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
... [1435 more lines]

E:\a327ex\Anchor\test\assets\slight_smile.png
E:\a327ex\Anchor\test\assets\star.png
E:\a327ex\Anchor\test\main.lua

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>
... [1457 more lines]

1→# Pixel-Perfect Rendering with Smooth Movement Research
     2→
     3→## The Problem
     4→
     5→When rendering pixel art at a fixed low resolution (e.g., 480x270) and upscaling to display (e.g., 1440x810 at 3x), there's a fundamental tradeoff:
     6→
     7→1. **Pixel-perfect appearance** requires snapping object positions to integers
     8→2. **Smooth movement** requires fractional positions
     9→
    10→Snapping positions causes jagged/jittery movement because objects "jump" between pixel positions rather than moving smoothly.
    11→
    12→## The Sub-Pixel Offset Technique (Common Solution)
    13→
    14→This technique is used by Unity's 2D Pixel Perfect package, Godot's smooth pixel camera implementations, and others.
    15→
    16→### How It Works
    17→
    18→1. **Render the game** at the pixel-perfect resolution with objects snapped to integer positions
    19→2. **Track the fractional position** of the camera (or focal point)
    20→3. **Offset the final screen blit** by the fractional amount multiplied by the scale factor
    21→
    22→### Example
    23→
    24→- Game resolution: 480x270
    25→- Screen resolution: 1440x810 (3x scale)
    26→- Camera position: 100.7
    27→- Fractional part: 0.7
    28→- Screen offset: 0.7 × 3 = 2.1 screen pixels
    29→
    30→The entire rendered image shifts by 2.1 pixels on screen, creating smooth perceived motion while the internal game stays pixel-snapped.
... [166 more lines]

E:\a327ex\Anchor\reference\snkrx.yue
E:\a327ex\Anchor\reference\swarm_survival.yue
E:\a327ex\Anchor\reference\examples.yue
E:\a327ex\Anchor\reference\dungeon.yue
E:\a327ex\Anchor\website\context\dungeon.yue
E:\a327ex\Anchor\website\context\snkrx.yue
E:\a327ex\Anchor\website\context\swarm_survival.yue
E:\a327ex\Anchor\website\files\Opus 4.5\snkrx.yue
E:\a327ex\Anchor\website\files\Opus 4.5\dungeon.yue
E:\a327ex\Anchor\website\files\Opus 4.5\swarm_survival.yue

1→@echo off
     2→setlocal
     3→
     4→cd /d "%~dp0"
     5→
     6→:: Find and run vcvarsall.bat for Visual Studio
     7→if exist "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" (
     8→    call "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
     9→) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" (
    10→    call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
    11→) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" (
    12→    call "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
    13→) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" (
    14→    call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
    15→) else (
    16→    echo ERROR: Could not find Visual Studio
    17→    exit /b 1
    18→)
    19→
    20→if not exist build mkdir build
    21→
    22→:: Build Lua library if it doesn't exist
    23→if not exist lib\lua.lib (
    24→    echo Building Lua library...
    25→    if not exist build\lua_obj mkdir build\lua_obj
    26→    cl.exe /nologo /O2 /W3 /c /I"include/lua" ^
    27→        include/lua/lapi.c include/lua/lauxlib.c include/lua/lbaselib.c ^
    28→        include/lua/lcode.c include/lua/lcorolib.c include/lua/lctype.c ^
    29→        include/lua/ldblib.c include/lua/ldebug.c include/lua/ldo.c ^
    30→        include/lua/ldump.c include/lua/lfunc.c include/lua/lgc.c ^
... [39 more lines]

File created successfully at: E:\a327ex\Anchor\reference\anchor-project-review.md

Exit code 137
[Request interrupted by user for tool use]

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→/*
     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>
... [70 more lines]

100→
   101→    // Command queue (deferred rendering)
   102→    DrawCommand* commands;
   103→    int command_count;
   104→    int command_capacity;
   105→
   106→    // Current state
   107→    uint8_t current_blend;
   108→} Layer;
   109→
   110→// Texture
   111→typedef struct {
   112→    GLuint id;
   113→    int width;
   114→    int height;
   115→} Texture;
   116→
   117→// Load a texture from file using stb_image
   118→static Texture* texture_load(const char* path) {
   119→    int width, height, channels;
   120→    stbi_set_flip_vertically_on_load(0);  // Don't flip - we handle Y in our coordinate system
   121→    unsigned char* data = stbi_load(path, &width, &height, &channels, 4);  // Force RGBA
   122→    if (!data) {
   123→        fprintf(stderr, "Failed to load texture: %s\n", path);
   124→        return NULL;
   125→    }
   126→
   127→    Texture* tex = (Texture*)malloc(sizeof(Texture));
   128→    if (!tex) {
   129→        stbi_image_free(data);
... [120 more lines]

340→// Push a transform onto the layer's stack
   341→// Builds TRS matrix (Translate * Rotate * Scale) and multiplies with current
   342→static void layer_push(Layer* layer, float x, float y, float r, float sx, float sy) {
   343→    if (layer->transform_depth >= MAX_TRANSFORM_DEPTH - 1) {
   344→        fprintf(stderr, "Warning: transform stack overflow\n");
   345→        return;
   346→    }
   347→
   348→    // Build TRS matrix: result of Translate(x,y) * Rotate(r) * Scale(sx,sy)
   349→    // [sx*cos  -sy*sin  x]
   350→    // [sx*sin   sy*cos  y]
   351→    // [   0        0    1]
   352→    float c = cosf(r);
   353→    float s = sinf(r);
   354→    float m[9] = {
   355→        sx * c, -sy * s, x,
   356→        sx * s,  sy * c, y,
   357→        0.0f,    0.0f,   1.0f
   358→    };
   359→
   360→    // Get parent transform
   361→    float* parent = layer_get_transform(layer);
   362→
   363→    // Increment depth
   364→    layer->transform_depth++;
   365→
   366→    // Get new current transform slot
   367→    float* current = layer_get_transform(layer);
   368→
   369→    // Multiply: current = parent * m
... [20 more lines]

700→    layer_count++;
   701→
   702→    printf("Created layer: %s\n", name);
   703→    return layer;
   704→}
   705→
   706→// Lua bindings
   707→static int l_layer_create(lua_State* L) {
   708→    const char* name = luaL_checkstring(L, 1);
   709→    Layer* layer = layer_get_or_create(name);
   710→    if (!layer) {
   711→        return luaL_error(L, "Failed to create layer: %s", name);
   712→    }
   713→    lua_pushlightuserdata(L, layer);
   714→    return 1;
   715→}
   716→
   717→static int l_layer_rectangle(lua_State* L) {
   718→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   719→    float x = (float)luaL_checknumber(L, 2);
   720→    float y = (float)luaL_checknumber(L, 3);
   721→    float w = (float)luaL_checknumber(L, 4);
   722→    float h = (float)luaL_checknumber(L, 5);
   723→    uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
   724→    layer_add_rectangle(layer, x, y, w, h, color);
   725→    return 0;
   726→}
   727→
   728→static int l_layer_circle(lua_State* L) {
   729→    Layer* layer = (Layer*)lua_touserdata(L, 1);
... [70 more lines]

660→                break;
   661→        }
   662→
   663→        // Flush if batch is getting full
   664→        if (batch_vertex_count >= MAX_BATCH_VERTICES - 6) {
   665→            batch_flush();
   666→        }
   667→    }
   668→
   669→    // Final flush
   670→    batch_flush();
   671→
   672→    // Reset to default blend mode for screen blit
   673→    apply_blend_mode(BLEND_ALPHA);
   674→}
   675→
   676→// Find or create a named layer
   677→static Layer* layer_get_or_create(const char* name) {
   678→    // Check if layer already exists
   679→    for (int i = 0; i < layer_count; i++) {
   680→        if (strcmp(layer_names[i], name) == 0) {
   681→            return layer_registry[i];
   682→        }
   683→    }
   684→
   685→    // Create new layer
   686→    if (layer_count >= MAX_LAYERS) {
   687→        fprintf(stderr, "Error: Maximum number of layers (%d) reached\n", MAX_LAYERS);
   688→        return NULL;
   689→    }
... [20 more lines]

446:#define MAX_LAYERS 16
447:static Layer* layer_registry[MAX_LAYERS];
448:static char* layer_names[MAX_LAYERS];
686:    if (layer_count >= MAX_LAYERS) {
687:        fprintf(stderr, "Error: Maximum number of layers (%d) reached\n", MAX_LAYERS);

No matches found

1098-        if (diff < VSYNC_SNAP_TOLERANCE) {
1099-            dt = snap_frequencies[i];
1100-            break;
1101-        }
1102-    }
1103-
1104-    // Accumulate physics lag, capped to prevent spiral of death
1105-    physics_lag += dt;
1106-    if (physics_lag > PHYSICS_RATE * MAX_UPDATES) {
1107-        physics_lag = PHYSICS_RATE * MAX_UPDATES;
1108-    }
1109-
1110-    // Accumulate render lag, capped to prevent unbounded growth
1111-    render_lag += dt;
1112-    if (render_lag > RENDER_RATE * 2) {
1113-        render_lag = RENDER_RATE * 2;
1114-    }
1115-
1116-    // Process events every frame (not tied to fixed timestep)
1117-    SDL_Event event;
1118:    while (SDL_PollEvent(&event)) {
1119-        if (event.type == SDL_QUIT) {
1120-            running = false;
1121-        }
1122-        if (event.type == SDL_KEYDOWN) {
1123-            if (event.key.keysym.sym == SDLK_ESCAPE) {
1124-                running = false;
1125-            }
1126-            #ifndef __EMSCRIPTEN__
1127-            // Fullscreen toggle only on desktop
... [11 more lines]

840:static Uint64 last_time = 0;
841:static double physics_lag = 0.0;
842:static double render_lag = 0.0;

835→}
   836→
   837→// Main loop state (needed for emscripten)
   838→static bool running = true;
   839→static Uint64 perf_freq = 0;
   840→static Uint64 last_time = 0;
   841→static double physics_lag = 0.0;
   842→static double render_lag = 0.0;
   843→static Uint64 step = 0;
   844→static double game_time = 0.0;
   845→static Uint64 frame = 0;
   846→
   847→// VSync snap frequencies (computed at init based on display refresh rate)
   848→static double snap_frequencies[8];
   849→static int snap_frequency_count = 0;
   850→
   851→// Shader headers - prepended to all shaders based on platform
   852→#ifdef __EMSCRIPTEN__
   853→    #define SHADER_HEADER_VERT "#version 300 es\n"
   854→    #define SHADER_HEADER_FRAG "#version 300 es\nprecision mediump float;\n"
   855→#else
   856→    #define SHADER_HEADER_VERT "#version 330 core\n"
   857→    #define SHADER_HEADER_FRAG "#version 330 core\n"
   858→#endif
   859→
   860→// Shader sources (no version line - header prepended at compile time)
   861→static const char* vertex_shader_source =
   862→    "layout (location = 0) in vec2 aPos;\n"
   863→    "layout (location = 1) in vec2 aUV;\n"
   864→    "layout (location = 2) in vec4 aColor;\n"
... [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:
    50→
    51→// Transform stack depth
    52→#define MAX_TRANSFORM_DEPTH 32
    53→
    54→// Command queue capacity (fixed size, allocated once)
    55→// 16384 commands × ~64 bytes = ~1MB per layer
    56→#define MAX_COMMAND_CAPACITY 16384
    57→
    58→// Shape types
    59→enum {
    60→    SHAPE_RECTANGLE = 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:
    67→    BLEND_ALPHA = 0,
    68→    BLEND_ADDITIVE,
    69→};
    70→
    71→// DrawCommand — stores one deferred draw call
    72→// Explicitly padded to 64 bytes for consistent memory layout across platforms
    73→typedef struct {
    74→    uint8_t type;           // SHAPE_RECTANGLE, SHAPE_CIRCLE, SHAPE_SPRITE
    75→    uint8_t blend_mode;     // BLEND_ALPHA, BLEND_ADDITIVE, BLEND_MULTIPLY
    76→    uint8_t _pad[2];        // Padding to align next field to 4 bytes
    77→
    78→    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
    79→    uint32_t color;         // Packed RGBA (4 bytes)
    80→
    81→    // Shape parameters (meaning depends on type)
    82→    // RECTANGLE: params[0]=x, [1]=y, [2]=w, [3]=h
    83→    // CIRCLE: params[0]=x, [1]=y, [2]=radius
    84→    // SPRITE: params[0]=x, [1]=y, [2]=w, [3]=h, [4]=ox, [5]=oy (+ texture_id)
    85→    float params[6];        // 24 bytes (reduced from 8 to fit 64-byte target)
    86→
    87→    GLuint texture_id;      // For SPRITE (4 bytes)
    88→    // Total: 4 + 24 + 4 + 24 + 4 = 60 bytes, padded to 64
    89→    uint8_t _pad2[4];       // Explicit padding to reach 64 bytes
    90→} DrawCommand;
    91→
    92→// Layer
    93→typedef struct {
    94→    GLuint fbo;

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

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:
   171→    m[0] = 1.0f; m[1] = 0.0f; m[2] = 0.0f;  // row 0
   172→    m[3] = 0.0f; m[4] = 1.0f; m[5] = 0.0f;  // row 1
   173→    m[6] = 0.0f; m[7] = 0.0f; m[8] = 1.0f;  // row 2
   174→
   175→    // Initialize command queue (fixed size, never grows)
   176→    layer->commands = (DrawCommand*)malloc(MAX_COMMAND_CAPACITY * sizeof(DrawCommand));
   177→    if (!layer->commands) {
   178→        free(layer);
   179→        return NULL;
   180→    }
   181→    layer->command_count = 0;
   182→    layer->command_capacity = MAX_COMMAND_CAPACITY;
   183→    layer->current_blend = BLEND_ALPHA;
   184→
   185→    // Create FBO
   186→    glGenFramebuffers(1, &layer->fbo);
   187→    glBindFramebuffer(GL_FRAMEBUFFER, layer->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:
   230→    dest[0] = src[0]; dest[1] = src[1]; dest[2] = src[2];
   231→    dest[3] = src[3]; dest[4] = src[4]; dest[5] = src[5];
   232→}
   233→
   234→// Add a command to the layer's queue (returns pointer to the new command)
   235→// Returns NULL if queue is full (MAX_COMMAND_CAPACITY reached)
   236→static DrawCommand* layer_add_command(Layer* layer) {
   237→    if (layer->command_count >= layer->command_capacity) {
   238→        // Fixed size queue - don't grow, just drop the command
   239→        // This should never happen in normal use (16384 commands per frame is huge)
   240→        static bool warned = false;
   241→        if (!warned) {
   242→            fprintf(stderr, "Error: Command queue full (%d commands). Dropping draw calls.\n",
   243→                    layer->command_capacity);
   244→            warned = true;
   245→        }
   246→        return NULL;
   247→    }
   248→
   249→    DrawCommand* cmd = &layer->commands[layer->command_count++];
   250→    memset(cmd, 0, sizeof(DrawCommand));
   251→    cmd->blend_mode = layer->current_blend;
   252→    layer_copy_transform(layer, cmd->transform);
   253→    return cmd;
   254→}
   255→
   256→// Clear all commands (call at frame end after rendering)
   257→static void layer_clear_commands(Layer* layer) {
   258→    layer->command_count = 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:
   343→    C[7] = 0.0f;
   344→    C[8] = 1.0f;
   345→}
   346→
   347→// Push a transform onto the layer's stack
   348→// Builds TRS matrix (Translate * Rotate * Scale) and multiplies with current
   349→// Returns false if stack overflow (caller should error)
   350→static bool layer_push(Layer* layer, float x, float y, float r, float sx, float sy) {
   351→    if (layer->transform_depth >= MAX_TRANSFORM_DEPTH - 1) {
   352→        return false;  // Stack overflow
   353→    }
   354→
   355→    // Build TRS matrix: result of Translate(x,y) * Rotate(r) * Scale(sx,sy)
   356→    // [sx*cos  -sy*sin  x]
   357→    // [sx*sin   sy*cos  y]
   358→    // [   0        0    1]
   359→    float c = cosf(r);
   360→    float s = sinf(r);
   361→    float m[9] = {
   362→        sx * c, -sy * s, x,
   363→        sx * s,  sy * c, y,
   364→        0.0f,    0.0f,   1.0f
   365→    };
   366→
   367→    // Get parent transform
   368→    float* parent = layer_get_transform(layer);
   369→
   370→    // Increment depth
   371→    layer->transform_depth++;
... [12 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:
   764→    }
   765→    return 0;
   766→}
   767→
   768→static int l_layer_push(lua_State* L) {
   769→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   770→    float x = (float)luaL_optnumber(L, 2, 0.0);
   771→    float y = (float)luaL_optnumber(L, 3, 0.0);
   772→    float r = (float)luaL_optnumber(L, 4, 0.0);
   773→    float sx = (float)luaL_optnumber(L, 5, 1.0);
   774→    float sy = (float)luaL_optnumber(L, 6, 1.0);
   775→    if (!layer_push(layer, x, y, r, sx, sy)) {
   776→        return luaL_error(L, "Transform stack overflow (max depth: %d)", MAX_TRANSFORM_DEPTH);
   777→    }
   778→    return 0;
   779→}
   780→
   781→static int l_layer_pop(lua_State* L) {
   782→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   783→    layer_pop(layer);

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

843→    lua_register(L, "rgba", l_rgba);
   844→    lua_register(L, "set_shape_filter", l_set_shape_filter);
   845→}
   846→
   847→// Main loop state (needed for emscripten)
   848→static bool running = true;
   849→static Uint64 perf_freq = 0;
   850→static Uint64 last_time = 0;
   851→static double physics_lag = 0.0;
   852→static double render_lag = 0.0;
   853→static Uint64 step = 0;
   854→static double game_time = 0.0;
   855→static Uint64 frame = 0;
   856→
   857→// VSync snap frequencies (computed at init based on display refresh rate)
   858→static double snap_frequencies[8];
   859→static int snap_frequency_count = 0;
   860→
   861→// Shader headers - prepended to all shaders based on platform
   862→#ifdef __EMSCRIPTEN__

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:
   853→static Uint64 step = 0;
   854→static double game_time = 0.0;
   855→static Uint64 frame = 0;
   856→
   857→// VSync snap frequencies (computed at init based on display refresh rate)
   858→static double snap_frequencies[8];
   859→static int snap_frequency_count = 0;
   860→
   861→// Reset timing accumulators (call on focus gain, scene transitions, etc.)
   862→// This prevents accumulated lag from causing catch-up updates
   863→static void timing_resync(void) {
   864→    physics_lag = 0.0;
   865→    render_lag = 0.0;
   866→    last_time = SDL_GetPerformanceCounter();
   867→}
   868→
   869→// Shader headers - prepended to all shaders based on platform
   870→#ifdef __EMSCRIPTEN__
   871→    #define SHADER_HEADER_VERT "#version 300 es\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:
  1130→    if (render_lag > RENDER_RATE * 2) {
  1131→        render_lag = RENDER_RATE * 2;
  1132→    }
  1133→
  1134→    // Process events every frame (not tied to fixed timestep)
  1135→    SDL_Event event;
  1136→    while (SDL_PollEvent(&event)) {
  1137→        if (event.type == SDL_QUIT) {
  1138→            running = false;
  1139→        }
  1140→        if (event.type == SDL_KEYDOWN) {
  1141→            if (event.key.keysym.sym == SDLK_ESCAPE) {
  1142→                running = false;
  1143→            }
  1144→            #ifndef __EMSCRIPTEN__
  1145→            // Fullscreen toggle only on desktop
  1146→            if (event.key.keysym.sym == SDLK_F11 ||
  1147→                (event.key.keysym.sym == SDLK_RETURN && (event.key.keysym.mod & KMOD_ALT))) {
  1148→                Uint32 flags = SDL_GetWindowFlags(window);
  1149→                SDL_SetWindowFullscreen(window, (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP);
  1150→            }
  1151→            #endif
  1152→        }
  1153→        // Handle window focus events - resync timing to prevent catch-up stutter
  1154→        if (event.type == SDL_WINDOWEVENT) {
  1155→            if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
  1156→                timing_resync();
  1157→            }
  1158→        }
... [5 more lines]

835→    lua_register(L, "layer_circle", l_layer_circle);
   836→    lua_register(L, "layer_push", l_layer_push);
   837→    lua_register(L, "layer_pop", l_layer_pop);
   838→    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
   839→    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
   840→    lua_register(L, "texture_load", l_texture_load);
   841→    lua_register(L, "texture_get_width", l_texture_get_width);
   842→    lua_register(L, "texture_get_height", l_texture_get_height);
   843→    lua_register(L, "rgba", l_rgba);
   844→    lua_register(L, "set_shape_filter", l_set_shape_filter);
   845→}
   846→
   847→// Main loop state (needed for emscripten)
   848→static bool running = true;
   849→static Uint64 perf_freq = 0;

741-    uint32_t color = (uint32_t)luaL_checkinteger(L, 5);
742-    layer_add_circle(layer, x, y, radius, color);
743-    return 0;
744-}
745-
746-static int l_rgba(lua_State* L) {
747-    int r = (int)luaL_checkinteger(L, 1);
748-    int g = (int)luaL_checkinteger(L, 2);
749-    int b = (int)luaL_checkinteger(L, 3);
750-    int a = (int)luaL_optinteger(L, 4, 255);
751-    uint32_t color = ((r & 0xFF) << 24) | ((g & 0xFF) << 16) | ((b & 0xFF) << 8) | (a & 0xFF);
752-    lua_pushinteger(L, color);
753-    return 1;
754-}
755-
756:static int l_set_shape_filter(lua_State* L) {
757-    const char* mode = luaL_checkstring(L, 1);
758-    if (strcmp(mode, "smooth") == 0) {
759-        shape_filter_mode = FILTER_SMOOTH;
760-    } else if (strcmp(mode, "rough") == 0) {
761-        shape_filter_mode = FILTER_ROUGH;
762-    } else {
763-        return luaL_error(L, "Invalid filter mode: %s (use 'smooth' or 'rough')", mode);
764-    }
765-    return 0;
766-}
767-
768-static int l_layer_push(lua_State* L) {
769-    Layer* layer = (Layer*)lua_touserdata(L, 1);
770-    float x = (float)luaL_optnumber(L, 2, 0.0);
... [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:
    43→#define PHYSICS_RATE (1.0 / 120.0)  // 120 Hz physics/input timestep
    44→#define RENDER_RATE  (1.0 / 60.0)   // 60 Hz render cap (for chunky pixel movement)
    45→#define MAX_UPDATES 10              // Cap on fixed steps per frame (prevents spiral of death)
    46→
    47→// VSync snapping - snap delta times within 0.2ms of common refresh rates
    48→// This prevents accumulator drift from timer jitter
    49→#define VSYNC_SNAP_TOLERANCE 0.0002
    50→
    51→// Forward declaration for timing resync (defined with main loop state)
    52→static void timing_resync(void);
    53→
    54→// Transform stack depth
    55→#define MAX_TRANSFORM_DEPTH 32
    56→

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:
   755→    lua_pushinteger(L, color);
   756→    return 1;
   757→}
   758→
   759→static int l_set_shape_filter(lua_State* L) {
   760→    const char* mode = luaL_checkstring(L, 1);
   761→    if (strcmp(mode, "smooth") == 0) {
   762→        shape_filter_mode = FILTER_SMOOTH;
   763→    } else if (strcmp(mode, "rough") == 0) {
   764→        shape_filter_mode = FILTER_ROUGH;
   765→    } else {
   766→        return luaL_error(L, "Invalid filter mode: %s (use 'smooth' or 'rough')", mode);
   767→    }
   768→    return 0;
   769→}
   770→
   771→static int l_timing_resync(lua_State* L) {
   772→    (void)L;  // Unused
   773→    timing_resync();
   774→    return 0;
   775→}
   776→
   777→static int l_layer_push(lua_State* L) {
   778→    Layer* layer = (Layer*)lua_touserdata(L, 1);
   779→    float x = (float)luaL_optnumber(L, 2, 0.0);

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:
   848→    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
   849→    lua_register(L, "texture_load", l_texture_load);
   850→    lua_register(L, "texture_get_width", l_texture_get_width);
   851→    lua_register(L, "texture_get_height", l_texture_get_height);
   852→    lua_register(L, "rgba", l_rgba);
   853→    lua_register(L, "set_shape_filter", l_set_shape_filter);
   854→    lua_register(L, "timing_resync", l_timing_resync);
   855→}
   856→
   857→// Main loop state (needed for emscripten)
   858→static bool running = true;
   859→static Uint64 perf_freq = 0;

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

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

anchor.c
src/anchor.c(710): 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

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

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:
    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 (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;
... [7 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

Exit code 1
anchor.c
src/anchor.c(101): error C2143: syntax error: missing ')' before 'sizeof'
src/anchor.c(101): error C2143: syntax error: missing '{' before 'sizeof'
src/anchor.c(101): error C2059: syntax error: 'sizeof'
src/anchor.c(718): 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...
Build failed!

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:
    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;

anchor.c
src/anchor.c(722): 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

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

User has answered your questions: "For Phase 6 (Audio), which library do you lean toward: miniaudio (simpler, header-only) or SoLoud (more features like filters, 3D audio)?"="Undecided", "For Phase 7 (Physics), what pixel-to-meter scale do you want for Box2D? Common choices are 1:1 (1 pixel = 1 meter, simple but objects feel floaty) or scaled (e.g., 30 pixels = 1 meter, more realistic feel)."="Configurable, I have to check what values I used in my pixel games before with Anchor.", "For Phase 8 (Random), is deterministic replay support important? This affects whether we need save/restore RNG state and separate RNG streams for gameplay vs cosmetics."="Yes, important", "For Phase 10 (Object System), is `an` the tree root, or is there a separate root object that `an` references?"="Undecided, I need to consider how I'll handle engine function calls vs. the tree in more detail when we get there.". You can now continue with the user's answers in mind.

User has answered your questions: "For Phase 5 (Input), should action bindings be rebindable at runtime (for options menus), or just set once at startup?"="Runtime rebindable", "For Phase 9 (Text), do you want bitmap fonts (pixel-perfect, pre-rendered) or TTF rendering (scalable, more flexible)?"="Both", "For Phase 10 (Springs), what spring model do you prefer? Damped harmonic oscillator (stiffness + damping) or the simpler 'pull toward target' approach?"="We'll test different approaches when implementing.", "For Phase 4 (Effects), should shaders be hot-reloadable during development (file watch + reload), or is restart-to-test acceptable?"="Restart is fine". You can now continue with the user's answers in mind.

User has answered your questions: "For Phase 7 (Physics), do you need joints (constraints between bodies like hinges, ropes, springs)? Or just collision detection?"="Start simple", "For Phase 10 (Timers), should timer callbacks receive any arguments beyond self, like elapsed time or overshoot amount?"="I think just self, however we may explore alternatives when implementing it.", "For update order within a tree level (siblings), should it be creation order, explicit priority, or something else?"="Creation order", "For collision tags in Phase 7, should they be strings like the docs show, or integer flags/masks for performance?"="They have to map to whatever Box2D uses, but I'd like strings for readability. However, this is something we also need to discuss more when we get there.". You can now continue with the user's answers in mind.

User has answered your questions: "For error display (Phase 9 dependency), should the error screen show a stack trace, or just the error message?"="Full stack trace", "For Phase 11 (packaging), should the final executable embed all assets (single .exe), or ship with a data folder?"="Single executable", "Should the engine expose frame/step counters to Lua? Useful for deterministic effects, debugging."="Yes, expose them", "For web builds, should the engine automatically handle the audio context unlock (play silent audio on first click)?"="Undecided". You can now continue with the user's answers in mind.

File created successfully at: E:\a327ex\Anchor\reference\phase-review-findings.md

Command running in background with ID: b8eb0c3. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex-Anchor\tasks\b8eb0c3.output

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

340→- [x] Steps 1-10 verified on Windows and Web
   341→
   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 via fragment shaders.
   349→
   350→### 4.1 Effect Shader Framework
   351→- [ ] Post-process shader pipeline (render layer to texture, apply shader, output)
   352→- [ ] Effect parameter passing (uniforms)
   353→- [ ] Per-layer effect configuration
   354→
   355→### 4.2 Built-in Effects
   356→- [ ] **Outline** — edge detection, configurable color and thickness
   357→- [ ] **Tint** — multiply or blend toward a color
   358→- [ ] **Brightness** — multiply RGB values
   359→
   360→### 4.3 Custom Shaders
   361→- [ ] Load custom fragment shaders from file
   362→- [ ] Expose to Lua: `layer:set_shader(shader, params)`
   363→- [ ] Shader hot-reload during development (optional, nice-to-have)
   364→
   365→### 4.4 Lua Bindings
   366→```lua
   367→game:set_effect('outline', {color = 0x000000FF, thickness = 1})
   368→game:set_effect('tint', {color = 0xFF0000FF, mix = 0.5})
   369→game:set_effect('brightness', {factor = 1.5})
... [50 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:
   356→- [ ] **Outline** — edge detection, configurable color and thickness
   357→- [ ] **Tint** — multiply or blend toward a color
   358→- [ ] **Brightness** — multiply RGB values
   359→
   360→### 4.3 Custom Shaders
   361→- [ ] Load custom fragment shaders from file
   362→- [ ] Expose to Lua: `layer:set_shader(shader, params)`
   363→
   364→**Note:** Shader hot-reload not needed. Restart-to-test is acceptable.
   365→
   366→### 4.4 Lua Bindings
   367→```lua
   368→game:set_effect('outline', {color = 0x000000FF, thickness = 1})

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:
   387→- [ ] Keyboard state (down, pressed this frame, released this frame)
   388→- [ ] Mouse state (position, buttons, wheel)
   389→- [ ] Per-frame state transitions
   390→
   391→### 5.2 Binding System
   392→- [ ] Action → input mapping
   393→- [ ] Multiple inputs per action
   394→- [ ] Input string parsing: `key:a`, `key:space`, `mouse:1`, `mouse:wheel_up`
   395→- [ ] Runtime rebindable (for options menus)
   396→- [ ] Key capture support for rebinding UI
   397→
   398→### 5.3 Lua Bindings
   399→```lua
   400→an:input_bind('move_left', {'key:a', 'key:left'})

460→**Deliverable:** Audio with pitch shifting.
   461→
   462→---
   463→
   464→## Phase 7: Physics
   465→
   466→**Goal:** Box2D 3.1 with sensor/contact events and spatial queries.
   467→
   468→### 7.1 World Setup
   469→- [ ] Box2D world creation
   470→- [ ] Gravity configuration
   471→- [ ] Fixed timestep stepping (synced with game loop)
   472→
   473→### 7.2 Body Management
   474→- [ ] Body creation: static, dynamic, kinematic
   475→- [ ] Shape types: circle, rectangle, polygon
   476→- [ ] Return body ID to Lua (Lua manages lifetime)
   477→
   478→### 7.3 Collision Configuration
   479→- [ ] Collision tag system
   480→- [ ] Enable/disable contact between tag pairs
   481→- [ ] Enable/disable sensor between tag pairs
   482→
   483→### 7.4 Event System
   484→Box2D 3.1 provides:
   485→- **Sensor events** — overlap detection, no physics response
   486→- **Contact events** — physical collision with response
   487→- **Hit events** — high-speed impact data
   488→
   489→Implementation:
... [50 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:
   464→## Phase 7: Physics
   465→
   466→**Goal:** Box2D 3.1 with sensor/contact events and spatial queries.
   467→
   468→### 7.1 World Setup
   469→- [ ] Box2D world creation
   470→- [ ] Gravity configuration
   471→- [ ] Fixed timestep stepping (synced with game loop)
   472→- [ ] Configurable pixel-to-meter scale (check old Anchor values for reference)
   473→
   474→### 7.2 Body Management
   475→- [ ] Body creation: static, dynamic, kinematic
   476→- [ ] Shape types: circle, rectangle, polygon

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:
   475→- [ ] Body creation: static, dynamic, kinematic
   476→- [ ] Shape types: circle, rectangle, polygon
   477→- [ ] Return body ID to Lua (Lua manages lifetime)
   478→
   479→### 7.3 Collision Configuration
   480→- [ ] Collision tag system (string API for readability, maps to Box2D internally)
   481→- [ ] Enable/disable contact between tag pairs
   482→- [ ] Enable/disable sensor between tag pairs
   483→
   484→**Note:** Start with collision detection only. Add joints (hinges, ropes, etc.) if/when needed for specific games.
   485→
   486→### 7.4 Event System
   487→Box2D 3.1 provides:
   488→- **Sensor events** — overlap detection, no physics response

540→
   541→**Deliverable:** Full physics with events and queries.
   542→
   543→---
   544→
   545→## Phase 8: Random
   546→
   547→**Goal:** Seedable PRNG for deterministic gameplay.
   548→
   549→### 8.1 Implementation
   550→- [ ] PCG or xorshift PRNG (fast, good quality)
   551→- [ ] Seed function
   552→- [ ] State can be saved/restored for replays
   553→
   554→### 8.2 Lua Bindings
   555→```lua
   556→an:random_seed(12345)
   557→local x = an:random_float(0, 100)      -- [0, 100)
   558→local i = an:random_int(1, 10)         -- [1, 10] inclusive
   559→local r = an:random_angle()            -- [0, 2π)
   560→local s = an:random_sign()             -- -1 or 1
   561→local b = an:random_bool()             -- true or false
   562→local item = an:random_choice(array)   -- random element
   563→```
   564→
   565→**Deliverable:** Deterministic random.
   566→
   567→---
   568→
   569→## Phase 9: Text Rendering
... [10 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:
   541→**Deliverable:** Full physics with events and queries.
   542→
   543→---
   544→
   545→## Phase 8: Random
   546→
   547→**Goal:** Seedable PRNG for deterministic gameplay and replay support.
   548→
   549→### 8.1 Implementation
   550→- [ ] PCG or xorshift PRNG (fast, good quality)
   551→- [ ] Seed function
   552→- [ ] Save/restore RNG state (required for replays)
   553→- [ ] Consider separate streams for gameplay vs cosmetic RNG
   554→
   555→### 8.2 Lua Bindings
   556→```lua
   557→an:random_seed(12345)

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:
   566→**Deliverable:** Deterministic random.
   567→
   568→---
   569→
   570→## Phase 9: Text Rendering
   571→
   572→**Goal:** Font rendering with per-character effects (handled in YueScript).
   573→
   574→### 9.1 Font Loading (C Side)
   575→- [ ] Support both bitmap fonts (pixel-perfect) and TTF (scalable)
   576→- [ ] TTF: Load via stb_truetype, bake glyphs to texture atlas
   577→- [ ] Bitmap: Load from spritesheet with metrics file
   578→- [ ] Support multiple sizes per font (separate atlases)
   579→- [ ] Store glyph metrics (advance, bearing, size)
   580→- [ ] Error screen shows full stack trace (file:line for each call)
   581→
   582→### 9.2 Glyph Rendering (C Side)
   583→- [ ] Draw single glyph at position with transform and color
   584→- [ ] Return glyph metrics to Lua for layout

600→```lua
   601→-- Simple text (no effects)
   602→layer:draw_text('Hello', 'default', x, y, color)
   603→layer:draw_text('Score: 100', 'large', x, y, r, sx, sy, color)
   604→an:font_get_text_width('default', 'Hello')
   605→```
   606→
   607→**Deliverable:** Font loading and glyph rendering. Text effects built in YueScript.
   608→
   609→---
   610→
   611→## Phase 10: YueScript Object System
   612→
   613→**Goal:** Full object tree with operators, timers, springs, colliders.
   614→
   615→### 10.1 YueScript Build Integration
   616→- [ ] Install YueScript compiler
   617→- [ ] Add compilation step to build.bat
   618→- [ ] Use `-r` flag for line number preservation
   619→- [ ] Verify errors report correct .yue line numbers
   620→
   621→### 10.2 Base Object Class
   622→Implement in `yue/object.yue`:
   623→- Constructor with name/args
   624→- Tree operations: `add`, `remove`, `kill`
   625→- Tagging: `tag`, `is`, `all` / `A`
   626→- Links: `link` for horizontal dependencies
   627→- Operators: `^`, `/`, `+`, `>>`
   628→- Phase helpers: `U` (early), `L` (late), `X` (named)
   629→- `__inherited` hook to propagate operators to child classes
... [50 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:
   659→- Wraps Box2D body
   660→- Methods: `get_position`, `set_velocity`, `apply_impulse`, etc.
   661→- `destroy()` cleans up Box2D body when killed
   662→
   663→### 10.6 Update Loop Integration
   664→C calls into Lua each frame:
   665→1. Early phase — all `early_update` and `/ U` actions
   666→2. Main phase — all `update` and `/` actions
   667→3. Late phase — all `late_update` and `/ L` actions
   668→4. Cleanup — remove dead objects, call `destroy` hooks
   669→
   670→**Sibling update order:** Creation order (first added = first updated).
   671→
   672→**Timer callbacks:** Receive only `self` (may explore alternatives during implementation).
   673→
   674→### 10.7 Aliases
   675→```yuescript
   676→E = object

680→-- A is method alias for all()
   681→```
   682→
   683→**Deliverable:** Full object system matching ANCHOR.md specification.
   684→
   685→---
   686→
   687→## Phase Summary
   688→
   689→| Phase | Focus | Key Deliverable |
   690→|-------|-------|-----------------|
   691→| 1 | C Skeleton | OpenGL window + Lua + error handling |
   692→| 2 | Web Build | Emscripten/WebGL parity |
   693→| 3 | Rendering | Shapes, sprites, layers, blend modes |
   694→| 4 | Effects | Post-process shaders (outline, tint, custom) |
   695→| 5 | Input | Keyboard/mouse with action bindings |
   696→| 6 | Audio | Sound/music with pitch shifting |
   697→| 7 | Physics | Box2D 3.1 with events and queries |
   698→| 8 | Random | Seedable PRNG |
   699→| 9 | Text | TTF fonts, glyph rendering |
   700→| 10 | YueScript | Object tree, timers, springs, colliders |
   701→
   702→---
   703→
   704→## Open Decisions
   705→
   706→### Audio Library
   707→**Status:** Research required
   708→
   709→Compare miniaudio vs SoLoud:

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:
   679→X = (name, fn) -> {[name]: fn}
   680→-- A is method alias for all()
   681→```
   682→
   683→**Deliverable:** Full object system matching ANCHOR.md specification.
   684→
   685→---
   686→
   687→## Phase 11: Distribution & Polish
   688→
   689→**Goal:** Packaging, web edge cases, and final robustness.
   690→
   691→### 11.1 Asset Packaging
   692→- [ ] Single executable with embedded assets (zip-append or similar)
   693→- [ ] Asset extraction for modders (optional)
   694→
   695→### 11.2 Web Build Polish
   696→- [ ] Audio context unlock handling
   697→- [ ] Gamepad support via SDL2/Emscripten
   698→- [ ] Additional keyboard key capture (F1-F12, Tab, Backspace, etc.)
   699→- [ ] Final cross-browser testing
   700→
   701→### 11.3 Engine State Exposure
   702→- [ ] Expose frame counters to Lua: `an.frame`, `an.step`, `an.game_time`
   703→
   704→### 11.4 Robustness
   705→- [ ] Final error handling review
   706→- [ ] Edge case testing
   707→- [ ] Performance profiling
... [10 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:
   711→---
   712→
   713→## Phase Summary
   714→
   715→| Phase | Focus | Key Deliverable |
   716→|-------|-------|-----------------|
   717→| 1 | C Skeleton | OpenGL window + Lua + error handling |
   718→| 2 | Web Build | Emscripten/WebGL parity |
   719→| 3 | Rendering | Shapes, sprites, layers, blend modes |
   720→| 4 | Effects | Post-process shaders (outline, tint, custom) |
   721→| 5 | Input | Keyboard/mouse with action bindings (runtime rebindable) |
   722→| 6 | Audio | Sound/music with pitch shifting |
   723→| 7 | Physics | Box2D 3.1 with events and queries |
   724→| 8 | Random | Seedable PRNG with replay support |
   725→| 9 | Text | Bitmap + TTF fonts, glyph rendering |
   726→| 10 | YueScript | Object tree, timers, springs, colliders |
   727→| 11 | Distribution | Single-exe packaging, web polish, robustness |
   728→
   729→---
   730→
   731→## Open Decisions

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

No matches found

7:## Table of Contents
28:## Core Philosophy
93:## The Object Tree
206:## Lifecycle
262:## Colliders, Springs, and Timers
352:## Locality of Behavior
406:## Drawing
431:## Lua Syntax Features
765:## YueScript Alternative
953:## YueScript Class System Integration
1254:## Technology Stack
1265:## Rendering
1357:## Error Handling
1372:## Build and Distribution
1399:## File Structure
1442:## Performance Path
1454:## Deferred Features

1254→## Technology Stack
  1255→
  1256→- **Language:** C99 with Lua 5.4 scripting (YueScript compiled to Lua)
  1257→- **Window/Input:** SDL2
  1258→- **Audio:** TBD (miniaudio or SoLoud — needs pitch shifting support)
  1259→- **Graphics:** OpenGL 3.3 Core Profile (WebGL 2.0 compatible)
  1260→- **Physics:** Box2D 3.1
  1261→- **Platforms:** Windows, Web (Emscripten)
  1262→
  1263→---
  1264→
  1265→## Rendering
  1266→
  1267→Anchor uses OpenGL 3.3 Core Profile (WebGL 2.0 compatible) for rendering, targeting 480×270 or 640×360 base resolution (per-game configurable). The low resolution is rendered to a framebuffer texture, then scaled to fill the window while maintaining aspect ratio (letterboxing when needed), with nearest-neighbor filtering.
  1268→
  1269→### Layers
  1270→
  1271→Each layer is a framebuffer object (FBO). Draw commands are batched per layer:
  1272→
  1273→1. Lua calls `layer:circle()`, `layer:draw_image()`, etc.
  1274→2. Geometry is batched into vertex buffers (batch breaks on texture/shader/blend mode changes)
  1275→3. At end of frame, layers are rendered via draw calls
  1276→4. Post-processing shaders are applied per-layer
  1277→5. Layers composite to screen in creation order (first created = bottom, last = top)
  1278→
  1279→Layer order can be overridden if needed:
  1280→```lua
  1281→an:set_layer_order({'game', 'effects', 'ui'})
  1282→```
  1283→

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:
  1250→```
  1251→
  1252→---
  1253→
  1254→## Technology Stack
  1255→
  1256→- **Language:** C99 with Lua 5.4 scripting (YueScript compiled to Lua)
  1257→- **Window/Input:** SDL2
  1258→- **Audio:** TBD (miniaudio or SoLoud — needs pitch shifting support)
  1259→- **Graphics:** OpenGL 3.3 Core Profile (WebGL 2.0 compatible)
  1260→- **Physics:** Box2D 3.1
  1261→- **Platforms:** Windows, Web (Emscripten)
  1262→
  1263→---
  1264→
  1265→## Engine State
  1266→
  1267→The engine exposes timing and frame information to Lua:
  1268→
  1269→```lua
  1270→an.frame      -- Render frame count (increments each rendered frame at 60Hz)
  1271→an.step       -- Physics step count (increments each physics tick at 120Hz)
  1272→an.game_time  -- Accumulated game time in seconds
  1273→```
  1274→
  1275→Useful for:
  1276→- Deterministic effects (use `an.step` instead of random for consistent patterns)
  1277→- Debugging and profiling
  1278→- Replay systems (verify sync with step count)
... [8 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

/c/Users/adn/.claude/projects/E--a327ex-Anchor/5f69cbc9-aed4-4dd4-bd1f-211967d053b1.jsonl