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emscripten: Fixes for data addresses above 2gb

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This includes both wasm64 and wasm32 when addressing more than 2gb of memory.

Fixes: #9052

(Manually cherry-picked from 3deb07ea395373204462130c1e062bc1f71fe060.)
This commit is contained in:
Ryan C. Gordon
2024-10-08 17:41:18 -04:00
parent c34790f9f1
commit 02434cd293
4 changed files with 12 additions and 5 deletions
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9
src/audio/emscripten/SDL_emscriptenaudio.c
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@@ -40,6 +40,13 @@ static bool EMSCRIPTENAUDIO_PlayDevice(SDL_AudioDevice *device, const Uint8 *buf
{
const int framelen = SDL_AUDIO_FRAMESIZE(device->spec);
MAIN_THREAD_EM_ASM({
/* Convert incoming buf pointer to a HEAPF32 offset. */
#ifdef __wasm64__
var buf = $0 / 4;
#else
var buf = $0 >>> 2;
#endif
var SDL3 = Module['SDL3'];
var numChannels = SDL3.audio_playback.currentPlaybackBuffer['numberOfChannels'];
for (var c = 0; c < numChannels; ++c) {
@@ -49,7 +56,7 @@ static bool EMSCRIPTENAUDIO_PlayDevice(SDL_AudioDevice *device, const Uint8 *buf
}
for (var j = 0; j < $1; ++j) {
channelData[j] = HEAPF32[$0 + ((j*numChannels + c) << 2) >> 2]; // !!! FIXME: why are these shifts here?
channelData[j] = HEAPF32[buf + (j*numChannels + c)];
}
}
}, buffer, buffer_size / framelen);