mirror of
https://github.com/bsnes-emu/bsnes.git
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78d49d3873
byuu says: Changelog: - int_t<bits> replaced with Integer<bits> - uint_t<bits> replaced with Natural<bits> - fixed "Synchronize Audio" menu option that broke recently - all of sfc/performance ported to "auto function() -> return;" syntax With this WIP, all of higan is finally ported over to the new function declaration syntax. Thank the gods. There's still going to be periodic disruption for diffs from porting over signed->int, unsigned->uint, and whatever we come up with for the new Natural<> and Integer<> classes. But the worst of it's behind us now.
104 lines
2.2 KiB
C++
104 lines
2.2 KiB
C++
auto APU::Noise::dac_enable() const -> bool {
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return (envelope_volume || envelope_direction);
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}
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auto APU::Noise::run() -> void {
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if(period && --period == 0) {
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period = divisor << frequency;
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if(frequency < 14) {
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bool bit = (lfsr ^ (lfsr >> 1)) & 1;
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lfsr = (lfsr >> 1) ^ (bit << (narrow_lfsr ? 6 : 14));
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}
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}
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uint4 sample = (lfsr & 1) ? (uint4)0 : volume;
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if(enable == false) sample = 0;
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output = sample;
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}
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auto APU::Noise::clock_length() -> void {
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if(enable && counter) {
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if(++length == 0) enable = false;
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}
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}
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auto APU::Noise::clock_envelope() -> void {
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if(enable && envelope_frequency && --envelope_period == 0) {
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envelope_period = envelope_frequency;
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if(envelope_direction == 0 && volume > 0) volume--;
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if(envelope_direction == 1 && volume < 15) volume++;
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}
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}
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auto APU::Noise::write(uint r, uint8 data) -> void {
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if(r == 1) { //$ff20 NR41
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length = data & 0x3f;
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}
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if(r == 2) { //$ff21 NR42
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envelope_volume = data >> 4;
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envelope_direction = data & 0x08;
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envelope_frequency = data & 0x07;
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if(dac_enable() == false) enable = false;
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}
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if(r == 3) { //$ff22 NR43
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frequency = data >> 4;
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narrow_lfsr = data & 0x08;
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divisor = (data & 0x07) << 3;
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if(divisor == 0) divisor = 4;
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period = divisor << frequency;
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}
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if(r == 4) { //$ff34 NR44
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bool initialize = data & 0x80;
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counter = data & 0x40;
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if(initialize) {
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enable = dac_enable();
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lfsr = -1;
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envelope_period = envelope_frequency;
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volume = envelope_volume;
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}
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}
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}
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auto APU::Noise::power() -> void {
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enable = 0;
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envelope_volume = 0;
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envelope_direction = 0;
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envelope_frequency = 0;
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frequency = 0;
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narrow_lfsr = 0;
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divisor = 0;
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counter = 0;
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output = 0;
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length = 0;
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envelope_period = 0;
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volume = 0;
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period = 0;
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lfsr = 0;
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}
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auto APU::Noise::serialize(serializer& s) -> void {
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s.integer(enable);
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s.integer(envelope_volume);
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s.integer(envelope_direction);
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s.integer(envelope_frequency);
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s.integer(frequency);
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s.integer(narrow_lfsr);
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s.integer(divisor);
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s.integer(counter);
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s.integer(output);
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s.integer(length);
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s.integer(envelope_period);
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s.integer(volume);
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s.integer(period);
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s.integer(lfsr);
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}
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