mirror of https://github.com/bsnes-emu/bsnes.git
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
#include <ms/ms.hpp>
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namespace MasterSystem {
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PSG psg;
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#include "io.cpp"
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#include "tone.cpp"
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#include "noise.cpp"
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#include "serialization.cpp"
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auto PSG::Enter() -> void {
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while(true) scheduler.synchronize(), psg.main();
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}
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auto PSG::main() -> void {
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tone0.run();
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tone1.run();
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tone2.run();
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noise.run();
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int left = 0;
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if(tone0.output && tone0.left) left += levels[tone0.volume];
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if(tone1.output && tone1.left) left += levels[tone1.volume];
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if(tone2.output && tone2.left) left += levels[tone2.volume];
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if(noise.output && noise.left) left += levels[noise.volume];
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lowpassLeft += (left - lowpassLeft) * 20 / 256;
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left = left * 2 / 6 + lowpassLeft * 3 / 4;
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left = sclamp<16>(left - 32768);
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int right = 0;
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if(tone0.output && tone0.right) right += levels[tone0.volume];
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if(tone1.output && tone1.right) right += levels[tone1.volume];
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if(tone2.output && tone2.right) right += levels[tone2.volume];
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if(noise.output && noise.right) right += levels[noise.volume];
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lowpassRight += (right - lowpassRight) * 20 / 256;
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right = right * 2 / 6 + lowpassRight * 3 / 4;
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right = sclamp<16>(right - 32768);
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stream->sample(left / 32768.0, right / 32768.0);
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step(1);
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}
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auto PSG::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 PSG::power() -> void {
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//Master System is monaural; Game Gear is stereo
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//use stereo mode for both; output same sample to both channels for Master System
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create(PSG::Enter, system.colorburst() / 16.0);
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stream = Emulator::audio.createStream(2, frequency());
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select = 0;
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lowpassLeft = 0;
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lowpassRight = 0;
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for(auto n : range(15)) {
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levels[n] = 0x2000 * pow(2, n * -2.0 / 6.0) + 0.5;
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}
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levels[15] = 0;
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tone0.power();
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tone1.power();
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tone2.power();
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noise.power();
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}
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}
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