fix(audio): guard FP environment at all audio entry points#226
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Audio code invoked from the main thread (miniaudio, OpenAL, video audio streaming) can leave the FP environment in a state that skews game math on macOS/ARM - observed as wrong-tile mouse picks (#215) and music affecting physics calculations on non-x86 platforms. init(), update() and addAudioEvent() were already guarded; extend ScopedFPUGuard to the remaining public entry points of MiniAudioManager, OpenALAudioManager and MiniAudioStream so the engine FP mode is re-asserted whenever audio work returns to game code mid-frame.
This was referenced Jul 20, 2026
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Follow-up to #222 for the audio side.
Audio code called from the main thread can leave the FP environment in a bad state on macOS/ARM. We've seen this as wrong mouse picks (#215) and as music affecting physics on non-x86.
init(), update() and addAudioEvent() already had ScopedFPUGuard, but the other entry points didn't. This adds the guard to all of them in MiniAudioManager (which macOS actually uses), OpenALAudioManager (including selectProvider and friend_forcePlayAudioEventRTS), and MiniAudioStream for video audio. readPCM/seekPCM run on the mixer thread, so I left those alone.
Mechanical change, 44 guard insertions and one include.
FPU state is per-thread, so fixing the mixer thread wouldn't help. The problem has to come from audio work running on the main thread, and guarding every entry point closes that window wherever it happens.
I don't have the Vulkan SDK on this machine, so relying on CI for the build. I boot-tested the #222 artifact and confirmed macOS uses the MiniAudio backend.
Two separate follow-ups remain: music decodes whole tracks synchronously on the main thread (causes the gaps at track changes), and there are still unguarded pick paths on the view side, as discussed in #222.
AI disclosure per CONTRIBUTING: written with AI assistance (Claude), reviewed by me.