mirror of https://github.com/bsnes-emu/bsnes.git
66 lines
1.1 KiB
C++
66 lines
1.1 KiB
C++
auto PSG::write(uint8 data) -> void {
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bool l = data.bit(7);
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if(l) select = data.bits(4,6);
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switch(select) {
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case 0: {
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if(l) tone0.pitch.bits(0,3) = data.bits(0,3);
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else tone0.pitch.bits(4,9) = data.bits(0,5);
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break;
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}
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case 1: {
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tone0.volume = data.bits(0,3);
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break;
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}
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case 2: {
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if(l) tone1.pitch.bits(0,3) = data.bits(0,3);
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else tone1.pitch.bits(4,9) = data.bits(0,5);
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break;
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}
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case 3: {
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tone1.volume = data.bits(0,3);
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break;
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}
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case 4: {
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if(l) tone2.pitch.bits(0,3) = data.bits(0,3);
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else tone2.pitch.bits(4,9) = data.bits(0,5);
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break;
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}
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case 5: {
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tone2.volume = data.bits(0,3);
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break;
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}
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case 6: {
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noise.rate = data.bits(0,1);
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noise.enable = data.bit(2);
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noise.lfsr = 0x8000;
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break;
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}
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case 7: {
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noise.volume = data.bits(0,3);
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break;
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}
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}
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}
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//Game Gear only
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auto PSG::balance(uint8 data) -> void {
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tone0.right = data.bit(0);
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tone1.right = data.bit(1);
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tone2.right = data.bit(2);
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noise.right = data.bit(3);
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tone0.left = data.bit(4);
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tone1.left = data.bit(5);
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tone2.left = data.bit(6);
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noise.left = data.bit(7);
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}
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