Anchor Phase 6

Summary

Implemented Phase 6 (Audio) of the Anchor engine using miniaudio with stb_vorbis for OGG decoding.

API Design:

Discussed pitch shifting approaches — miniaudio uses resampling (same as SoLoud)
Chose miniaudio over SoLoud (single-header, fits monolithic style)
Designed API with per-play pitch for variation (e.g., 0.95-1.05 on hit sounds)
Master pitch for slow-mo multiplies with per-play: final = per_play × master
Separate master volumes for sounds and music (for options menu sliders)

Integrate miniaudio (Step 1):

Downloaded miniaudio.h to engine/include/
Windows header conflicts: Chord conflicted with wingdi.h, shutdown conflicted with winsock.h
- Fixed: Renamed to InputChord and engine_shutdown

Audio device initialization (Step 2):

Added ma_engine global, init in main(), uninit in engine_shutdown()

Sound loading and playback (Steps 3-4):

Implemented sound_load(path) and sound_play(sound, volume, pitch)
OGG loading failed initially — miniaudio needs stb_vorbis for Vorbis decoding
- Added stb_vorbis.c with MA_ENABLE_VORBIS define
- Macro conflicts (A, B, C) — fixed by placing stb_vorbis implementation at END of anchor.c
Sound playback hung/stopped working after a few plays
- Root cause: Calling ma_sound_uninit from audio thread's end callback
- Fixed: Sound instance pool (64 slots) with main-thread cleanup via sound_cleanup_finished()

Volume and music (Steps 5-9):

Implemented sound_set_volume(volume) — master volume for sound effects
Implemented music_load(path), music_play(music, loop), music_stop()
Implemented music_set_volume(volume) — master volume for music
Implemented audio_set_master_pitch(pitch) — affects all playing audio in real-time

Number Key Bug:

Keys 1-4 didn't work for volume controls
Root cause: SDL scancodes are ordered 1-9 then 0 (keyboard layout), not 0-9 sequentially
Fixed key_name_to_scancode to handle this correctly

Perceptual Volume:

Added linear_to_perceptual() helper using power curve (linear²)
Applied to sound_play, music_play, and music_set_volume
Makes volume sliders feel natural (human hearing is logarithmic)

Web Audio Context Unlock:

Added audio_try_unlock() function for Emscripten builds
Called on SDL_KEYDOWN, SDL_MOUSEBUTTONDOWN, and SDL_FINGERDOWN events
Browsers require user interaction before playing audio

Verification:

All features tested on Windows and Web
Phase 6 complete

Hi, Claude. Let's get started on phase 6.

Let me read the implementation plan to see what phase 6 involves.

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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→```
... [1197 more lines]

Phase 6 is Audio. The plan identifies this as needing research first:

Goal: Sound effects with pitch control, music playback.

Key requirement: Pitch shifting is essential (for game feel/juice — randomizing pitch on hits, etc.)

The plan lists three options to evaluate:

Library	Pitch Shifting	Effects	Complexity	Web Support
miniaudio	Yes (resampling)	Basic	Single header	Yes (Emscripten)
SoLoud	Yes (native)	Filters, 3D	Medium	Yes
SDL_mixer	Limited	None	Simple	Yes

From what I know:

miniaudio — Single-header C library, very popular, well-maintained. Pitch shifting works via resampling (set playback rate). Straightforward integration. Used by many indie games. Lightweight.

SoLoud — C++ library with C bindings. More feature-rich (filters, 3D audio, multiple backends). Native pitch control. More setup complexity. Good if you want effects like reverb later.

SDL_mixer — Already in the SDL ecosystem you're using, but pitch shifting isn't native — you'd need to implement it via resampling yourself or use a separate resampler. Probably not ideal given pitch is essential.

I'd lean toward miniaudio for this project — it's single-header (fits the monolithic anchor.c style), has proven Emscripten support, and handles pitch via sample rate changes. SoLoud is more powerful but adds C++ complexity.

Would you like me to:

Research miniaudio more deeply and prototype integration?
Do a deeper comparison of both libraries first?
Something else?

We're going to keep the audio system extremely simple for now. What's the difference between pitch shifting in both options?

For game sound effects, they're essentially the same technique: resampling.

How it works: Play the samples faster → pitch goes up. Play them slower → pitch goes down. A sound at 2.0x pitch plays in half the time at double the frequency.

miniaudio: You control this by setting the sample rate ratio on the data source. If your sound is 44100Hz and you tell miniaudio to play it at 52920Hz (1.2x), you get pitch = 1.2. It's manual but straightforward.

SoLoud: Exposes a clean setPitch(1.2) function that does the same math internally.

The difference that matters: API convenience. SoLoud gives you sound.setPitch(1.2). miniaudio requires you to calculate and set the sample rate yourself.

For short game SFX (hits, explosions, pickups), pitch-equals-speed is exactly what you want. The sound plays slightly faster when pitched up — this sounds natural and is how most games do it.

The only time you'd want pitch-without-speed-change (time stretching) is for music or long sounds, which requires more complex DSP (phase vocoder, granular synthesis). Neither library does this out of the box for real-time playback.

Given you want extremely simple: miniaudio with a thin wrapper that converts pitch to sample rate would work fine. You'd write something like:

void sound_play(Sound* sound, float volume, float pitch) {
    // pitch 1.0 = normal, 1.2 = 20% higher, 0.8 = 20% lower
    ma_sound_set_pitch(&sound->ma_sound, pitch);  // miniaudio actually has this now
    ma_sound_set_volume(&sound->ma_sound, volume);
    ma_sound_start(&sound->ma_sound);
}

(I should verify miniaudio's current API — it may have added a direct pitch setter since I last checked.)

I usually use pitch shifting on hit effects, death, etc, where the entire game slows down for a while, and thus sounds have to also do to give that wooooooooo downwards effect. Is the pitch shifting we're using going to do that?

Yes, that works. You're describing real-time pitch adjustment on playing sounds — not just starting a sound at a different pitch.

Both miniaudio and SoLoud let you call set_pitch() on a sound that's already playing, and it changes immediately. So when your game enters slow-mo:

Lower pitch on all currently playing sounds (1.0 → 0.5)
The sounds stretch out and drop in frequency — the "wooooooooo" effect
New sounds during slow-mo also play at 0.5 pitch
When slow-mo ends, bring pitch back up (or let those sounds finish and play new ones at normal pitch)

The resampling approach handles this naturally. You're just changing the playback rate while the sound is mid-play. The samples that were going to play in 1 second now take 2 seconds, and the frequency halves.

For implementation, you'd probably want:

-- Global pitch multiplier (1.0 = normal, 0.5 = slow-mo)
audio_set_master_pitch(0.5)

-- Affects all currently playing sounds AND new sounds
-- When slow-mo ends:
audio_set_master_pitch(1.0)

Or per-sound if you want some sounds (like UI) unaffected by slow-mo:

sound_set_pitch(hit_sound, 0.5)

This is standard game audio stuff — both libraries support it fine.

OK, what would the API look like for you? Let's assume we're using miniaudio.

Keeping it simple, following the existing API style (texture_load, layer_create, etc.):

-- Loading
local hit = sound_load('hit.ogg')      -- fully loaded into memory
local bgm = music_load('bgm.ogg')      -- streamed

-- Sound playback (fire-and-forget)
sound_play(hit)                        -- volume=1, pitch=1
sound_play(hit, 0.5, 1.2)              -- volume=0.5, pitch=1.2

-- Music (one track at a time)
music_play(bgm)                        -- play once
music_play(bgm, true)                  -- loop
music_stop()

-- Master controls
audio_set_master_volume(0.5)           -- 0 to 1
audio_set_master_pitch(0.5)            -- slow-mo: all playing sounds drop pitch

That's the minimal version. The master pitch is the key thing for slow-mo — it affects all currently playing sounds and any new sounds started while it's set.

Things I'd add if you want them:

-- Music extras
music_pause()
music_resume()
music_set_volume(0.5)                  -- separate from master
music_fade_out(1.0)                    -- fade over 1 second

-- Query
music_is_playing()
audio_get_master_pitch()

Things I'm deliberately NOT including:

Per-sound handles for individual control (adds complexity, master pitch covers slow-mo)
3D positional audio
Sound groups/buses
Effects (reverb, filters)

Does this API cover what you need, or are there things missing / things you'd cut?

I would like to be able to set volume for sound effects and music separately. So the user can have a slider in the menu for each, and then all sounds effects or music are affected.

Makes sense — standard options menu setup. Revised:

-- Loading
local hit = sound_load('hit.ogg')
local bgm = music_load('bgm.ogg')

-- Sound playback (fire-and-forget)
sound_play(hit)                        -- volume=1, pitch=1
sound_play(hit, 0.5, 1.2)              -- volume=0.5, pitch=1.2

-- Music (one track at a time)
music_play(bgm)                        -- play once
music_play(bgm, true)                  -- loop
music_stop()

-- Volume controls (for options menu sliders)
sound_set_volume(0.8)                  -- all sound effects
music_set_volume(0.5)                  -- music

-- Master pitch (for slow-mo, affects everything)
audio_set_master_pitch(0.5)

So the final volume of a sound effect is: per_play_volume * sound_master_volume * master_pitch_affects_this_too

And music is: music_volume

The pitch control stays global since slow-mo affects everything.

Want me to start implementing? I'd begin with:

Integrate miniaudio header
Audio device initialization
Sound loading and playback with volume/pitch
Then music, then the volume controls

Master pitch affects sound volume?

No, sorry — that was confusingly written. They're independent:

Volume:

Sound effect = per_play_volume × sound_master_volume
Music = music_master_volume

Pitch:

Everything = master_pitch (for slow-mo)

Pitch doesn't touch volume. I just mangled the explanation.

Okay. Change the implementation plan with the concrete steps you'll take given everything we just discussed.

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

844→## Phase 6: Audio
   845→
   846→**Goal:** Sound effects with pitch control, music playback.
   847→
   848→### 6.1 Library Selection (Research Required)
   849→
   850→**Options to evaluate:**
   851→
   852→| Library | Pitch Shifting | Effects | Complexity | Web Support |
   853→|---------|---------------|---------|------------|-------------|
   854→| miniaudio | Yes (resampling) | Basic | Single header | Yes (Emscripten) |
   855→| SoLoud | Yes (native) | Filters, 3D | Medium | Yes |
   856→| SDL_mixer | Limited | None | Simple | Yes |
   857→
   858→**Decision criteria:**
   859→- Must support pitch shifting immediately
   860→- Should support additional effects eventually (reverb, filters)
   861→- Must work with Emscripten for web builds
   862→
   863→### 6.2 Core Audio
   864→- [ ] Audio device initialization
   865→- [ ] Sound loading (WAV, OGG)
   866→- [ ] Music loading (OGG)
   867→- [ ] Web: handle audio context unlock (requires user interaction)
   868→
   869→### 6.3 Playback Features
   870→- [ ] Sound playback with volume
   871→- [ ] **Pitch shifting** (essential)
   872→- [ ] Music playback (loop, stop, fade)
   873→- [ ] Master volume control
... [70 more lines]

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   840→**Deliverable:** Full input system with actions, chords, sequences, holds, and rebinding support.
   841→
   842→---
   843→
   844→## Phase 6: Audio
   845→
   846→**Goal:** Sound effects with pitch control, music playback, separate volume controls for sounds and music.
   847→
   848→### Library Decision
   849→
   850→**miniaudio** — single-header C library. Pitch shifting via resampling (changing playback rate). Works with Emscripten. Fits the monolithic anchor.c style.
   851→
   852→### Architecture
   853→
   854→**Volume:** Two separate master volumes (for options menu sliders)
   855→- Sound effects: `per_play_volume × sound_master_volume`
   856→- Music: `music_master_volume`
   857→
   858→**Pitch:** Single global master pitch (for slow-mo effects)
   859→- Affects all currently playing sounds and music
   860→- Real-time adjustment — can change pitch on sounds mid-playback
   861→
   862→---
   863→
   864→### Implementation Steps
   865→
   866→**Step 1: Integrate miniaudio**
   867→- [ ] Download miniaudio.h to `engine/include/`
   868→- [ ] `#define MINIAUDIO_IMPLEMENTATION` in anchor.c
... [100 more lines]

Done. Updated Phase 6 with:

Library decision: miniaudio (no more "research required")
Architecture: Separate sound/music volumes, single master pitch for slow-mo
11 concrete implementation steps with checkboxes
Final API matching what we discussed
Verification checklist for Windows and Web

Ready to start Step 1 when you are.

Actually, would individual pitch per sounds be too hard to implement? I often randomize pitch around 0.95, 1.05, for most sounds to add variation.

Not hard at all — it's already in the API:

sound_play(hit, 1.0, 0.95 + random() * 0.1)  -- volume=1, pitch=0.95-1.05

The per-play pitch is the third argument. In miniaudio, you just call ma_sound_set_pitch() on each sound instance before playing.

The master pitch for slow-mo would multiply with it:

final_pitch = per_play_pitch × master_pitch

So a sound played at pitch 1.05 during slow-mo (master_pitch = 0.5) becomes 0.525.

This is the standard approach — per-sound variation is trivial, global slow-mo multiplies on top. No extra complexity.

OK, then change the implementation plan and the API to include this as well.

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   848→### Library Decision
   849→
   850→**miniaudio** — single-header C library. Pitch shifting via resampling (changing playback rate). Works with Emscripten. Fits the monolithic anchor.c style.
   851→
   852→### Architecture
   853→
   854→**Volume:** Two separate master volumes (for options menu sliders)
   855→- Sound effects: `per_play_volume × sound_master_volume`
   856→- Music: `music_master_volume`
   857→
   858→**Pitch:** Per-play pitch + global master pitch
   859→- Per-play pitch: variation for each sound (e.g., 0.95-1.05 for natural variation)
   860→- Master pitch: slow-mo effect, multiplies with per-play pitch
   861→- Final pitch = `per_play_pitch × master_pitch`
   862→- Real-time adjustment — master pitch change affects currently playing sounds
   863→
   864→---
   865→
   866→### Implementation Steps

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   925→- [ ] Test on Web: all features match Windows
   926→
   927→---
   928→
   929→### Lua API
   930→
   931→```lua
   932→-- Loading
   933→local hit = sound_load('hit.ogg')
   934→local bgm = music_load('bgm.ogg')
   935→
   936→-- Sound playback (fire-and-forget)
   937→sound_play(hit)                                -- volume=1, pitch=1
   938→sound_play(hit, 0.5, 1.2)                      -- volume=0.5, pitch=1.2
   939→sound_play(hit, 1.0, 0.95 + random() * 0.1)   -- random pitch 0.95-1.05
   940→
   941→-- Music (one track at a time)
   942→music_play(bgm)                        -- play once
   943→music_play(bgm, true)                  -- loop
   944→music_stop()
   945→
   946→-- Volume controls (for options menu sliders)
   947→sound_set_volume(0.8)                  -- all sound effects
   948→music_set_volume(0.5)                  -- music
   949→
   950→-- Master pitch (for slow-mo, multiplies with per-play pitch)
   951→audio_set_master_pitch(0.5)            -- all audio plays at half speed/pitch
   952→audio_set_master_pitch(1.0)            -- back to normal
   953→```
... [4 more lines]

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   880→- [ ] Load WAV and OGG (miniaudio has built-in decoders)
   881→- [ ] Store `ma_sound` in Sound struct
   882→- [ ] Lua binding
   883→
   884→**Step 4: Sound playback**
   885→- [ ] `sound_play(sound)` — play at volume=1, pitch=1
   886→- [ ] `sound_play(sound, volume, pitch)` — play with per-play volume and pitch
   887→- [ ] Per-play pitch for variation (e.g., random 0.95-1.05)
   888→- [ ] Multiple simultaneous plays of same sound (need sound instances/cloning)
   889→- [ ] Lua binding
   890→
   891→**Step 5: Sound master volume**
   892→- [ ] `sound_set_volume(volume)` — 0 to 1, affects all sound effects
   893→- [ ] Store as global, apply when playing sounds

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   908→**Step 8: Music master volume**
   909→- [ ] `music_set_volume(volume)` — 0 to 1
   910→- [ ] Lua binding
   911→
   912→**Step 9: Master pitch (slow-mo)**
   913→- [ ] `audio_set_master_pitch(pitch)` — affects all audio
   914→- [ ] Multiplies with per-play pitch: `final = per_play_pitch × master_pitch`
   915→- [ ] Must work on currently playing sounds (real-time adjustment)
   916→- [ ] Lua binding
   917→
   918→**Step 10: Web audio context unlock**
   919→- [ ] Handle browser requirement for user interaction before audio
   920→- [ ] Unlock on first input event (key/mouse/touch)

Done. Updated:

Architecture section: Clarified per-play pitch + master pitch multiplication
Step 4: Added per-play pitch for variation
Step 9: Added the formula final = per_play_pitch × master_pitch
API example: Added sound_play(hit, 1.0, 0.95 + random() * 0.1) pattern

OK, let's get started. Let me test after each step is done.

Starting Step 1: Integrate miniaudio.

WebFetch (https://raw.githubusercontent.com/mackron/miniaudio/master/miniaudio.h)

# Miniaudio Library Overview

Miniaudio is a single-header audio library offering both low-level and high-level APIs for audio playback, capture, mixing, and effects processing.

## Key Features

**Low-Level API**: Provides direct access to raw audio device data through callbacks, supporting playback, capture, full-duplex, and loopback modes with device enumeration capabilities.

**High-Level API**: Consists of three main components:

- Resource management for loading and streaming sounds
- Node graph system for mixing and effect processing  
- Engine wrapper that simplifies complex audio tasks

## Core Capabilities

The library supports multiple audio formats (f32, s16, s24, s32, u8) and handles spatial audio with 3D positioning, attenuation models, and doppler effects. Sounds can be loaded synchronously or asynchronously, decoded at load time or dynamically, and organized into mixing groups.

## Platform Support

Miniaudio compiles cleanly across Windows, macOS, iOS, Linux, BSD, Android, and Emscripten without requiring external dependencies. Platform-specific backends include WASAPI, DirectSound, Core Audio, ALSA, PulseAudio, AAudio, and Web Audio.

## Configuration

The library uses a config/init pattern throughout, allowing transparent object allocation and flexible customization via compiler flags to enable/disable specific backends and features.

WebFetch summarized instead of returning the raw file. Let me download it directly.

Bash (curl -L -o /e/a327ex/Anchor/engine/include/miniaudio.h https://raw.githubusercon...)

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0   0     0   0     0     0     0  --:--:-- --:--:-- --:--:--     0
100  4003k 100  4003k   0     0  7723k     0  --:--:-- --:--:-- --:--:--  7743k

Bash (ls -la /e/a327ex/Anchor/engine/include/miniaudio.h)

-rw-r--r-- 1 adn 197121 4099492 Jan  8 20:57 /e/a327ex/Anchor/engine/include/miniaudio.h

Good, 4MB downloaded. Now let me add the implementation define to anchor.c.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

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>
... [50 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
    30→#include <lua.h>
    31→#include <lualib.h>
    32→#include <lauxlib.h>
    33→
    34→#define STB_IMAGE_IMPLEMENTATION
    35→#include <stb_image.h>
    36→
    37→#define MINIAUDIO_IMPLEMENTATION
    38→#include <miniaudio.h>
    39→
    40→#define WINDOW_TITLE "Anchor"
    41→#define GAME_WIDTH 480
    42→#define GAME_HEIGHT 270

Now let's build and verify it compiles.

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

Exit code 1
anchor.c
src/anchor.c(644): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(638): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(975): error C2365: 'Chord': redefinition; previous definition was 'function'
C:\Program Files (x86)\Windows Kits\10\\include\10.0.26100.0\\um\wingdi.h(3866): note: see declaration of 'Chord'
src/anchor.c(977): error C2061: syntax error: identifier 'chords'
src/anchor.c(977): error C2059: syntax error: ';'
src/anchor.c(977): error C2059: syntax error: '['
src/anchor.c(1028): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1244): error C2143: syntax error: missing '{' before '*'
src/anchor.c(1246): error C2065: 'chords': undeclared identifier
src/anchor.c(1246): error C2109: subscript requires array or pointer type
src/anchor.c(1246): error C2168: 'strcmp': too few actual parameters for intrinsic function
src/anchor.c(1247): error C2065: 'chords': undeclared identifier
src/anchor.c(1247): error C2109: subscript requires array or pointer type
src/anchor.c(1247): warning C4033: 'chord_find' must return a value
src/anchor.c(1254): error C2143: syntax error: missing ')' before '*'
src/anchor.c(1254): error C2143: syntax error: missing '{' before '*'
src/anchor.c(1254): error C2059: syntax error: ')'
src/anchor.c(1254): error C2054: expected '(' to follow 'chord'
src/anchor.c(1265): error C2143: syntax error: missing ')' before '*'
src/anchor.c(1265): error C2143: syntax error: missing '{' before '*'
src/anchor.c(1265): error C2059: syntax error: ')'
src/anchor.c(1265): error C2054: expected '(' to follow 'chord'
src/anchor.c(1272): error C2143: syntax error: missing ')' before '*'
src/anchor.c(1272): error C2143: syntax error: missing '{' before '*'
src/anchor.c(1272): error C2059: syntax error: ')'
src/anchor.c(1272): error C2054: expected '(' to follow 'chord'
src/anchor.c(1281): error C2065: 'chords': undeclared identifier
... [49 more lines]

Name conflicts with Windows headers that miniaudio pulls in. Need to rename:

Chord → conflicts with wingdi.h
shutdown → conflicts with winsock.h

Let me fix these.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

970→typedef struct {
   971→    char name[MAX_ACTION_NAME];
   972→    char action_names[MAX_ACTIONS_PER_CHORD][MAX_ACTION_NAME];
   973→    int action_count;
   974→    bool was_down;  // For edge detection
   975→} Chord;
   976→
   977→static Chord chords[MAX_CHORDS];
   978→static int chord_count = 0;
   979→
   980→// Sequence: series of actions that must be pressed in order within time windows
   981→#define MAX_SEQUENCE_STEPS 8
   982→#define MAX_SEQUENCES 32
   983→
   984→typedef struct {
   985→    char name[MAX_ACTION_NAME];
   986→    char action_names[MAX_SEQUENCE_STEPS][MAX_ACTION_NAME];
   987→    float delays[MAX_SEQUENCE_STEPS];  // Time window after each step (delay[i] = time allowed after step i)
   988→    int step_count;
   989→    int current_step;       // Which step we're waiting for (0 = first action)
   990→    float last_press_time;  // When last step was completed
   991→    bool just_fired;        // True for one frame when sequence completes
   992→    bool was_fired;         // For is_released edge detection
   993→} Sequence;
   994→
   995→static Sequence sequences[MAX_SEQUENCES];
   996→static int sequence_count = 0;
   997→
   998→// Hold: action that triggers after being held for a duration
   999→#define MAX_HOLDS 32
... [20 more lines]

Grep (^static void shutdown()

3107:static void shutdown(void) {

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. All occurrences of '} Chord;' were successfully replaced with '} InputChord;'.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. All occurrences of 'static Chord chords' were successfully replaced with 'static InputChord chords'.

Grep (Chord*)

1244:static Chord* chord_find(const char* name) {
1254:static bool chord_is_down(Chord* chord) {
1265:static bool chord_is_pressed(Chord* chord) {
1272:static bool chord_is_released(Chord* chord) {
1294:    Chord* chord = chord_find(name);
1549:    Chord* chord = chord_find(name);
1564:    Chord* chord = chord_find(name);
1579:    Chord* chord = chord_find(name);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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

Now fix the shutdown function name.

Grep (shutdown()

3107:static void shutdown(void) {
3444:        shutdown();
3493:        shutdown();
3500:        shutdown();
3511:        shutdown();
3527:        shutdown();
3576:        shutdown();
3615:        shutdown();
3684:    shutdown();

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

The file E:\a327ex\Anchor\engine\src\anchor.c has been updated. All occurrences of 'shutdown()' were successfully replaced with 'engine_shutdown()'.

Grep (static void shutdown)

3107:static void shutdown(void) {

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3103→    luaL_traceback(L, L, msg, 1);
  3104→    return 1;
  3105→}
  3106→
  3107→static void engine_shutdown(void) {
  3108→    // Game rendering resources
  3109→    if (vbo) { glDeleteBuffers(1, &vbo); vbo = 0; }
  3110→    if (vao) { glDeleteVertexArrays(1, &vao); vao = 0; }
  3111→    if (shader_program) { glDeleteProgram(shader_program); shader_program = 0; }

Now let's try building again.

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(644): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(638): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1028): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1306): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1312): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1422): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1431): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1525): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1527): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2172): 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

Step 1 complete. Build successful.

I had to rename two things to avoid Windows header conflicts:

Chord → InputChord (Windows wingdi.h has a Chord function)
shutdown → engine_shutdown (Windows winsock.h has a shutdown function)

You can test that the engine still runs correctly before I move on to Step 2.

OK, you can move on.

Starting Step 2: Audio device initialization.

Grep (SDL_Init)

3466:    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_GAMECONTROLLER) < 0) {
3467:        fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
3468-        return 1;
3469-    }
3470-
3471-    #ifdef __EMSCRIPTEN__
3472-    // Request WebGL 2.0 (OpenGL ES 3.0)

Read (E:\a327ex\Anchor\engine\src\anchor.c)

195→    if (!layer) return NULL;
   196→
   197→    layer->width = width;
   198→    layer->height = height;
   199→
   200→    // Initialize transform stack with identity matrix at depth 0
   201→    layer->transform_depth = 0;
   202→    float* m = layer->transform_stack;
   203→    m[0] = 1.0f; m[1] = 0.0f; m[2] = 0.0f;  // row 0
   204→    m[3] = 0.0f; m[4] = 1.0f; m[5] = 0.0f;  // row 1
   205→    m[6] = 0.0f; m[7] = 0.0f; m[8] = 1.0f;  // row 2
   206→
   207→    // Initialize command queue (fixed size, never grows)
   208→    layer->commands = (DrawCommand*)malloc(MAX_COMMAND_CAPACITY * sizeof(DrawCommand));
   209→    if (!layer->commands) {
   210→        free(layer);
   211→        return NULL;
   212→    }
   213→    layer->command_count = 0;
   214→    layer->command_capacity = MAX_COMMAND_CAPACITY;
   215→    layer->current_blend = BLEND_ALPHA;
   216→
   217→    // Create FBO
   218→    glGenFramebuffers(1, &layer->fbo);
   219→    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
   220→
   221→    // Create color texture
   222→    glGenTextures(1, &layer->color_texture);
   223→    glBindTexture(GL_TEXTURE_2D, layer->color_texture);
   224→    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
... [30 more lines]

Grep (^static .+ = )

390:static int shape_filter_mode = FILTER_SMOOTH;
393:static int batch_vertex_count = 0;
394:static GLuint current_batch_texture = 0;  // Currently bound texture for batching
522:static SDL_Window* window = NULL;
523:static SDL_GLContext gl_context = NULL;
524:static lua_State* L = NULL;
525:static bool error_state = false;
526:static char error_message[4096] = {0};
529:static GLuint shader_program = 0;
530:static GLuint vao = 0;
531:static GLuint vbo = 0;
537:static int layer_count = 0;
540:static GLuint screen_shader = 0;
541:static GLuint screen_vao = 0;
542:static GLuint screen_vbo = 0;
552:static int layer_draw_count = 0;
555:static bool keys_current[SDL_NUM_SCANCODES] = {0};
556:static bool keys_previous[SDL_NUM_SCANCODES] = {0};
560:static bool mouse_buttons_current[MAX_MOUSE_BUTTONS] = {0};
561:static bool mouse_buttons_previous[MAX_MOUSE_BUTTONS] = {0};
562:static int mouse_x = 0, mouse_y = 0;           // Window coordinates
563:static int mouse_dx = 0, mouse_dy = 0;         // Delta this frame
564:static int mouse_wheel_x = 0, mouse_wheel_y = 0; // Wheel delta this frame
567:static SDL_GameController* gamepad = NULL;
568:static bool gamepad_buttons_current[SDL_CONTROLLER_BUTTON_MAX] = {0};
569:static bool gamepad_buttons_previous[SDL_CONTROLLER_BUTTON_MAX] = {0};
570:static float gamepad_axes[SDL_CONTROLLER_AXIS_MAX] = {0};
571:static float gamepad_axes_previous[SDL_CONTROLLER_AXIS_MAX] = {0};
572:static float gamepad_deadzone = 0.2f;  // Default deadzone for axis→button conversion
581:static InputType last_input_type = INPUT_TYPE_KEYBOARD;
... [2 more lines]

Read (E:\a327ex\Anchor\engine\src\anchor.c)

575→typedef enum {
   576→    INPUT_TYPE_KEYBOARD,
   577→    INPUT_TYPE_MOUSE,
   578→    INPUT_TYPE_GAMEPAD,
   579→} InputType;
   580→
   581→static InputType last_input_type = INPUT_TYPE_KEYBOARD;
   582→
   583→static const char* input_type_to_string(InputType type) {
   584→    switch (type) {
   585→        case INPUT_TYPE_KEYBOARD: return "keyboard";
   586→        case INPUT_TYPE_MOUSE: return "mouse";
   587→        case INPUT_TYPE_GAMEPAD: return "gamepad";
   588→        default: return "keyboard";
   589→    }
   590→}
   591→
   592→// Rebinding capture mode
   593→static bool capture_mode = false;
   594→static char captured_control[64] = {0};  // Stores captured control string like "key:space"
   595→
   596→static void input_start_capture(void) {
   597→    capture_mode = true;
   598→    captured_control[0] = '\0';
   599→}
   600→
   601→static const char* input_get_captured(void) {
   602→    if (captured_control[0] != '\0') {
   603→        return captured_control;
   604→    }

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   577→    INPUT_TYPE_MOUSE,
   578→    INPUT_TYPE_GAMEPAD,
   579→} InputType;
   580→
   581→static InputType last_input_type = INPUT_TYPE_KEYBOARD;
   582→
   583→// Audio (miniaudio)
   584→static ma_engine audio_engine;
   585→static bool audio_initialized = false;
   586→static float sound_master_volume = 1.0f;
   587→static float music_master_volume = 1.0f;
   588→static float audio_master_pitch = 1.0f;
   589→
   590→static const char* input_type_to_string(InputType type) {
   591→    switch (type) {
   592→        case INPUT_TYPE_KEYBOARD: return "keyboard";
   593→        case INPUT_TYPE_MOUSE: return "mouse";
   594→        case INPUT_TYPE_GAMEPAD: return "gamepad";

Now add initialization. Let me find a good spot after SDL window creation.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

3515→    int version = gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
  3516→    if (version == 0) {
  3517→        fprintf(stderr, "gladLoadGL failed\n");
  3518→        engine_shutdown();
  3519→        return 1;
  3520→    }
  3521→    printf("OpenGL %d.%d loaded\n", GLAD_VERSION_MAJOR(version), GLAD_VERSION_MINOR(version));
  3522→    #else
  3523→    printf("WebGL 2.0 (OpenGL ES 3.0) context created\n");
  3524→    #endif
  3525→    printf("Renderer: %s\n", glGetString(GL_RENDERER));
  3526→
  3527→    glEnable(GL_BLEND);
  3528→    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  3529→
  3530→    // Create shader program
  3531→    shader_program = create_shader_program(vertex_shader_source, fragment_shader_source);
  3532→    if (!shader_program) {
  3533→        fprintf(stderr, "Failed to create shader program\n");
  3534→        engine_shutdown();
  3535→        return 1;
  3536→    }
  3537→    printf("Shader program created\n");
  3538→
  3539→    // Set up VAO and VBO for dynamic quad rendering
  3540→    // Vertex format: x, y, u, v, r, g, b, a, type, shape[4] (13 floats per vertex)
  3541→    glGenVertexArrays(1, &vao);
  3542→    glGenBuffers(1, &vbo);
  3543→
  3544→    glBindVertexArray(vao);
... [20 more lines]

Grep (luaL_openlibs)

3625:    luaL_openlibs(L);
3626-    register_lua_bindings(L);
3627-
3628-    // Initialize gamepad (check for already-connected controllers)
3629-    for (int i = 0; i < SDL_NumJoysticks(); i++) {
3630-        if (SDL_IsGameController(i)) {
3631-            gamepad = SDL_GameControllerOpen(i);
3632-            if (gamepad) {
3633-                printf("Gamepad found at startup: %s\n", SDL_GameControllerName(gamepad));
3634-                break;  // Only use first gamepad
3635-            }
3636-        }
3637-    }
3638-
3639-    // Load and run script with traceback
3640-    lua_pushcfunction(L, traceback);
3641-    int err_handler = lua_gettop(L);
3642-    if (luaL_loadfile(L, "main.lua") != LUA_OK) {
3643-        snprintf(error_message, sizeof(error_message), "%s", lua_tostring(L, -1));
3644-        fprintf(stderr, "ERROR: %s\n", error_message);
3645-        lua_pop(L, 2);  // error + traceback

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3624→    }
  3625→    luaL_openlibs(L);
  3626→    register_lua_bindings(L);
  3627→
  3628→    // Initialize gamepad (check for already-connected controllers)
  3629→    for (int i = 0; i < SDL_NumJoysticks(); i++) {
  3630→        if (SDL_IsGameController(i)) {
  3631→            gamepad = SDL_GameControllerOpen(i);
  3632→            if (gamepad) {
  3633→                printf("Gamepad found at startup: %s\n", SDL_GameControllerName(gamepad));
  3634→                break;  // Only use first gamepad
  3635→            }
  3636→        }
  3637→    }
  3638→
  3639→    // Initialize audio (miniaudio)
  3640→    ma_result result = ma_engine_init(NULL, &audio_engine);
  3641→    if (result != MA_SUCCESS) {
  3642→        fprintf(stderr, "Failed to initialize audio engine: %d\n", result);
  3643→        // Continue without audio - not a fatal error
  3644→    } else {
  3645→        audio_initialized = true;
  3646→        printf("Audio engine initialized\n");
  3647→    }
  3648→
  3649→    // Load and run script with traceback
  3650→    lua_pushcfunction(L, traceback);
  3651→    int err_handler = lua_gettop(L);
  3652→    if (luaL_loadfile(L, "main.lua") != LUA_OK) {
... [1 more lines]

Now add cleanup in engine_shutdown().

Read (E:\a327ex\Anchor\engine\src\anchor.c)

3107→// Error handler that adds stack trace
  3108→static int traceback(lua_State* L) {
  3109→    const char* msg = lua_tostring(L, 1);
  3110→    luaL_traceback(L, L, msg, 1);
  3111→    return 1;
  3112→}
  3113→
  3114→static void engine_shutdown(void) {
  3115→    // Game rendering resources
  3116→    if (vbo) { glDeleteBuffers(1, &vbo); vbo = 0; }
  3117→    if (vao) { glDeleteVertexArrays(1, &vao); vao = 0; }
  3118→    if (shader_program) { glDeleteProgram(shader_program); shader_program = 0; }
  3119→    // Layers
  3120→    for (int i = 0; i < layer_count; i++) {
  3121→        layer_destroy(layer_registry[i]);
  3122→        free(layer_names[i]);
  3123→        layer_registry[i] = NULL;
  3124→        layer_names[i] = NULL;
  3125→    }
  3126→    layer_count = 0;
  3127→    // Screen blit resources
  3128→    if (screen_vbo) { glDeleteBuffers(1, &screen_vbo); screen_vbo = 0; }
  3129→    if (screen_vao) { glDeleteVertexArrays(1, &screen_vao); screen_vao = 0; }
  3130→    if (screen_shader) { glDeleteProgram(screen_shader); screen_shader = 0; }
  3131→    // Other resources
  3132→    if (L) { lua_close(L); L = NULL; }
  3133→    if (gl_context) { SDL_GL_DeleteContext(gl_context); gl_context = NULL; }
  3134→    if (window) { SDL_DestroyWindow(window); window = NULL; }
  3135→    SDL_Quit();
  3136→}
... [10 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3127→    // Screen blit resources
  3128→    if (screen_vbo) { glDeleteBuffers(1, &screen_vbo); screen_vbo = 0; }
  3129→    if (screen_vao) { glDeleteVertexArrays(1, &screen_vao); screen_vao = 0; }
  3130→    if (screen_shader) { glDeleteProgram(screen_shader); screen_shader = 0; }
  3131→    // Audio
  3132→    if (audio_initialized) {
  3133→        ma_engine_uninit(&audio_engine);
  3134→        audio_initialized = false;
  3135→    }
  3136→    // Other resources
  3137→    if (L) { lua_close(L); L = NULL; }
  3138→    if (gl_context) { SDL_GL_DeleteContext(gl_context); gl_context = NULL; }
  3139→    if (window) { SDL_DestroyWindow(window); window = NULL; }
  3140→    SDL_Quit();
  3141→}
  3142→
  3143→// One frame of the main loop
  3144→static void main_loop_iteration(void) {
  3145→    Uint64 current_time = SDL_GetPerformanceCounter();

Now let's build and test.

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(651): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(645): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1035): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1313): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1319): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1429): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1438): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1532): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1534): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2179): 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

Step 2 complete. Build successful.

When you run the engine, you should see "Audio engine initialized" in the console output. The engine should run and shut down cleanly. You can test it now.

Yes, next step.

Step 3: Sound loading.

Let me look at how textures are handled for reference on the userdata pattern.

Grep (texture_load)

152-
153-// Load a texture from file using stb_image
154:static Texture* texture_load(const char* path) {
155-    int width, height, channels;
156-    stbi_set_flip_vertically_on_load(0);  // Don't flip - we handle Y in our coordinate system
157-    unsigned char* data = stbi_load(path, &width, &height, &channels, 4);  // Force RGBA
158-    if (!data) {
159-        fprintf(stderr, "Failed to load texture: %s\n", path);
160-        return NULL;
161-    }
162-
163-    Texture* tex = (Texture*)malloc(sizeof(Texture));
164-    if (!tex) {
165-        stbi_image_free(data);
166-        return NULL;
167-    }
168-
169-    tex->width = width;
170-    tex->height = height;
171-
172-    glGenTextures(1, &tex->id);
173-    glBindTexture(GL_TEXTURE_2D, tex->id);
174-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
175-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
176-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
177-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
178-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
179-    glBindTexture(GL_TEXTURE_2D, 0);
180-
181-    stbi_image_free(data);
... [73 more lines]

Read (E:\a327ex\Anchor\engine\src\anchor.c)

140→    int command_capacity;
   141→
   142→    // Current state
   143→    uint8_t current_blend;
   144→} Layer;
   145→
   146→// Texture
   147→typedef struct {
   148→    GLuint id;
   149→    int width;
   150→    int height;
   151→} Texture;
   152→
   153→// Load a texture from file using stb_image
   154→static Texture* texture_load(const char* path) {
   155→    int width, height, channels;
   156→    stbi_set_flip_vertically_on_load(0);  // Don't flip - we handle Y in our coordinate system
   157→    unsigned char* data = stbi_load(path, &width, &height, &channels, 4);  // Force RGBA
   158→    if (!data) {
   159→        fprintf(stderr, "Failed to load texture: %s\n", path);

I'll add the Sound struct and loading function after Texture. I'll combine Steps 3 and 4 since they're closely related.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

180→
   181→    stbi_image_free(data);
   182→    printf("Loaded texture: %s (%dx%d)\n", path, width, height);
   183→    return tex;
   184→}
   185→
   186→static void texture_destroy(Texture* tex) {
   187→    if (!tex) return;
   188→    if (tex->id) glDeleteTextures(1, &tex->id);
   189→    free(tex);
   190→}
   191→
   192→// Create a layer with FBO at specified resolution
   193→static Layer* layer_create(int width, int height) {
   194→    Layer* layer = (Layer*)calloc(1, sizeof(Layer));
   195→    if (!layer) return NULL;
   196→
   197→    layer->width = width;
   198→    layer->height = height;
   199→

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   182→    printf("Loaded texture: %s (%dx%d)\n", path, width, height);
   183→    return tex;
   184→}
   185→
   186→static void texture_destroy(Texture* tex) {
   187→    if (!tex) return;
   188→    if (tex->id) glDeleteTextures(1, &tex->id);
   189→    free(tex);
   190→}
   191→
   192→// Sound - stores path for fire-and-forget playback
   193→// Each play creates a new ma_sound instance that self-destructs when done
   194→#define MAX_SOUND_PATH 256
   195→
   196→typedef struct {
   197→    char path[MAX_SOUND_PATH];
   198→} Sound;
   199→
   200→static Sound* sound_load(const char* path) {
   201→    Sound* sound = (Sound*)malloc(sizeof(Sound));
   202→    if (!sound) return NULL;
   203→
   204→    strncpy(sound->path, path, MAX_SOUND_PATH - 1);
   205→    sound->path[MAX_SOUND_PATH - 1] = '\0';
   206→
   207→    // Verify the file can be loaded by attempting to init a sound
   208→    // This also pre-caches the decoded audio in miniaudio's resource manager
   209→    if (audio_initialized) {
   210→        ma_sound test_sound;
... [56 more lines]

Now let me add the Lua bindings. I'll find where the other Lua bindings are registered.

Grep (static int l_texture_load)

2345:static int l_texture_load(lua_State* L) {
2346-    const char* path = luaL_checkstring(L, 1);
2347-    Texture* tex = texture_load(path);
2348-    if (!tex) {
2349-        return luaL_error(L, "Failed to load texture: %s", path);
2350-    }
2351-    lua_pushlightuserdata(L, tex);
2352-    return 1;
2353-}
2354-
2355-static int l_texture_get_width(lua_State* L) {

Read (E:\a327ex\Anchor\engine\src\anchor.c)

2360→
  2361→static int l_texture_get_height(lua_State* L) {
  2362→    Texture* tex = (Texture*)lua_touserdata(L, 1);
  2363→    lua_pushinteger(L, tex->height);
  2364→    return 1;
  2365→}
  2366→
  2367→static int l_layer_draw_texture(lua_State* L) {
  2368→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2369→    Texture* tex = (Texture*)lua_touserdata(L, 2);
  2370→    float x = (float)luaL_checknumber(L, 3);
  2371→    float y = (float)luaL_checknumber(L, 4);
  2372→    uint32_t color = (uint32_t)luaL_optinteger(L, 5, 0xFFFFFFFF);  // Default white (no tint)
  2373→    uint32_t flash = (uint32_t)luaL_optinteger(L, 6, 0x00000000);  // Default black (no flash)
  2374→    layer_add_image(layer, tex, x, y, color, flash);
  2375→    return 0;
  2376→}
  2377→
  2378→static int l_layer_set_blend_mode(lua_State* L) {
  2379→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2380→    const char* mode = luaL_checkstring(L, 2);
  2381→    if (strcmp(mode, "alpha") == 0) {
  2382→        layer_set_blend_mode(layer, BLEND_ALPHA);
  2383→    } else if (strcmp(mode, "additive") == 0) {
  2384→        layer_set_blend_mode(layer, BLEND_ADDITIVE);
  2385→    } else {
  2386→        return luaL_error(L, "Invalid blend mode: %s (use 'alpha' or 'additive')", mode);
  2387→    }
  2388→    return 0;
  2389→}

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2357→    lua_pushinteger(L, tex->width);
  2358→    return 1;
  2359→}
  2360→
  2361→static int l_texture_get_height(lua_State* L) {
  2362→    Texture* tex = (Texture*)lua_touserdata(L, 1);
  2363→    lua_pushinteger(L, tex->height);
  2364→    return 1;
  2365→}
  2366→
  2367→// Audio Lua bindings
  2368→static int l_sound_load(lua_State* L) {
  2369→    const char* path = luaL_checkstring(L, 1);
  2370→    Sound* sound = sound_load(path);
  2371→    if (!sound) {
  2372→        return luaL_error(L, "Failed to load sound: %s", path);
  2373→    }
  2374→    lua_pushlightuserdata(L, sound);
  2375→    return 1;
  2376→}
  2377→
  2378→static int l_sound_play(lua_State* L) {
  2379→    Sound* sound = (Sound*)lua_touserdata(L, 1);
  2380→    float volume = (float)luaL_optnumber(L, 2, 1.0);
  2381→    float pitch = (float)luaL_optnumber(L, 3, 1.0);
  2382→    sound_play(sound, volume, pitch);
  2383→    return 0;
  2384→}
  2385→
... [5 more lines]

Now register the functions.

Grep (lua_register.*texture_load)

2832:    lua_register(L, "texture_load", l_texture_load);
2833-    lua_register(L, "texture_get_width", l_texture_get_width);
2834-    lua_register(L, "texture_get_height", l_texture_get_height);
2835-    lua_register(L, "rgba", l_rgba);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2828→    lua_register(L, "layer_push", l_layer_push);
  2829→    lua_register(L, "layer_pop", l_layer_pop);
  2830→    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
  2831→    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
  2832→    lua_register(L, "texture_load", l_texture_load);
  2833→    lua_register(L, "texture_get_width", l_texture_get_width);
  2834→    lua_register(L, "texture_get_height", l_texture_get_height);
  2835→    // Audio
  2836→    lua_register(L, "sound_load", l_sound_load);
  2837→    lua_register(L, "sound_play", l_sound_play);
  2838→    lua_register(L, "rgba", l_rgba);
  2839→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  2840→    lua_register(L, "timing_resync", l_timing_resync);
  2841→    // Effect shaders
  2842→    lua_register(L, "shader_load_file", l_shader_load_file);

Now let's build.

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

Exit code 1
anchor.c
src/anchor.c(204): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(209): error C2065: 'audio_initialized': undeclared identifier
src/anchor.c(211): error C2065: 'audio_engine': undeclared identifier
src/anchor.c(211): warning C4133: 'function': incompatible types - from 'int *' to 'ma_engine *'
src/anchor.c(237): error C2065: 'audio_initialized': undeclared identifier
src/anchor.c(243): error C2065: 'audio_engine': undeclared identifier
src/anchor.c(243): warning C4133: 'function': incompatible types - from 'int *' to 'ma_engine *'
src/anchor.c(251): error C2065: 'sound_master_volume': undeclared identifier
src/anchor.c(254): error C2065: 'audio_master_pitch': undeclared identifier
src/anchor.c(721): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(715): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1105): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1383): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1389): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1499): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1508): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1602): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1604): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2249): 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 audio globals are declared after the Sound functions. I need to move them earlier.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

145→
   146→// Texture
   147→typedef struct {
   148→    GLuint id;
   149→    int width;
   150→    int height;
   151→} Texture;
   152→
   153→// Load a texture from file using stb_image
   154→static Texture* texture_load(const char* path) {
   155→    int width, height, channels;
   156→    stbi_set_flip_vertically_on_load(0);  // Don't flip - we handle Y in our coordinate system
   157→    unsigned char* data = stbi_load(path, &width, &height, &channels, 4);  // Force RGBA
   158→    if (!data) {
   159→        fprintf(stderr, "Failed to load texture: %s\n", path);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   142→    // Current state
   143→    uint8_t current_blend;
   144→} Layer;
   145→
   146→// Audio globals (declared early so Sound functions can use them)
   147→static ma_engine audio_engine;
   148→static bool audio_initialized = false;
   149→static float sound_master_volume = 1.0f;
   150→static float music_master_volume = 1.0f;
   151→static float audio_master_pitch = 1.0f;
   152→
   153→// Texture
   154→typedef struct {
   155→    GLuint id;
   156→    int width;
   157→    int height;
   158→} Texture;
   159→
   160→// Load a texture from file using stb_image
   161→static Texture* texture_load(const char* path) {
   162→    int width, height, channels;

Now remove the duplicate declarations later in the file.

Grep (^static ma_engine audio_engine)

147:static ma_engine audio_engine;
661:static ma_engine audio_engine;

Read (E:\a327ex\Anchor\engine\src\anchor.c)

655→    INPUT_TYPE_GAMEPAD,
   656→} InputType;
   657→
   658→static InputType last_input_type = INPUT_TYPE_KEYBOARD;
   659→
   660→// Audio (miniaudio)
   661→static ma_engine audio_engine;
   662→static bool audio_initialized = false;
   663→static float sound_master_volume = 1.0f;
   664→static float music_master_volume = 1.0f;
   665→static float audio_master_pitch = 1.0f;
   666→
   667→static const char* input_type_to_string(InputType type) {
   668→    switch (type) {
   669→        case INPUT_TYPE_KEYBOARD: return "keyboard";

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   654→    INPUT_TYPE_MOUSE,
   655→    INPUT_TYPE_GAMEPAD,
   656→} InputType;
   657→
   658→static InputType last_input_type = INPUT_TYPE_KEYBOARD;
   659→
   660→static const char* input_type_to_string(InputType type) {
   661→    switch (type) {
   662→        case INPUT_TYPE_KEYBOARD: return "keyboard";
   663→        case INPUT_TYPE_MOUSE: return "mouse";
   664→        case INPUT_TYPE_GAMEPAD: return "gamepad";

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(211): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(721): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(715): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1105): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1383): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1389): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1499): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1508): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1602): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1604): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2249): 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

Steps 3 and 4 complete. Build successful.

Let me check what sounds are available in the assets folder.

Bash (ls -la /e/a327ex/Anchor/test/assets/)

total 2080
drwxr-xr-x 1 adn 197121       0 Jan  8 20:52 ./
drwxr-xr-x 1 adn 197121       0 Jan  8 20:05 ../
-rw-r--r-- 1 adn 197121   17183 Feb 28  2023 player_death.ogg
-rw-r--r-- 1 adn 197121 2069844 Feb 23  2024 Recettear OST - Closed Shop.ogg
-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

You have two audio files in test/assets/:

player_death.ogg — sound effect
Recettear OST - Closed Shop.ogg — music

You can test with something like:

local hit = sound_load('assets/player_death.ogg')

function init()
end

function update(dt)
    if key_is_pressed('space') then
        sound_play(hit)  -- volume=1, pitch=1
    end
    if key_is_pressed('p') then
        sound_play(hit, 1.0, 0.5)  -- half pitch (slower, lower)
    end
    if key_is_pressed('o') then
        sound_play(hit, 1.0, 1.5)  -- 1.5x pitch (faster, higher)
    end
end

Please change the main.lua file with those tests for me.

Read (E:\a327ex\Anchor\test\main.lua)

1→print("main.lua loaded - Input Test (Step 11: Rebinding Capture)")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Use input_bind_all to create default bindings for all keys/mouse buttons
     8→input_bind_all()
     9→print("input_bind_all() called - all keys now have actions")
    10→
    11→-- Set up chord: Shift+Space triggers 'super_action'
    12→input_bind_chord('super_action', {'lshift', 'space'})
    13→print("Chord 'super_action' = Shift + Space")
    14→
    15→-- Set up sequence: double-tap D triggers 'dash'
    16→-- Format: {action1, delay, action2} - press D, then D again within 0.3s
    17→input_bind_sequence('dash', {'d', 0.3, 'd'})
    18→print("Sequence 'dash' = D, D (within 0.3s)")
    19→
    20→-- Set up hold: hold Space for 1 second triggers 'charge'
    21→input_bind_hold('charge', 1.0, 'space')
    22→print("Hold 'charge' = hold Space for 1.0s")
    23→
    24→-- Set up custom action bindings (keyboard + mouse)
    25→input_bind('move_up', 'key:w')
    26→input_bind('move_up', 'key:up')
    27→input_bind('move_down', 'key:s')
    28→input_bind('move_down', 'key:down')
    29→input_bind('move_left', 'key:a')
    30→input_bind('move_left', 'key:left')
... [396 more lines]

Write (E:\a327ex\Anchor\test\main.lua)

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 - Audio Test (Steps 3-4: Sound Loading and Playback)")
     2→
     3→local screen_w, screen_h = 480, 270
     4→
     5→-- Load sound
     6→local hit = sound_load('assets/player_death.ogg')
     7→print("Sound loaded!")
     8→
     9→-- Background layer
    10→local game_layer = layer_create('game')
    11→local bg_color = rgba(48, 49, 50, 255)
    12→local white = rgba(255, 255, 255, 255)
    13→
    14→function update(dt)
    15→    -- Press Space: normal playback (volume=1, pitch=1)
    16→    if key_is_pressed('space') then
    17→        sound_play(hit)
    18→        print("Playing sound: volume=1, pitch=1")
    19→    end
    20→
    21→    -- Press P: low pitch (slower, lower)
    22→    if key_is_pressed('p') then
    23→        sound_play(hit, 1.0, 0.5)
    24→        print("Playing sound: volume=1, pitch=0.5 (lower)")
    25→    end
    26→
    27→    -- Press O: high pitch (faster, higher)
    28→    if key_is_pressed('o') then
    29→        sound_play(hit, 1.0, 1.5)
... [23 more lines]

Done. Test controls:

Space: Normal playback (volume=1, pitch=1)
P: Low pitch (0.5) — slower, lower
O: High pitch (1.5) — faster, higher
V: Quiet (volume=0.3)
R: Random pitch (0.9-1.1) — typical game variation

Revert, add the previous test that was there to old_main.lua, keep main.lua as your current test.

Write (E:\a327ex\Anchor\test\old_main.lua)

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

Bash (cat > /e/a327ex/Anchor/test/old_main.lua << 'ENDOFFILE'
print("main.lua loaded -...)

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:
old_main.lua should also preserve the old tests that were in there, in addition to the new one you're adding.

I understand - you want old_main.lua to contain the previous input test content. Let me create it.

Just create a new file named input_tests.lua with the input tests.

Bash (cat > /e/a327ex/Anchor/test/input_tests.lua << 'ENDOFFILE'
print("Input Test (St...)

Exit code 2
/usr/bin/bash: -c: line 156: unexpected EOF while looking for matching `''

`Bash (cat > /e/a327ex/Anchor/test/input_tests.lua << 'EOF' print("Input Test")

set_sh...)`

Done. Created input_tests.lua with the input tests. Your main.lua still has the audio test.

Bash (ls -la /e/a327ex/Anchor/test/*.lua)

-rw-r--r-- 1 adn 197121  5895 Jan  9 05:26 /e/a327ex/Anchor/test/input_tests.lua
-rw-r--r-- 1 adn 197121  1532 Jan  9 05:18 /e/a327ex/Anchor/test/main.lua
-rw-r--r-- 1 adn 197121 17834 Jan  8 09:34 /e/a327ex/Anchor/test/old_main.lua

Files ready:

main.lua — audio test (Space, P, O, V, R keys)
input_tests.lua — input system tests

You can run the engine and test audio now.

Tell me what the keys do in the audio test.

Space: Play sound at normal volume and pitch
P: Play at low pitch (0.5) — slower, lower tone
O: Play at high pitch (1.5) — faster, higher tone
V: Play quietly (volume 0.3, normal pitch)
R: Play with random pitch (0.9–1.1) — typical game variation

ERROR: main.lua:6: Failed to load sound: assets/player_death.ogg stack traceback: [C]: in function 'sound_load' main.lua:6: in main chunk Initialization complete. Press ESC to exit, F11 for fullscreen. Display refresh rate: 60Hz

Let me check if the file exists and verify the path.

Bash (ls -la /e/a327ex/Anchor/test/assets/*.ogg)

-rw-r--r-- 1 adn 197121   17183 Feb 28  2023 /e/a327ex/Anchor/test/assets/player_death.ogg
-rw-r--r-- 1 adn 197121 2069844 Feb 23  2024 /e/a327ex/Anchor/test/assets/Recettear OST - Closed Shop.ogg

The file exists. The issue is that miniaudio needs Vorbis decoder support for OGG files. By default it only handles WAV, FLAC, and MP3.

Let me add stb_vorbis support.

Bash (curl -L -o /e/a327ex/Anchor/engine/include/stb_vorbis.c https://raw.githubuserco...)

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0   0     0   0     0     0     0  --:--:-- --:--:-- --:--:--     0
  2 192790   2  5512   0     0 20706     0   0:00:09 --:--:--  0:00:09 20721
100 192790 100 192790   0     0 614203     0  --:--:-- --:--:-- --:--:-- 613980

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
    33→
    34→#define STB_IMAGE_IMPLEMENTATION
    35→#include <stb_image.h>
    36→
    37→#define STB_VORBIS_HEADER_ONLY
    38→#include <stb_vorbis.c>
    39→
    40→#define MINIAUDIO_IMPLEMENTATION
    41→#include <miniaudio.h>
    42→
    43→// stb_vorbis implementation (after miniaudio)
    44→#undef STB_VORBIS_HEADER_ONLY
    45→#include <stb_vorbis.c>
    46→
    47→#define WINDOW_TITLE "Anchor"
    48→#define GAME_WIDTH 480
    49→#define GAME_HEIGHT 270

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

Exit code 1
anchor.c
src/anchor.c(218): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(490): error C2059: syntax error: 'constant'
src/anchor.c(490): error C2143: syntax error: missing ')' before '|'
src/anchor.c(490): error C2143: syntax error: missing '{' before '|'
src/anchor.c(490): error C2059: syntax error: '|'
src/anchor.c(490): error C2059: syntax error: ')'
src/anchor.c(490): error C2059: syntax error: ')'
src/anchor.c(535): warning C4013: 'mat3_multiply' undefined; assuming extern returning int
src/anchor.c(608): error C2059: syntax error: 'constant'
src/anchor.c(728): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(722): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1112): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1390): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1396): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1506): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1515): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1609): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1611): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2256): 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(2274): error C2059: syntax error: 'constant'
src/anchor.c(2274): error C2143: syntax error: missing ')' before '|'
src/anchor.c(2274): error C2143: syntax error: missing '{' before '|'
src/anchor.c(2274): error C2059: syntax error: '|'
src/anchor.c(2274): error C2059: syntax error: ')'
src/anchor.c(2274): error C2059: syntax error: ')'
src/anchor.c(2284): error C2059: syntax error: 'constant'
src/anchor.c(2284): error C2143: syntax error: missing ')' before '|'
src/anchor.c(2284): error C2143: syntax error: missing '{' before '|'
... [89 more lines]

Read (E:\a327ex\Anchor\engine\src\anchor.c)

485→    *out_y = m[3] * x + m[4] * y + m[5];
   486→}
   487→
   488→// Multiply two 3x3 matrices: C = A * B (row-major order)
   489→// For 2D affine transforms, bottom row is always [0, 0, 1]
   490→static void mat3_multiply(const float* A, const float* B, float* C) {
   491→    // Row 0
   492→    C[0] = A[0]*B[0] + A[1]*B[3];  // + A[2]*0
   493→    C[1] = A[0]*B[1] + A[1]*B[4];  // + A[2]*0
   494→    C[2] = A[0]*B[2] + A[1]*B[5] + A[2];  // *1
   495→    // Row 1
   496→    C[3] = A[3]*B[0] + A[4]*B[3];
   497→    C[4] = A[3]*B[1] + A[4]*B[4];
   498→    C[5] = A[3]*B[2] + A[4]*B[5] + A[5];
   499→    // Row 2 - always [0, 0, 1]

stb_vorbis is defining macros (C, A, B) that conflict with our variable names. Let me try a simpler approach - convert the OGG to WAV for testing.

Bash (which ffmpeg)

Exit code 1
which: no ffmpeg in (/c/emsdk:/c/emsdk/upstream/emscripten:/c/Users/adn/bin:/mingw64/bin:/usr/local/bin:/usr/bin:/bin:/mingw64/bin:/usr/bin:/c/Users/adn/bin:/c/WINDOWS/system32:/c/WINDOWS:/c/WINDOWS/System32/Wbem:/c/WINDOWS/System32/WindowsPowerShell/v1.0:/c/WINDOWS/System32/OpenSSH:/cmd:/c/Program Files/dotnet:/c/Program Files/nodejs:/c/ProgramData/chocolatey/bin:/c/Program Files/Neovim/bin:/c/Program Files/Neovide:/c/Program Files (x86)/Windows Kits/10/Windows Performance Toolkit:/c/Program Files/CMake/bin:/c/Users/adn/AppData/Local/Programs/Python/Python314/Scripts:/c/Users/adn/AppData/Local/Programs/Python/Python314:/c/Users/adn/AppData/Local/Microsoft/WindowsApps:/c/Users/adn/AppData/Roaming/npm:/c/Users/adn/AppData/Local/Voidstar/FilePilot:/usr/bin/vendor_perl:/usr/bin/core_perl)

I forgot to add MA_ENABLE_VORBIS. Let me fix that.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
    33→
    34→#define STB_IMAGE_IMPLEMENTATION
    35→#include <stb_image.h>
    36→
    37→#define STB_VORBIS_HEADER_ONLY
    38→#include <stb_vorbis.c>
    39→
    40→#define MA_ENABLE_VORBIS
    41→#define MINIAUDIO_IMPLEMENTATION
    42→#include <miniaudio.h>
    43→
    44→// stb_vorbis implementation (after miniaudio)
    45→#undef STB_VORBIS_HEADER_ONLY
    46→#include <stb_vorbis.c>
    47→
    48→#define WINDOW_TITLE "Anchor"
    49→#define GAME_WIDTH 480
    50→#define GAME_HEIGHT 270

Do not convert to wav, try to make .ogg loading work, as that's what I'll use in the end.

The issue is stb_vorbis defines macros (C, A, B) that conflict with our variable names. I need to move the stb_vorbis implementation to the very end of the file, after all our code.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
    40→#define MA_ENABLE_VORBIS
    41→#define MINIAUDIO_IMPLEMENTATION
    42→#include <miniaudio.h>
    43→
    44→#define WINDOW_TITLE "Anchor"
    45→#define GAME_WIDTH 480
    46→#define GAME_HEIGHT 270
    47→#define INITIAL_SCALE 3
    48→

Now let me find the end of the file and add the implementation there.

Bash (tail -20 /e/a327ex/Anchor/engine/src/anchor.c)

            snap_frequencies[snap_frequency_count++] = base_frametime * i;
        }
    }

    #ifdef __EMSCRIPTEN__
    // Use browser's requestAnimationFrame
    // 0 = use RAF, 1 = simulate infinite loop (blocking)
    emscripten_set_main_loop(main_loop_iteration, 0, 1);
    #else
    // Desktop: traditional blocking loop
    while (running) {
        main_loop_iteration();
    }

    printf("Shutting down...\n");
    engine_shutdown();
    #endif

    return 0;
}

Grep (^}$)

195:}
201:}
233:}
237:}
243:}
271:}
324:}
335:}
362:}
367:}
372:}
377:}
385:}
407:}
412:}
424:}
435:}
450:}
455:}
483:}
500:}
534:}
543:}
551:}
577:}
601:}
671:}
680:}
687:}
692:}
... [143 more lines]

Read (E:\a327ex\Anchor\engine\src\anchor.c)

3800→
  3801→    printf("Shutting down...\n");
  3802→    engine_shutdown();
  3803→    #endif
  3804→
  3805→    return 0;
  3806→}
  3807→

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3797→    while (running) {
  3798→        main_loop_iteration();
  3799→    }
  3800→
  3801→    printf("Shutting down...\n");
  3802→    engine_shutdown();
  3803→    #endif
  3804→
  3805→    return 0;
  3806→}
  3807→
  3808→// stb_vorbis implementation - must be at end to avoid macro conflicts with our code
  3809→#undef STB_VORBIS_HEADER_ONLY
  3810→#include <stb_vorbis.c>
  3811→

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

Exit code 1
anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(725): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(719): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1109): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1387): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1393): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1503): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1512): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1606): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1608): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2253): 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 : fatal error LNK1104: cannot open file 'build\anchor.exe'
Build failed!

The code compiled! But the linker can't overwrite anchor.exe because it's still running. Close the engine and rebuild.

Bash (taskkill //F //IM anchor.exe 2>/dev/null; sleep 1; cd /e/a327ex/Anchor/engine &&...)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(725): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(719): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1109): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1387): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1393): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1503): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1512): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1606): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1608): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2253): 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

Build successful with OGG support. You can now test. The stb_vorbis implementation is placed at the end of the file to avoid macro conflicts.

What does each key do again?

Space: Normal playback (volume=1, pitch=1)
P: Low pitch (0.5) — slower, deeper
O: High pitch (1.5) — faster, higher
V: Quiet (volume=0.3)
R: Random pitch (0.9–1.1) — typical game variation

Change filter to rough, please.

Read (E:\a327ex\Anchor\test\main.lua)

1→print("main.lua loaded - Audio Test (Steps 3-4: Sound Loading and Playback)")
     2→
     3→local screen_w, screen_h = 480, 270
     4→
     5→-- Load sound
     6→local hit = sound_load('assets/player_death.ogg')
     7→print("Sound loaded!")
     8→
     9→-- Background layer
    10→local game_layer = layer_create('game')
    11→local bg_color = rgba(48, 49, 50, 255)
    12→local white = rgba(255, 255, 255, 255)
    13→
    14→function update(dt)
    15→    -- Press Space: normal playback (volume=1, pitch=1)
    16→    if key_is_pressed('space') then
    17→        sound_play(hit)
    18→        print("Playing sound: volume=1, pitch=1")
    19→    end
    20→
    21→    -- Press P: low pitch (slower, lower)
    22→    if key_is_pressed('p') then
    23→        sound_play(hit, 1.0, 0.5)
    24→        print("Playing sound: volume=1, pitch=0.5 (lower)")
    25→    end
    26→
    27→    -- Press O: high pitch (faster, higher)
    28→    if key_is_pressed('o') then
    29→        sound_play(hit, 1.0, 1.5)
    30→        print("Playing sound: volume=1, pitch=1.5 (higher)")
... [22 more lines]

Edit (E:\a327ex\Anchor\test\main.lua)

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 - Audio Test (Steps 3-4: Sound Loading and Playback)")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Load sound
     8→local hit = sound_load('assets/player_death.ogg')
     9→print("Sound loaded!")

Done.

Pressing V works, pressing any of the other keys outputs to console but then when I try to close the program it doesn't close and hangs. Make the ball move so I can see if the program is still updating correctly after I press one of the other keys.

Edit (E:\a327ex\Anchor\test\main.lua)

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:
     7→-- Load sound
     8→local hit = sound_load('assets/player_death.ogg')
     9→print("Sound loaded!")
    10→
    11→-- Background layer
    12→local game_layer = layer_create('game')
    13→local bg_color = rgba(48, 49, 50, 255)
    14→local white = rgba(255, 255, 255, 255)
    15→
    16→-- Moving ball
    17→local ball_x = screen_w / 2
    18→local ball_y = screen_h / 2
    19→local ball_vx = 100
    20→local ball_vy = 80
    21→
    22→function update(dt)
    23→    -- Update ball position
    24→    ball_x = ball_x + ball_vx * dt
    25→    ball_y = ball_y + ball_vy * dt
    26→
    27→    -- Bounce off walls
    28→    if ball_x < 30 or ball_x > screen_w - 30 then ball_vx = -ball_vx end
    29→    if ball_y < 30 or ball_y > screen_h - 30 then ball_vy = -ball_vy end
    30→    -- Press Space: normal playback (volume=1, pitch=1)
    31→    if key_is_pressed('space') then
    32→        sound_play(hit)
    33→        print("Playing sound: volume=1, pitch=1")

Edit (E:\a327ex\Anchor\test\main.lua)

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:
    57→        sound_play(hit, 1.0, pitch)
    58→        print(string.format("Playing sound: volume=1, pitch=%.2f (random)", pitch))
    59→    end
    60→
    61→    -- Draw simple UI
    62→    layer_rectangle(game_layer, 0, 0, screen_w, screen_h, bg_color)
    63→    layer_circle(game_layer, ball_x, ball_y, 30, white)
    64→
    65→    -- Auto-composite (no manual layer_draw calls)
    66→end
    67→

Done. The ball now bounces around. This will show if the program freezes or keeps running after you press the sound keys.

It seems like pressing any of the keys works and outputs the sound pitched as you would expect, but quickly further presses stop working (sound doesn't come, outputs to console) and sometimes it makes the program hard to close because it hangs. It still updates normally.

The issue is likely that we're calling ma_sound_uninit from the audio thread's callback, which can cause problems. Let me fix this by deferring cleanup to the main thread.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

225→            free(sound);
   226→            return NULL;
   227→        }
   228→        ma_sound_uninit(&test_sound);
   229→    }
   230→
   231→    printf("Loaded sound: %s\n", path);
   232→    return sound;
   233→}
   234→
   235→static void sound_destroy(Sound* sound) {
   236→    if (sound) free(sound);
   237→}
   238→
   239→// Callback when a playing sound instance finishes - cleans up the ma_sound
   240→static void sound_end_callback(void* pUserData, ma_sound* pSound) {
   241→    ma_sound_uninit(pSound);
   242→    free(pSound);
   243→}
   244→
   245→// Play a sound with volume and pitch
   246→// Creates a new ma_sound instance that auto-destructs when done
   247→static void sound_play(Sound* sound, float volume, float pitch) {
   248→    if (!audio_initialized || !sound) return;
   249→
   250→    ma_sound* playing = (ma_sound*)malloc(sizeof(ma_sound));
   251→    if (!playing) return;
   252→
   253→    // MA_SOUND_FLAG_DECODE uses cached decoded audio from resource manager
   254→    ma_result result = ma_sound_init_from_file(&audio_engine, sound->path, MA_SOUND_FLAG_DECODE, NULL, NULL, playing);
... [30 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   231→    printf("Loaded sound: %s\n", path);
   232→    return sound;
   233→}
   234→
   235→static void sound_destroy(Sound* sound) {
   236→    if (sound) free(sound);
   237→}
   238→
   239→// Sound instance pool for fire-and-forget playback
   240→// Cleaned up from main thread to avoid threading issues
   241→#define MAX_PLAYING_SOUNDS 64
   242→
   243→typedef struct {
   244→    ma_sound sound;
   245→    bool in_use;
   246→} PlayingSound;
   247→
   248→static PlayingSound playing_sounds[MAX_PLAYING_SOUNDS];
   249→static bool playing_sounds_initialized = false;
   250→
   251→// Clean up finished sounds (call from main thread each frame)
   252→static void sound_cleanup_finished(void) {
   253→    if (!audio_initialized) return;
   254→
   255→    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
   256→        if (playing_sounds[i].in_use) {
   257→            if (!ma_sound_is_playing(&playing_sounds[i].sound)) {
   258→                ma_sound_uninit(&playing_sounds[i].sound);
   259→                playing_sounds[i].in_use = false;
... [65 more lines]

Now I need to call sound_cleanup_finished() each frame and sound_cleanup_all() on shutdown.

Grep (static void main_loop_iteration)

3289:static void main_loop_iteration(void) {
3290-    Uint64 current_time = SDL_GetPerformanceCounter();
3291-    double dt = (double)(current_time - last_time) / (double)perf_freq;
3292-    last_time = current_time;
3293-
3294-    // Clamp delta time to handle anomalies (pauses, debugger, sleep resume)
3295-    if (dt > PHYSICS_RATE * MAX_UPDATES) {
3296-        dt = PHYSICS_RATE;
3297-    }
3298-    if (dt < 0) {
3299-        dt = 0;

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3285→    SDL_Quit();
  3286→}
  3287→
  3288→// One frame of the main loop
  3289→static void main_loop_iteration(void) {
  3290→    Uint64 current_time = SDL_GetPerformanceCounter();
  3291→    double dt = (double)(current_time - last_time) / (double)perf_freq;
  3292→    last_time = current_time;
  3293→
  3294→    // Clean up finished sounds (must be done from main thread)
  3295→    sound_cleanup_finished();
  3296→
  3297→    // Clamp delta time to handle anomalies (pauses, debugger, sleep resume)
  3298→    if (dt > PHYSICS_RATE * MAX_UPDATES) {
  3299→        dt = PHYSICS_RATE;
  3300→    }
  3301→    if (dt < 0) {
  3302→        dt = 0;
  3303→    }
  3304→
  3305→    // VSync snapping: if dt is close to a known refresh rate, snap to it exactly
  3306→    // This prevents accumulator drift from timer jitter

Now add cleanup on shutdown.

Grep (if (audio_initialized) {)

220:    if (audio_initialized) {
221-        ma_sound test_sound;
222-        ma_result result = ma_sound_init_from_file(&audio_engine, path, MA_SOUND_FLAG_DECODE, NULL, NULL, &test_sound);
223-        if (result != MA_SUCCESS) {
224-            fprintf(stderr, "Failed to load sound: %s (error %d)\n", path, result);
--
3277:    if (audio_initialized) {
3278-        ma_engine_uninit(&audio_engine);
3279-        audio_initialized = false;
3280-    }
3281-    // Other resources

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3273→    if (screen_vbo) { glDeleteBuffers(1, &screen_vbo); screen_vbo = 0; }
  3274→    if (screen_vao) { glDeleteVertexArrays(1, &screen_vao); screen_vao = 0; }
  3275→    if (screen_shader) { glDeleteProgram(screen_shader); screen_shader = 0; }
  3276→    // Audio
  3277→    if (audio_initialized) {
  3278→        sound_cleanup_all();
  3279→        ma_engine_uninit(&audio_engine);
  3280→        audio_initialized = false;
  3281→    }
  3282→    // Other resources
  3283→    if (L) { lua_close(L); L = NULL; }
  3284→    if (gl_context) { SDL_GL_DeleteContext(gl_context); gl_context = NULL; }
  3285→    if (window) { SDL_DestroyWindow(window); window = NULL; }
  3286→    SDL_Quit();

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(774): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(768): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1158): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1436): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1442): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1552): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1561): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1655): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1657): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2302): 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

Build successful.

Changes:

Sound instances now use a pool (64 slots max)
Cleanup happens from main thread each frame (not audio thread callback)
Proper cleanup on shutdown

Test it now — should fix the hanging and sounds stopping.

Great, it seems to work. Next step!

Step 5: Sound master volume.

I need to add sound_set_volume(volume) — a master volume for all sound effects.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

2425→        return luaL_error(L, "Failed to load sound: %s", path);
  2426→    }
  2427→    lua_pushlightuserdata(L, sound);
  2428→    return 1;
  2429→}
  2430→
  2431→static int l_sound_play(lua_State* L) {
  2432→    Sound* sound = (Sound*)lua_touserdata(L, 1);
  2433→    float volume = (float)luaL_optnumber(L, 2, 1.0);
  2434→    float pitch = (float)luaL_optnumber(L, 3, 1.0);
  2435→    sound_play(sound, volume, pitch);
  2436→    return 0;
  2437→}
  2438→
  2439→static int l_layer_draw_texture(lua_State* L) {
  2440→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2441→    Texture* tex = (Texture*)lua_touserdata(L, 2);
  2442→    float x = (float)luaL_checknumber(L, 3);
  2443→    float y = (float)luaL_checknumber(L, 4);
  2444→    uint32_t color = (uint32_t)luaL_optinteger(L, 5, 0xFFFFFFFF);  // Default white (no tint)
  2445→    uint32_t flash = (uint32_t)luaL_optinteger(L, 6, 0x00000000);  // Default black (no flash)
  2446→    layer_add_image(layer, tex, x, y, color, flash);
  2447→    return 0;
  2448→}
  2449→
  2450→static int l_layer_set_blend_mode(lua_State* L) {
  2451→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2452→    const char* mode = luaL_checkstring(L, 2);
  2453→    if (strcmp(mode, "alpha") == 0) {
  2454→        layer_set_blend_mode(layer, BLEND_ALPHA);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2427→    lua_pushlightuserdata(L, sound);
  2428→    return 1;
  2429→}
  2430→
  2431→static int l_sound_play(lua_State* L) {
  2432→    Sound* sound = (Sound*)lua_touserdata(L, 1);
  2433→    float volume = (float)luaL_optnumber(L, 2, 1.0);
  2434→    float pitch = (float)luaL_optnumber(L, 3, 1.0);
  2435→    sound_play(sound, volume, pitch);
  2436→    return 0;
  2437→}
  2438→
  2439→static int l_sound_set_volume(lua_State* L) {
  2440→    sound_master_volume = (float)luaL_checknumber(L, 1);
  2441→    return 0;
  2442→}
  2443→
  2444→static int l_layer_draw_texture(lua_State* L) {
  2445→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2446→    Texture* tex = (Texture*)lua_touserdata(L, 2);
  2447→    float x = (float)luaL_checknumber(L, 3);
  2448→    float y = (float)luaL_checknumber(L, 4);

Before that, update implementation plan by checking off boxes so far, and also adding any additional work you did (like adding Vorbis)

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

860→- Master pitch: slow-mo effect, multiplies with per-play pitch
   861→- Final pitch = `per_play_pitch × master_pitch`
   862→- Real-time adjustment — master pitch change affects currently playing sounds
   863→
   864→---
   865→
   866→### Implementation Steps
   867→
   868→**Step 1: Integrate miniaudio**
   869→- [ ] Download miniaudio.h to `engine/include/`
   870→- [ ] `#define MINIAUDIO_IMPLEMENTATION` in anchor.c
   871→- [ ] Verify it compiles on Windows
   872→
   873→**Step 2: Audio device initialization**
   874→- [ ] Initialize `ma_engine` (high-level API, handles mixing)
   875→- [ ] Shutdown on exit
   876→- [ ] Verify no errors on startup
   877→
   878→**Step 3: Sound loading**
   879→- [ ] `sound_load(path)` — returns Sound userdata
   880→- [ ] Load WAV and OGG (miniaudio has built-in decoders)
   881→- [ ] Store `ma_sound` in Sound struct
   882→- [ ] Lua binding
   883→
   884→**Step 4: Sound playback**
   885→- [ ] `sound_play(sound)` — play at volume=1, pitch=1
   886→- [ ] `sound_play(sound, volume, pitch)` — play with per-play volume and pitch
   887→- [ ] Per-play pitch for variation (e.g., random 0.95-1.05)
   888→- [ ] Multiple simultaneous plays of same sound (need sound instances/cloning)
   889→- [ ] Lua binding
... [50 more lines]

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   862→- Real-time adjustment — master pitch change affects currently playing sounds
   863→
   864→---
   865→
   866→### Implementation Steps
   867→
   868→**Step 1: Integrate miniaudio**
   869→- [x] Download miniaudio.h to `engine/include/`
   870→- [x] `#define MINIAUDIO_IMPLEMENTATION` in anchor.c
   871→- [x] Add stb_vorbis.c for OGG/Vorbis decoding (header at top, implementation at end of file to avoid macro conflicts)
   872→- [x] Rename `Chord` → `InputChord` and `shutdown` → `engine_shutdown` to avoid Windows header conflicts
   873→- [x] Verify it compiles on Windows
   874→
   875→**Step 2: Audio device initialization**
   876→- [x] Initialize `ma_engine` (high-level API, handles mixing)
   877→- [x] Shutdown on exit
   878→- [x] Verify no errors on startup
   879→
   880→**Step 3: Sound loading**
   881→- [x] `sound_load(path)` — returns Sound userdata
   882→- [x] Load WAV and OGG (via stb_vorbis)
   883→- [x] Sound struct stores path; audio data cached by miniaudio's resource manager
   884→- [x] Lua binding
   885→
   886→**Step 4: Sound playback**
   887→- [x] `sound_play(sound)` — play at volume=1, pitch=1
   888→- [x] `sound_play(sound, volume, pitch)` — play with per-play volume and pitch
   889→- [x] Per-play pitch for variation (e.g., random 0.95-1.05)
   890→- [x] Sound instance pool (64 slots) with main-thread cleanup to avoid audio thread issues
... [10 more lines]

Done. Now continuing with Step 5 — I already added l_sound_set_volume, just need to register it.

Grep (lua_register.*sound_play)

2895:    lua_register(L, "sound_play", l_sound_play);
2896-    lua_register(L, "rgba", l_rgba);
2897-    lua_register(L, "set_shape_filter", l_set_shape_filter);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2891→    lua_register(L, "texture_get_width", l_texture_get_width);
  2892→    lua_register(L, "texture_get_height", l_texture_get_height);
  2893→    // Audio
  2894→    lua_register(L, "sound_load", l_sound_load);
  2895→    lua_register(L, "sound_play", l_sound_play);
  2896→    lua_register(L, "sound_set_volume", l_sound_set_volume);
  2897→    lua_register(L, "rgba", l_rgba);
  2898→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  2899→    lua_register(L, "timing_resync", l_timing_resync);
  2900→    // Effect shaders
  2901→    lua_register(L, "shader_load_file", l_shader_load_file);

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(774): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(768): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1158): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1436): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1442): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1552): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1561): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1655): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1657): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2302): 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

Step 5 complete. Now Steps 6-8: Music loading, playback, and volume.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

318→    playing_sounds[slot].in_use = true;
   319→    ma_sound_start(&playing_sounds[slot].sound);
   320→}
   321→
   322→// Create a layer with FBO at specified resolution
   323→static Layer* layer_create(int width, int height) {
   324→    Layer* layer = (Layer*)calloc(1, sizeof(Layer));
   325→    if (!layer) return NULL;
   326→
   327→    layer->width = width;

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   314→
   315→    // Apply pitch: per-play pitch * master pitch
   316→    ma_sound_set_pitch(&playing_sounds[slot].sound, pitch * audio_master_pitch);
   317→
   318→    playing_sounds[slot].in_use = true;
   319→    ma_sound_start(&playing_sounds[slot].sound);
   320→}
   321→
   322→// Music - single streaming track
   323→typedef struct {
   324→    ma_sound sound;
   325→    bool initialized;
   326→} Music;
   327→
   328→static Music* current_music = NULL;
   329→
   330→static Music* music_load(const char* path) {
   331→    if (!audio_initialized) return NULL;
   332→
   333→    Music* music = (Music*)malloc(sizeof(Music));
   334→    if (!music) return NULL;
   335→
   336→    // MA_SOUND_FLAG_STREAM for streaming (not fully loaded into memory)
   337→    ma_result result = ma_sound_init_from_file(&audio_engine, path, MA_SOUND_FLAG_STREAM, NULL, NULL, &music->sound);
   338→    if (result != MA_SUCCESS) {
   339→        fprintf(stderr, "Failed to load music: %s (error %d)\n", path, result);
   340→        free(music);
   341→        return NULL;
   342→    }
... [48 more lines]

Now add Lua bindings for music.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2499→    sound_play(sound, volume, pitch);
  2500→    return 0;
  2501→}
  2502→
  2503→static int l_sound_set_volume(lua_State* L) {
  2504→    sound_master_volume = (float)luaL_checknumber(L, 1);
  2505→    return 0;
  2506→}
  2507→
  2508→static int l_music_load(lua_State* L) {
  2509→    const char* path = luaL_checkstring(L, 1);
  2510→    Music* music = music_load(path);
  2511→    if (!music) {
  2512→        return luaL_error(L, "Failed to load music: %s", path);
  2513→    }
  2514→    lua_pushlightuserdata(L, music);
  2515→    return 1;
  2516→}
  2517→
  2518→static int l_music_play(lua_State* L) {
  2519→    Music* music = (Music*)lua_touserdata(L, 1);
  2520→    bool loop = lua_toboolean(L, 2);
  2521→    music_play(music, loop);
  2522→    return 0;
  2523→}
  2524→
  2525→static int l_music_stop(lua_State* L) {
  2526→    (void)L;
  2527→    music_stop();
... [14 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2984→    lua_register(L, "texture_get_width", l_texture_get_width);
  2985→    lua_register(L, "texture_get_height", l_texture_get_height);
  2986→    // Audio
  2987→    lua_register(L, "sound_load", l_sound_load);
  2988→    lua_register(L, "sound_play", l_sound_play);
  2989→    lua_register(L, "sound_set_volume", l_sound_set_volume);
  2990→    lua_register(L, "music_load", l_music_load);
  2991→    lua_register(L, "music_play", l_music_play);
  2992→    lua_register(L, "music_stop", l_music_stop);
  2993→    lua_register(L, "music_set_volume", l_music_set_volume);
  2994→    lua_register(L, "rgba", l_rgba);
  2995→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  2996→    lua_register(L, "timing_resync", l_timing_resync);
  2997→    // Effect shaders
  2998→    lua_register(L, "shader_load_file", l_shader_load_file);

Now Step 9: Master pitch. This needs to update all currently playing sounds in real-time.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   374→        ma_sound_stop(&current_music->sound);
   375→    }
   376→}
   377→
   378→static void music_set_volume(float volume) {
   379→    music_master_volume = volume;
   380→    // Apply to currently playing music
   381→    if (current_music && current_music->initialized) {
   382→        ma_sound_set_volume(&current_music->sound, volume);
   383→    }
   384→}
   385→
   386→// Master pitch (slow-mo) - affects all currently playing audio
   387→static void audio_set_master_pitch(float pitch) {
   388→    audio_master_pitch = pitch;
   389→
   390→    // Update all playing sounds
   391→    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
   392→        if (playing_sounds[i].in_use) {
   393→            ma_sound_set_pitch(&playing_sounds[i].sound, pitch);
   394→        }
   395→    }
   396→
   397→    // Update music
   398→    if (current_music && current_music->initialized) {
   399→        ma_sound_set_pitch(&current_music->sound, pitch);
   400→    }
   401→}
   402→
... [5 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  2544→    music_stop();
  2545→    return 0;
  2546→}
  2547→
  2548→static int l_music_set_volume(lua_State* L) {
  2549→    float volume = (float)luaL_checknumber(L, 1);
  2550→    music_set_volume(volume);
  2551→    return 0;
  2552→}
  2553→
  2554→static int l_audio_set_master_pitch(lua_State* L) {
  2555→    float pitch = (float)luaL_checknumber(L, 1);
  2556→    audio_set_master_pitch(pitch);
  2557→    return 0;
  2558→}
  2559→
  2560→static int l_layer_draw_texture(lua_State* L) {
  2561→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  2562→    Texture* tex = (Texture*)lua_touserdata(L, 2);
  2563→    float x = (float)luaL_checknumber(L, 3);
  2564→    float y = (float)luaL_checknumber(L, 4);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3009→    // Audio
  3010→    lua_register(L, "sound_load", l_sound_load);
  3011→    lua_register(L, "sound_play", l_sound_play);
  3012→    lua_register(L, "sound_set_volume", l_sound_set_volume);
  3013→    lua_register(L, "music_load", l_music_load);
  3014→    lua_register(L, "music_play", l_music_play);
  3015→    lua_register(L, "music_stop", l_music_stop);
  3016→    lua_register(L, "music_set_volume", l_music_set_volume);
  3017→    lua_register(L, "audio_set_master_pitch", l_audio_set_master_pitch);
  3018→    lua_register(L, "rgba", l_rgba);
  3019→    lua_register(L, "set_shape_filter", l_set_shape_filter);
  3020→    lua_register(L, "timing_resync", l_timing_resync);
  3021→    // Effect shaders
  3022→    lua_register(L, "shader_load_file", l_shader_load_file);

Bash (cd /e/a327ex/Anchor/engine && ./build.bat 2>&1)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(855): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(849): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1239): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1517): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1523): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1633): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1642): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1736): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1738): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2383): 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

Build successful. Steps 5-9 implemented. Let me update the test file.

Read (E:\a327ex\Anchor\test\main.lua)

1→print("main.lua loaded - Audio Test (Steps 3-4: Sound Loading and Playback)")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Load sound
     8→local hit = sound_load('assets/player_death.ogg')
     9→print("Sound loaded!")
    10→
    11→-- Background layer
    12→local game_layer = layer_create('game')
    13→local bg_color = rgba(48, 49, 50, 255)
    14→local white = rgba(255, 255, 255, 255)
    15→
    16→-- Moving ball
    17→local ball_x = screen_w / 2
    18→local ball_y = screen_h / 2
    19→local ball_vx = 100
    20→local ball_vy = 80
    21→
    22→function update(dt)
    23→    -- Update ball position
    24→    ball_x = ball_x + ball_vx * dt
    25→    ball_y = ball_y + ball_vy * dt
    26→
    27→    -- Bounce off walls
    28→    if ball_x < 30 or ball_x > screen_w - 30 then ball_vx = -ball_vx end
    29→    if ball_y < 30 or ball_y > screen_h - 30 then ball_vy = -ball_vy end
    30→    -- Press Space: normal playback (volume=1, pitch=1)
... [37 more lines]

Edit (E:\a327ex\Anchor\test\main.lua)

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 - Audio Test (Phase 6)")
     2→
     3→set_shape_filter("rough")
     4→
     5→local screen_w, screen_h = 480, 270
     6→
     7→-- Load sound and music
     8→local hit = sound_load('assets/player_death.ogg')
     9→local bgm = music_load('assets/Recettear OST - Closed Shop.ogg')
    10→print("Sound and music loaded!")
    11→
    12→-- Background layer
    13→local game_layer = layer_create('game')
    14→local bg_color = rgba(48, 49, 50, 255)
    15→local white = rgba(255, 255, 255, 255)
    16→
    17→-- Moving ball
    18→local ball_x = screen_w / 2
    19→local ball_y = screen_h / 2
    20→local ball_vx = 100
    21→local ball_vy = 80
    22→
    23→-- Master pitch state
    24→local master_pitch = 1.0
    25→
    26→function update(dt)
    27→    -- Update ball position
    28→    ball_x = ball_x + ball_vx * dt
    29→    ball_y = ball_y + ball_vy * dt
... [74 more lines]

Steps 5-9 complete. Test controls:

Sound effects:

Space: Play sound (normal)
R: Play sound (random pitch 0.9–1.1)

Music:

M: Play music (loop)
N: Stop music

Master pitch (slow-mo):

Down: Decrease pitch (min 0.25)
Up: Increase pitch (max 2.0)

Volume:

1: Sound volume 50%
2: Sound volume 100%
3: Music volume 50%
4: Music volume 100%

1, 2, 3, 4 don't seem to do anything. Music playing works, though. Also, you're about to auto-compact.

Let me check how number keys are named in the input system.

Grep (SDL_SCANCODE_1)

982-    // Numbers
983:    if (sc >= SDL_SCANCODE_1 && sc <= SDL_SCANCODE_9) {
984-        static char digit[2] = {0};
985:        digit[0] = '1' + (sc - SDL_SCANCODE_1);
986-        return digit;

This session is being continued from a previous conversation that ran out of context. The conversation is summarized below: Analysis: Let me analyze the conversation chronologically:

Initial Request: User wants to start Phase 6 (Audio) of the Anchor engine implementation.

Library Discussion: User asked about pitch shifting differences between miniaudio and SoLoud. I explained both use resampling. User clarified they need real-time pitch adjustment for slow-mo effects (sounds already playing need to change pitch). I confirmed both libraries support this.

API Design: We designed a simple audio API:

sound_load, sound_play(sound, volume, pitch)

music_load, music_play(music, loop), music_stop()

sound_set_volume, music_set_volume (separate master volumes)

audio_set_master_pitch (for slow-mo, affects everything)

Per-play pitch variation supported

Final pitch = per_play_pitch × master_pitch

Implementation Plan Update: Updated ANCHOR_IMPLEMENTATION_PLAN.md with concrete steps.

Step 1 - Integrate miniaudio:

Downloaded miniaudio.h

Had naming conflicts with Windows headers: Chord and shutdown

Fixed by renaming to InputChord and engine_shutdown

Step 2 - Audio device initialization:

Added ma_engine audio_engine global

Init in main(), uninit in engine_shutdown()

Steps 3-4 - Sound loading and playback:

Created Sound struct (stores path, miniaudio caches decoded audio)

Initial implementation used end callback for cleanup - CAUSED ISSUES

User reported: sounds work but stop working after a few presses, program hangs on close

Fixed by implementing a sound pool (64 slots) with main-thread cleanup

OGG/Vorbis Support:

Initial load failed - needed stb_vorbis for OGG decoding

Downloaded stb_vorbis.c

First attempt caused macro conflicts (C, A, B macros conflicting with variable names)

Fixed by putting stb_vorbis implementation at END of anchor.c file

Steps 5-9: Implemented sound_set_volume, music_load/play/stop, music_set_volume, audio_set_master_pitch

Current Issue: User reports 1, 2, 3, 4 keys don't work for volume controls. I was checking the key naming when user mentioned auto-compact coming.

Key files modified: - engine/src/anchor.c - main engine code - engine/include/miniaudio.h - downloaded - engine/include/stb_vorbis.c - downloaded - test/main.lua - test file - test/input_tests.lua - previous input tests preserved - docs/ANCHOR_IMPLEMENTATION_PLAN.md - updated with progress

Summary: 1. Primary Request and Intent: User wants to implement Phase 6 (Audio) of the Anchor game engine. Requirements: - Sound effects with per-play volume and pitch (for variation like 0.95-1.05) - Music playback with loop support - Separate master volumes for sounds and music (for options menu sliders) - Global master pitch for slow-mo effects (must affect currently playing sounds in real-time) - OGG/Vorbis support (user explicitly said "Do not convert to wav, try to make .ogg loading work")

Key Technical Concepts:

miniaudio single-header audio library

stb_vorbis for OGG decoding

Sound instance pooling (avoid audio thread cleanup issues)

Main-thread cleanup pattern for audio resources

Per-play pitch × master pitch for final pitch calculation

Streaming vs decoded audio (music streams, sounds decode fully)

Files and Code Sections:

engine/include/miniaudio.h - Downloaded miniaudio library

engine/include/stb_vorbis.c - Downloaded for OGG support

engine/src/anchor.c - Main engine file with audio implementation: ```c // Audio globals (at top, before Sound/Music code) static ma_engine audio_engine; static bool audio_initialized = false; static float sound_master_volume = 1.0f; static float music_master_volume = 1.0f; static float audio_master_pitch = 1.0f;

// Sound instance pool

define MAX_PLAYING_SOUNDS 64

typedef struct { ma_sound sound; bool in_use; } PlayingSound; static PlayingSound playing_sounds[MAX_PLAYING_SOUNDS];

// stb_vorbis at END of file to avoid macro conflicts

undef STB_VORBIS_HEADER_ONLY

include <stb_vorbis.c>

```

test/main.lua - Current test file: lua local hit = sound_load('assets/player_death.ogg') local bgm = music_load('assets/Recettear OST - Closed Shop.ogg') -- Space: sound, R: random pitch, M: music play, N: music stop -- Up/Down: master pitch, 1-4: volume controls (currently broken)

test/input_tests.lua - Previous input tests preserved separately

docs/ANCHOR_IMPLEMENTATION_PLAN.md - Updated with checkboxes for completed steps

Errors and fixes:

Windows header conflicts: Chord conflicted with wingdi.h, shutdown with winsock.h

Fixed: Renamed to InputChord and engine_shutdown

OGG loading failed: miniaudio needs stb_vorbis for Vorbis decoding

Fixed: Added stb_vorbis.c with MA_ENABLE_VORBIS define

stb_vorbis macro conflicts: Macros A, B, C conflicted with variable names

Fixed: Put #undef STB_VORBIS_HEADER_ONLY and include at END of anchor.c

Sound playback hangs/stops working: End callback cleanup from audio thread caused issues

Fixed: Sound pool with main-thread cleanup via sound_cleanup_finished() called each frame

Current issue: Number keys 1-4 not working for volume controls

Was investigating when summary requested

Problem Solving:

Sound pooling pattern established (64 slots, main-thread cleanup)

stb_vorbis include order solved (header at top, implementation at bottom)

Volume controls for 1-4 keys not working - needs investigation

All user messages:

"Hi, Claude. Let's get started on phase 6."

"We're going to keep the audio system extremely simple for now. What's the difference between pitch shifting in both options?"

"I usually use pitch shifting on hit effects, death, etc, where the entire game slows down for a while, and thus sounds have to also do to give that wooooooooo downwards effect. Is the pitch shifting we're using going to do that?"

"OK, what would the API look like for you? Let's assume we're using miniaudio."

"I would like to be able to set volume for sound effects and music separately. So the user can have a slider in the menu for each, and then all sounds effects or music are affected."

"Master pitch affects sound volume?" (clarification question)

"Okay. Change the implementation plan with the concrete steps you'll take given everything we just discussed."

"Actually, would individual pitch per sounds be too hard to implement? I often randomize pitch around 0.95, 1.05, for most sounds to add variation."

"OK, then change the implementation plan and the API to include this as well."

"OK, let's get started. Let me test after each step is done."

"OK, you can move on." (after Step 1)

"Yes, next step." (after Step 2)

"Please change the main.lua file with those tests for me."

"Revert, add the previous test that was there to old_main.lua, keep main.lua as your current test."

"Just create a new file named input_tests.lua with the input tests."

"Tell me what the keys do in the audio test."

"ERROR: main.lua:6: Failed to load sound: assets/player_death.ogg..."

"Do not convert to wav, try to make .ogg loading work, as that's what I'll use in the end."

"What does each key do again?"

"Change filter to rough, please."

"Pressing V works, pressing any of the other keys outputs to console but then when I try to close the program it doesn't close and hangs..."

"Great, it seems to work. Next step!"

"Before that, update implementation plan by checking off boxes so far, and also adding any additional work you did (like adding Vorbis)"

"1, 2, 3, 4 don't seem to do anything. Music playing works, though. Also, you're about to auto-compact."

Pending Tasks:

Fix number keys 1-4 not working for volume controls

Step 10: Web audio context unlock

Step 11: Verification on Windows and Web

Update implementation plan checkboxes for steps 5-9

Current Work: User reported "1, 2, 3, 4 don't seem to do anything" for volume controls. I was checking how number keys are named in the input system when user warned about auto-compact. The grep showed number keys should work with '1', '2', etc. as strings. Need to debug why they're not triggering.

Optional Next Step: Debug why number keys 1-4 aren't working for volume controls in main.lua. User's exact quote: "1, 2, 3, 4 don't seem to do anything. Music playing works, though.".

If you need specific details from before compaction (like exact code snippets, error messages, or content you generated), read the full transcript at: C:\Users\adn.claude\projects\E--a327ex-Anchor\e6b9daa6-dbfa-495a-b36a-909fac1f31f0.jsonl Please continue the conversation from where we left it off without asking the user any further questions. Continue with the last task that you were asked to work on.

I need to check the implementation of sound_set_volume and music_set_volume functions in anchor.c to see why they're not working.

Grep (sound_set_volume|music_set_volume)

313:    ma_sound_set_volume(&playing_sounds[slot].sound, volume * sound_master_volume);
367:    ma_sound_set_volume(&music->sound, music_master_volume);
378:static void music_set_volume(float volume) {
382:        ma_sound_set_volume(&current_music->sound, volume);
2520:static int l_sound_set_volume(lua_State* L) {
2548:static int l_music_set_volume(lua_State* L) {
2550:    music_set_volume(volume);
3012:    lua_register(L, "sound_set_volume", l_sound_set_volume);
3016:    lua_register(L, "music_set_volume", l_music_set_volume);

Let me see the full implementation of these Lua wrapper functions.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

2515→    float pitch = (float)luaL_optnumber(L, 3, 1.0);
  2516→    sound_play(sound, volume, pitch);
  2517→    return 0;
  2518→}
  2519→
  2520→static int l_sound_set_volume(lua_State* L) {
  2521→    sound_master_volume = (float)luaL_checknumber(L, 1);
  2522→    return 0;
  2523→}
  2524→
  2525→static int l_music_load(lua_State* L) {
  2526→    const char* path = luaL_checkstring(L, 1);
  2527→    Music* music = music_load(path);
  2528→    if (!music) {
  2529→        return luaL_error(L, "Failed to load music: %s", path);
  2530→    }
  2531→    lua_pushlightuserdata(L, music);
  2532→    return 1;
  2533→}
  2534→
  2535→static int l_music_play(lua_State* L) {
  2536→    Music* music = (Music*)lua_touserdata(L, 1);
  2537→    bool loop = lua_toboolean(L, 2);
  2538→    music_play(music, loop);
  2539→    return 0;
  2540→}
  2541→
  2542→static int l_music_stop(lua_State* L) {
  2543→    (void)L;
  2544→    music_stop();
... [20 more lines]

I see l_sound_set_volume just sets the global sound_master_volume variable, which is fine for new sounds. Let me check the music_set_volume C function implementation.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

375→    }
   376→}
   377→
   378→static void music_set_volume(float volume) {
   379→    music_master_volume = volume;
   380→    // Apply to currently playing music
   381→    if (current_music && current_music->initialized) {
   382→        ma_sound_set_volume(&current_music->sound, volume);
   383→    }
   384→}
   385→
   386→// Master pitch (slow-mo) - affects all currently playing audio
   387→static void audio_set_master_pitch(float pitch) {
   388→    audio_master_pitch = pitch;
   389→

The volume functions look correct. Let me check how number keys are mapped in the input system.

Grep (key_map[|\"1\"|\"2\"|\"3\"|\"4\")

No matches found

Grep (SDL_SCANCODE|SDLK_)

882:    if (!name) return SDL_SCANCODE_UNKNOWN;
887:        if (c >= 'a' && c <= 'z') return SDL_SCANCODE_A + (c - 'a');
888:        if (c >= 'A' && c <= 'Z') return SDL_SCANCODE_A + (c - 'A');
889:        if (c >= '0' && c <= '9') return SDL_SCANCODE_0 + (c - '0');
893:    if (strcmp(name, "space") == 0) return SDL_SCANCODE_SPACE;
894:    if (strcmp(name, "enter") == 0 || strcmp(name, "return") == 0) return SDL_SCANCODE_RETURN;
895:    if (strcmp(name, "escape") == 0 || strcmp(name, "esc") == 0) return SDL_SCANCODE_ESCAPE;
896:    if (strcmp(name, "backspace") == 0) return SDL_SCANCODE_BACKSPACE;
897:    if (strcmp(name, "tab") == 0) return SDL_SCANCODE_TAB;
898:    if (strcmp(name, "capslock") == 0) return SDL_SCANCODE_CAPSLOCK;
901:    if (strcmp(name, "left") == 0) return SDL_SCANCODE_LEFT;
902:    if (strcmp(name, "right") == 0) return SDL_SCANCODE_RIGHT;
903:    if (strcmp(name, "up") == 0) return SDL_SCANCODE_UP;
904:    if (strcmp(name, "down") == 0) return SDL_SCANCODE_DOWN;
907:    if (strcmp(name, "lshift") == 0) return SDL_SCANCODE_LSHIFT;
908:    if (strcmp(name, "rshift") == 0) return SDL_SCANCODE_RSHIFT;
909:    if (strcmp(name, "shift") == 0) return SDL_SCANCODE_LSHIFT;  // Default to left
910:    if (strcmp(name, "lctrl") == 0) return SDL_SCANCODE_LCTRL;
911:    if (strcmp(name, "rctrl") == 0) return SDL_SCANCODE_RCTRL;
912:    if (strcmp(name, "ctrl") == 0) return SDL_SCANCODE_LCTRL;
913:    if (strcmp(name, "lalt") == 0) return SDL_SCANCODE_LALT;
914:    if (strcmp(name, "ralt") == 0) return SDL_SCANCODE_RALT;
915:    if (strcmp(name, "alt") == 0) return SDL_SCANCODE_LALT;
918:    if (strcmp(name, "f1") == 0) return SDL_SCANCODE_F1;
919:    if (strcmp(name, "f2") == 0) return SDL_SCANCODE_F2;
920:    if (strcmp(name, "f3") == 0) return SDL_SCANCODE_F3;
921:    if (strcmp(name, "f4") == 0) return SDL_SCANCODE_F4;
922:    if (strcmp(name, "f5") == 0) return SDL_SCANCODE_F5;
923:    if (strcmp(name, "f6") == 0) return SDL_SCANCODE_F6;
924:    if (strcmp(name, "f7") == 0) return SDL_SCANCODE_F7;
... [2 more lines]

I see the key mapping handles single digit characters at line 889. Let me look at the full function to understand the logic.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

878→}
   879→
   880→// Convert key name string to SDL scancode
   881→static SDL_Scancode key_name_to_scancode(const char* name) {
   882→    if (!name) return SDL_SCANCODE_UNKNOWN;
   883→
   884→    // Single character keys (a-z, 0-9)
   885→    if (strlen(name) == 1) {
   886→        char c = name[0];
   887→        if (c >= 'a' && c <= 'z') return SDL_SCANCODE_A + (c - 'a');
   888→        if (c >= 'A' && c <= 'Z') return SDL_SCANCODE_A + (c - 'A');
   889→        if (c >= '0' && c <= '9') return SDL_SCANCODE_0 + (c - '0');
   890→    }
   891→
   892→    // Named keys
   893→    if (strcmp(name, "space") == 0) return SDL_SCANCODE_SPACE;
   894→    if (strcmp(name, "enter") == 0 || strcmp(name, "return") == 0) return SDL_SCANCODE_RETURN;
   895→    if (strcmp(name, "escape") == 0 || strcmp(name, "esc") == 0) return SDL_SCANCODE_ESCAPE;
   896→    if (strcmp(name, "backspace") == 0) return SDL_SCANCODE_BACKSPACE;
   897→    if (strcmp(name, "tab") == 0) return SDL_SCANCODE_TAB;
   898→    if (strcmp(name, "capslock") == 0) return SDL_SCANCODE_CAPSLOCK;
   899→
   900→    // Arrow keys
   901→    if (strcmp(name, "left") == 0) return SDL_SCANCODE_LEFT;
   902→    if (strcmp(name, "right") == 0) return SDL_SCANCODE_RIGHT;
   903→    if (strcmp(name, "up") == 0) return SDL_SCANCODE_UP;
   904→    if (strcmp(name, "down") == 0) return SDL_SCANCODE_DOWN;
   905→
   906→    // Modifier keys
   907→    if (strcmp(name, "lshift") == 0) return SDL_SCANCODE_LSHIFT;
... [5 more lines]

Let me check the key_is_pressed implementation to make sure it's working correctly.

Grep (key_is_pressed)

2688-        lua_pushboolean(L, keys_current[scancode]);
2689-    }
2690-    return 1;
2691-}
2692-
2693:static int l_key_is_pressed(lua_State* L) {
2694-    const char* key_name = luaL_checkstring(L, 1);
2695-    SDL_Scancode scancode = key_name_to_scancode(key_name);
2696-    if (scancode == SDL_SCANCODE_UNKNOWN) {
2697-        lua_pushboolean(L, 0);
2698-    } else {
--
3032-    lua_register(L, "layer_draw", l_layer_draw);
3033-    lua_register(L, "layer_get_texture", l_layer_get_texture);
3034-    lua_register(L, "layer_reset_effects", l_layer_reset_effects);
3035-    // Input - Keyboard
3036-    lua_register(L, "key_is_down", l_key_is_down);
3037:    lua_register(L, "key_is_pressed", l_key_is_pressed);
3038-    lua_register(L, "key_is_released", l_key_is_released);
3039-    // Input - Mouse
3040-    lua_register(L, "mouse_position", l_mouse_position);
3041-    lua_register(L, "mouse_delta", l_mouse_delta);
3042-    lua_register(L, "mouse_set_visible", l_mouse_set_visible);

Read (E:\a327ex\Anchor\engine\src\anchor.c)

2693→static int l_key_is_pressed(lua_State* L) {
  2694→    const char* key_name = luaL_checkstring(L, 1);
  2695→    SDL_Scancode scancode = key_name_to_scancode(key_name);
  2696→    if (scancode == SDL_SCANCODE_UNKNOWN) {
  2697→        lua_pushboolean(L, 0);
  2698→    } else {
  2699→        lua_pushboolean(L, keys_current[scancode] && !keys_previous[scancode]);
  2700→    }
  2701→    return 1;
  2702→}
  2703→
  2704→static int l_key_is_released(lua_State* L) {
  2705→    const char* key_name = luaL_checkstring(L, 1);
  2706→    SDL_Scancode scancode = key_name_to_scancode(key_name);
  2707→    if (scancode == SDL_SCANCODE_UNKNOWN) {

I found the bug. The SDL scancodes for number keys are ordered as 1-9, then 0 (matching keyboard layout), not 0-9. The current code assumes SDL_SCANCODE_0 + 1 equals SDL_SCANCODE_1, but that's incorrect.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   880→// Convert key name string to SDL scancode
   881→static SDL_Scancode key_name_to_scancode(const char* name) {
   882→    if (!name) return SDL_SCANCODE_UNKNOWN;
   883→
   884→    // Single character keys (a-z, 0-9)
   885→    if (strlen(name) == 1) {
   886→        char c = name[0];
   887→        if (c >= 'a' && c <= 'z') return SDL_SCANCODE_A + (c - 'a');
   888→        if (c >= 'A' && c <= 'Z') return SDL_SCANCODE_A + (c - 'A');
   889→        // SDL scancodes: 1-9 are sequential, then 0 (keyboard layout order)
   890→        if (c == '0') return SDL_SCANCODE_0;
   891→        if (c >= '1' && c <= '9') return SDL_SCANCODE_1 + (c - '1');
   892→    }
   893→
   894→    // Named keys
   895→    if (strcmp(name, "space") == 0) return SDL_SCANCODE_SPACE;
   896→    if (strcmp(name, "enter") == 0 || strcmp(name, "return") == 0) return SDL_SCANCODE_RETURN;

Now let me rebuild the engine.

Bash (cd E:/a327ex/Anchor/engine && ./build.bat)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(855): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(849): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1241): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1519): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1525): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1635): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1644): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1738): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1740): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2385): 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

Fixed. The bug was in the number key mapping - SDL scancodes are ordered as 1-9 then 0 (matching keyboard layout), not 0-9 sequentially. The code was using SDL_SCANCODE_0 + (c - '0') which gave wrong values for keys 1-9.

Number keys should work now. Test with:

1 - Sound volume 50%
2 - Sound volume 100%
3 - Music volume 50%
4 - Music volume 100%

Ok, it works. Can we make volume like, proper? There's a wrong way to do it and a right way to do it that involves some math. I don't remember what it is exactly, but it's like the atenuation function or something of that nature. Do you know what I'm talking about?

Yes, you're talking about logarithmic volume scaling (or perceptual volume). Human hearing is logarithmic - we perceive loudness on a decibel scale, not linear amplitude. So a linear slider at 0.5 doesn't sound "half as loud" - it sounds much louder than that perceptually.

Common approaches:

Power curve (simplest): actual = linear^2 or linear^3
- 0.5 on slider → 0.25 actual amplitude
- Easy to implement, feels natural
Exponential/dB-based: Map slider to decibel range (e.g., -60dB to 0dB)
- actual = 10^((slider * range_dB) / 20)
- More "correct" but similar result
Common game formula: actual = slider * slider (same as #1 with exponent 2)

The power curve with exponent 2 or 3 is what most games use because it's simple and effective. Do you want me to apply this to sound_set_volume and music_set_volume?

I could either:

A) Apply the curve in the C functions (Lua passes 0-1 linear, C converts)
B) Keep C functions linear, document that Lua should pass volume^2

Option A is probably cleaner - the API user thinks in terms of "50% volume" and the engine handles the perception math.

Yes, go for option A. For the test, make music volume go up and down slowly, over 5 seconds, from 0 to 100, 100 to 0. Each full movement should take 5 seconds.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

375→    }
   376→}
   377→
   378→static void music_set_volume(float volume) {
   379→    music_master_volume = volume;
   380→    // Apply to currently playing music
   381→    if (current_music && current_music->initialized) {
   382→        ma_sound_set_volume(&current_music->sound, volume);
   383→    }
   384→}
   385→
   386→// Master pitch (slow-mo) - affects all currently playing audio
   387→static void audio_set_master_pitch(float pitch) {
   388→    audio_master_pitch = pitch;
   389→

Grep (music_play|ma_sound_set_volume.*music)

357:static void music_play(Music* music, bool loop) {
367:    ma_sound_set_volume(&music->sound, music_master_volume);
382:        ma_sound_set_volume(&current_music->sound, volume);
2537:static int l_music_play(lua_State* L) {
2540:    music_play(music, loop);
3016:    lua_register(L, "music_play", l_music_play);

Let me add the perceptual volume helper and apply it in all the right places.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

270→            ma_sound_uninit(&playing_sounds[i].sound);
   271→            playing_sounds[i].in_use = false;
   272→        }
   273→    }
   274→}
   275→
   276→// Play a sound with volume and pitch
   277→static void sound_play(Sound* sound, float volume, float pitch) {
   278→    if (!audio_initialized || !sound) return;
   279→
   280→    // Find a free slot
   281→    int slot = -1;
   282→    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
   283→        if (!playing_sounds[i].in_use) {
   284→            slot = i;

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   272→        }
   273→    }
   274→}
   275→
   276→// Convert linear volume (0-1) to perceptual volume using power curve
   277→static float linear_to_perceptual(float linear) {
   278→    return linear * linear;
   279→}
   280→
   281→// Play a sound with volume and pitch
   282→static void sound_play(Sound* sound, float volume, float pitch) {
   283→    if (!audio_initialized || !sound) return;
   284→
   285→    // Find a free slot
   286→    int slot = -1;

Now apply it to the volume settings.

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   313→        fprintf(stderr, "Failed to play sound: %s (error %d)\n", sound->path, result);
   314→        return;
   315→    }
   316→
   317→    // Apply volume: per-play volume * master volume (perceptual scaling)
   318→    ma_sound_set_volume(&playing_sounds[slot].sound, linear_to_perceptual(volume * sound_master_volume));
   319→
   320→    // Apply pitch: per-play pitch * master pitch
   321→    ma_sound_set_pitch(&playing_sounds[slot].sound, pitch * audio_master_pitch);
   322→

Grep (ma_sound_set_volume(&music)

370-    current_music = music;
371-    ma_sound_set_looping(&music->sound, loop);
372:    ma_sound_set_volume(&music->sound, music_master_volume);
373-    ma_sound_seek_to_pcm_frame(&music->sound, 0);  // Restart from beginning
374-    ma_sound_start(&music->sound);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   366→    if (current_music && current_music != music) {
   367→        ma_sound_stop(&current_music->sound);
   368→    }
   369→
   370→    current_music = music;
   371→    ma_sound_set_looping(&music->sound, loop);
   372→    ma_sound_set_volume(&music->sound, linear_to_perceptual(music_master_volume));
   373→    ma_sound_seek_to_pcm_frame(&music->sound, 0);  // Restart from beginning
   374→    ma_sound_start(&music->sound);
   375→}
   376→
   377→static void music_stop(void) {

Read (E:\a327ex\Anchor\engine\src\anchor.c)

380→    }
   381→}
   382→
   383→static void music_set_volume(float volume) {
   384→    music_master_volume = volume;
   385→    // Apply to currently playing music
   386→    if (current_music && current_music->initialized) {
   387→        ma_sound_set_volume(&current_music->sound, volume);
   388→    }
   389→}
   390→
   391→// Master pitch (slow-mo) - affects all currently playing audio
   392→static void audio_set_master_pitch(float pitch) {
   393→    audio_master_pitch = pitch;
   394→

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   379→        ma_sound_stop(&current_music->sound);
   380→    }
   381→}
   382→
   383→static void music_set_volume(float volume) {
   384→    music_master_volume = volume;
   385→    // Apply to currently playing music (perceptual scaling)
   386→    if (current_music && current_music->initialized) {
   387→        ma_sound_set_volume(&current_music->sound, linear_to_perceptual(volume));
   388→    }
   389→}
   390→
   391→// Master pitch (slow-mo) - affects all currently playing audio
   392→static void audio_set_master_pitch(float pitch) {
   393→    audio_master_pitch = pitch;

Now let me update the test file to oscillate music volume.

Edit (E:\a327ex\Anchor\test\main.lua)

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:
    19→local ball_y = screen_h / 2
    20→local ball_vx = 100
    21→local ball_vy = 80
    22→
    23→-- Master pitch state
    24→local master_pitch = 1.0
    25→
    26→-- Volume oscillation state
    27→local volume_time = 0
    28→local cycle_duration = 10  -- 5 seconds up, 5 seconds down
    29→
    30→function update(dt)
    31→    -- Update volume oscillation (triangle wave: 0→1 in 5s, 1→0 in 5s)
    32→    volume_time = volume_time + dt
    33→    local cycle_pos = volume_time % cycle_duration
    34→    local volume
    35→    if cycle_pos < 5 then
    36→        volume = cycle_pos / 5  -- 0 to 1 over 5 seconds
    37→    else
    38→        volume = 1 - (cycle_pos - 5) / 5  -- 1 to 0 over 5 seconds
    39→    end
    40→    music_set_volume(volume)
    41→    -- Update ball position
    42→    ball_x = ball_x + ball_vx * dt
    43→    ball_y = ball_y + ball_vy * dt
    44→

Let me also remove the manual music volume controls (3 and 4) since we're auto-oscillating now.

Read (E:\a327ex\Anchor\test\main.lua)

88→        print(string.format("Master pitch: %.2f", master_pitch))
    89→    end
    90→
    91→    -- === Volume controls ===
    92→    -- 1: sound volume 50%
    93→    if key_is_pressed('1') then
    94→        sound_set_volume(0.5)
    95→        print("Sound volume: 50%")
    96→    end
    97→    -- 2: sound volume 100%
    98→    if key_is_pressed('2') then
    99→        sound_set_volume(1.0)
   100→        print("Sound volume: 100%")
   101→    end
   102→    -- 3: music volume 50%
   103→    if key_is_pressed('3') then
   104→        music_set_volume(0.5)
   105→        print("Music volume: 50%")
   106→    end
   107→    -- 4: music volume 100%
   108→    if key_is_pressed('4') then
   109→        music_set_volume(1.0)
   110→        print("Music volume: 100%")
   111→    end
   112→

Edit (E:\a327ex\Anchor\test\main.lua)

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:
    87→        audio_set_master_pitch(master_pitch)
    88→        print(string.format("Master pitch: %.2f", master_pitch))
    89→    end
    90→
    91→    -- === Volume controls ===
    92→    -- 1: sound volume 50%
    93→    if key_is_pressed('1') then
    94→        sound_set_volume(0.5)
    95→        print("Sound volume: 50%")
    96→    end
    97→    -- 2: sound volume 100%
    98→    if key_is_pressed('2') then
    99→        sound_set_volume(1.0)
   100→        print("Sound volume: 100%")
   101→    end
   102→    -- Music volume auto-oscillates (0→100%→0 over 10 seconds)
   103→
   104→    -- Draw
   105→    layer_rectangle(game_layer, 0, 0, screen_w, screen_h, bg_color)
   106→    layer_circle(game_layer, ball_x, ball_y, 30, white)

Now let me build the engine.

Bash (cd E:/a327ex/Anchor/engine && ./build.bat)

anchor.c
src/anchor.c(215): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(860): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(854): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1246): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1524): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1530): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1640): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1649): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1743): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1745): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2390): 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

Done. The test now:

Music volume automatically oscillates 0→100%→0 over 10 seconds (5s each way)
Perceptual volume scaling (linear²) applied to both sounds and music

Press M to start music and watch the volume rise and fall smoothly.

Print the % too, please.

Edit (E:\a327ex\Anchor\test\main.lua)

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:
    27→local volume_time = 0
    28→local cycle_duration = 10  -- 5 seconds up, 5 seconds down
    29→
    30→function update(dt)
    31→    -- Update volume oscillation (triangle wave: 0→1 in 5s, 1→0 in 5s)
    32→    volume_time = volume_time + dt
    33→    local cycle_pos = volume_time % cycle_duration
    34→    local volume
    35→    if cycle_pos < 5 then
    36→        volume = cycle_pos / 5  -- 0 to 1 over 5 seconds
    37→    else
    38→        volume = 1 - (cycle_pos - 5) / 5  -- 1 to 0 over 5 seconds
    39→    end
    40→    music_set_volume(volume)
    41→    print(string.format("Music volume: %.0f%%", volume * 100))
    42→    -- Update ball position
    43→    ball_x = ball_x + ball_vx * dt
    44→    ball_y = ball_y + ball_vy * dt
    45→

Done. No rebuild needed - it's a Lua-only change.

Seems correct. Change implementation plan with everything we did.

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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→```
... [120 more lines]

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

300→- [x] Added delta time clamping before accumulator (handles pause/resume, debugger)
   301→- [x] Added render_lag cap at 2× RENDER_RATE (prevents unbounded growth)
   302→- [x] Render rate limiting at 60Hz for consistent chunky pixel movement on all monitors
   303→- [x] Verified via simulator: consistent 2 physics updates per rendered frame on 60Hz, 59.94Hz, 144Hz, 240Hz monitors
   304→- [x] See `reference/frame-timing-analysis.md` for detailed analysis
   305→
   306→### Lua API (C bindings)
   307→
   308→```lua
   309→-- Layer management
   310→game = layer_create('game')
   311→
   312→-- Shapes
   313→layer_rectangle(game, x, y, w, h, color)
   314→layer_circle(game, x, y, radius, color)
   315→
   316→-- Transforms
   317→layer_push(game, x, y, r, sx, sy)
   318→layer_pop(game)
   319→
   320→-- Sprites
   321→local img = texture_load('player.png')
   322→layer_draw_image(game, img, x, y, r, sx, sy, ox, oy, color)
   323→
   324→-- Blend modes ('alpha' or 'additive')
   325→layer_set_blend_mode(game, 'additive')
   326→layer_set_blend_mode(game, 'alpha')
   327→
   328→-- Color helper
   329→local red = rgba(255, 0, 0, 255)
... [120 more lines]

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

450→- [x] `layer_apply_shader()` ping-pong works (single effect)
   451→- [x] `layer_apply_shader()` chaining works (multiple effects)
   452→- [x] Per-object flash vertex attribute in uber-shader
   453→- [x] Outline shader produces correct visual result (5x5 neighbor sampling)
   454→- [x] Shadow shader produces correct visual result (gray with offset)
   455→- [x] Manual layer compositing with offset support
   456→
   457→**Deliverable:** Post-processing effects (outline, shadow) and per-object flash. ✓ Complete
   458→
   459→---
   460→
   461→## Phase 5: Input
   462→
   463→**Goal:** Action-based input system with keyboard, mouse, and gamepad support. Includes advanced features: chords, sequences, holds, input type detection, and rebinding capture.
   464→
   465→See `reference/input-system-research.md` for research on input systems across 17+ game engines.
   466→
   467→---
   468→
   469→### Architecture Overview
   470→
   471→**Action-based input:** Physical inputs (keys, buttons) map to named actions. Game code queries actions, not raw keys.
   472→
   473→**Control string format:** `type:key` — e.g., `'key:space'`, `'mouse:1'`, `'button:a'`, `'axis:leftx+'`
   474→
   475→**Unified query system:** Actions, chords, sequences, and holds all use the same `is_pressed`/`is_down`/`is_released` functions.
   476→
   477→**Edge detection:** Standard previous/current frame comparison for pressed (just this frame) and released (just this frame).
   478→
   479→---
... [120 more lines]

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

650→
   651→-- In update:
   652→if is_pressed('super_jump') then
   653→    -- Triggers once when both Shift AND Space are held
   654→    player:super_jump()
   655→end
   656→```
   657→
   658→#### Sequences (combos, double-tap)
   659→
   660→```lua
   661→-- Sequence triggers when actions are pressed in order within time windows
   662→-- Format: {action1, delay1, action2, delay2, action3, ...}
   663→-- delay = max seconds allowed before next action
   664→input_bind_sequence('sequence_name', {action1, delay, action2, ...})
   665→
   666→-- Example: double-tap D to dash (press D, then D again within 0.3s)
   667→input_bind_sequence('dash', {'d', 0.3, 'd'})
   668→
   669→-- Example: fighting game combo (down, down-right, right, punch within 0.5s each)
   670→input_bind_sequence('hadouken', {'down', 0.5, 'downright', 0.5, 'right', 0.5, 'punch'})
   671→
   672→-- In update:
   673→if is_pressed('dash') then
   674→    -- Triggers once when sequence completes
   675→    player:dash()
   676→end
   677→```
   678→
   679→#### Holds (charge attacks)
... [70 more lines]

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

750→
   751→-- Gamepad buttons are accessed via action system:
   752→-- After input_bind_all(), use is_pressed('button_a'), is_pressed('button_x'), etc.
   753→```
   754→
   755→#### Input Type Detection
   756→
   757→```lua
   758→-- Returns 'keyboard', 'mouse', or 'gamepad'
   759→-- Updates whenever user provides input
   760→local input_type = input_get_last_type()
   761→
   762→-- Example: switch UI prompts based on input device
   763→if input_type == 'gamepad' then
   764→    show_prompt("Press A to continue")
   765→else
   766→    show_prompt("Press Space to continue")
   767→end
   768→```
   769→
   770→#### Rebinding Capture
   771→
   772→```lua
   773→-- For options menu: capture next input to rebind a control
   774→
   775→-- Start capture mode (suppresses normal input, waits for any key/button/axis)
   776→input_start_capture()
   777→
   778→-- Check if something was captured (returns control string or nil)
   779→local captured = input_get_captured()  -- e.g., 'key:space', 'button:a', 'axis:leftx+'
... [120 more lines]

Read (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

895→- [ ] Store as global, apply when playing sounds
   896→- [ ] Lua binding
   897→
   898→**Step 6: Music loading**
   899→- [ ] `music_load(path)` — returns Music userdata
   900→- [ ] Streaming playback (not fully loaded into memory)
   901→- [ ] Lua binding
   902→
   903→**Step 7: Music playback**
   904→- [ ] `music_play(music)` — play once
   905→- [ ] `music_play(music, loop)` — loop if true
   906→- [ ] `music_stop()` — stop current music
   907→- [ ] Only one music track at a time
   908→- [ ] Lua bindings
   909→
   910→**Step 8: Music master volume**
   911→- [ ] `music_set_volume(volume)` — 0 to 1
   912→- [ ] Lua binding
   913→
   914→**Step 9: Master pitch (slow-mo)**
   915→- [ ] `audio_set_master_pitch(pitch)` — affects all audio
   916→- [ ] Multiplies with per-play pitch: `final = per_play_pitch × master_pitch`
   917→- [ ] Must work on currently playing sounds (real-time adjustment)
   918→- [ ] Lua binding
   919→
   920→**Step 10: Web audio context unlock**
   921→- [ ] Handle browser requirement for user interaction before audio
   922→- [ ] Unlock on first input event (key/mouse/touch)
   923→
   924→**Step 11: Verification**
... [70 more lines]

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   889→- [x] Per-play pitch for variation (e.g., random 0.95-1.05)
   890→- [x] Sound instance pool (64 slots) with main-thread cleanup to avoid audio thread issues
   891→- [x] Lua binding
   892→
   893→**Step 5: Sound master volume**
   894→- [x] `sound_set_volume(volume)` — 0 to 1, affects all sound effects
   895→- [x] Store as global, apply when playing sounds
   896→- [x] Lua binding
   897→
   898→**Step 6: Music loading**
   899→- [x] `music_load(path)` — returns Music userdata
   900→- [x] Streaming playback (not fully loaded into memory)
   901→- [x] Lua binding
   902→
   903→**Step 7: Music playback**
   904→- [x] `music_play(music)` — play once
   905→- [x] `music_play(music, loop)` — loop if true
   906→- [x] `music_stop()` — stop current music
   907→- [x] Only one music track at a time
   908→- [x] Lua bindings
   909→
   910→**Step 8: Music master volume**
   911→- [x] `music_set_volume(volume)` — 0 to 1
   912→- [x] Lua binding
   913→
   914→**Step 9: Master pitch (slow-mo)**
   915→- [x] `audio_set_master_pitch(pitch)` — affects all audio
   916→- [x] Multiplies with per-play pitch: `final = per_play_pitch × master_pitch`
   917→- [x] Must work on currently playing sounds (real-time adjustment)
... [26 more lines]

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   967→```
   968→
   969→---
   970→
   971→### Verification Checklist
   972→
   973→- [x] Step 1-2: miniaudio initializes without errors
   974→- [x] Step 3-4: Sound loads and plays with volume/pitch
   975→- [x] Step 5: Sound master volume affects all sound effects
   976→- [x] Step 6-7: Music loads, plays, loops, stops
   977→- [x] Step 8: Music master volume works
   978→- [x] Step 9: Master pitch affects all playing audio in real-time
   979→- [x] Step 10: Perceptual volume scaling produces natural-feeling volume changes
   980→- [x] Step 11: Number keys 1-9 and 0 work correctly
   981→- [ ] Step 12-13: Web build works with audio context unlock
   982→- [ ] All steps verified on Windows and Web
   983→
   984→**Deliverable:** Audio with pitch shifting, separate volume controls, and perceptual scaling.
   985→
   986→---
   987→
   988→## Phase 7: Physics

Let me also update the summary table at the top.

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
     8→
     9→| Area | Decision | Rationale |
    10→|------|----------|-----------|
    11→| Renderer | OpenGL | Smooth rotation, additive blending, performance headroom, console-portable |
    12→| Audio | miniaudio + stb_vorbis | Single-header, pitch shifting, OGG support |
    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 |

Done. Updated the implementation plan:

Summary table: Audio changed from "TBD" to "miniaudio + stb_vorbis"
Steps 5-9: Marked complete (volume controls, music, master pitch)
Step 10: Added perceptual volume scaling (linear² curve)
Step 11: Added number key scancode bug fix
Steps 12-13: Renumbered web audio context and verification
Verification checklist updated with all completed items

Remaining for Phase 6: Web audio context unlock and Web verification.

Yes, go ahead.

Let me check how audio is currently initialized and how to add the web audio context unlock.

Grep (ma_engine_init|audio_initialized)

149-
150-// Audio globals (declared early so Sound functions can use them)
151-static ma_engine audio_engine;
152:static bool audio_initialized = false;
153-static float sound_master_volume = 1.0f;
154-static float music_master_volume = 1.0f;
155-static float audio_master_pitch = 1.0f;
--
217-
218-    // Verify the file can be loaded by attempting to init a sound
219-    // This also pre-caches the decoded audio in miniaudio's resource manager
220:    if (audio_initialized) {
221-        ma_sound test_sound;
222-        ma_result result = ma_sound_init_from_file(&audio_engine, path, MA_SOUND_FLAG_DECODE, NULL, NULL, &test_sound);
223-        if (result != MA_SUCCESS) {
--
250-
251-// Clean up finished sounds (call from main thread each frame)
252-static void sound_cleanup_finished(void) {
253:    if (!audio_initialized) return;
254-
255-    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
256-        if (playing_sounds[i].in_use) {
--
280-
281-// Play a sound with volume and pitch
282-static void sound_play(Sound* sound, float volume, float pitch) {
283:    if (!audio_initialized || !sound) return;
284-
285-    // Find a free slot
... [41 more lines]

WebSearch (miniaudio emscripten web audio context unlock user interaction 2025)

Web search results for query: "miniaudio emscripten web audio context unlock user interaction 2025"

Links: [{"title":"Wasm Audio Worklets API — Emscripten 4.0.23-git (dev) documentation","url":"https://emscripten.org/docs/api_reference/wasm_audio_worklets.html"},{"title":"Audio — Emscripten 4.0.21-git (dev) documentation","url":"https://emscripten.org/docs/porting/Audio.html"},{"title":"miniaudio.h - GitHub","url":"https://raw.githubusercontent.com/mackron/miniaudio/master/miniaudio.h"},{"title":"Miniaudio.h & wasm-worker issues. · Issue #21255 · emscripten-core/emscripten","url":"https://github.com/emscripten-core/emscripten/issues/21255"},{"title":"miniaudio/CHANGES.md at master · mackron/miniaudio","url":"https://github.com/mackron/miniaudio/blob/master/CHANGES.md"},{"title":"Feedback on AudioWorklets API · Issue #18853 · emscripten-core/emscripten","url":"https://github.com/emscripten-core/emscripten/issues/18853"},{"title":"Looking for advice on WebAudio problem on iOS Safari","url":"https://groups.google.com/g/emscripten-discuss/c/5IjbNzHi9CQ"},{"title":"Releases · mackron/miniaudio","url":"https://github.com/mackron/miniaudio/releases"},{"title":"miniaudio - A single file audio playback and capture library.","url":"https://miniaud.io/docs/examples/custom_backend.html"},{"title":"Work when AudioContext is not supported · Issue #23290 · emscripten-core/emscripten","url":"https://github.com/emscripten-core/emscripten/issues/23290"}]

Based on my search, here's what I found about miniaudio, Emscripten, and Web Audio context unlock with user interaction:

## Key Findings

### Web Audio Context User Interaction Requirement

"Since on web pages audio playback can only be initiated as a response to user input, we will also register an event handler which resumes the audio context when the user clicks on the DOM Canvas element that exists on the page."(no content)On iOS Safari since iOS9, WebAudio will only work if 'unlocked' from an input event handler connected to a touch input event.

### Miniaudio's Emscripten/Web Support

Miniaudio added support for AudioWorklets on Web/Emscripten. This is opt-in and can be enabled by defining MA_ENABLE_AUDIO_WORKLETS. You must compile with `-sAUDIO_WORKLET=1 -sWASM_WORKERS=1 -sASYNCIFY` for this to work. Requires at least Emscripten v3.1.32.

### Recent Fixes in Miniaudio (Web-related)

Web: Fix ScriptProcessorNode path when compiling with `--closure=1`. Note that the Audio Worklets path is not currently working due to the callback specified in `emscripten_create_wasm_audio_worklet_processor_async` never getting fired.(no content)Web: Fix an error with the unlocked notification when compiling as C++. Web: Fix a JavaScript error when initializing and then uninitializing a context before any interactivity.(no content)Web: Infrastructure has been added to support configurable buffer sizes. In practice this is still restricted to 128 frames, but once Emscripten adds full support for configuration of the buffer size, it will be trivial to add support to miniaudio.

### Workarounds for iOS/Safari Audio Unlock

One approach is hooking to a touch event via the emscripten event functions and then using EM_ASM to unlock the WebAudio context, avoiding delays to main() execution and instead letting the application 'freeze' until the user taps to unfreeze.

### Known Issues

There have been reports of issues with miniaudio and Emscripten where sound should play but keeps silent, using emsdk version 3.1.50.(no content)Many online games using emscripten crash if AudioContext is not supported, including most Unity and SDL games. These crashes are preventable if emscripten would have audio playback be a no-op when AudioContext is not supported.


REMINDER: You MUST include the sources above in your response to the user using markdown hyperlinks.

WebFetch (https://emscripten.org/docs/porting/Audio.html)

# Web Audio Context Unlock on User Interaction

Based on the provided documentation, the page discusses Emscripten's OpenAL implementation but doesn't directly address SDL or miniaudio.

However, regarding the general approach with OpenAL in Emscripten: the framework automatically handles user interaction requirements. According to the documentation, "Emscripten's OpenAL implementation (and also SDL1) will automatically listen for a user click or keypress on the document and the canvas, and resume audio for you."

The implementation uses an internal function called `autoResumeAudioContext()` to accomplish this automatic resumption.

**For SDL and miniaudio specifically:** The provided documentation doesn't contain information about how these libraries handle audio context unlocking. You would need to consult their respective documentation or source code to understand their specific mechanisms for managing browser audio context permissions on user interaction.

Let me implement the web audio context unlock. I'll add a flag that triggers ma_engine_start() on the first user interaction.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

148→} Layer;
   149→
   150→// Audio globals (declared early so Sound functions can use them)
   151→static ma_engine audio_engine;
   152→static bool audio_initialized = false;
   153→static float sound_master_volume = 1.0f;
   154→static float music_master_volume = 1.0f;
   155→static float audio_master_pitch = 1.0f;
   156→
   157→// Texture
   158→typedef struct {
   159→    GLuint id;
   160→    int width;
   161→    int height;
   162→} Texture;

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   146→    // Current state
   147→    uint8_t current_blend;
   148→} Layer;
   149→
   150→// Audio globals (declared early so Sound functions can use them)
   151→static ma_engine audio_engine;
   152→static bool audio_initialized = false;
   153→static float sound_master_volume = 1.0f;
   154→static float music_master_volume = 1.0f;
   155→static float audio_master_pitch = 1.0f;
   156→#ifdef __EMSCRIPTEN__
   157→static bool audio_needs_unlock = true;  // Web requires user interaction to start audio
   158→#endif
   159→
   160→// Texture
   161→typedef struct {
   162→    GLuint id;

Now let me add the unlock function and find where to call it in the event loop.

Grep (SDL_KEYDOWN|SDL_MOUSEBUTTONDOWN)

3470-            running = false;
3471-        }
3472-        // Track keyboard state
3473:        if (event.type == SDL_KEYDOWN && !event.key.repeat) {
3474-            last_input_type = INPUT_TYPE_KEYBOARD;
3475-            SDL_Scancode sc = event.key.keysym.scancode;
3476-            if (sc < SDL_NUM_SCANCODES) {
--
3513-            mouse_dy += event.motion.yrel;
3514-        }
3515-        // Track mouse buttons
3516:        if (event.type == SDL_MOUSEBUTTONDOWN) {
3517-            last_input_type = INPUT_TYPE_MOUSE;
3518-            int btn = event.button.button - 1;  // SDL buttons are 1-indexed
3519-            if (btn >= 0 && btn < MAX_MOUSE_BUTTONS) {

Read (E:\a327ex\Anchor\engine\src\anchor.c)

395→static void audio_set_master_pitch(float pitch) {
   396→    audio_master_pitch = pitch;
   397→
   398→    // Update all playing sounds
   399→    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
   400→        if (playing_sounds[i].in_use) {
   401→            ma_sound_set_pitch(&playing_sounds[i].sound, pitch);
   402→        }
   403→    }
   404→
   405→    // Update music
   406→    if (current_music && current_music->initialized) {
   407→        ma_sound_set_pitch(&current_music->sound, pitch);
   408→    }
   409→}
   410→
   411→// Create a layer with FBO at specified resolution
   412→static Layer* layer_create(int width, int height) {
   413→    Layer* layer = (Layer*)calloc(1, sizeof(Layer));
   414→    if (!layer) return NULL;

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
   391→    }
   392→}
   393→
   394→// Master pitch (slow-mo) - affects all currently playing audio
   395→static void audio_set_master_pitch(float pitch) {
   396→    audio_master_pitch = pitch;
   397→
   398→    // Update all playing sounds
   399→    for (int i = 0; i < MAX_PLAYING_SOUNDS; i++) {
   400→        if (playing_sounds[i].in_use) {
   401→            ma_sound_set_pitch(&playing_sounds[i].sound, pitch);
   402→        }
   403→    }
   404→
   405→    // Update music
   406→    if (current_music && current_music->initialized) {
   407→        ma_sound_set_pitch(&current_music->sound, pitch);
   408→    }
   409→}
   410→
   411→// Web audio context unlock (browsers require user interaction before audio plays)
   412→#ifdef __EMSCRIPTEN__
   413→static void audio_try_unlock(void) {
   414→    if (audio_needs_unlock && audio_initialized) {
   415→        ma_engine_start(&audio_engine);
   416→        audio_needs_unlock = false;
   417→        printf("Audio context unlocked\n");
   418→    }
   419→}
... [7 more lines]

Now let me add the unlock call to the event handling code. I'll add it for keyboard, mouse, and touch events.

Read (E:\a327ex\Anchor\engine\src\anchor.c)

3470→
  3471→    // Accumulate render lag, capped to prevent unbounded growth
  3472→    render_lag += dt;
  3473→    if (render_lag > RENDER_RATE * 2) {
  3474→        render_lag = RENDER_RATE * 2;
  3475→    }
  3476→
  3477→    // Process events every frame (not tied to fixed timestep)
  3478→    SDL_Event event;
  3479→    while (SDL_PollEvent(&event)) {
  3480→        if (event.type == SDL_QUIT) {
  3481→            running = false;
  3482→        }
  3483→        // Track keyboard state
  3484→        if (event.type == SDL_KEYDOWN && !event.key.repeat) {
  3485→            last_input_type = INPUT_TYPE_KEYBOARD;
  3486→            SDL_Scancode sc = event.key.keysym.scancode;
  3487→            if (sc < SDL_NUM_SCANCODES) {
  3488→                keys_current[sc] = true;
  3489→            }
  3490→            // Capture mode: capture the key
  3491→            if (capture_mode && captured_control[0] == '\0') {
  3492→                const char* key_name = scancode_to_key_name(sc);
  3493→                if (key_name) {
  3494→                    snprintf(captured_control, sizeof(captured_control), "key:%s", key_name);
  3495→                }
  3496→            }
  3497→            // Built-in key handling (skip if in capture mode)
  3498→            if (!capture_mode) {
  3499→                if (event.key.keysym.sym == SDLK_ESCAPE) {
... [30 more lines]

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3479→    while (SDL_PollEvent(&event)) {
  3480→        if (event.type == SDL_QUIT) {
  3481→            running = false;
  3482→        }
  3483→        // Track keyboard state
  3484→        if (event.type == SDL_KEYDOWN && !event.key.repeat) {
  3485→            last_input_type = INPUT_TYPE_KEYBOARD;
  3486→            #ifdef __EMSCRIPTEN__
  3487→            audio_try_unlock();
  3488→            #endif
  3489→            SDL_Scancode sc = event.key.keysym.scancode;
  3490→            if (sc < SDL_NUM_SCANCODES) {
  3491→                keys_current[sc] = true;
  3492→            }
  3493→            // Capture mode: capture the key

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3525→            mouse_y = event.motion.y;
  3526→            mouse_dx += event.motion.xrel;
  3527→            mouse_dy += event.motion.yrel;
  3528→        }
  3529→        // Track mouse buttons
  3530→        if (event.type == SDL_MOUSEBUTTONDOWN) {
  3531→            last_input_type = INPUT_TYPE_MOUSE;
  3532→            #ifdef __EMSCRIPTEN__
  3533→            audio_try_unlock();
  3534→            #endif
  3535→            int btn = event.button.button - 1;  // SDL buttons are 1-indexed
  3536→            if (btn >= 0 && btn < MAX_MOUSE_BUTTONS) {
  3537→                mouse_buttons_current[btn] = true;
  3538→            }
  3539→            // Capture mode: capture the mouse button

Let me check if there's touch event handling and add unlock there too.

Grep (SDL_FINGERDOWN|SDL_FINGER)

No matches found

Read (E:\a327ex\Anchor\engine\src\anchor.c)

3535→            int btn = event.button.button - 1;  // SDL buttons are 1-indexed
  3536→            if (btn >= 0 && btn < MAX_MOUSE_BUTTONS) {
  3537→                mouse_buttons_current[btn] = true;
  3538→            }
  3539→            // Capture mode: capture the mouse button
  3540→            if (capture_mode && captured_control[0] == '\0') {
  3541→                snprintf(captured_control, sizeof(captured_control), "mouse:%d", event.button.button);
  3542→            }
  3543→        }
  3544→        if (event.type == SDL_MOUSEBUTTONUP) {
  3545→            int btn = event.button.button - 1;
  3546→            if (btn >= 0 && btn < MAX_MOUSE_BUTTONS) {
  3547→                mouse_buttons_current[btn] = false;
  3548→            }
  3549→        }
  3550→        // Track mouse wheel
  3551→        if (event.type == SDL_MOUSEWHEEL) {
  3552→            mouse_wheel_x += event.wheel.x;
  3553→            mouse_wheel_y += event.wheel.y;
  3554→        }
  3555→        // Handle window focus events - resync timing to prevent catch-up stutter
  3556→        if (event.type == SDL_WINDOWEVENT) {
  3557→            if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
  3558→                timing_resync();
  3559→            }
  3560→        }
  3561→        // Gamepad hotplug handling
  3562→        if (event.type == SDL_CONTROLLERDEVICEADDED) {
  3563→            if (!gamepad) {
  3564→                gamepad = SDL_GameControllerOpen(event.cdevice.which);

Edit (E:\a327ex\Anchor\engine\src\anchor.c)

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:
  3546→            if (btn >= 0 && btn < MAX_MOUSE_BUTTONS) {
  3547→                mouse_buttons_current[btn] = false;
  3548→            }
  3549→        }
  3550→        // Track mouse wheel
  3551→        if (event.type == SDL_MOUSEWHEEL) {
  3552→            mouse_wheel_x += event.wheel.x;
  3553→            mouse_wheel_y += event.wheel.y;
  3554→        }
  3555→        // Touch events (for web/mobile audio unlock)
  3556→        #ifdef __EMSCRIPTEN__
  3557→        if (event.type == SDL_FINGERDOWN) {
  3558→            audio_try_unlock();
  3559→        }
  3560→        #endif
  3561→        // Handle window focus events - resync timing to prevent catch-up stutter
  3562→        if (event.type == SDL_WINDOWEVENT) {
  3563→            if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
  3564→                timing_resync();
  3565→            }

Let me build for Windows first to verify compilation.

Bash (cd E:/a327ex/Anchor/engine && ./build.bat)

anchor.c
src/anchor.c(218): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(874): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(868): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(1260): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1538): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1544): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1654): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1663): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1757): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1759): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2404): 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

Windows builds. Now let me build for web.

Bash (cd E:/a327ex/Anchor/engine && ./build-web.sh ../test)

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
In file included from src/anchor.c:4023:
include\stb_vorbis.c:1404:75: warning: pointer comparison always evaluates to false [-Wtautological-compare]
 1404 |       if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {
      |                                                                           ^
1 warning generated.

Both builds succeeded. Now you can test the web build:

cd E:/a327ex/Anchor/engine/build-web && python -m http.server 8000

Then open http://localhost:8000/anchor.html in your browser. The audio context will unlock on first key press, mouse click, or touch.

Let me update the implementation plan.

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   925→**Step 11: Bug fix — number key scancodes**
   926→- [x] SDL scancodes for 1-9 are sequential, then 0 (keyboard layout order, not 0-9)
   927→- [x] Fixed `key_name_to_scancode` to handle this correctly
   928→
   929→**Step 12: Web audio context unlock**
   930→- [x] Handle browser requirement for user interaction before audio
   931→- [x] Unlock on first input event (key/mouse/touch)
   932→- [x] `audio_try_unlock()` called from SDL_KEYDOWN, SDL_MOUSEBUTTONDOWN, SDL_FINGERDOWN
   933→
   934→**Step 13: Verification**
   935→- [x] Test on Windows: sound effects with volume/pitch variation
   936→- [x] Test on Windows: music looping
   937→- [x] Test on Windows: slow-mo pitch effect
   938→- [x] Test on Windows: perceptual volume scaling (triangle wave oscillation test)
   939→- [ ] Test on Web: audio context unlocks on interaction
   940→- [ ] Test on Web: all features match Windows
   941→
   942→---
   943→
   944→### Lua API

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   977→- [x] Step 6-7: Music loads, plays, loops, stops
   978→- [x] Step 8: Music master volume works
   979→- [x] Step 9: Master pitch affects all playing audio in real-time
   980→- [x] Step 10: Perceptual volume scaling produces natural-feeling volume changes
   981→- [x] Step 11: Number keys 1-9 and 0 work correctly
   982→- [x] Step 12: Web audio context unlock implemented
   983→- [ ] Step 13: Web build tested and verified
   984→- [ ] All steps verified on Windows and Web
   985→
   986→**Deliverable:** Audio with pitch shifting, separate volume controls, and perceptual scaling.
   987→
   988→---

Done. Web audio context unlock is implemented.

To test: bash cd E:/a327ex/Anchor/engine/build-web && python -m http.server 8000

Then open http://localhost:8000/anchor.html - audio should unlock on first keypress, click, or touch.

Perfect, it works.

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   935→- [x] Test on Windows: sound effects with volume/pitch variation
   936→- [x] Test on Windows: music looping
   937→- [x] Test on Windows: slow-mo pitch effect
   938→- [x] Test on Windows: perceptual volume scaling (triangle wave oscillation test)
   939→- [x] Test on Web: audio context unlocks on interaction
   940→- [x] Test on Web: all features match Windows
   941→
   942→---
   943→
   944→### Lua API

Edit (E:\a327ex\Anchor\docs\ANCHOR_IMPLEMENTATION_PLAN.md)

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:
   978→- [x] Step 8: Music master volume works
   979→- [x] Step 9: Master pitch affects all playing audio in real-time
   980→- [x] Step 10: Perceptual volume scaling produces natural-feeling volume changes
   981→- [x] Step 11: Number keys 1-9 and 0 work correctly
   982→- [x] Step 12: Web audio context unlock implemented
   983→- [x] Step 13: Web build tested and verified
   984→- [x] All steps verified on Windows and Web
   985→
   986→**Deliverable:** Audio with pitch shifting, separate volume controls, and perceptual scaling. ✓ Complete
   987→
   988→---
   989→
   990→## Phase 7: Physics

Phase 6 Audio is complete.

Summary of what was implemented:

miniaudio + stb_vorbis for audio (OGG/Vorbis support)
Sound effects: sound_load, sound_play(sound, volume, pitch), sound_set_volume
Music: music_load, music_play(music, loop), music_stop, music_set_volume
Master pitch: audio_set_master_pitch for slow-mo effects
Perceptual volume scaling (linear² curve) for natural-feeling sliders
Sound instance pool (64 slots) with main-thread cleanup
Web audio context unlock on first user interaction

Next up is Phase 7: Physics (Box2D).

You may end the session. Read the whole log, title it "Anchor Phase 6"

Read (E:\a327ex\Anchor\docs\SESSION_WORKFLOW.md)

1→# Session Workflow
     2→
     3→When the user asks to end the session, follow this workflow. Complete all steps before committing (one commit per session).
     4→
     5→See the Commands section in `.claude/CLAUDE.md` for quick reference.
     6→
     7→---
     8→
     9→## End of Session Steps
    10→
    11→1. **Locate the session transcript** — find the most recent JSONL file
    12→2. **Convert to Markdown** — use a lowercase, hyphenated title slug (e.g., `engine-phase-1.md`). Date-based filenames don't work with Blot.
    13→3. **Read the converted log** to review the full session, especially if compacted. Summary must cover everything.
    14→4. **Write a detailed summary:**
    15→   - Chronological order (matching conversation flow)
    16→   - Weight to one-off fixes, attempts, problems solved
    17→   - Specific details: error messages, what was tried, what worked
    18→5. **Create a short title** (max 30 characters)
    19→6. **Show title + summary to user** — wait for approval before proceeding
    20→7. **Prepend title + summary** to the log file (replace default header)
    21→8. **Sync context files**
    22→9. **Commit** with title as subject, full summary as body:
    23→
    24→   **CRITICAL:** Copy summary text directly from the log file. Do not retype. The commit body must be character-for-character identical to the log file.
    25→
    26→   ```bash
    27→   git commit -m "Title
    28→
    29→   [COPY-PASTE exact summary from log file]
    30→
... [89 more lines]

Bash (ls -t ~/.claude/projects/E--a327ex-Anchor/*.jsonl | grep -v agent | head -1)

/c/Users/adn/.claude/projects/E--a327ex-Anchor/e6b9daa6-dbfa-495a-b36a-909fac1f31f0.jsonl