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Attempt full audio output.

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This commit is contained in:
Thomas Harte 2023-11-21 22:28:33 -05:00
parent 972d1d1ddd
commit 3da3401125
1 changed files with 53 additions and 22 deletions
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75
Machines/PCCompatible/PCCompatible.cpp
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@ -32,20 +32,57 @@
namespace PCCompatible {
struct PCSpeaker {
PCSpeaker() :
toggle(queue),
speaker(toggle) {}
void update() {
speaker.run_for(queue, cycles_since_update);
cycles_since_update = 0;
}
void set_pit(bool pit_input) {
pit_input_ = pit_input;
set_level();
}
void set_control(bool pit_mask, bool level) {
pit_mask_ = pit_mask;
level_ = level;
set_level();
}
void set_level() {
toggle.set_output(pit_mask_ ? pit_input_ : level_);
}
Concurrency::AsyncTaskQueue<false> queue;
Audio::Toggle toggle;
Outputs::Speaker::PullLowpass<Audio::Toggle> speaker;
Cycles cycles_since_update = 0;
bool pit_input_ = false;
bool pit_mask_ = false;
bool level_ = false;
};
class PITObserver {
public:
PITObserver(PIC &pic) : pic_(pic) {}
PITObserver(PIC &pic, PCSpeaker &speaker) : pic_(pic), speaker_(speaker) {}
template <int channel>
void update_output(bool new_level) {
switch(channel) {
default: break;
case 0: pic_.apply_edge<0>(new_level); break;
case 2: speaker_.set_pit(new_level); break;
}
}
private:
PIC &pic_;
PCSpeaker &speaker_;
// TODO:
//
@ -58,10 +95,13 @@ using PIT = i8237<false, PITObserver>;
class i8255PortHandler : public Intel::i8255::PortHandler {
// Likely to be helpful: https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol
public:
i8255PortHandler(PCSpeaker &speaker) : speaker_(speaker) {}
void set_value(int port, uint8_t value) {
switch(port) {
case 1:
high_switches_ = value & 0x08;
speaker_.set_control(value & 0x01, value & 0x02);
break;
}
printf("PPI: %02x to %d\n", value, port);
@ -93,6 +133,7 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
private:
bool high_switches_ = false;
PCSpeaker &speaker_;
// Provisionally, possibly:
//
@ -537,17 +578,16 @@ class ConcreteMachine:
[[maybe_unused]] const Analyser::Static::Target &target,
const ROMMachine::ROMFetcher &rom_fetcher
) :
pit_observer_(pic_),
pit_observer_(pic_, speaker_),
ppi_handler_(speaker_),
pit_(pit_observer_),
ppi_(ppi_handler_),
context(pit_, dma_, ppi_, pic_),
audio_toggle_(audio_queue_),
speaker_(audio_toggle_)
context(pit_, dma_, ppi_, pic_)
{
// Use clock rate as a MIPS count; keeping it as a multiple or divisor of the PIT frequency is easy.
static constexpr int pit_frequency = 1'193'182;
set_clock_rate(double(pit_frequency));
speaker_.set_input_rate(double(pit_frequency));
speaker_.speaker.set_input_rate(double(pit_frequency));
// Fetch the BIOS. [8088 only, for now]
const auto bios = ROM::Name::PCCompatibleGLaBIOS;
@ -563,7 +603,7 @@ class ConcreteMachine:
}
~ConcreteMachine() {
audio_queue_.flush();
speaker_.queue.flush();
}
// MARK: - TimedMachine.
@ -579,8 +619,8 @@ class ConcreteMachine:
// Advance the PIT.
pit_.run_for(1);
// Advance audio.
++cycles_since_audio_update_;
// Advance audio clock.
++speaker_.cycles_since_update;
// Advance the CPU.
cpu_divisor_ += CPUMultiplier;
@ -652,23 +692,20 @@ class ConcreteMachine:
// MARK: - AudioProducer.
Outputs::Speaker::Speaker *get_speaker() override {
return &speaker_;
return &speaker_.speaker;
}
void flush_output(int outputs) final {
if(outputs & Output::Audio) {
update_audio();
audio_queue_.perform();
speaker_.update();
speaker_.queue.perform();
}
}
void update_audio() {
speaker_.run_for(audio_queue_, cycles_since_audio_update_);
}
private:
PIC pic_;
DMA dma_;
PCSpeaker speaker_;
PITObserver pit_observer_;
i8255PortHandler ppi_handler_;
@ -709,12 +746,6 @@ class ConcreteMachine:
std::pair<int, InstructionSet::x86::Instruction<false>> decoded;
int cpu_divisor_ = 0;
// PC speaker.
Concurrency::AsyncTaskQueue<false> audio_queue_;
Audio::Toggle audio_toggle_;
Outputs::Speaker::PullLowpass<Audio::Toggle> speaker_;
Cycles cycles_since_audio_update_ = 0;
};