62 lines
945 B
C++
62 lines
945 B
C++
#pragma once
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#include "stdafx.h"
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#include "ApuLengthCounter.h"
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class ApuEnvelope : public ApuLengthCounter
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{
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private:
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bool _constantVolume = false;
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uint8_t _volume = 0;
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uint8_t _envelope = 0;
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uint8_t _envelopeCounter = 0;
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bool _start = false;
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int8_t _divider = 0;
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uint8_t _counter = 0;
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protected:
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void InitializeEnvelope(uint8_t regValue)
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{
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_constantVolume = (regValue & 0x10) == 0x10;
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_volume = regValue & 0x0F;
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}
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void ResetEnvelope()
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{
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_start = true;
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}
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uint32_t GetVolume()
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{
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if(_lengthCounter > 0) {
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if(_constantVolume) {
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return _volume;
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} else {
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return _counter;
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}
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} else {
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return 0;
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}
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}
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public:
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void TickEnvelope()
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{
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if(!_start) {
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_divider--;
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if(_divider < 0) {
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_divider = _volume;
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if(_counter > 0) {
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_counter--;
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} else if(_lengthCounterHalt) {
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_counter = 15;
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}
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}
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} else {
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_start = false;
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_counter = 15;
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_divider = _volume;
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}
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}
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};
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