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Takes a run at the bus side of honouring Ensoniq sequence points.

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This commit is contained in:
Thomas Harte 2020-11-26 17:14:46 -05:00
parent 6808ad6f5d
commit f4d13d1f6f
1 changed files with 49 additions and 30 deletions
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79
Machines/Apple/AppleIIgs/AppleIIgs.cpp
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@ -141,8 +141,9 @@ class ConcreteMachine:
void flush() {
video_.flush();
update_audio();
iwm_.flush();
AudioUpdater updater(this);
audio_queue_.perform();
}
@ -395,38 +396,38 @@ class ConcreteMachine:
break;
// The audio GLU.
case Read(0xc03c):
update_audio();
case Read(0xc03c): {
AudioUpdater updater(this);
*value = sound_glu_.get_control();
break;
case Write(0xc03c):
update_audio();
} break;
case Write(0xc03c): {
AudioUpdater updater(this);
sound_glu_.set_control(*value);
break;
case Read(0xc03d):
update_audio();
} break;
case Read(0xc03d): {
AudioUpdater updater(this);
*value = sound_glu_.get_data();
break;
case Write(0xc03d):
update_audio();
} break;
case Write(0xc03d): {
AudioUpdater updater(this);
sound_glu_.set_data(*value);
break;
case Read(0xc03e):
update_audio();
} break;
case Read(0xc03e): {
AudioUpdater updater(this);
*value = sound_glu_.get_address_low();
break;
case Write(0xc03e):
update_audio();
} break;
case Write(0xc03e): {
AudioUpdater updater(this);
sound_glu_.set_address_low(*value);
break;
case Read(0xc03f):
update_audio();
} break;
case Read(0xc03f): {
AudioUpdater updater(this);
*value = sound_glu_.get_address_high();
break;
case Write(0xc03f):
update_audio();
} break;
case Write(0xc03f): {
AudioUpdater updater(this);
sound_glu_.set_address_high(*value);
break;
} break;
// These were all dealt with by the call to memory_.access.
@ -491,10 +492,10 @@ class ConcreteMachine:
card_mask_ = *value;
break;
case Read(0xc030): case Write(0xc030):
update_audio();
case Read(0xc030): case Write(0xc030): {
AudioUpdater updater(this);
audio_toggle_.set_output(!audio_toggle_.get_output());
break;
} break;
// Addresses that seemingly map to nothing; provided as a separate break out for now,
// while I have an assert on unknown accesses.
@ -724,6 +725,10 @@ class ConcreteMachine:
cycles_since_audio_update_ += duration;
total += decltype(total)(duration.as_integral());
if(cycles_since_audio_update_ >= cycles_until_audio_event_) {
AudioUpdater updater(this);
update_interrupts();
}
if(video_.did_flush()) {
update_interrupts();
}
@ -732,8 +737,9 @@ class ConcreteMachine:
}
void update_interrupts() {
// Update the interrupt line. TODO: should include the sound GLU too.
m65816_.set_irq_line(video_.last_valid()->get_interrupt_register() & 0x80);
// Update the interrupt line.
// TODO: are there other interrupt sources?
m65816_.set_irq_line((video_.last_valid()->get_interrupt_register() & 0x80) || sound_glu_.get_interrupt_line());
}
private:
@ -772,12 +778,25 @@ class ConcreteMachine:
AudioSource mixer_;
Outputs::Speaker::LowpassSpeaker<AudioSource> speaker_;
Cycles cycles_since_audio_update_;
Cycles cycles_until_audio_event_;
static constexpr int audio_divider = 16;
void update_audio() {
const auto divided_cycles = cycles_since_audio_update_.divide(Cycles(audio_divider));
sound_glu_.run_for(divided_cycles);
speaker_.run_for(audio_queue_, divided_cycles);
}
class AudioUpdater {
public:
AudioUpdater(ConcreteMachine *machine) : machine_(machine) {
machine_->update_audio();
}
~AudioUpdater() {
machine_->cycles_until_audio_event_ = machine_->sound_glu_.get_next_sequence_point();
}
private:
ConcreteMachine *machine_;
};
friend AudioUpdater;
// MARK: - Cards.