mirror of
https://github.com/italicsjenga/agb.git
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258 lines
6.6 KiB
C
258 lines
6.6 KiB
C
/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GB_AUDIO_H
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#define GB_AUDIO_H
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#include <mgba-util/common.h>
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CXX_GUARD_START
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#include <mgba/core/timing.h>
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DECL_BITFIELD(GBAudioRegisterDuty, uint8_t);
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DECL_BITS(GBAudioRegisterDuty, Length, 0, 6);
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DECL_BITS(GBAudioRegisterDuty, Duty, 6, 2);
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DECL_BITFIELD(GBAudioRegisterSweep, uint8_t);
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DECL_BITS(GBAudioRegisterSweep, StepTime, 0, 3);
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DECL_BIT(GBAudioRegisterSweep, Direction, 3);
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DECL_BITS(GBAudioRegisterSweep, InitialVolume, 4, 4);
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DECL_BITFIELD(GBAudioRegisterControl, uint16_t);
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DECL_BITS(GBAudioRegisterControl, Rate, 0, 11);
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DECL_BITS(GBAudioRegisterControl, Frequency, 0, 11);
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DECL_BIT(GBAudioRegisterControl, Stop, 14);
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DECL_BIT(GBAudioRegisterControl, Restart, 15);
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DECL_BITFIELD(GBAudioRegisterSquareSweep, uint8_t);
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DECL_BITS(GBAudioRegisterSquareSweep, Shift, 0, 3);
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DECL_BIT(GBAudioRegisterSquareSweep, Direction, 3);
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DECL_BITS(GBAudioRegisterSquareSweep, Time, 4, 3);
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DECL_BITFIELD(GBAudioRegisterBank, uint8_t);
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DECL_BIT(GBAudioRegisterBank, Size, 5);
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DECL_BIT(GBAudioRegisterBank, Bank, 6);
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DECL_BIT(GBAudioRegisterBank, Enable, 7);
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DECL_BITFIELD(GBAudioRegisterBankVolume, uint8_t);
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DECL_BITS(GBAudioRegisterBankVolume, VolumeGB, 5, 2);
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DECL_BITS(GBAudioRegisterBankVolume, VolumeGBA, 5, 3);
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DECL_BITFIELD(GBAudioRegisterNoiseFeedback, uint8_t);
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DECL_BITS(GBAudioRegisterNoiseFeedback, Ratio, 0, 3);
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DECL_BIT(GBAudioRegisterNoiseFeedback, Power, 3);
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DECL_BITS(GBAudioRegisterNoiseFeedback, Frequency, 4, 4);
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DECL_BITFIELD(GBAudioRegisterNoiseControl, uint8_t);
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DECL_BIT(GBAudioRegisterNoiseControl, Stop, 6);
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DECL_BIT(GBAudioRegisterNoiseControl, Restart, 7);
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DECL_BITFIELD(GBRegisterNR50, uint8_t);
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DECL_BITS(GBRegisterNR50, VolumeRight, 0, 3);
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DECL_BITS(GBRegisterNR50, VolumeLeft, 4, 3);
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DECL_BITFIELD(GBRegisterNR51, uint8_t);
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DECL_BIT(GBRegisterNR51, Ch1Right, 0);
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DECL_BIT(GBRegisterNR51, Ch2Right, 1);
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DECL_BIT(GBRegisterNR51, Ch3Right, 2);
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DECL_BIT(GBRegisterNR51, Ch4Right, 3);
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DECL_BIT(GBRegisterNR51, Ch1Left, 4);
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DECL_BIT(GBRegisterNR51, Ch2Left, 5);
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DECL_BIT(GBRegisterNR51, Ch3Left, 6);
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DECL_BIT(GBRegisterNR51, Ch4Left, 7);
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DECL_BITFIELD(GBAudioEnable, uint8_t);
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DECL_BIT(GBAudioEnable, PlayingCh1, 0);
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DECL_BIT(GBAudioEnable, PlayingCh2, 1);
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DECL_BIT(GBAudioEnable, PlayingCh3, 2);
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DECL_BIT(GBAudioEnable, PlayingCh4, 3);
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DECL_BIT(GBAudioEnable, Enable, 7);
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struct GB;
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struct GBAudioEnvelope {
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int length;
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int duty;
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int stepTime;
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int initialVolume;
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int currentVolume;
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bool direction;
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int dead;
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int nextStep;
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};
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struct GBAudioSquareControl {
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int frequency;
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int length;
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bool stop;
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int hi;
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};
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struct GBAudioSweep {
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int shift;
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int time;
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int step;
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bool direction;
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bool enable;
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bool occurred;
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int realFrequency;
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};
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struct GBAudioSquareChannel {
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struct GBAudioSweep sweep;
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struct GBAudioEnvelope envelope;
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struct GBAudioSquareControl control;
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int8_t sample;
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};
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struct GBAudioWaveChannel {
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bool size;
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bool bank;
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bool enable;
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unsigned length;
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int volume;
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int rate;
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bool stop;
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int window;
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bool readable;
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union {
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uint32_t wavedata32[8];
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uint8_t wavedata8[16];
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};
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int8_t sample;
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};
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struct GBAudioNoiseChannel {
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struct GBAudioEnvelope envelope;
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int ratio;
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int frequency;
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bool power;
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bool stop;
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int length;
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uint32_t lfsr;
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int nSamples;
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int samples;
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uint32_t lastEvent;
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int8_t sample;
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};
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enum GBAudioStyle {
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GB_AUDIO_DMG,
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GB_AUDIO_MGB = GB_AUDIO_DMG, // TODO
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GB_AUDIO_CGB,
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GB_AUDIO_AGB, // GB in GBA
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GB_AUDIO_GBA, // GBA PSG
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};
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struct GBAudio {
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struct GB* p;
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struct mTiming* timing;
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unsigned timingFactor;
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struct GBAudioSquareChannel ch1;
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struct GBAudioSquareChannel ch2;
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struct GBAudioWaveChannel ch3;
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struct GBAudioNoiseChannel ch4;
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struct blip_t* left;
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struct blip_t* right;
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int16_t lastLeft;
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int16_t lastRight;
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int32_t capLeft;
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int32_t capRight;
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int clock;
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int32_t clockRate;
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uint8_t volumeRight;
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uint8_t volumeLeft;
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bool ch1Right;
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bool ch2Right;
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bool ch3Right;
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bool ch4Right;
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bool ch1Left;
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bool ch2Left;
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bool ch3Left;
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bool ch4Left;
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bool playingCh1;
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bool playingCh2;
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bool playingCh3;
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bool playingCh4;
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uint8_t* nr52;
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int frame;
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bool skipFrame;
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int32_t sampleInterval;
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enum GBAudioStyle style;
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struct mTimingEvent frameEvent;
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struct mTimingEvent ch1Event;
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struct mTimingEvent ch2Event;
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struct mTimingEvent ch3Event;
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struct mTimingEvent ch3Fade;
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struct mTimingEvent ch4Event;
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struct mTimingEvent sampleEvent;
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bool enable;
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size_t samples;
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bool forceDisableCh[4];
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int masterVolume;
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};
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void GBAudioInit(struct GBAudio* audio, size_t samples, uint8_t* nr52, enum GBAudioStyle style);
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void GBAudioDeinit(struct GBAudio* audio);
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void GBAudioReset(struct GBAudio* audio);
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void GBAudioResizeBuffer(struct GBAudio* audio, size_t samples);
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void GBAudioWriteNR10(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR11(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR12(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR13(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR14(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR21(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR22(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR23(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR24(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR30(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR31(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR32(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR33(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR34(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR41(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR42(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR43(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR44(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR50(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR51(struct GBAudio* audio, uint8_t);
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void GBAudioWriteNR52(struct GBAudio* audio, uint8_t);
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void GBAudioUpdateFrame(struct GBAudio* audio);
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void GBAudioUpdateChannel4(struct GBAudio* audio);
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void GBAudioSamplePSG(struct GBAudio* audio, int16_t* left, int16_t* right);
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struct GBSerializedPSGState;
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void GBAudioPSGSerialize(const struct GBAudio* audio, struct GBSerializedPSGState* state, uint32_t* flagsOut);
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void GBAudioPSGDeserialize(struct GBAudio* audio, const struct GBSerializedPSGState* state, const uint32_t* flagsIn);
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struct GBSerializedState;
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void GBAudioSerialize(const struct GBAudio* audio, struct GBSerializedState* state);
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void GBAudioDeserialize(struct GBAudio* audio, const struct GBSerializedState* state);
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CXX_GUARD_END
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#endif
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