SPU: Float-less volume application
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@ -9,23 +9,6 @@
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#include <imgui.h>
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Log_SetChannel(SPU);
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static s16 Clamp16(s32 value)
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{
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return static_cast<s16>(std::clamp<s32>(value, -32768, 32767));
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}
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static constexpr float S16ToFloat(s16 value)
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{
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return (value >= 0) ? (static_cast<float>(value) / static_cast<float>(std::numeric_limits<s16>::max())) :
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(static_cast<float>(value) / -static_cast<float>(std::numeric_limits<s16>::min()));
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}
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static constexpr s16 FloatToS16(float value)
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{
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return (value >= 0.0f) ? (static_cast<s16>(value * static_cast<float>(std::numeric_limits<s16>::max()))) :
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(static_cast<s16>(value * -static_cast<float>(std::numeric_limits<s16>::min())));
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}
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SPU::SPU() = default;
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SPU::~SPU() = default;
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@ -754,11 +737,11 @@ void SPU::ReadADPCMBlock(u16 address, ADPCMBlock* block)
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}
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}
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std::tuple<SPU::SampleFormat, SPU::SampleFormat> SPU::SampleVoice(u32 voice_index)
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std::tuple<s32, s32> SPU::SampleVoice(u32 voice_index)
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{
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Voice& voice = m_voices[voice_index];
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if (!voice.IsOn())
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return std::make_tuple<s16, s16>(0, 0);
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return {};
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if (!voice.has_samples)
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{
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@ -806,24 +789,14 @@ std::tuple<SPU::SampleFormat, SPU::SampleFormat> SPU::SampleVoice(u32 voice_inde
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}
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}
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// TODO: Volume
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const float adsr_volume = S16ToFloat(voice.regs.adsr_volume);
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// interpolate/sample and apply ADSR volume
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const s32 sample = ApplyVolumeUnsaturated(voice.Interpolate(), voice.regs.adsr_volume);
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voice.TickADSR();
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const s32 sample = voice.Interpolate();
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// s32 sample = voice.SampleBlock(voice.counter.sample_index);
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const s16 sample16 = Clamp16(sample);
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const float samplef = S16ToFloat(sample16) * adsr_volume;
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// apply volume
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const float volume_left = S16ToFloat(voice.regs.volume_left.GetVolume());
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const float volume_right = S16ToFloat(voice.regs.volume_right.GetVolume());
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const float final_left = volume_left * samplef;
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const float final_right = volume_right * samplef;
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return std::make_tuple(FloatToS16(final_left), FloatToS16(final_right));
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// return std::make_tuple(FloatToS16(samplef), FloatToS16(samplef));
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// return std::make_tuple(sample16, sample16);
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// apply per-channel volume
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const s16 left = ApplyVolumeUnsaturated(sample, voice.regs.volume_left.GetVolume());
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const s16 right = ApplyVolumeUnsaturated(sample, voice.regs.volume_right.GetVolume());
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return std::make_tuple(left, right);
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}
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void SPU::EnsureCDAudioSpace(u32 num_samples)
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@ -251,6 +251,14 @@ private:
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void TickADSR();
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};
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static constexpr s16 Clamp16(s32 value)
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{
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return (value < -0x8000) ? -0x8000 : (value > 0x7FFF) ? 0x7FFF : static_cast<s16>(value);
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}
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static constexpr s16 ApplyVolume(s16 sample, s16 volume) { return Clamp16((s32(sample) * s32(volume)) >> 15); }
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static constexpr s32 ApplyVolumeUnsaturated(s32 sample, s16 volume) { return (sample * s32(volume)) >> 15; }
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static ADSRPhase GetNextADSRPhase(ADSRPhase phase);
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u16 ReadVoiceRegister(u32 offset);
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@ -261,7 +269,7 @@ private:
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void RAMTransferWrite(u16 value);
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void ReadADPCMBlock(u16 address, ADPCMBlock* block);
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std::tuple<SampleFormat, SampleFormat> SampleVoice(u32 voice_index);
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std::tuple<s32, s32> SampleVoice(u32 voice_index);
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void GenerateSample();
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System* m_system = nullptr;
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