mirror of https://github.com/bsnes-emu/bsnes.git
59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
void APU::Triangle::clock_length() {
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if(halt_length_counter == 0) {
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if(length_counter > 0) length_counter--;
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}
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}
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void APU::Triangle::clock_linear_length() {
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if(reload_linear) {
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linear_length_counter = linear_length;
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} else if(linear_length_counter) {
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linear_length_counter--;
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}
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if(halt_length_counter == 0) reload_linear = false;
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}
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uint8 APU::Triangle::clock() {
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uint8 result = step_counter & 0x0f;
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if((step_counter & 0x10) == 0) result ^= 0x0f;
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if(length_counter == 0 || linear_length_counter == 0) return result;
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if(--period_counter == 0) {
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step_counter++;
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period_counter = period + 1;
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}
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return result;
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}
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void APU::Triangle::power() {
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reset();
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}
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void APU::Triangle::reset() {
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length_counter = 0;
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linear_length = 0;
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halt_length_counter = 0;
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period = 0;
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period_counter = 1;
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step_counter = 0;
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linear_length_counter = 0;
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reload_linear = 0;
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}
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void APU::Triangle::serialize(serializer& s) {
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s.integer(length_counter);
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s.integer(linear_length);
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s.integer(halt_length_counter);
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s.integer(period);
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s.integer(period_counter);
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s.integer(step_counter);
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s.integer(linear_length_counter);
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s.integer(reload_linear);
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}
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