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trying to add movie support

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@3 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2006-12-21 22:55:45 +00:00
parent cc68a136aa
commit 4f67228034
6 changed files with 215 additions and 107 deletions
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72
Pico/Pico.c
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@ -187,11 +187,70 @@ int PicoReset(int hard)
return 0;
}
static int dma_timings[] = {
83, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
102, 205, 204, 102, // vblank: 40cell:
8, 16, 15, 8, // active: 32cell:
9, 18, 17, 9 // ...
};
static void CheckDMA(void)
{
int burn = 0, bytes_can = 0, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
int bytes = Pico.m.dma_bytes;
if(dma_op & 2) bytes_can = dma_op;
else if(Pico.video.type!=1) bytes_can = 1; // setting dma_timings offset here according to Gens
if(Pico.video.reg[12] & 1) bytes_can += 4; // 40 cell mode?
if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) { dma_op|=4; bytes_can += 8; } // active display?
bytes_can = dma_timings[bytes_can];
if(bytes <= bytes_can) {
if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
else {
if(dma_op&4) burn = bytes*(((488<<8)/18 ))>>8; // have to be approximate because can't afford division..
else burn = bytes*(((488<<8)/205))>>8;
}
Pico.m.dma_bytes = 0;
} else {
if(!(dma_op&2)) burn = 488;
Pico.m.dma_bytes -= bytes_can;
}
SekCycleCnt+=burn;
dprintf("~Dma %i op=%i can=%i burn=%i [%i|%i]", Pico.m.dma_bytes, dma_op, bytes_can, burn, Pico.m.scanline, SekCyclesDone());
}
static __inline void SekRun(int cyc)
{
int cyc_do;
SekCycleAim+=cyc;
if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
#if 0
if(Pico.m.dma_bytes) {
int burn=0;
if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank?
if(Pico.m.dma_bytes < 205) {
burn = Pico.m.dma_bytes*(((488<<8)/205))>>8;
Pico.m.dma_bytes = 0;
} else {
burn += 488;
Pico.m.dma_bytes -= 205;
}
} else {
if(Pico.m.dma_bytes < 18) {
burn = Pico.m.dma_bytes*(((488<<8)/18))>>8;
Pico.m.dma_bytes = 0;
} else {
burn += 488;
Pico.m.dma_bytes -= 18;
}
}
SekCycleCnt+=burn;
dprintf("~DmaSlow %i burn=%i do=%i [%i|%i]", Pico.m.dma_bytes, burn, SekCycleAim-SekCycleCnt,
Pico.m.scanline, SekCyclesDone());
}
#endif
if((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
#if defined(EMU_C68K) && defined(EMU_M68K)
// this means we do run-compare Cyclone vs Musashi
SekCycleCnt+=CM_compareRun(cyc_do);
@ -333,12 +392,10 @@ static int PicoFrameHints(void)
{
//dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
pv->status|=0x88; // V-Int happened, go into vblank
SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
/*if(Pico.m.z80Run && (PicoOpt&4)) {
z80CycleAim+=cycles_z80/2;
total_z80+=z80_run(z80CycleAim-total_z80);
z80CycleAim-=cycles_z80/2;
}*/
if(!Pico.m.dma_bytes||(Pico.video.reg[0x17]&0x80)) {
// there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
SekRun(128); SekCycleAim-=128;
}
pv->pending_ints|=0x20;
if(pv->reg[1]&0x20) SekInterrupt(6);
if(Pico.m.z80Run && (PicoOpt&4)) // ?
@ -364,6 +421,7 @@ static int PicoFrameHints(void)
getSamples(y);
// Run scanline:
if(Pico.m.dma_bytes) CheckDMA();
SekRun(cycles_68k);
if((PicoOpt&4) && Pico.m.z80Run) {
Pico.m.z80Run|=2;