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https://github.com/zoriya/ComSquare.git
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b0fb1e3351
starting to working of voices and so on BRR, Envelopes, Gauss and Timers as they use each others
78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
//
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// Created by melefo on 2/3/21.
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//
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#include "DSP.hpp"
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namespace ComSquare::APU::DSP
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{
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void DSP::runEnvelope(Voice &voice)
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{
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int32_t envelope = voice.envelope;
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if (voice.envelopeMode == Envelope::Release) {
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envelope -= 0x08;
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if (envelope < 0)
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envelope = 0;
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voice.envelope = envelope;
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return;
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}
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int32_t rate;
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int32_t mode;
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int32_t data = voice.adsr2;
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if (this->_latch.adsr1 & 0b10000000) {
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if (voice.envelopeMode >= Envelope::Decay) {
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envelope -= 1;
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envelope -= envelope >> 8;
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rate = data & 0b11111;
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if (voice.envelopeMode == Envelope::Decay)
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rate = ((this->_latch.adsr1 >> 3) & 0x0E) + 0x10;
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}
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else {
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rate = ((this->_latch.adsr1 & 0b1111) << 1) + 1;
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if (rate < 0b11111)
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envelope += 0x20;
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else
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envelope += 0x400;
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}
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}
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else {
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data = voice.gain;
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mode = data >> 5;
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if (mode < 4) {
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envelope = data << 4;
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rate = 0b11111;
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}
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else {
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rate = data & 0b11111;
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if (mode == 4)
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envelope -= 0x20;
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else if (mode < 6) {
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envelope -= 1;
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envelope -= envelope >> 8;
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}
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else {
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envelope += 0x20;
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if (mode > 6 && voice.hiddenEnvelope >= 0x600)
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envelope += 0x08 - 0x20;
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}
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}
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}
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if (envelope >> 8 == (data >> 5) && voice.envelopeMode == Envelope::Decay)
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voice.envelopeMode = Envelope::Sustain;
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voice.hiddenEnvelope = envelope;
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if (static_cast<uint32_t>(envelope) > 0x7FF) {
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if (envelope < 0)
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envelope = 0;
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else
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envelope = 0x7FF;
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if (voice.envelopeMode == Envelope::Attack)
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voice.envelopeMode = Envelope::Decay;
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}
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if (this->timerPoll(rate))
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voice.envelope = envelope;
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}
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} |