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SPU: Fix pitch modulation

This commit is contained in:
Connor McLaughlin 2020-04-24 15:50:32 +10:00
parent 1891b45b0e
commit e34b78ab80
1 changed files with 3 additions and 2 deletions
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5
src/core/spu.cpp
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@ -1443,8 +1443,9 @@ std::tuple<s32, s32> SPU::SampleVoice(u32 voice_index)
u16 step = voice.regs.adpcm_sample_rate;
if (IsPitchModulationEnabled(voice_index))
{
const u32 factor = u32(std::clamp<s32>(m_voices[voice_index - 1].last_volume, -0x8000, 0x7FFF) + 0x8000);
step = Truncate16(step * factor) >> 15;
const s32 factor = std::clamp<s32>(m_voices[voice_index - 1].last_volume, -0x8000, 0x7FFF) + 0x8000;
const u16 old_step = step;
step = Truncate16(static_cast<u32>((SignExtend32(step) * factor) >> 15));
}
step = std::min<u16>(step, 0x4000);