mirror of https://github.com/bsnes-emu/bsnes.git
94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
#include <gba/gba.hpp>
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namespace GameBoyAdvance {
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#include "io.cpp"
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#include "square.cpp"
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#include "square1.cpp"
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#include "square2.cpp"
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#include "wave.cpp"
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#include "noise.cpp"
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#include "sequencer.cpp"
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#include "fifo.cpp"
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#include "serialization.cpp"
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APU apu;
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auto APU::Enter() -> void {
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while(true) scheduler.synchronize(), apu.main();
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}
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auto APU::main() -> void {
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for(auto n : range(64)) {
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runsequencer();
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}
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int lsample = regs.bias.level - 0x0200;
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int rsample = regs.bias.level - 0x0200;
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//(4-bit x 4 -> 6-bit) + 3-bit volume = 9-bit output
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if(sequencer.masterenable) {
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int lsequence = 0;
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if(sequencer.lenable[0]) lsequence += square1.output;
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if(sequencer.lenable[1]) lsequence += square2.output;
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if(sequencer.lenable[2]) lsequence += wave.output;
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if(sequencer.lenable[3]) lsequence += noise.output;
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int rsequence = 0;
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if(sequencer.renable[0]) rsequence += square1.output;
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if(sequencer.renable[1]) rsequence += square2.output;
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if(sequencer.renable[2]) rsequence += wave.output;
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if(sequencer.renable[3]) rsequence += noise.output;
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if(sequencer.volume < 3) {
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lsample += lsequence * (sequencer.lvolume + 1) >> (2 - sequencer.volume);
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rsample += rsequence * (sequencer.rvolume + 1) >> (2 - sequencer.volume);
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}
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}
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//(8-bit x 2 -> 7-bit) + 1-bit volume = 10-bit output
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int fifo0 = fifo[0].output + (1 << fifo[0].volume);
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int fifo1 = fifo[1].output + (1 << fifo[1].volume);
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if(fifo[0].lenable) lsample += fifo0;
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if(fifo[1].lenable) lsample += fifo1;
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if(fifo[0].renable) rsample += fifo0;
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if(fifo[1].renable) rsample += fifo1;
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lsample = sclamp<10>(lsample);
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rsample = sclamp<10>(rsample);
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if(regs.bias.amplitude == 1) lsample &= ~3, rsample &= ~3;
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if(regs.bias.amplitude == 2) lsample &= ~7, rsample &= ~7;
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if(regs.bias.amplitude == 3) lsample &= ~15, rsample &= ~15;
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if(cpu.regs.mode == CPU::Registers::Mode::Stop) lsample = 0, rsample = 0;
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stream->sample(sclamp<16>(lsample << 6) / 32768.0, sclamp<16>(rsample << 6) / 32768.0); //should be <<5; use <<6 for added volume
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step(512);
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}
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auto APU::step(uint clocks) -> void {
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Thread::step(clocks);
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synchronize(cpu);
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}
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auto APU::power() -> void {
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create(APU::Enter, 16'777'216);
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stream = Emulator::audio.createStream(2, 16'777'216.0 / 512.0);
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square1.power();
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square2.power();
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wave.power();
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noise.power();
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sequencer.power();
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fifo[0].power();
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fifo[1].power();
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regs.bias.amplitude = 0;
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regs.bias.level = 0x200;
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for(uint n = 0x060; n <= 0x0a7; n++) bus.io[n] = this;
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}
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}
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