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Takes a stab at next_sequence_point.
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@ -10,6 +10,7 @@
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#include <cassert>
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#include <cstdio>
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#include <numeric>
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// TODO: is it safe not to check for back-pressure in pending_stores_?
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@ -174,11 +175,28 @@ uint8_t GLU::get_address_high() {
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// MARK: - Update logic.
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Cycles GLU::get_next_sequence_point() const {
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uint32_t result = std::numeric_limits<decltype(result)>::max();
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for(int c = 0; c < local_.oscillator_count; c++) {
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// Don't do anything for halted oscillators, or for oscillators that can't hit stops.
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if((local_.oscillators[c].control&3) != 2) {
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continue;
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}
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// Determine how many cycles until a stop is hit and update the pending result
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// if this is the new soonest-to-expire oscillator.
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const auto first_overflow_value = (local_.oscillators[c].overflow_mask - 1) << 1;
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const auto time_until_stop = (first_overflow_value - local_.oscillators[c].position + local_.oscillators[c].velocity - 1) / local_.oscillators[c].velocity;
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result = std::min(result, time_until_stop);
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}
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return Cycles(result);
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}
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void GLU::skip_audio(EnsoniqState &state, size_t number_of_samples) {
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// Just advance all oscillator pointers and check for interrupts.
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// If a read occurs to the current-output level, generate it then.
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for(int c = 0; c < local_.oscillator_count; c++) {
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for(int c = 0; c < state.oscillator_count; c++) {
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// Don't do anything for halted oscillators.
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if(state.oscillators[c].control&1) continue;
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@ -186,7 +204,7 @@ void GLU::skip_audio(EnsoniqState &state, size_t number_of_samples) {
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state.oscillators[c].position += state.oscillators[c].velocity * number_of_samples;
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// Check for stops, and any interrupts that therefore flow.
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if((state.oscillators[c].control & 1) && (state.oscillators[c].position & state.oscillators[c].overflow_mask)) {
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if((state.oscillators[c].control & 2) && (state.oscillators[c].position & state.oscillators[c].overflow_mask)) {
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// Apply halt, set interrupt request flag.
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state.oscillators[c].position = 0;
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state.oscillators[c].control |= 1;
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@ -33,6 +33,7 @@ class GLU: public Outputs::Speaker::SampleSource {
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uint8_t get_address_high();
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void run_for(Cycles);
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Cycles get_next_sequence_point() const;
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// SampleSource.
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void get_samples(std::size_t number_of_samples, std::int16_t *target);
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