/
msu1.cpp
182 lines (156 loc) · 4.46 KB
/
msu1.cpp
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#include <sfc/sfc.hpp>
namespace SuperFamicom {
MSU1 msu1;
#include "serialization.cpp"
auto MSU1::synchronizeCPU() -> void {
if(clock >= 0) scheduler.resume(cpu.thread);
}
auto MSU1::Enter() -> void {
while(true) {
scheduler.synchronize();
msu1.main();
}
}
auto MSU1::main() -> void {
double left = 0.0;
double right = 0.0;
if(io.audioPlay) {
if(audioFile) {
if(audioFile->end()) {
if(!io.audioRepeat) {
io.audioPlay = false;
audioFile->seek(io.audioPlayOffset = 8);
} else {
audioFile->seek(io.audioPlayOffset = io.audioLoopOffset);
}
} else {
io.audioPlayOffset += 4;
left = (double)(int16)audioFile->readl(2) / 32768.0 * (double)io.audioVolume / 255.0;
right = (double)(int16)audioFile->readl(2) / 32768.0 * (double)io.audioVolume / 255.0;
if(dsp.mute()) left = 0, right = 0;
}
} else {
io.audioPlay = false;
}
}
if(!system.runAhead) stream->sample(float(left), float(right));
step(1);
synchronizeCPU();
}
auto MSU1::step(uint clocks) -> void {
clock += clocks * (uint64_t)cpu.frequency;
}
auto MSU1::unload() -> void {
dataFile.reset();
audioFile.reset();
}
auto MSU1::power() -> void {
create(MSU1::Enter, 44100);
stream = Emulator::audio.createStream(2, frequency);
io.dataSeekOffset = 0;
io.dataReadOffset = 0;
io.audioPlayOffset = 0;
io.audioLoopOffset = 0;
io.audioTrack = 0;
io.audioVolume = 0;
io.audioResumeTrack = ~0; //no resume
io.audioResumeOffset = 0;
io.audioError = false;
io.audioPlay = false;
io.audioRepeat = false;
io.audioBusy = false;
io.dataBusy = false;
dataOpen();
audioOpen();
}
auto MSU1::dataOpen() -> void {
dataFile.reset();
string name = {"msu1/data.rom"};
if(dataFile = platform->open(ID::SuperFamicom, name, File::Read)) {
dataFile->seek(io.dataReadOffset);
}
}
auto MSU1::audioOpen() -> void {
audioFile.reset();
string name = {"msu1/track-", io.audioTrack, ".pcm"};
if(audioFile = platform->open(ID::SuperFamicom, name, File::Read)) {
if(audioFile->size() >= 8) {
uint32 header = audioFile->readm(4);
if(header == 0x4d535531) { //"MSU1"
io.audioLoopOffset = 8 + audioFile->readl(4) * 4;
if(io.audioLoopOffset > audioFile->size()) io.audioLoopOffset = 8;
io.audioError = false;
audioFile->seek(io.audioPlayOffset);
return;
}
}
audioFile.reset();
}
io.audioError = true;
}
auto MSU1::readIO(uint addr, uint8) -> uint8 {
cpu.synchronizeCoprocessors();
switch(0x2000 | addr & 7) {
case 0x2000:
return (
Revision << 0
| io.audioError << 3
| io.audioPlay << 4
| io.audioRepeat << 5
| io.audioBusy << 6
| io.dataBusy << 7
);
case 0x2001:
if(io.dataBusy) return 0x00;
if(!dataFile) return 0x00;
if(dataFile->end()) return 0x00;
io.dataReadOffset++;
return dataFile->read();
case 0x2002: return 'S';
case 0x2003: return '-';
case 0x2004: return 'M';
case 0x2005: return 'S';
case 0x2006: return 'U';
case 0x2007: return '1';
}
unreachable;
}
auto MSU1::writeIO(uint addr, uint8 data) -> void {
cpu.synchronizeCoprocessors();
switch(0x2000 | addr & 7) {
case 0x2000: io.dataSeekOffset = io.dataSeekOffset & 0xffffff00 | data << 0; break;
case 0x2001: io.dataSeekOffset = io.dataSeekOffset & 0xffff00ff | data << 8; break;
case 0x2002: io.dataSeekOffset = io.dataSeekOffset & 0xff00ffff | data << 16; break;
case 0x2003: io.dataSeekOffset = io.dataSeekOffset & 0x00ffffff | data << 24;
io.dataReadOffset = io.dataSeekOffset;
if(dataFile) dataFile->seek(io.dataReadOffset);
break;
case 0x2004: io.audioTrack = io.audioTrack & 0xff00 | data << 0; break;
case 0x2005: io.audioTrack = io.audioTrack & 0x00ff | data << 8;
io.audioPlay = false;
io.audioRepeat = false;
io.audioPlayOffset = 8;
if(io.audioTrack == io.audioResumeTrack) {
io.audioPlayOffset = io.audioResumeOffset;
io.audioResumeTrack = ~0; //erase resume track
io.audioResumeOffset = 0;
}
audioOpen();
break;
case 0x2006:
io.audioVolume = data;
break;
case 0x2007:
if(io.audioBusy) break;
if(io.audioError) break;
io.audioPlay = bool(data & 1);
io.audioRepeat = bool(data & 2);
boolean audioResume = bool(data & 4);
if(!io.audioPlay && audioResume) {
io.audioResumeTrack = io.audioTrack;
io.audioResumeOffset = io.audioPlayOffset;
}
break;
}
}
}