void resetRSID() {
sProgramMode= MAIN_OFFSET_MASK;
sMainLoopOnlyMode= 0;
sTodInMillies= 0;
// some IRQ players don't finish within one screen, e.g. A-Maze-Ing.sid and Axel_F.sid
// (Sean Connolly) even seems to play digis during multi-screen IRQs (so give them more time)
setIrqTimeout(getCyclesPerScreen()*4);
// reset IO area
resetIO(getCyclesPerScreen(), isRsid());
}
static int EMSCRIPTEN_KEEPALIVE playTune(int selectedTrack) {
sActualSubsong= selectedTrack;
reInitEngine();
synth_init(sSampleRate);
initClockSpeed();
initSampleBuffer();
initC64Rom();
// reset & init
memcpy(memory, sMemorySnapshot, MEMORY_SIZE); // restore original mem content.. previous "sInitAddr" run may have corrupted the state
// CIA 1 defaults (by default C64 is configured with CIA1 timer / not raster irq)
setIO(0xdc0d, 0x81); // interrupt control (interrupt through timer A)
setIO(0xdc0e, 0x01); // control timer A: start - must already be started (e.g. Phobia, GianaSisters, etc expect it)
setIO(0xdc0f, 0x08); // control timer B (start/stop) means auto-restart
setIO(0xdc04, sTotalCyclesPerScreen&0xff); // timer A (1x pro screen refresh)
setIO(0xdc05, sTotalCyclesPerScreen>>8);
if (isRsid()) {
// by default C64 is configured with CIA1 timer / not raster irq
setIO(0xd01a, 0x00); // raster irq not active
setIO(0xd011, 0x1B);
setIO(0xd012, 0x00); // raster at line x
// CIA 2 defaults
setIO(0xdd0e, 0x08); // control timer 2A (start/stop)
setIO(0xdd0f, 0x08); // control timer 2B (start/stop)
}
setupInitMemoryBank();
initCia();
initVic();
sOverflowDigiCount=0;
sDigiCount=0;
hackIfNeeded();
sMainProgStatus= callMain(sInitAddr, sActualSubsong, 0, CYCLELIMIT); // if it does not complete then it is likely in an endless loop / maybe digi player
initBuffers();
setupPsidPlayMemoryBank();
return 0;
}
static int EMSCRIPTEN_KEEPALIVE loadSidFile(void * inBuffer, int inBufSize) {
sSampleRate= 44100; // TODO: extend API & use actual target sample rate
sInitAddr= 0;
sPlayAddr= 0;
sLoadEndAddr= 0;
sActualSubsong= 0;
sMaxSubsong= 0;
sPlaySpeed= 0;
sNtscMode= 0;
unsigned char sidmem[65536];
unsigned char *buffer = sidmem;
memcpy(buffer, inBuffer, inBufSize);
sIsPSID= (buffer[0x00]==0x50?1:0);
sSidVersion= buffer[0x05];
sIsC64compatible= (sSidVersion & 0x2) && ((buffer[0x77] & 0x2) == 0);
sNtscMode= (sSidVersion == 2) && !isRsid() && (buffer[0x77] & 0x8); // NTSC bit
int i;
for (i=0;i<32;i++) song_name[i] = buffer[0x16+i];
for (i=0;i<32;i++) song_author[i] = buffer[0x36+i];
for (i=0;i<32;i++) song_copyright[i] = buffer[0x56+i];
unsigned short load_addr;
LoadSIDFromMemory(sidmem, &load_addr, &sLoadEndAddr, &sInitAddr, &sPlayAddr, &sMaxSubsong,
&sActualSubsong, &sPlaySpeed, inBufSize);
memcpy(sMemorySnapshot, memory, MEMORY_SIZE);
loadResult[0]= &load_addr;
loadResult[1]= &sPlaySpeed;
loadResult[2]= &sMaxSubsong;
loadResult[3]= &sActualSubsong;
loadResult[4]= song_name;
loadResult[5]= song_author;
loadResult[6]= song_copyright;
return 0;
}
static void setupInitMemoryBank() {
unsigned char memBankSetting= 0x37; // default memory config: basic ROM, IO area & kernal ROM visible
if (!isRsid()) {
// problem: some PSID init routines want to initialize registers in the IO area while others
// actually expect to use the RAM in that area.. none of them setup the memory banks accordingly :(
if ((sInitAddr >= 0xd000) && (sInitAddr < 0xe000)) {
memBankSetting= 0x34; // default memory config: all RAM
} else if ((sInitAddr >= 0xe000)) {
// PSIDv2 songs like IK_plus.sid, Pandora.sid use the ROM below the kernal *without* setting 0x0001
// so obviously here we must use a default like this:
memBankSetting= 0x35; // default memory config: IO area visible, RAM $a000-b000 + $e000-$ffff
} else if (sLoadEndAddr >= 0xa000) {
memBankSetting= 0x36;
} else {
// normally the kernal ROM should be visible: e.g. A-Maz-Ing.sid uses kernal ROM routines & vectors
// without setting $01!
memBankSetting= 0x37; // default memory config: basic ROM, IO area & kernal ROM visible
}
}
memory[0x0001]= memBankSetting;
}
