTANGLE:
   786→                // SDF shapes use no texture - flush if we were drawing sprites
   787→                if (current_batch_texture != 0 && batch_vertex_count > 0) {
   788→                    batch_flush();
   789→                    current_batch_texture = 0;
   790→                }
   791→                process_rectangle(cmd);
   792→                break;
   793→            case SHAPE_CIRCLE:
   794→                // SDF shapes use no texture - flush if we were drawing sprites
   795→                if (current_batch_texture != 0 && batch_vertex_count > 0) {
   796→                    batch_flush();
   797→                    current_batch_texture = 0;
   798→                }
   799→                process_circle(cmd);
   800→                break;
   801→            case SHAPE_SPRITE:
   802→                process_sprite(cmd);
   803→                break;
   804→        }
   805→
   806→        // Flush if batch is getting full
   807→        if (batch_vertex_count >= MAX_BATCH_VERTICES - 6) {
   808→            batch_flush();
   809→        }
... [30 more lines]

755→            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   756→            break;
   757→        case BLEND_ADDITIVE:
   758→            // Additive blending: result = src * src.a + dst (good for glows, particles)
   759→            glBlendFunc(GL_SRC_ALPHA, GL_ONE);
   760→            break;
   761→    }
   762→}
   763→
   764→// Render all commands on a layer
   765→static void layer_render(Layer* layer) {
   766→    batch_vertex_count = 0;
   767→    current_batch_texture = 0;
   768→    uint8_t current_blend = BLEND_ALPHA;  // Start with default
   769→    apply_blend_mode(current_blend);
   770→
   771→    for (int i = 0; i < layer->command_count; i++) {
   772→        const DrawCommand* cmd = &layer->commands[i];
   773→
   774→        // Check for blend mode change
   775→        if (cmd->blend_mode != current_blend && batch_vertex_count > 0) {
   776→            batch_flush();
   777→            current_blend = cmd->blend_mode;
   778→            apply_blend_mode(current_blend);
   779→        } else if (cmd->blend_mode != current_blend) {
   780→            current_blend = cmd->blend_mode;
   781→            apply_blend_mode(current_blend);
   782→        }
   783→
   784→        switch (cmd->type) {

765:static void layer_render(Layer* layer) {
1575:            layer_render(layer);

1565→            glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
  1566→            glViewport(0, 0, layer->width, layer->height);
  1567→
  1568→            if (error_state) {
  1569→                glClearColor(0.3f, 0.1f, 0.1f, 1.0f);  // Dark red for error
  1570→            } else {
  1571→                glClearColor(0.0f, 0.0f, 0.0f, 0.0f);  // Transparent black
  1572→            }
  1573→            glClear(GL_COLOR_BUFFER_BIT);
  1574→
  1575→            layer_render(layer);
  1576→        }
  1577→
  1578→        // === PASS 2: Composite all layers to screen ===
  1579→        glBindFramebuffer(GL_FRAMEBUFFER, 0);
  1580→
  1581→        // Get current window size
  1582→        int window_w, window_h;
  1583→        SDL_GetWindowSize(window, &window_w, &window_h);
  1584→
  1585→        // Calculate scale to fit window while maintaining aspect ratio
  1586→        // Use integer scaling for pixel-perfect rendering
  1587→        float scale_x = (float)window_w / GAME_WIDTH;
  1588→        float scale_y = (float)window_h / GAME_HEIGHT;
  1589→        float scale = (scale_x < scale_y) ? scale_x : scale_y;
  1590→        int int_scale = (int)scale;
  1591→        if (int_scale < 1) int_scale = 1;
  1592→
  1593→        // Calculate centered position with letterboxing
  1594→        int scaled_w = GAME_WIDTH * int_scale;
... [5 more lines]

524→static char* layer_names[MAX_LAYERS];
   525→static int layer_count = 0;
   526→
   527→// Screen blit resources
   528→static GLuint screen_shader = 0;
   529→static GLuint screen_vao = 0;
   530→static GLuint screen_vbo = 0;
   531→
   532→// Apply a shader to a layer (ping-pong)
   533→// Renders current result through shader to alternate buffer, then swaps
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→
   537→    // Ensure effect buffer exists
   538→    layer_ensure_effect_buffer(layer);
   539→
   540→    // Determine source and destination based on current state
   541→    GLuint src_tex, dst_fbo;
   542→    if (layer->textures_swapped) {
   543→        // Current result is in effect_texture, render to color_texture
   544→        src_tex = layer->effect_texture;
   545→        dst_fbo = layer->fbo;
   546→    } else {
   547→        // Current result is in color_texture, render to effect_texture
   548→        src_tex = layer->color_texture;
   549→        dst_fbo = layer->effect_fbo;
   550→    }
   551→
   552→    // Bind destination FBO
   553→    glBindFramebuffer(GL_FRAMEBUFFER, dst_fbo);
... [30 more lines]

750→// Apply GL blend state based on blend mode
   751→static void apply_blend_mode(uint8_t mode) {
   752→    switch (mode) {
   753→        case BLEND_ALPHA:
   754→            // Standard alpha blending: result = src * src.a + dst * (1 - src.a)
   755→            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   756→            break;
   757→        case BLEND_ADDITIVE:
   758→            // Additive blending: result = src * src.a + dst (good for glows, particles)
   759→            glBlendFunc(GL_SRC_ALPHA, GL_ONE);
   760→            break;
   761→    }
   762→}
   763→
   764→// Render all commands on a layer
   765→static void layer_render(Layer* layer) {
   766→    batch_vertex_count = 0;
   767→    current_batch_texture = 0;
   768→    uint8_t current_blend = BLEND_ALPHA;  // Start with default
   769→    apply_blend_mode(current_blend);
   770→
   771→    for (int i = 0; i < layer->command_count; i++) {
   772→        const DrawCommand* cmd = &layer->commands[i];
   773→
   774→        // Check for blend mode change
   775→        if (cmd->blend_mode != current_blend && batch_vertex_count > 0) {
   776→            batch_flush();
   777→            current_blend = cmd->blend_mode;
   778→            apply_blend_mode(current_blend);
   779→        } else if (cmd->blend_mode != current_blend) {
... [50 more lines]

1442:static void main_loop_iteration(void) {
1575:            layer_render(layer);
1850:    emscripten_set_main_loop(main_loop_iteration, 0, 1);
1854:        main_loop_iteration();

1540→        frame++;
  1541→
  1542→        // Set up orthographic projection (game coordinates)
  1543→        // Maps (0,0) at top-left to (width, height) at bottom-right
  1544→        float projection[16] = {
  1545→            2.0f / GAME_WIDTH, 0.0f, 0.0f, 0.0f,
  1546→            0.0f, -2.0f / GAME_HEIGHT, 0.0f, 0.0f,
  1547→            0.0f, 0.0f, -1.0f, 0.0f,
  1548→            -1.0f, 1.0f, 0.0f, 1.0f
  1549→        };
  1550→
  1551→        glUseProgram(shader_program);
  1552→        GLint proj_loc = glGetUniformLocation(shader_program, "projection");
  1553→        glUniformMatrix4fv(proj_loc, 1, GL_FALSE, projection);
  1554→
  1555→        // Set AA width based on filter mode (0 = rough/hard edges, 1 = smooth)
  1556→        GLint aa_loc = glGetUniformLocation(shader_program, "u_aa_width");
  1557→        float aa_width = (shape_filter_mode == FILTER_SMOOTH) ? 1.0f : 0.0f;
  1558→        glUniform1f(aa_loc, aa_width);
  1559→
  1560→        // === PASS 1: Render each layer to its FBO ===
  1561→        glBindTexture(GL_TEXTURE_2D, 0);  // Unbind to avoid feedback loop
  1562→
  1563→        for (int i = 0; i < layer_count; i++) {
  1564→            Layer* layer = layer_registry[i];
  1565→            glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
  1566→            glViewport(0, 0, layer->width, layer->height);
  1567→
  1568→            if (error_state) {
  1569→                glClearColor(0.3f, 0.1f, 0.1f, 1.0f);  // Dark red for error
... [30 more lines]

267-    glBindFramebuffer(GL_FRAMEBUFFER, 0);
268-    glBindTexture(GL_TEXTURE_2D, 0);
269-}
270-
271-// Get the current result texture (accounts for ping-pong state)
272:static GLuint layer_get_texture(Layer* layer) {
273-    return layer->textures_swapped ? layer->effect_texture : layer->color_texture;
274-}
275-
276-// Reset effect state for start of frame (call after layer_flush, before new frame)
277-static void layer_reset_effects(Layer* layer) {
--
1059-    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
1060-    layer_apply_shader(layer, shader);
1061-    return 0;
1062-}
1063-
1064:static int l_layer_get_texture(lua_State* L) {
1065-    Layer* layer = (Layer*)lua_touserdata(L, 1);
1066:    GLuint tex = layer_get_texture(layer);
1067-    lua_pushinteger(L, (lua_Integer)tex);
1068-    return 1;
1069-}
1070-
1071-static int l_layer_reset_effects(lua_State* L) {
--
1097-    lua_register(L, "shader_set_vec4", l_shader_set_vec4);
1098-    lua_register(L, "shader_set_int", l_shader_set_int);
1099-    lua_register(L, "shader_set_texture", l_shader_set_texture);
1100-    // Layer effects
... [20 more lines]

530→static GLuint screen_vbo = 0;
   531→
   532→// Apply a shader to a layer (ping-pong)
   533→// Renders current result through shader to alternate buffer, then swaps
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→
   537→    // Ensure effect buffer exists
   538→    layer_ensure_effect_buffer(layer);
   539→
   540→    // Determine source and destination based on current state
   541→    GLuint src_tex, dst_fbo;
   542→    if (layer->textures_swapped) {
   543→        // Current result is in effect_texture, render to color_texture
   544→        src_tex = layer->effect_texture;
   545→        dst_fbo = layer->fbo;
   546→    } else {
   547→        // Current result is in color_texture, render to effect_texture
   548→        src_tex = layer->color_texture;
   549→        dst_fbo = layer->effect_fbo;
   550→    }
   551→
   552→    // Bind destination FBO
   553→    glBindFramebuffer(GL_FRAMEBUFFER, dst_fbo);
   554→    glViewport(0, 0, layer->width, layer->height);
   555→
   556→    // Clear destination
   557→    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
   558→    glClear(GL_COLOR_BUFFER_BIT);
   559→
... [40 more lines]

38:#define GAME_WIDTH 480
39:#define GAME_HEIGHT 270
378:static int shape_filter_mode = FILTER_SMOOTH;
517:static GLuint shader_program = 0;
834:    Layer* layer = layer_create(GAME_WIDTH, GAME_HEIGHT);
904:        shape_filter_mode = FILTER_SMOOTH;
906:        shape_filter_mode = FILTER_ROUGH;
1545:            2.0f / GAME_WIDTH, 0.0f, 0.0f, 0.0f,
1546:            0.0f, -2.0f / GAME_HEIGHT, 0.0f, 0.0f,
1557:        float aa_width = (shape_filter_mode == FILTER_SMOOTH) ? 1.0f : 0.0f;
1587:        float scale_x = (float)window_w / GAME_WIDTH;
1588:        float scale_y = (float)window_h / GAME_HEIGHT;
1594:        int scaled_w = GAME_WIDTH * int_scale;
1595:        int scaled_h = GAME_HEIGHT * int_scale;
1673:        GAME_WIDTH * INITIAL_SCALE, GAME_HEIGHT * INITIAL_SCALE,

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   528→static GLuint screen_shader = 0;
   529→static GLuint screen_vao = 0;
   530→static GLuint screen_vbo = 0;
   531→
   532→// Apply a shader to a layer (ping-pong)
   533→// Renders current result through shader to alternate buffer, then swaps
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→
   537→    // Ensure effect buffer exists
   538→    layer_ensure_effect_buffer(layer);
   539→
   540→    // Determine source and destination based on current state
   541→    GLuint src_fbo, src_tex, dst_fbo;
   542→    if (layer->textures_swapped) {
   543→        // Current result is in effect_texture, render to color_texture
   544→        src_fbo = layer->effect_fbo;
   545→        src_tex = layer->effect_texture;
   546→        dst_fbo = layer->fbo;
   547→    } else {
   548→        // Current result is in color_texture, render to effect_texture
   549→        src_fbo = layer->fbo;
   550→        src_tex = layer->color_texture;
   551→        dst_fbo = layer->effect_fbo;
   552→    }
   553→
   554→    // If there are pending draw commands, flush them to the source texture first
   555→    if (layer->command_count > 0) {
   556→        // Set up orthographic projection (same as main loop)
... [69 more lines]

Exit code 127
/usr/bin/bash: line 1: ./build.bat: No such file or directory

Exit code 1
'build.bat' is not recognized as an internal or external command,
operable program or batch file.

E:\a327ex\Anchor\reference\super emoji box\tools\build_for_windows.lua
E:\a327ex\Anchor\reference\love-compare\tools\build_for_windows.lua
E:\a327ex\Anchor\engine\build.bat
E:\a327ex\Anchor\engine\build-web.sh
E:\a327ex\Anchor\tools\build.bat

Exit code 1
'build.bat' is not recognized as an internal or external command,
operable program or batch file.

total 1457
drwxr-xr-x 1 adn 197121       0 Jan  8 09:30 ./
drwxr-xr-x 1 adn 197121       0 Jan  7 19:51 ../
-rw-r--r-- 1 adn 197121  376053 Jan  8 09:30 anchor.obj
drwxr-xr-x 1 adn 197121       0 Jan  5 08:34 build/
-rw-r--r-- 1 adn 197121    2974 Jan  5 08:33 build.bat
drwxr-xr-x 1 adn 197121       0 Jan  7 19:21 build-web/
-rwxr-xr-x 1 adn 197121    1602 Jan  7 19:21 build-web.sh*
drwxr-xr-x 1 adn 197121       0 Jan  7 08:25 docs/
-rw-r--r-- 1 adn 197121 1086628 Jan  8 09:30 gl.obj
drwxr-xr-x 1 adn 197121       0 Jan  5 07:58 include/
drwxr-xr-x 1 adn 197121       0 Jan  5 08:32 lib/
-rw-r--r-- 1 adn 197121     101 Jan  6 13:22 run-web.bat
-rw-r--r-- 1 adn 197121    3470 Jan  6 13:09 shell.html
drwxr-xr-x 1 adn 197121       0 Jan  8 09:46 src/
@echo off
setlocal

cd /d "%~dp0"

:: Find and run vcvarsall.bat for Visual Studio
if exist "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" (
    call "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" (
    call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" (
    call "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" (
    call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
) else (
... [5 more lines]

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). To tell you how to proceed, the user said:
Read CLAUDE.md, maybe it has build instructions?

1→# CLAUDE.md
     2→
     3→Guidelines for Claude Code instances working on Anchor and games built with it.
     4→
     5→---
     6→
     7→## Read First
     8→
     9→Read `docs/ANCHOR.md` before doing anything. It covers:
    10→- The object tree model (tree-based ownership, automatic cleanup)
    11→- How objects, timers, springs, and colliders work
    12→- The action-based vs rules-based spectrum
    13→- Technical implementation details (OpenGL rendering, Box2D physics)
    14→
    15→**For the reasoning behind these decisions** — why the engine works the way it does, how to evaluate new features, the developer's working style — see the [Anchor Context Brief](#anchor-context-brief) at the end of this document.
    16→
    17→---
    18→
    19→## Session Workflow
    20→
    21→**Every Claude Code session follows this workflow.**
    22→
    23→### During Session
    24→
    25→- Work normally on requested tasks
    26→- Update `docs/ANCHOR.md` when APIs or architecture changes
    27→- Update `docs/ANCHOR_IMPLEMENTATION_PLAN.md` when tasks are completed
    28→- Update this file (`CLAUDE.md`) when new patterns or conventions are established
    29→
    30→### End of Session
... [70 more lines]

E:\a327ex\Anchor\docs\ANCHOR.md:21:13. [Build and Distribution](#build-and-distribution)
E:\a327ex\Anchor\docs\ANCHOR.md:441:| `^` | set/build | Assign properties (table) or run init code (function) |
E:\a327ex\Anchor\docs\ANCHOR.md:527:### The `^` Operator: Set and Build
E:\a327ex\Anchor\docs\ANCHOR.md:536:**With a function** — runs immediately (build/init):
E:\a327ex\Anchor\docs\ANCHOR.md:767:*YueScript (evolved from MoonScript) is a language that compiles to Lua. It offers significant syntactic improvements: significant whitespace, `@` for self, `=>` for methods with implicit self, no `end` keywords, `+=`/`-=` operators, and optional parentheses. The operator-based object construction style fits YueScript's aesthetic particularly well.*
E:\a327ex\Anchor\docs\ANCHOR.md:819:**With build function:**
E:\a327ex\Anchor\docs\ANCHOR.md:847:        -- build polyline using * iteration
E:\a327ex\Anchor\docs\ANCHOR.md:1256:- **Language:** C99 with Lua 5.4 scripting (YueScript compiled to Lua)
E:\a327ex\Anchor\docs\ANCHOR.md:1419:## Build and Distribution
E:\a327ex\Anchor\docs\ANCHOR.md:1425:### Build Scripts
E:\a327ex\Anchor\docs\ANCHOR.md:1427:- **Windows:** `build.bat` — compiles anchor.c, links against static libraries
E:\a327ex\Anchor\docs\ANCHOR.md:1428:- **Web:** `build-web.bat` (Emscripten)
E:\a327ex\Anchor\docs\ANCHOR.md:1429:- **Dependencies:** CMake used to build SDL2 as a static library (one-time setup)
E:\a327ex\Anchor\docs\ANCHOR.md:1435:- **Lua** — compiled directly into the engine
E:\a327ex\Anchor\docs\ANCHOR.md:1442:**Packaging method:** Zip-append. Game content (Lua files, assets) is packed into a zip archive and appended to the executable. The engine reads itself, finds the zip at the end, and loads content from there. Standard zip tools (7-Zip, WinRAR) can open the exe and extract content. During development, content loads from disk; release builds use the appended zip.
E:\a327ex\Anchor\docs\ANCHOR.md:1452:├── engine/                 # Engine code + builds
E:\a327ex\Anchor\docs\ANCHOR.md:1457:│   ├── build/              # Windows build output (anchor.exe)
E:\a327ex\Anchor\docs\ANCHOR.md:1458:│   ├── build-web/          # Web build output (anchor.html, etc.)
E:\a327ex\Anchor\docs\ANCHOR.md:1459:│   ├── build.bat           # Windows build script
E:\a327ex\Anchor\docs\ANCHOR.md:1460:│   ├── build-web.sh        # Web build script (takes game folder arg)
E:\a327ex\Anchor\docs\ANCHOR.md:1461:│   ├── run-web.bat         # Run web build locally
E:\a327ex\Anchor\docs\ANCHOR.md:1479:./engine/build/anchor.exe test
E:\a327ex\Anchor\docs\ANCHOR.md:1481:# Web (bundles game folder at build time)
E:\a327ex\Anchor\docs\ANCHOR.md:1482:./engine/build-web.sh ../test
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:14:| Scripting | Lua 5.4 + YueScript | Build-time compilation with `-r` flag for line numbers |
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:19:| Linking | Static | No DLLs; SDL2, Lua, audio all compiled in |
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:24:## Build Strategy
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:28:**Build-time compilation** — compile `.yue` → `.lua` during build, not at runtime.
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:42:├── engine/                 # Engine code + builds
E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md:47:│   ├── build/              # Windows build output (anchor.exe)
... [40 more lines]

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). STOP what you are doing and wait for the user to tell you how to proceed.

200-4. Then proceed
201-
202-Once trust is established, this shifts to larger tasks.
203-
204-### Wait for User Before Next Task
205-
206-After completing a task, **always give the user a turn** before starting the next one. Don't chain tasks together autonomously — the user may want to test, adjust, or redirect.
207-
208:### Build Only, Don't Run
209-
210-**Only build things, never run them.** The user will run builds and tests themselves. Don't execute `build.bat`, `run-web.bat`, or similar commands unless explicitly asked.
211-
212-### Build Order
213-
214-1. Get moment-to-moment gameplay working first (physics, core mechanics)
215-2. Then surrounding systems (metagame, UI, progression)
216-3. Polish and juice come throughout, not as a final phase

799:static void layer_render(Layer* layer) {

881-}
882-
883-// Forward declarations for effect shader functions (defined after shader sources)
884:static GLuint effect_shader_load_file(const char* path);
885-static GLuint effect_shader_load_string(const char* frag_source);
886-static void effect_shader_destroy(GLuint shader);
887-static void shader_set_float(GLuint shader, const char* name, float value);
--
1390-}
1391-
1392-// Create an effect shader program from a fragment shader file
1393:static GLuint effect_shader_load_file(const char* path) {
1394-    char* source = read_file_to_string(path);
1395-    if (!source) return 0;
1396-    GLuint shader = effect_shader_load_string(source);

880→    return layer;
   881→}
   882→
   883→// Forward declarations for effect shader functions (defined after shader sources)
   884→static GLuint effect_shader_load_file(const char* path);
   885→static GLuint effect_shader_load_string(const char* frag_source);
   886→static void effect_shader_destroy(GLuint shader);
   887→static void shader_set_float(GLuint shader, const char* name, float value);
   888→static void shader_set_vec2(GLuint shader, const char* name, float x, float y);
   889→static void shader_set_vec4(GLuint shader, const char* name, float x, float y, float z, float w);
   890→static void shader_set_int(GLuint shader, const char* name, int value);
   891→static void shader_set_texture(GLuint shader, const char* name, GLuint texture, int unit);
   892→
   893→// Lua bindings
   894→static int l_layer_create(lua_State* L) {

515→
   516→// Rendering state
   517→static GLuint shader_program = 0;
   518→static GLuint vao = 0;
   519→static GLuint vbo = 0;
   520→
   521→// Layer registry
   522→#define MAX_LAYERS 16
   523→static Layer* layer_registry[MAX_LAYERS];
   524→static char* layer_names[MAX_LAYERS];
   525→static int layer_count = 0;
   526→
   527→// Screen blit resources
   528→static GLuint screen_shader = 0;
   529→static GLuint screen_vao = 0;
   530→static GLuint screen_vbo = 0;
   531→
   532→// Apply a shader to a layer (ping-pong)
   533→// Renders current result through shader to alternate buffer, then swaps
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→
   537→    // Ensure effect buffer exists
   538→    layer_ensure_effect_buffer(layer);
   539→

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   523→static Layer* layer_registry[MAX_LAYERS];
   524→static char* layer_names[MAX_LAYERS];
   525→static int layer_count = 0;
   526→
   527→// Screen blit resources
   528→static GLuint screen_shader = 0;
   529→static GLuint screen_vao = 0;
   530→static GLuint screen_vbo = 0;
   531→
   532→// Forward declaration (layer_render defined later, needed by layer_apply_shader)
   533→static void layer_render(Layer* layer);
   534→
   535→// Apply a shader to a layer (ping-pong)
   536→// Renders current result through shader to alternate buffer, then swaps
   537→static void layer_apply_shader(Layer* layer, GLuint shader) {
   538→    if (!shader) return;
   539→

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). STOP what you are doing and wait for the user to tell you how to proceed.

63:    SHAPE_RECTANGLE = 0,
64:    SHAPE_CIRCLE,
65:    SHAPE_SPRITE,
74:// DrawCommand — stores one deferred draw call
82:    uint8_t type;           // SHAPE_RECTANGLE, SHAPE_CIRCLE, SHAPE_SPRITE
98:} DrawCommand;
100:// Verify DrawCommand is exactly 64 bytes (compile-time check)
102:    static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
104:    _Static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
126:    DrawCommand* commands;
196:    layer->commands = (DrawCommand*)malloc(MAX_COMMAND_CAPACITY * sizeof(DrawCommand));
286:// Copy current transform to a 2x3 array (for DrawCommand)
296:static DrawCommand* layer_add_command(Layer* layer) {
309:    DrawCommand* cmd = &layer->commands[layer->command_count++];
310:    memset(cmd, 0, sizeof(DrawCommand));
323:    DrawCommand* cmd = layer_add_command(layer);
325:    cmd->type = SHAPE_RECTANGLE;
335:    DrawCommand* cmd = layer_add_command(layer);
337:    cmd->type = SHAPE_CIRCLE;
347:    DrawCommand* cmd = layer_add_command(layer);
349:    cmd->type = SHAPE_SPRITE;
651:static void process_rectangle(const DrawCommand* cmd) {
699:static void process_circle(const DrawCommand* cmd) {
741:static void process_sprite(const DrawCommand* cmd) {
809:        const DrawCommand* cmd = &layer->commands[i];
822:            case SHAPE_RECTANGLE:
830:            case SHAPE_CIRCLE:
838:            case SHAPE_SPRITE:

60→
    61→// Shape types
    62→enum {
    63→    SHAPE_RECTANGLE = 0,
    64→    SHAPE_CIRCLE,
    65→    SHAPE_SPRITE,
    66→};
    67→
    68→// Blend modes
    69→enum {
    70→    BLEND_ALPHA = 0,
    71→    BLEND_ADDITIVE,
    72→};
    73→
    74→// DrawCommand — stores one deferred draw call
    75→// Explicitly padded to 64 bytes for consistent memory layout across platforms
    76→//
    77→// Coordinate conventions:
    78→//   RECTANGLE: x,y is top-left corner, w,h extend right and down (matches SDL/LÖVE)
    79→//   CIRCLE: x,y is center, radius extends outward
    80→//   SPRITE: x,y is center (texture drawn centered at that point)
    81→typedef struct {
    82→    uint8_t type;           // SHAPE_RECTANGLE, SHAPE_CIRCLE, SHAPE_SPRITE
    83→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    84→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    85→
    86→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
    87→    uint32_t color;         // Packed RGBA for multiply/tint (4 bytes)
    88→
    89→    // Shape parameters (meaning depends on type)
... [20 more lines]

535→// Apply a shader to a layer (ping-pong)
   536→// Renders current result through shader to alternate buffer, then swaps
   537→static void layer_apply_shader(Layer* layer, GLuint shader) {
   538→    if (!shader) return;
   539→
   540→    // Ensure effect buffer exists
   541→    layer_ensure_effect_buffer(layer);
   542→
   543→    // Determine source and destination based on current state
   544→    GLuint src_fbo, src_tex, dst_fbo;
   545→    if (layer->textures_swapped) {
   546→        // Current result is in effect_texture, render to color_texture
   547→        src_fbo = layer->effect_fbo;
   548→        src_tex = layer->effect_texture;
   549→        dst_fbo = layer->fbo;
   550→    } else {
   551→        // Current result is in color_texture, render to effect_texture
   552→        src_fbo = layer->fbo;
   553→        src_tex = layer->color_texture;
   554→        dst_fbo = layer->effect_fbo;
   555→    }
   556→
   557→    // If there are pending draw commands, flush them to the source texture first
   558→    if (layer->command_count > 0) {
   559→        // Set up orthographic projection (same as main loop)
   560→        float projection[16] = {
   561→            2.0f / GAME_WIDTH, 0.0f, 0.0f, 0.0f,
   562→            0.0f, -2.0f / GAME_HEIGHT, 0.0f, 0.0f,
   563→            0.0f, 0.0f, -1.0f, 0.0f,
   564→            -1.0f, 1.0f, 0.0f, 1.0f
... [70 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    57→// Command queue capacity (fixed size, allocated once)
    58→// 16384 commands × ~64 bytes = ~1MB per layer
    59→#define MAX_COMMAND_CAPACITY 16384
    60→
    61→// Command types
    62→enum {
    63→    COMMAND_RECTANGLE = 0,
    64→    COMMAND_CIRCLE,
    65→    COMMAND_SPRITE,
    66→    COMMAND_APPLY_SHADER,  // Post-process layer through a shader
    67→};
    68→
    69→// Blend modes
    70→enum {
    71→    BLEND_ALPHA = 0,

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. All occurrences of 'SHAPE_SPRITE' were successfully replaced with 'COMMAND_SPRITE'.

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    79→//   RECTANGLE: x,y is top-left corner, w,h extend right and down (matches SDL/LÖVE)
    80→//   CIRCLE: x,y is center, radius extends outward
    81→//   SPRITE: x,y is center (texture drawn centered at that point)
    82→typedef struct {
    83→    uint8_t type;           // COMMAND_RECTANGLE, COMMAND_CIRCLE, COMMAND_SPRITE, COMMAND_APPLY_SHADER
    84→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    85→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    86→
    87→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    92→    // CIRCLE: params[0]=x, [1]=y, [2]=radius
    93→    // SPRITE: params[0]=x, [1]=y, [2]=w, [3]=h, [4]=ox, [5]=oy (+ texture_id)
    94→    float params[6];        // 24 bytes (reduced from 8 to fit 64-byte target)
    95→
    96→    GLuint texture_id;      // For SPRITE: texture handle; For APPLY_SHADER: shader handle (4 bytes)
    97→    uint32_t flash_color;   // Packed RGB for additive flash (uses only RGB, alpha ignored)
    98→    // Total: 4 + 24 + 4 + 24 + 4 + 4 = 64 bytes
    99→} DrawCommand;
   100→

530→static GLuint screen_vao = 0;
   531→static GLuint screen_vbo = 0;
   532→
   533→// Forward declaration (layer_render defined later, needed by layer_apply_shader)
   534→static void layer_render(Layer* layer);
   535→
   536→// Apply a shader to a layer (ping-pong)
   537→// Renders current result through shader to alternate buffer, then swaps
   538→static void layer_apply_shader(Layer* layer, GLuint shader) {
   539→    if (!shader) return;
   540→
   541→    // Ensure effect buffer exists
   542→    layer_ensure_effect_buffer(layer);
   543→
   544→    // Determine source and destination based on current state
   545→    GLuint src_fbo, src_tex, dst_fbo;
   546→    if (layer->textures_swapped) {
   547→        // Current result is in effect_texture, render to color_texture
   548→        src_fbo = layer->effect_fbo;
   549→        src_tex = layer->effect_texture;
   550→        dst_fbo = layer->fbo;
   551→    } else {
   552→        // Current result is in color_texture, render to effect_texture
   553→        src_fbo = layer->fbo;
   554→        src_tex = layer->color_texture;
   555→        dst_fbo = layer->effect_fbo;
   556→    }
   557→
   558→    // If there are pending draw commands, flush them to the source texture first
   559→    if (layer->command_count > 0) {
... [70 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   529→static GLuint screen_shader = 0;
   530→static GLuint screen_vao = 0;
   531→static GLuint screen_vbo = 0;
   532→
   533→// Queue a shader application command (deferred - actual work done at frame end)
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→    if (layer->command_count >= MAX_COMMAND_CAPACITY) return;
   537→
   538→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   539→    memset(cmd, 0, sizeof(DrawCommand));
   540→    cmd->type = COMMAND_APPLY_SHADER;
   541→    cmd->texture_id = shader;  // Reuse texture_id field for shader handle
   542→}
   543→
   544→// Execute shader application (ping-pong): read from current buffer, apply shader, write to alternate
   545→// Called during command processing when COMMAND_APPLY_SHADER is encountered
   546→static void execute_apply_shader(Layer* layer, GLuint shader) {
   547→    // Ensure effect buffer exists
   548→    layer_ensure_effect_buffer(layer);
   549→
   550→    // Determine source and destination based on current state
   551→    GLuint src_tex, dst_fbo;
   552→    if (layer->textures_swapped) {
   553→        src_tex = layer->effect_texture;
   554→        dst_fbo = layer->fbo;
   555→    } else {
   556→        src_tex = layer->color_texture;
   557→        dst_fbo = layer->effect_fbo;
... [39 more lines]

765→            break;
   766→    }
   767→}
   768→
   769→// Render all commands on a layer
   770→static void layer_render(Layer* layer) {
   771→    batch_vertex_count = 0;
   772→    current_batch_texture = 0;
   773→    uint8_t current_blend = BLEND_ALPHA;  // Start with default
   774→    apply_blend_mode(current_blend);
   775→
   776→    for (int i = 0; i < layer->command_count; i++) {
   777→        const DrawCommand* cmd = &layer->commands[i];
   778→
   779→        // Check for blend mode change
   780→        if (cmd->blend_mode != current_blend && batch_vertex_count > 0) {
   781→            batch_flush();
   782→            current_blend = cmd->blend_mode;
   783→            apply_blend_mode(current_blend);
   784→        } else if (cmd->blend_mode != current_blend) {
   785→            current_blend = cmd->blend_mode;
   786→            apply_blend_mode(current_blend);
   787→        }
   788→
   789→        switch (cmd->type) {
   790→            case COMMAND_RECTANGLE:
   791→                // SDF shapes use no texture - flush if we were drawing sprites
   792→                if (current_batch_texture != 0 && batch_vertex_count > 0) {
   793→                    batch_flush();
   794→                    current_batch_texture = 0;
... [40 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   765→            break;
   766→    }
   767→}
   768→
   769→// Render all commands on a layer
   770→// Note: Caller must have set up projection matrix and bound initial FBO before calling
   771→static void layer_render(Layer* layer) {
   772→    batch_vertex_count = 0;
   773→    current_batch_texture = 0;
   774→    uint8_t current_blend = BLEND_ALPHA;  // Start with default
   775→    apply_blend_mode(current_blend);
   776→
   777→    for (int i = 0; i < layer->command_count; i++) {
   778→        const DrawCommand* cmd = &layer->commands[i];
   779→
   780→        // Handle shader application command
   781→        if (cmd->type == COMMAND_APPLY_SHADER) {
   782→            // Flush pending draw commands before shader application
   783→            batch_flush();
   784→            current_batch_texture = 0;
   785→
   786→            // Execute the shader (ping-pong to alternate buffer)
   787→            execute_apply_shader(layer, cmd->texture_id);
   788→
   789→            // After ping-pong, bind the NEW current FBO for subsequent draws
   790→            // (execute_apply_shader toggled textures_swapped, so current is now the destination)
   791→            GLuint current_fbo = layer->textures_swapped ? layer->effect_fbo : layer->fbo;
   792→            glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
   793→            glViewport(0, 0, layer->width, layer->height);
... [57 more lines]

1589:        // === PASS 1: Render each layer to its FBO ===
1590-        glBindTexture(GL_TEXTURE_2D, 0);  // Unbind to avoid feedback loop
1591-
1592-        for (int i = 0; i < layer_count; i++) {
1593-            Layer* layer = layer_registry[i];
1594-            glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
1595-            glViewport(0, 0, layer->width, layer->height);
1596-
1597-            if (error_state) {
1598-                glClearColor(0.3f, 0.1f, 0.1f, 1.0f);  // Dark red for error
1599-            } else {
1600-                glClearColor(0.0f, 0.0f, 0.0f, 0.0f);  // Transparent black
1601-            }
1602-            glClear(GL_COLOR_BUFFER_BIT);
1603-
1604-            layer_render(layer);

anchor.c
src/anchor.c(871): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
gl.c
Generating Code...
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
Build successful: build/anchor.exe

195→
   196→Don't build large systems autonomously. Instead:
   197→1. Complete one small piece
   198→2. Show it / let them test it
   199→3. Get feedback
   200→4. Then proceed
   201→
   202→Once trust is established, this shifts to larger tasks.
   203→
   204→### Wait for User Before Next Task
   205→
   206→After completing a task, **always give the user a turn** before starting the next one. Don't chain tasks together autonomously — the user may want to test, adjust, or redirect.
   207→
   208→### Build Only, Don't Run
   209→
   210→**Only build things, never run them.** The user will run builds and tests themselves. Don't execute `build.bat`, `run-web.bat`, or similar commands unless explicitly asked.
   211→
   212→### Build Order
   213→
   214→1. Get moment-to-moment gameplay working first (physics, core mechanics)
   215→2. Then surrounding systems (metagame, UI, progression)
   216→3. Polish and juice come throughout, not as a final phase
   217→
   218→### Juice and Feel
   219→
   220→**Do not invent juice independently.** The developer has specific taste developed over years of frame-by-frame analysis.
   221→
   222→When implementing something that needs juice:
   223→- Ask what the juice should be
   224→- Implement the mechanical version first, let the developer add juice

The file E:\a327ex\Anchor\.claude\CLAUDE.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   204→### Wait for User Before Next Task
   205→
   206→After completing a task, **always give the user a turn** before starting the next one. Don't chain tasks together autonomously — the user may want to test, adjust, or redirect.
   207→
   208→### Always Build, Never Run
   209→
   210→**Always build the engine after making C code changes.** Use this command:
   211→```bash
   212→cd E:/a327ex/Anchor/engine && ./build.bat
   213→```
   214→
   215→**Never run the executable.** The user will run and test themselves. Don't execute `./build/anchor.exe`, `run-web.bat`, or similar run commands.
   216→
   217→### Build Order
   218→
   219→1. Get moment-to-moment gameplay working first (physics, core mechanics)

1→// Outline shader - TEST VERSION: outputs solid red to verify shader is applied
     2→in vec2 TexCoord;
     3→out vec4 FragColor;
     4→uniform sampler2D u_texture;
     5→uniform vec2 u_pixel_size;
     6→
     7→void main() {
     8→    // TEST: output solid red to verify shader is being applied
     9→    FragColor = vec4(1.0, 0.0, 0.0, 1.0);
    10→}
    11→

The file E:\a327ex\Anchor\test\shaders\outline.frag has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→// Outline shader - samples neighbors to detect alpha edges
     2→// Outputs black where any neighbor has alpha, creating silhouette outline
     3→in vec2 TexCoord;
     4→out vec4 FragColor;
     5→uniform sampler2D u_texture;
     6→uniform vec2 u_pixel_size;
     7→
     8→void main() {
     9→    // Sample center pixel
    10→    vec4 center = texture(u_texture, TexCoord);
    11→
    12→    // Sample 24 neighbors in 5x5 grid (excluding center)
    13→    float x = u_pixel_size.x;
    14→    float y = u_pixel_size.y;
    15→
    16→    float a = 0.0;
    17→    // Row -2
    18→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -2.0*y)).a;
    19→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -2.0*y)).a;
    20→    a += texture(u_texture, TexCoord + vec2( 0.0,   -2.0*y)).a;
    21→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -2.0*y)).a;
    22→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -2.0*y)).a;
    23→    // Row -1
    24→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -1.0*y)).a;
    25→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -1.0*y)).a;
    26→    a += texture(u_texture, TexCoord + vec2( 0.0,   -1.0*y)).a;
    27→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -1.0*y)).a;
    28→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -1.0*y)).a;
    29→    // Row 0 (skip center)
... [26 more lines]

1→print("main.lua loaded - Effects Test")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(231, 232, 233, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local outline_layer = layer_create('outline')
    12→local game_layer = layer_create('game')
    13→
    14→-- Load shaders
    15→local outline_shader = shader_load_file('shaders/outline.frag')
    16→print("Outline shader loaded: " .. tostring(outline_shader))
    17→
    18→-- Load textures
    19→local smile_tex = texture_load("assets/slight_smile.png")
    20→local star_tex = texture_load("assets/star.png")
    21→
    22→-- Target display sizes
    23→local smile_size = 36
    24→local star_size = 14
    25→
    26→-- Calculate scale factors (textures are 512x512)
    27→local smile_scale = smile_size / texture_get_width(smile_tex)
    28→local star_scale = star_size / texture_get_width(star_tex)
    29→
    30→-- HSV to RGB (h: 0-360, s: 0-1, v: 0-1)
... [132 more lines]

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    71→local star_spin_speed = 3.0
    72→
    73→local game_time = 0
    74→
    75→-- Helper to draw objects only (no background) - for outline layer
    76→local function draw_objects_only(layer)
    77→    -- Draw ball
    78→    local r, g, b = hsv_to_rgb(ball.hue, 1, 1)
    79→    layer_circle(layer, ball.x, ball.y, ball.radius, rgba(r, g, b, 255))
    80→
    81→    -- Draw emoji
    82→    layer_push(layer, emoji.x, emoji.y, emoji.rotation, smile_scale, smile_scale)
    83→        layer_draw_texture(layer, smile_tex, 0, 0)
    84→    layer_pop(layer)
    85→
    86→    -- Draw orbiting stars
    87→    for i = 0, num_stars - 1 do
    88→        local angle_offset = (i / num_stars) * math.pi * 2
    89→        local orbit_angle = game_time * orbit_speed + angle_offset
    90→        local star_spin = game_time * star_spin_speed * (i % 2 == 0 and 1 or -1)
    91→
    92→        layer_push(layer, emoji.x, emoji.y, orbit_angle, 1, 1)
    93→            layer_push(layer, orbit_radius, 0, star_spin, star_scale, star_scale)
    94→                layer_draw_texture(layer, star_tex, 0, 0)
    95→            layer_pop(layer)
    96→        layer_pop(layer)
    97→    end
    98→end
    99→
... [12 more lines]

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   152→        emoji.y = screen_h - half_h
   153→        emoji.vy = -emoji.vy
   154→    end
   155→
   156→    -- === Draw to both layers ===
   157→    -- Outline layer: objects only (no background) so outline shader can detect edges
   158→    draw_objects_only(outline_layer)
   159→    -- Game layer: background + objects (the actual visible content)
   160→    draw_scene(game_layer)
   161→
   162→    -- === Apply outline shader to outline layer ===
   163→    shader_set_vec2(outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   164→    layer_apply_shader(outline_layer, outline_shader)

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(231, 232, 233, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local bg_layer = layer_create('background')
    12→local outline_layer = layer_create('outline')
    13→local game_layer = layer_create('game')
    14→
    15→-- Load shaders
    16→local outline_shader = shader_load_file('shaders/outline.frag')
    17→print("Outline shader loaded: " .. tostring(outline_shader))

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   153→        emoji.y = screen_h - half_h
   154→        emoji.vy = -emoji.vy
   155→    end
   156→
   157→    -- === Draw to layers ===
   158→    -- Background layer: just the background color
   159→    layer_rectangle(bg_layer, 0, 0, screen_w, screen_h, bg_color)
   160→
   161→    -- Outline layer: objects only (no background) so outline shader can detect edges
   162→    draw_objects_only(outline_layer)
   163→
   164→    -- Game layer: objects only (transparent, drawn on top)
   165→    draw_objects_only(game_layer)
   166→
   167→    -- === Apply outline shader to outline layer ===
   168→    shader_set_vec2(outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   169→    layer_apply_shader(outline_layer, outline_shader)
   170→
   171→    -- Rendering order: bg_layer (background) -> outline_layer (black outlines) -> game_layer (actual sprites)
   172→end
   173→

1→// Shadow shader - creates a dark, semi-transparent silhouette
     2→// Draw this layer at an offset to create drop shadow effect
     3→
     4→in vec2 TexCoord;
     5→out vec4 FragColor;
     6→uniform sampler2D u_texture;
     7→
     8→void main() {
     9→    float a = texture(u_texture, TexCoord).a;
    10→    FragColor = vec4(0.1, 0.1, 0.1, a * 0.2);
    11→}
    12→

1→print("main.lua loaded - Effects Test")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(231, 232, 233, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local bg_layer = layer_create('background')
    12→local outline_layer = layer_create('outline')
    13→local game_layer = layer_create('game')
    14→
    15→-- Load shaders
    16→local outline_shader = shader_load_file('shaders/outline.frag')
    17→print("Outline shader loaded: " .. tostring(outline_shader))
    18→
    19→-- Load textures
    20→local smile_tex = texture_load("assets/slight_smile.png")
    21→local star_tex = texture_load("assets/star.png")
    22→
    23→-- Target display sizes
    24→local smile_size = 36
    25→local star_size = 14
    26→
    27→-- Calculate scale factors (textures are 512x512)
    28→local smile_scale = smile_size / texture_get_width(smile_tex)
    29→local star_scale = star_size / texture_get_width(star_tex)
    30→
... [134 more lines]

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     6→
     7→-- Background color from twitter_emoji theme (48, 49, 50)
     8→local bg_color = rgba(231, 232, 233, 255)
     9→
    10→-- Create layers (order matters: first = bottom, last = top)
    11→local bg_layer = layer_create('background')
    12→local shadow_layer = layer_create('shadow')
    13→local outline_layer = layer_create('outline')
    14→local game_layer = layer_create('game')
    15→
    16→-- Load shaders
    17→local shadow_shader = shader_load_file('shaders/shadow.frag')
    18→local outline_shader = shader_load_file('shaders/outline.frag')
    19→print("Shadow shader loaded: " .. tostring(shadow_shader))
    20→print("Outline shader loaded: " .. tostring(outline_shader))
    21→
    22→-- Shadow offset (pixels)
    23→local shadow_offset_x = 2
    24→local shadow_offset_y = 2
    25→
    26→-- Load textures
    27→local smile_tex = texture_load("assets/slight_smile.png")
    28→local star_tex = texture_load("assets/star.png")

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   151→        emoji.y = screen_h - half_h
   152→        emoji.vy = -emoji.vy
   153→    end
   154→
   155→    -- === Draw to layers ===
   156→    -- Background layer: just the background color
   157→    layer_rectangle(bg_layer, 0, 0, screen_w, screen_h, bg_color)
   158→
   159→    -- Shadow layer: objects drawn at offset, then shadow shader applied
   160→    layer_push(shadow_layer, shadow_offset_x, shadow_offset_y, 0, 1, 1)
   161→        draw_objects(shadow_layer)
   162→    layer_pop(shadow_layer)
   163→
   164→    -- Outline layer: objects only (no background) so outline shader can detect edges
   165→    draw_objects(outline_layer)
   166→
   167→    -- Game layer: objects only (transparent, drawn on top)
   168→    draw_objects(game_layer)
   169→
   170→    -- === Apply shaders ===
   171→    layer_apply_shader(shadow_layer, shadow_shader)
   172→
   173→    shader_set_vec2(outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   174→    layer_apply_shader(outline_layer, outline_shader)
   175→
   176→    -- Rendering order: bg_layer -> shadow_layer -> outline_layer -> game_layer
   177→end
   178→

1→// Shadow shader - creates a dark, semi-transparent silhouette
     2→// Draw this layer at an offset to create drop shadow effect
     3→
     4→in vec2 TexCoord;
     5→out vec4 FragColor;
     6→uniform sampler2D u_texture;
     7→
     8→void main() {
     9→    float a = texture(u_texture, TexCoord).a;
    10→    FragColor = vec4(0.5, 0.5, 0.5, a * 0.5);
    11→}
    12→

Building with game folder: ../test
Build successful: build-web/anchor.html
To test: cd build-web && python -m http.server 8000
Then open: http://localhost:8000/anchor.html

105→    _Static_assert(sizeof(DrawCommand) == 64, "DrawCommand must be 64 bytes");
   106→#endif
   107→
   108→// Layer
   109→typedef struct {
   110→    GLuint fbo;
   111→    GLuint color_texture;
   112→    int width;
   113→    int height;
   114→
   115→    // Effect ping-pong buffers (created on first use)
   116→    GLuint effect_fbo;
   117→    GLuint effect_texture;
   118→    bool textures_swapped;  // Which buffer is current result
   119→
   120→    // Transform stack (mat3 stored as 9 floats: row-major)
   121→    // Each mat3: [m00 m01 m02 m10 m11 m12 m20 m21 m22]
   122→    // Represents 2D affine transform (2x3 used, bottom row is 0,0,1)
   123→    float transform_stack[MAX_TRANSFORM_DEPTH * 9];
   124→    int transform_depth;
   125→
   126→    // Command queue (deferred rendering)
   127→    DrawCommand* commands;
   128→    int command_count;
   129→    int command_capacity;
   130→
   131→    // Current state
   132→    uint8_t current_blend;
   133→} Layer;
   134→
... [5 more lines]

520→static GLuint vbo = 0;
   521→
   522→// Layer registry
   523→#define MAX_LAYERS 16
   524→static Layer* layer_registry[MAX_LAYERS];
   525→static char* layer_names[MAX_LAYERS];
   526→static int layer_count = 0;
   527→
   528→// Screen blit resources
   529→static GLuint screen_shader = 0;
   530→static GLuint screen_vao = 0;
   531→static GLuint screen_vbo = 0;
   532→
   533→// Queue a shader application command (deferred - actual work done at frame end)
   534→static void layer_apply_shader(Layer* layer, GLuint shader) {
   535→    if (!shader) return;
   536→    if (layer->command_count >= MAX_COMMAND_CAPACITY) return;
   537→
   538→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   539→    memset(cmd, 0, sizeof(DrawCommand));

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   524→static Layer* layer_registry[MAX_LAYERS];
   525→static char* layer_names[MAX_LAYERS];
   526→static int layer_count = 0;
   527→
   528→// Screen blit resources
   529→static GLuint screen_shader = 0;
   530→static GLuint screen_vao = 0;
   531→static GLuint screen_vbo = 0;
   532→
   533→// Manual layer compositing queue
   534→typedef struct {
   535→    Layer* layer;
   536→    float x, y;  // Offset in game coordinates
   537→} LayerDrawCommand;
   538→
   539→#define MAX_LAYER_DRAWS 64
   540→static LayerDrawCommand layer_draw_queue[MAX_LAYER_DRAWS];
   541→static int layer_draw_count = 0;
   542→
   543→// Queue a layer to be drawn to screen at given offset
   544→static void layer_queue_draw(Layer* layer, float x, float y) {
   545→    if (layer_draw_count >= MAX_LAYER_DRAWS) return;
   546→    layer_draw_queue[layer_draw_count].layer = layer;
   547→    layer_draw_queue[layer_draw_count].x = x;
   548→    layer_draw_queue[layer_draw_count].y = y;
   549→    layer_draw_count++;
   550→}
   551→
   552→// Queue a shader application command (deferred - actual work done at frame end)
... [4 more lines]

1105:static int l_layer_apply_shader(lua_State* L) {
1106-    Layer* layer = (Layer*)lua_touserdata(L, 1);
1107-    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
1108-    layer_apply_shader(layer, shader);
1109-    return 0;
1110-}
1111-
1112-static int l_layer_get_texture(lua_State* L) {
1113-    Layer* layer = (Layer*)lua_touserdata(L, 1);

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1101→    return 0;
  1102→}
  1103→
  1104→// Layer effect Lua bindings
  1105→static int l_layer_apply_shader(lua_State* L) {
  1106→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1107→    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
  1108→    layer_apply_shader(layer, shader);
  1109→    return 0;
  1110→}
  1111→
  1112→static int l_layer_draw(lua_State* L) {
  1113→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1114→    float x = (lua_gettop(L) >= 2) ? (float)luaL_checknumber(L, 2) : 0.0f;
  1115→    float y = (lua_gettop(L) >= 3) ? (float)luaL_checknumber(L, 3) : 0.0f;
  1116→    layer_queue_draw(layer, x, y);
  1117→    return 0;
  1118→}
  1119→
  1120→static int l_layer_get_texture(lua_State* L) {
  1121→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1122→    GLuint tex = layer_get_texture(layer);
  1123→    lua_pushinteger(L, (lua_Integer)tex);
  1124→    return 1;
  1125→}

1155-    lua_register(L, "shader_set_texture", l_shader_set_texture);
1156-    // Layer effects
1157:    lua_register(L, "layer_apply_shader", l_layer_apply_shader);
1158-    lua_register(L, "layer_get_texture", l_layer_get_texture);
1159-    lua_register(L, "layer_reset_effects", l_layer_reset_effects);
1160-}

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1152→    lua_register(L, "shader_set_vec2", l_shader_set_vec2);
  1153→    lua_register(L, "shader_set_vec4", l_shader_set_vec4);
  1154→    lua_register(L, "shader_set_int", l_shader_set_int);
  1155→    lua_register(L, "shader_set_texture", l_shader_set_texture);
  1156→    // Layer effects
  1157→    lua_register(L, "layer_apply_shader", l_layer_apply_shader);
  1158→    lua_register(L, "layer_draw", l_layer_draw);
  1159→    lua_register(L, "layer_get_texture", l_layer_get_texture);
  1160→    lua_register(L, "layer_reset_effects", l_layer_reset_effects);
  1161→}
  1162→
  1163→// Main loop state (needed for emscripten)
  1164→static bool running = true;
  1165→static Uint64 perf_freq = 0;

1635:        // === PASS 2: Composite all layers to screen ===
1636-        glBindFramebuffer(GL_FRAMEBUFFER, 0);
1637-
1638-        // Get current window size
1639-        int window_w, window_h;
1640-        SDL_GetWindowSize(window, &window_w, &window_h);
1641-
1642-        // Calculate scale to fit window while maintaining aspect ratio
1643-        // Use integer scaling for pixel-perfect rendering
1644-        float scale_x = (float)window_w / GAME_WIDTH;
1645-        float scale_y = (float)window_h / GAME_HEIGHT;
1646-        float scale = (scale_x < scale_y) ? scale_x : scale_y;
1647-        int int_scale = (int)scale;
1648-        if (int_scale < 1) int_scale = 1;
1649-
1650-        // Calculate centered position with letterboxing
1651-        int scaled_w = GAME_WIDTH * int_scale;
1652-        int scaled_h = GAME_HEIGHT * int_scale;
1653-        int offset_x = (window_w - scaled_w) / 2;
1654-        int offset_y = (window_h - scaled_h) / 2;
1655-
1656-        // Clear screen to black (letterbox color)
1657-        glViewport(0, 0, window_w, window_h);
1658-        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
1659-        glClear(GL_COLOR_BUFFER_BIT);
1660-
1661-        // Set viewport for game area
1662-        glViewport(offset_x, offset_y, scaled_w, scaled_h);
1663-        glUseProgram(screen_shader);
1664-
... [21 more lines]

1309:static const char* screen_vertex_source =
1310-    "layout (location = 0) in vec2 aPos;\n"
1311-    "layout (location = 1) in vec2 aTexCoord;\n"
1312-    "out vec2 TexCoord;\n"
1313-    "void main() {\n"
1314-    "    gl_Position = vec4(aPos, 0.0, 1.0);\n"
1315-    "    TexCoord = aTexCoord;\n"
1316-    "}\n";
1317-
1318:static const char* screen_fragment_source =
1319-    "in vec2 TexCoord;\n"
1320-    "out vec4 FragColor;\n"
1321-    "uniform sampler2D screenTexture;\n"
1322-    "void main() {\n"
1323-    "    FragColor = texture(screenTexture, TexCoord);\n"
1324-    "}\n";
1325-
1326-// Compile a shader and return its ID (0 on failure)
1327-// Automatically prepends platform-specific header
1328-static GLuint compile_shader(GLenum type, const char* source) {
1329-    const char* header = (type == GL_VERTEX_SHADER) ? SHADER_HEADER_VERT : SHADER_HEADER_FRAG;
1330-
1331-    // Concatenate header + source
1332-    size_t header_len = strlen(header);
1333-    size_t source_len = strlen(source);
1334-    char* full_source = (char*)malloc(header_len + source_len + 1);
1335-    memcpy(full_source, header, header_len);
1336-    memcpy(full_source + header_len, source, source_len + 1);
1337-
1338-    GLuint shader = glCreateShader(type);
... [46 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1305→    "    }\n"
  1306→    "    FragColor = vec4(vColor.rgb + vAddColor, vColor.a * alpha);\n"
  1307→    "}\n";
  1308→
  1309→static const char* screen_vertex_source =
  1310→    "layout (location = 0) in vec2 aPos;\n"
  1311→    "layout (location = 1) in vec2 aTexCoord;\n"
  1312→    "uniform vec2 u_offset;\n"  // Offset in NDC (-1 to 1 range)
  1313→    "out vec2 TexCoord;\n"
  1314→    "void main() {\n"
  1315→    "    gl_Position = vec4(aPos + u_offset, 0.0, 1.0);\n"
  1316→    "    TexCoord = aTexCoord;\n"
  1317→    "}\n";
  1318→
  1319→static const char* screen_fragment_source =
  1320→    "in vec2 TexCoord;\n"
  1321→    "out vec4 FragColor;\n"

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1658→        glViewport(0, 0, window_w, window_h);
  1659→        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  1660→        glClear(GL_COLOR_BUFFER_BIT);
  1661→
  1662→        // Set viewport for game area
  1663→        glViewport(offset_x, offset_y, scaled_w, scaled_h);
  1664→        glUseProgram(screen_shader);
  1665→
  1666→        // Get offset uniform location
  1667→        GLint offset_loc = glGetUniformLocation(screen_shader, "u_offset");
  1668→
  1669→        if (layer_draw_count > 0) {
  1670→            // Manual compositing: use layer_draw queue
  1671→            for (int i = 0; i < layer_draw_count; i++) {
  1672→                LayerDrawCommand* cmd = &layer_draw_queue[i];
  1673→                Layer* layer = cmd->layer;
  1674→
  1675→                // Convert game coordinates to NDC offset
  1676→                // Game coords: (0,0) top-left, positive Y down
  1677→                // NDC: (-1,-1) bottom-left, positive Y up
  1678→                // Offset in NDC = (game_offset / game_size) * 2
  1679→                float ndc_x = (cmd->x / GAME_WIDTH) * 2.0f;
  1680→                float ndc_y = -(cmd->y / GAME_HEIGHT) * 2.0f;  // Flip Y
  1681→                glUniform2f(offset_loc, ndc_x, ndc_y);
  1682→
  1683→                glActiveTexture(GL_TEXTURE0);
  1684→                glBindTexture(GL_TEXTURE_2D, layer_get_texture(layer));
  1685→
  1686→                glBindVertexArray(screen_vao);
... [34 more lines]

anchor.c
src/anchor.c(890): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
gl.c
Generating Code...
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
Build successful: build/anchor.exe

150→    elseif emoji.y + half_h > screen_h then
   151→        emoji.y = screen_h - half_h
   152→        emoji.vy = -emoji.vy
   153→    end
   154→
   155→    -- === Draw to layers ===
   156→    -- Background layer: just the background color
   157→    layer_rectangle(bg_layer, 0, 0, screen_w, screen_h, bg_color)
   158→
   159→    -- Shadow layer: objects drawn at offset, then shadow shader applied
   160→    layer_push(shadow_layer, shadow_offset_x, shadow_offset_y, 0, 1, 1)
   161→        draw_objects(shadow_layer)
   162→    layer_pop(shadow_layer)
   163→
   164→    -- Outline layer: objects only (no background) so outline shader can detect edges
   165→    draw_objects(outline_layer)
   166→
   167→    -- Game layer: objects only (transparent, drawn on top)
   168→    draw_objects(game_layer)
   169→
   170→    -- === Apply shaders ===
   171→    layer_apply_shader(shadow_layer, shadow_shader)
   172→
   173→    shader_set_vec2(outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   174→    layer_apply_shader(outline_layer, outline_shader)
   175→
   176→    -- Rendering order: bg_layer -> shadow_layer -> outline_layer -> game_layer
   177→end
   178→

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   151→        emoji.y = screen_h - half_h
   152→        emoji.vy = -emoji.vy
   153→    end
   154→
   155→    -- === Draw to layers ===
   156→    -- Background layer: just the background color
   157→    layer_rectangle(bg_layer, 0, 0, screen_w, screen_h, bg_color)
   158→
   159→    -- Shadow layer: objects (no offset here - offset applied during compositing)
   160→    draw_objects(shadow_layer)
   161→
   162→    -- Outline layer: objects only (no background) so outline shader can detect edges
   163→    draw_objects(outline_layer)
   164→
   165→    -- Game layer: objects only (transparent, drawn on top)
   166→    draw_objects(game_layer)
   167→
   168→    -- === Apply shaders ===
   169→    layer_apply_shader(shadow_layer, shadow_shader)
   170→
   171→    shader_set_vec2(outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   172→    layer_apply_shader(outline_layer, outline_shader)
   173→
   174→    -- === Composite layers manually (with shadow offset) ===
   175→    layer_draw(bg_layer)
   176→    layer_draw(shadow_layer, shadow_offset_x, shadow_offset_y)
   177→    layer_draw(outline_layer)
   178→    layer_draw(game_layer)
   179→end
... [1 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    57→// Command queue capacity (fixed size, allocated once)
    58→// 16384 commands × ~64 bytes = ~1MB per layer
    59→#define MAX_COMMAND_CAPACITY 16384
    60→
    61→// Command types
    62→enum {
    63→    COMMAND_RECTANGLE = 0,
    64→    COMMAND_CIRCLE,
    65→    COMMAND_SPRITE,
    66→    COMMAND_APPLY_SHADER,       // Post-process layer through a shader
    67→    COMMAND_SET_UNIFORM_FLOAT,  // Set float uniform on shader
    68→    COMMAND_SET_UNIFORM_VEC2,   // Set vec2 uniform on shader
    69→    COMMAND_SET_UNIFORM_VEC4,   // Set vec4 uniform on shader
    70→    COMMAND_SET_UNIFORM_INT,    // Set int uniform on shader
    71→};
    72→
    73→// Blend modes
    74→enum {
    75→    BLEND_ALPHA = 0,

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    83→//   RECTANGLE: x,y is top-left corner, w,h extend right and down (matches SDL/LÖVE)
    84→//   CIRCLE: x,y is center, radius extends outward
    85→//   SPRITE: x,y is center (texture drawn centered at that point)
    86→typedef struct {
    87→    uint8_t type;           // COMMAND_RECTANGLE, COMMAND_CIRCLE, COMMAND_SPRITE, COMMAND_APPLY_SHADER, COMMAND_SET_UNIFORM_*
    88→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    89→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    90→
    91→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    88→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    89→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    90→
    91→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
    92→    uint32_t color;         // Packed RGBA for multiply/tint; For SET_UNIFORM_*: uniform location (4 bytes)
    93→
    94→    // Shape parameters (meaning depends on type)
    95→    // RECTANGLE: params[0]=x, [1]=y, [2]=w, [3]=h
    96→    // CIRCLE: params[0]=x, [1]=y, [2]=radius
    97→    // SPRITE: params[0]=x, [1]=y, [2]=w, [3]=h, [4]=ox, [5]=oy (+ texture_id)
    98→    // SET_UNIFORM_FLOAT: params[0]=value
    99→    // SET_UNIFORM_VEC2: params[0]=x, [1]=y
   100→    // SET_UNIFORM_VEC4: params[0]=x, [1]=y, [2]=z, [3]=w
   101→    // SET_UNIFORM_INT: params[0]=value (as float, cast to int)
   102→    float params[6];        // 24 bytes (reduced from 8 to fit 64-byte target)
   103→
   104→    GLuint texture_id;      // For SPRITE: texture handle; For APPLY_SHADER: shader handle (4 bytes)
   105→    uint32_t flash_color;   // Packed RGB for additive flash (uses only RGB, alpha ignored)

555→    layer_draw_queue[layer_draw_count].x = x;
   556→    layer_draw_queue[layer_draw_count].y = y;
   557→    layer_draw_count++;
   558→}
   559→
   560→// Queue a shader application command (deferred - actual work done at frame end)
   561→static void layer_apply_shader(Layer* layer, GLuint shader) {
   562→    if (!shader) return;
   563→    if (layer->command_count >= MAX_COMMAND_CAPACITY) return;
   564→
   565→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   566→    memset(cmd, 0, sizeof(DrawCommand));
   567→    cmd->type = COMMAND_APPLY_SHADER;
   568→    cmd->texture_id = shader;  // Reuse texture_id field for shader handle
   569→}
   570→
   571→// Execute shader application (ping-pong): read from current buffer, apply shader, write to alternate
   572→// Called during command processing when COMMAND_APPLY_SHADER is encountered
   573→static void execute_apply_shader(Layer* layer, GLuint shader) {
   574→    // Ensure effect buffer exists
   575→    layer_ensure_effect_buffer(layer);
   576→
   577→    // Determine source and destination based on current state
   578→    GLuint src_tex, dst_fbo;
   579→    if (layer->textures_swapped) {
   580→        src_tex = layer->effect_texture;
   581→        dst_fbo = layer->fbo;
   582→    } else {
   583→        src_tex = layer->color_texture;
   584→        dst_fbo = layer->effect_fbo;
... [20 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   556→    layer_draw_queue[layer_draw_count].y = y;
   557→    layer_draw_count++;
   558→}
   559→
   560→// Queue a shader application command (deferred - actual work done at frame end)
   561→static void layer_apply_shader(Layer* layer, GLuint shader) {
   562→    if (!shader) return;
   563→    if (layer->command_count >= MAX_COMMAND_CAPACITY) return;
   564→
   565→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   566→    memset(cmd, 0, sizeof(DrawCommand));
   567→    cmd->type = COMMAND_APPLY_SHADER;
   568→    cmd->texture_id = shader;  // Reuse texture_id field for shader handle
   569→}
   570→
   571→// Queue uniform setting commands (deferred - applied when processing commands)
   572→static void layer_shader_set_float(Layer* layer, GLuint shader, const char* name, float value) {
   573→    if (!shader || layer->command_count >= MAX_COMMAND_CAPACITY) return;
   574→
   575→    GLint loc = glGetUniformLocation(shader, name);
   576→    if (loc == -1) return;  // Uniform not found
   577→
   578→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   579→    memset(cmd, 0, sizeof(DrawCommand));
   580→    cmd->type = COMMAND_SET_UNIFORM_FLOAT;
   581→    cmd->texture_id = shader;
   582→    cmd->color = (uint32_t)loc;  // Store uniform location
   583→    cmd->params[0] = value;
   584→}
... [52 more lines]

840→                       addR, addG, addB);
   841→}
   842→
   843→// Apply GL blend state based on blend mode
   844→static void apply_blend_mode(uint8_t mode) {
   845→    switch (mode) {
   846→        case BLEND_ALPHA:
   847→            // Standard alpha blending: result = src * src.a + dst * (1 - src.a)
   848→            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   849→            break;
   850→        case BLEND_ADDITIVE:
   851→            // Additive blending: result = src * src.a + dst (good for glows, particles)
   852→            glBlendFunc(GL_SRC_ALPHA, GL_ONE);
   853→            break;
   854→    }
   855→}
   856→
   857→// Render all commands on a layer
   858→// Note: Caller must have set up projection matrix and bound initial FBO before calling
   859→static void layer_render(Layer* layer) {
   860→    batch_vertex_count = 0;
   861→    current_batch_texture = 0;
   862→    uint8_t current_blend = BLEND_ALPHA;  // Start with default
   863→    apply_blend_mode(current_blend);
   864→
   865→    for (int i = 0; i < layer->command_count; i++) {
   866→        const DrawCommand* cmd = &layer->commands[i];
   867→
   868→        // Handle shader application command
   869→        if (cmd->type == COMMAND_APPLY_SHADER) {
... [50 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   864→
   865→    for (int i = 0; i < layer->command_count; i++) {
   866→        const DrawCommand* cmd = &layer->commands[i];
   867→
   868→        // Handle uniform setting commands
   869→        if (cmd->type == COMMAND_SET_UNIFORM_FLOAT) {
   870→            glUseProgram(cmd->texture_id);
   871→            glUniform1f((GLint)cmd->color, cmd->params[0]);
   872→            continue;
   873→        }
   874→        if (cmd->type == COMMAND_SET_UNIFORM_VEC2) {
   875→            glUseProgram(cmd->texture_id);
   876→            glUniform2f((GLint)cmd->color, cmd->params[0], cmd->params[1]);
   877→            continue;
   878→        }
   879→        if (cmd->type == COMMAND_SET_UNIFORM_VEC4) {
   880→            glUseProgram(cmd->texture_id);
   881→            glUniform4f((GLint)cmd->color, cmd->params[0], cmd->params[1], cmd->params[2], cmd->params[3]);
   882→            continue;
   883→        }
   884→        if (cmd->type == COMMAND_SET_UNIFORM_INT) {
   885→            glUseProgram(cmd->texture_id);
   886→            glUniform1i((GLint)cmd->color, (int)cmd->params[0]);
   887→            continue;
   888→        }
   889→
   890→        // Handle shader application command
   891→        if (cmd->type == COMMAND_APPLY_SHADER) {
   892→            // Flush pending draw commands before shader application
... [23 more lines]

1150:static int l_shader_set_float(lua_State* L) {
1158:static int l_shader_set_vec2(lua_State* L) {
1167:static int l_shader_set_vec4(lua_State* L) {
1178:static int l_shader_set_int(lua_State* L) {
1186:static int l_shader_set_texture(lua_State* L) {

1145→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1146→    effect_shader_destroy(shader);
  1147→    return 0;
  1148→}
  1149→
  1150→static int l_shader_set_float(lua_State* L) {
  1151→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1152→    const char* name = luaL_checkstring(L, 2);
  1153→    float value = (float)luaL_checknumber(L, 3);
  1154→    shader_set_float(shader, name, value);
  1155→    return 0;
  1156→}
  1157→
  1158→static int l_shader_set_vec2(lua_State* L) {
  1159→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1160→    const char* name = luaL_checkstring(L, 2);
  1161→    float x = (float)luaL_checknumber(L, 3);
  1162→    float y = (float)luaL_checknumber(L, 4);
  1163→    shader_set_vec2(shader, name, x, y);
  1164→    return 0;
  1165→}
  1166→
  1167→static int l_shader_set_vec4(lua_State* L) {
  1168→    GLuint shader = (GLuint)luaL_checkinteger(L, 1);
  1169→    const char* name = luaL_checkstring(L, 2);
  1170→    float x = (float)luaL_checknumber(L, 3);
  1171→    float y = (float)luaL_checknumber(L, 4);
  1172→    float z = (float)luaL_checknumber(L, 5);
  1173→    float w = (float)luaL_checknumber(L, 6);
  1174→    shader_set_vec4(shader, name, x, y, z, w);
... [40 more lines]

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1146→    effect_shader_destroy(shader);
  1147→    return 0;
  1148→}
  1149→
  1150→// Deferred uniform setting Lua bindings (queued to layer's command list)
  1151→static int l_layer_shader_set_float(lua_State* L) {
  1152→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1153→    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
  1154→    const char* name = luaL_checkstring(L, 3);
  1155→    float value = (float)luaL_checknumber(L, 4);
  1156→    layer_shader_set_float(layer, shader, name, value);
  1157→    return 0;
  1158→}
  1159→
  1160→static int l_layer_shader_set_vec2(lua_State* L) {
  1161→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1162→    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
  1163→    const char* name = luaL_checkstring(L, 3);
  1164→    float x = (float)luaL_checknumber(L, 4);
  1165→    float y = (float)luaL_checknumber(L, 5);
  1166→    layer_shader_set_vec2(layer, shader, name, x, y);
  1167→    return 0;
  1168→}
  1169→
  1170→static int l_layer_shader_set_vec4(lua_State* L) {
  1171→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  1172→    GLuint shader = (GLuint)luaL_checkinteger(L, 2);
  1173→    const char* name = luaL_checkstring(L, 3);
  1174→    float x = (float)luaL_checknumber(L, 4);
... [19 more lines]

1235-    lua_register(L, "shader_load_file", l_shader_load_file);
1236-    lua_register(L, "shader_load_string", l_shader_load_string);
1237-    lua_register(L, "shader_destroy", l_shader_destroy);
1238:    lua_register(L, "shader_set_float", l_shader_set_float);
1239:    lua_register(L, "shader_set_vec2", l_shader_set_vec2);
1240:    lua_register(L, "shader_set_vec4", l_shader_set_vec4);
1241:    lua_register(L, "shader_set_int", l_shader_set_int);
1242:    lua_register(L, "shader_set_texture", l_shader_set_texture);
1243-    // Layer effects
1244-    lua_register(L, "layer_apply_shader", l_layer_apply_shader);
1245-    lua_register(L, "layer_draw", l_layer_draw);
1246-    lua_register(L, "layer_get_texture", l_layer_get_texture);
1247-    lua_register(L, "layer_reset_effects", l_layer_reset_effects);

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1231→    lua_register(L, "rgba", l_rgba);
  1232→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  1233→    lua_register(L, "timing_resync", l_timing_resync);
  1234→    // Effect shaders
  1235→    lua_register(L, "shader_load_file", l_shader_load_file);
  1236→    lua_register(L, "shader_load_string", l_shader_load_string);
  1237→    lua_register(L, "shader_destroy", l_shader_destroy);
  1238→    // Layer shader uniforms (deferred)
  1239→    lua_register(L, "layer_shader_set_float", l_layer_shader_set_float);
  1240→    lua_register(L, "layer_shader_set_vec2", l_layer_shader_set_vec2);
  1241→    lua_register(L, "layer_shader_set_vec4", l_layer_shader_set_vec4);
  1242→    lua_register(L, "layer_shader_set_int", l_layer_shader_set_int);
  1243→    // Layer effects
  1244→    lua_register(L, "layer_apply_shader", l_layer_apply_shader);
  1245→    lua_register(L, "layer_draw", l_layer_draw);
  1246→    lua_register(L, "layer_get_texture", l_layer_get_texture);
  1247→    lua_register(L, "layer_reset_effects", l_layer_reset_effects);
  1248→}
  1249→
  1250→// Main loop state (needed for emscripten)
  1251→static bool running = true;

anchor.c
src/anchor.c(981): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
gl.c
Generating Code...
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
Build successful: build/anchor.exe

The file E:\a327ex\Anchor\test\main.lua has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   160→
   161→    -- Game layer: objects only (transparent, drawn on top)
   162→    draw_objects(game_layer)
   163→
   164→    -- === Apply shaders ===
   165→    layer_apply_shader(shadow_layer, shadow_shader)
   166→
   167→    layer_shader_set_vec2(outline_layer, outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
   168→    layer_apply_shader(outline_layer, outline_shader)
   169→
   170→    -- === Composite layers manually (with shadow offset) ===
   171→    layer_draw(bg_layer)
   172→    layer_draw(shadow_layer, 4, 4)

Building with game folder: ../test
Build successful: build-web/anchor.html
To test: cd build-web && python -m http.server 8000
Then open: http://localhost:8000/anchor.html

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   864→
   865→    for (int i = 0; i < layer->command_count; i++) {
   866→        const DrawCommand* cmd = &layer->commands[i];
   867→
   868→        // Handle uniform setting commands
   869→        // These need to temporarily switch programs, so flush batch first and restore after
   870→        if (cmd->type == COMMAND_SET_UNIFORM_FLOAT ||
   871→            cmd->type == COMMAND_SET_UNIFORM_VEC2 ||
   872→            cmd->type == COMMAND_SET_UNIFORM_VEC4 ||
   873→            cmd->type == COMMAND_SET_UNIFORM_INT) {
   874→            // Flush any pending draws before switching programs
   875→            batch_flush();
   876→            current_batch_texture = 0;
   877→
   878→            glUseProgram(cmd->texture_id);
   879→            switch (cmd->type) {
   880→                case COMMAND_SET_UNIFORM_FLOAT:
   881→                    glUniform1f((GLint)cmd->color, cmd->params[0]);
   882→                    break;
   883→                case COMMAND_SET_UNIFORM_VEC2:
   884→                    glUniform2f((GLint)cmd->color, cmd->params[0], cmd->params[1]);
   885→                    break;
   886→                case COMMAND_SET_UNIFORM_VEC4:
   887→                    glUniform4f((GLint)cmd->color, cmd->params[0], cmd->params[1], cmd->params[2], cmd->params[3]);
   888→                    break;
   889→                case COMMAND_SET_UNIFORM_INT:
   890→                    glUniform1i((GLint)cmd->color, (int)cmd->params[0]);
   891→                    break;
   892→            }
... [9 more lines]

anchor.c
src/anchor.c(990): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
gl.c
Generating Code...
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
Build successful: build/anchor.exe

Building with game folder: ../test
Build successful: build-web/anchor.html
To test: cd build-web && python -m http.server 8000
Then open: http://localhost:8000/anchor.html

/c/Users/adn/.claude/projects/E--a327ex-Anchor/7483d373-57c5-4835-bd20-02edf893d056.jsonl

Written to C:/Users/adn/AppData/Local/Temp/session-review.md

<tool_use_error>File content (340.2KB) exceeds maximum allowed size (256KB). Please use offset and limit parameters to read specific portions of the file, or use the GrepTool to search for specific content.</tool_use_error>

File content (32534 tokens) exceeds maximum allowed tokens (25000). Please use offset and limit parameters to read specific portions of the file, or use the GrepTool to search for specific content.

1→# Session 2026-01-08 10:18
     2→
     3→---
     4→
     5→> Hi, Claude. Let's get started on Anchor's phase 4. Tell me how you'll approach it after reading all files in docs/*
     6→
     7→<details>
     8→<summary><code>Glob (docs/*)</code></summary>
     9→
    10→<pre><code>E:\a327ex\Anchor\docs\SHAPES_PLAN.md
    11→E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md
    12→E:\a327ex\Anchor\docs\ANCHOR.md</code></pre>
    13→
    14→</details>
    15→
    16→<details>
    17→<summary><code>Read (E:\a327ex\Anchor\docs\SHAPES_PLAN.md)</code></summary>
    18→
    19→<pre><code>1→# Shapes Rendering System — Implementation Plan
    20→     2→
    21→     3→A comprehensive 2D vector graphics system for Anchor, inspired by Freya Holmér's Shapes plugin for Unity. SDF-based rendering for clean edges at any scale, with full support for gradients, dashes, outlines, and texture fills.
    22→     4→
    23→     5→---
    24→     6→
    25→     7→## Goals
    26→     8→
    27→     9→- **High-quality rendering**: Local anti-aliasing built into all shapes, smooth edges without relying on MSAA
    28→    10→- **Arbitrary thickness**: Lines and outlines at any pixel width, with proper thinness fading for sub-pixel sizes
    29→    11→- **Rich styling**: Gradients (linear, radial, angular, bilinear), dashes, outlines, texture fills
    30→    12→- **Efficient batching**: Minimize draw calls via uber-shader approach
... [970 more lines]

1000→    23→
  1001→    24→## Build Strategy
  1002→    25→
  1003→    26→### YueScript Compilation
  1004→    27→
  1005→    28→**Build-time compilation** — compile `.yue` → `.lua` during build, not at runtime.
  1006→    29→
  1007→    30→```
  1008→... [775 more lines]</code></pre>
  1009→
  1010→</details>
  1011→
  1012→<details>
  1013→<summary><code>Write (E:\a327ex\Anchor\reference\phase-4-effects-analysis.md)</code></summary>
  1014→
  1015→<pre><code>The file E:\a327ex\Anchor\reference\phase-4-effects-analysis.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1016→     1→# Phase 4: Effects System Analysis
  1017→     2→
  1018→     3→A comprehensive analysis of shader/effect requirements for Anchor, based on examination of Super Emoji Box, BYTEPATH, and general 2D game effect patterns.
  1019→     4→
  1020→     5→---
  1021→     6→
  1022→     7→## Table of Contents
  1023→     8→
  1024→     9→1. [Usage Analysis: Super Emoji Box](#usage-analysis-super-emoji-box)
  1025→    10→2. [Usage Analysis: BYTEPATH](#usage-analysis-bytepath)
  1026→    11→3. [Effect Categories](#effect-categories)
  1027→    12→4. [Per-Layer vs Per-Object Effects](#per-layer-vs-per-object-effects)
  1028→    13→5. [Recommended Architecture](#recommended-architecture)
  1029→    14→6. [Ping-Pong Buffer System](#ping-pong-buffer-system)
... [970 more lines]

2000→   252→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  2001→   253→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  2002→   254→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  2003→   255→    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  2004→   256→
  2005→   257→    // Create effect FBO
  2006→... [28 more lines]</code></pre>
  2007→
  2008→</details>
  2009→
  2010→Now I need to add `layer_apply_shader`. Let me first check how the screen blit works to understand the fullscreen quad pattern.
  2011→
  2012→<details>
  2013→<summary><code>Grep (screen_vao|screen_vbo)</code></summary>
  2014→
  2015→<pre><code>521:static GLuint screen_vao = 0;
  2016→522:static GLuint screen_vbo = 0;
  2017→1314:    if (screen_vbo) { glDeleteBuffers(1, &amp;screen_vbo); screen_vbo = 0; }
  2018→1315:    if (screen_vao) { glDeleteVertexArrays(1, &amp;screen_vao); screen_vao = 0; }
  2019→1497:            glBindVertexArray(screen_vao);
  2020→1653:    glGenVertexArrays(1, &amp;screen_vao);
  2021→1654:    glGenBuffers(1, &amp;screen_vbo);
  2022→1656:    glBindVertexArray(screen_vao);
  2023→1657:    glBindBuffer(GL_ARRAY_BUFFER, screen_vbo);
  2024→
  2025→[Showing results with pagination = limit: 20, offset: 0]</code></pre>
  2026→
  2027→</details>
  2028→
  2029→<details>
... [970 more lines]

1→# Anchor Implementation Plan
     2→
     3→C engine with YueScript scripting, OpenGL rendering, targeting Windows and Web.
     4→
     5→---
     6→
     7→## Summary of Key Decisions
     8→
     9→| Area | Decision | Rationale |
    10→|------|----------|-----------|
    11→| Renderer | OpenGL | Smooth rotation, additive blending, performance headroom, console-portable |
    12→| Audio | TBD (miniaudio or SoLoud) | Need pitch shifting; SDL_mixer insufficient |
    13→| Physics | Box2D 3.1 | Already used, true ball-to-ball collisions needed |
    14→| Scripting | Lua 5.4 + YueScript | Build-time compilation with `-r` flag for line numbers |
    15→| Timestep | Fixed 120Hz physics, 60Hz render | Decoupled for pixel-perfect visuals with responsive input |
    16→| Resolution | Per-game configurable | 480×270, 640×360, or custom; aspect-ratio scaling with letterboxing |
    17→| C Structure | Single anchor.c | Monolithic file, easier navigation |
    18→| Resources | Live forever | Games are small enough; no unloading needed |
    19→| Linking | Static | No DLLs; SDL2, Lua, audio all compiled in |
    20→| Distribution | Single executable | Zip-append for game content, extractable by modders |
    21→
    22→---
    23→
    24→## Build Strategy
    25→
    26→### YueScript Compilation
    27→
    28→**Build-time compilation** — compile `.yue` → `.lua` during build, not at runtime.
    29→
    30→```
... [838 more lines]

The file E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   360→---
   361→
   362→### Implementation Steps
   363→
   364→**Step 1: Shader loading infrastructure** ✓
   365→- [x] `shader_load_file(path)` — load fragment shader from file, pair with screen vertex shader
   366→- [x] `shader_load_string(source)` — load fragment shader from string
   367→- [x] `shader_destroy(shader)` — cleanup
   368→- [x] Auto-prepend platform headers (`#version 330 core` / `#version 300 es`)
   369→- [x] Lua bindings for above
   370→
   371→**Step 2: Uniform setting (deferred)** ✓
   372→- [x] `layer_shader_set_float(layer, shader, name, value)` — queues command
   373→- [x] `layer_shader_set_vec2(layer, shader, name, x, y)` — queues command
   374→- [x] `layer_shader_set_vec4(layer, shader, name, x, y, z, w)` — queues command
   375→- [x] `layer_shader_set_int(layer, shader, name, value)` — queues command
   376→- [x] Uniforms processed at frame end (deferred, not immediate)
   377→- [x] Lua bindings for above
   378→
   379→**Step 3: Layer ping-pong buffers** ✓
   380→- [x] Add to Layer struct: `effect_fbo`, `effect_texture`, `textures_swapped`
   381→- [x] Create effect FBO on first use (lazy initialization)
   382→- [x] `layer_apply_shader(layer, shader)` — queues command (deferred)
   383→- [x] Ping-pong rendering: color_texture ↔ effect_texture
   384→- [x] `layer_get_texture(layer)` — return whichever texture is current
   385→- [x] Reset `textures_swapped` at start of each frame
   386→- [x] Lua bindings for above
   387→
   388→**Step 4: Per-object flash (vertex attribute)** ✓
... [26 more lines]

The file E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   410→- [x] Verify all effects work on Windows and Web
   411→
   412→---
   413→
   414→### Lua API
   415→
   416→```lua
   417→-- Shader loading
   418→local outline_shader = shader_load_file('shaders/outline.frag')
   419→local shadow_shader = shader_load_file('shaders/shadow.frag')
   420→
   421→-- Deferred uniform setting (queues command, processed at frame end)
   422→layer_shader_set_vec2(outline_layer, outline_shader, 'u_pixel_size', 1/480, 1/270)
   423→
   424→-- Layer post-processing (deferred, ping-pong)
   425→layer_apply_shader(shadow_layer, shadow_shader)
   426→layer_apply_shader(outline_layer, outline_shader)
   427→
   428→-- Manual layer compositing with offset (for shadow positioning)
   429→layer_draw(bg_layer)
   430→layer_draw(shadow_layer, 4, 4)  -- offset shadow by 4 pixels
   431→layer_draw(outline_layer)
   432→layer_draw(game_layer)
   433→
   434→-- Get layer texture (for use as input to another shader)
   435→local tex = layer_get_texture(game)
   436→```
   437→
   438→**Key architecture decisions:**
... [23 more lines]

1336:### Effects
1337-
1338-Effects are fragment shaders applied to layer framebuffers. Shaders are loaded from files and controlled from Lua — there are no built-in effects in C.
1339-
1340-**Layer effects (post-processing):**
1341-
1342-Each layer has a ping-pong buffer system. When `layer_apply_shader()` is called, it renders the layer's current texture to a second buffer using the shader, then swaps which buffer is "current". This allows effect chaining.
1343-
1344-```lua
1345--- Load shaders from files
1346-local outline_shader = shader_load_file('shaders/outline.frag')
1347-local shadow_shader = shader_load_file('shaders/shadow.frag')
1348-
1349--- Set uniforms before applying
1350-shader_set_vec2(outline_shader, 'pixel_size', 1/480, 1/270)
1351-
1352--- Apply to layer (ping-pong)
1353-layer_apply_shader(game, outline_shader)
1354-
1355--- Chain multiple effects
1356-layer_apply_shader(game, effect1)
1357-layer_apply_shader(game, effect2)
1358-
1359--- Get layer texture (for use as input to another shader)
1360-local tex = layer_get_texture(shockwave)
1361-shader_set_texture(displacement_shader, 'displacement_map', tex)
1362-layer_apply_shader(game, displacement_shader)
1363-```
1364-
1365-**Per-object flash (vertex attribute):**
... [21 more lines]

<tool_use_error>File has not been read yet. Read it first before writing to it.</tool_use_error>

1330→
  1331→```lua
  1332→layer:set_blend_mode('alpha')     -- default (standard transparency)
  1333→layer:set_blend_mode('additive')  -- for glows, explosions, energy effects
  1334→```
  1335→
  1336→### Effects
  1337→
  1338→Effects are fragment shaders applied to layer framebuffers. Shaders are loaded from files and controlled from Lua — there are no built-in effects in C.
  1339→
  1340→**Layer effects (post-processing):**
  1341→
  1342→Each layer has a ping-pong buffer system. When `layer_apply_shader()` is called, it renders the layer's current texture to a second buffer using the shader, then swaps which buffer is "current". This allows effect chaining.
  1343→
  1344→```lua
  1345→-- Load shaders from files
  1346→local outline_shader = shader_load_file('shaders/outline.frag')
  1347→local shadow_shader = shader_load_file('shaders/shadow.frag')
  1348→
  1349→-- Set uniforms before applying
  1350→shader_set_vec2(outline_shader, 'pixel_size', 1/480, 1/270)
  1351→
  1352→-- Apply to layer (ping-pong)
  1353→layer_apply_shader(game, outline_shader)
  1354→
  1355→-- Chain multiple effects
  1356→layer_apply_shader(game, effect1)
  1357→layer_apply_shader(game, effect2)
  1358→
  1359→-- Get layer texture (for use as input to another shader)
... [30 more lines]

The file E:\a327ex\Anchor\docs\ANCHOR.md has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
  1332→layer:set_blend_mode('alpha')     -- default (standard transparency)
  1333→layer:set_blend_mode('additive')  -- for glows, explosions, energy effects
  1334→```
  1335→
  1336→### Effects
  1337→
  1338→Effects are fragment shaders applied to layer framebuffers. Shaders are loaded from files and controlled from Lua — there are no built-in effects in C.
  1339→
  1340→**Fully deferred pipeline:** All shader operations (uniform setting, shader application) are queued during update and processed at frame end. This ensures all draw commands are complete before effects are applied.
  1341→
  1342→**Layer effects (post-processing):**
  1343→
  1344→Each layer has a ping-pong buffer system (`color_texture` ↔ `effect_texture`). When `layer_apply_shader()` is called, it queues a command that renders the current texture to the other buffer using the shader, then swaps. This allows effect chaining.
  1345→
  1346→```lua
  1347→-- Load shaders from files
  1348→local outline_shader = shader_load_file('shaders/outline.frag')
  1349→local shadow_shader = shader_load_file('shaders/shadow.frag')
  1350→
  1351→-- Deferred uniform setting (queues command, processed at frame end)
  1352→layer_shader_set_vec2(outline_layer, outline_shader, 'u_pixel_size', 1/480, 1/270)
  1353→
  1354→-- Apply shader to layer (deferred, ping-pong)
  1355→layer_apply_shader(outline_layer, outline_shader)
  1356→layer_apply_shader(shadow_layer, shadow_shader)
  1357→
  1358→-- Manual layer compositing with offset (for shadow positioning)
  1359→layer_draw(bg_layer)
  1360→layer_draw(shadow_layer, 4, 4)  -- offset shadow by 4 pixels
... [16 more lines]

Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable

1→# Phase 4: Effects System Analysis
     2→
     3→A comprehensive analysis of shader/effect requirements for Anchor, based on examination of Super Emoji Box, BYTEPATH, and general 2D game effect patterns.
     4→
     5→---
     6→
     7→## Table of Contents
     8→
     9→1. [Usage Analysis: Super Emoji Box](#usage-analysis-super-emoji-box)
    10→2. [Usage Analysis: BYTEPATH](#usage-analysis-bytepath)
    11→3. [Effect Categories](#effect-categories)
    12→4. [Per-Layer vs Per-Object Effects](#per-layer-vs-per-object-effects)
    13→5. [Recommended Architecture](#recommended-architecture)
    14→6. [Ping-Pong Buffer System](#ping-pong-buffer-system)
    15→7. [Per-Object Flash via Vertex Attributes](#per-object-flash-via-vertex-attributes)
    16→8. [Lua API](#lua-api)
    17→9. [C-Side Requirements](#c-side-requirements)
    18→10. [Phase 4 Scope](#phase-4-scope)
    19→
    20→---
    21→
    22→## Usage Analysis: Super Emoji Box
    23→
    24→Super Emoji Box uses a **simple, layer-based effect system** with three shaders:
    25→
    26→### Shaders Used
    27→
    28→| Shader | Purpose | Application |
    29→|--------|---------|-------------|
    30→| `outline.frag` | Black silhouette behind objects | Per-layer post-process |
... [70 more lines]

450:## Phase 4 Scope
451-
452-For emoji-style games, we need:
453-
454-### Must Have
455-1. **Outline shader** — layer-level, samples neighbors for edge detection
456-2. **Shadow shader** — layer-level, darkens and reduces alpha
457-3. **Flash** — per-object via vertex attribute (additive color)
458-
459-### Infrastructure Required
460-- Shader loading from file
461-- Uniform setting (float, vec2, vec4, texture)
462-- `layer_apply_shader()` with ping-pong buffers
463-- `layer_get_texture()` for accessing layer as texture input
464-- Extended vertex format with additive color
465-
466-### Deferred
467-- Per-object outline (different from layer outline)
468-- Grayscale/silhouette effects
469-- Complex effect chaining (BYTEPATH-style)
470-- CRT/distortion effects
471-
472-These can be added later using the same infrastructure.

E:\a327ex\Anchor\test\shaders\outline.frag
E:\a327ex\Anchor\test\shaders\shadow.frag

87:        layer_draw_texture(layer, smile_tex, 0, 0)
98:                layer_draw_texture(layer, star_tex, 0, 0)
165:    layer_apply_shader(shadow_layer, shadow_shader)
167:    layer_shader_set_vec2(outline_layer, outline_shader, 'u_pixel_size', 1/screen_w, 1/screen_h)
168:    layer_apply_shader(outline_layer, outline_shader)
171:    layer_draw(bg_layer)
172:    layer_draw(shadow_layer, 4, 4)
173:    layer_draw(outline_layer)
174:    layer_draw(game_layer)

1066 /c/Users/adn/.claude/projects/E--a327ex-Anchor/7483d373-57c5-4835-bd20-02edf893d056.jsonl