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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@14 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-01-02 22:17:05 +00:00
parent 8c1952f0d7
commit 672ad67113
13 changed files with 165 additions and 100 deletions
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57
Pico/VideoPort.c
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@ -58,26 +58,6 @@ static unsigned int VideoRead()
return d;
}
#if 0
// calculate the number of cycles 68k->VDP dma operation would take
static int DmaSlowBurn(int len)
{
// test: Legend of Galahad, Time Killers
int burn,maxlen,line=Pico.m.scanline;
if(line == -1) line=vcounts[SekCyclesDone()>>8];
maxlen=(224-line)*18;
if(len <= maxlen)
burn = len*(((488<<8)/18))>>8;
else {
burn = maxlen*(((488<<8)/18))>>8;
burn += (len-maxlen)*(((488<<8)/180))>>8;
}
return burn;
}
#endif
static int GetDmaLength()
{
struct PicoVideo *pvid=&Pico.video;
@ -95,7 +75,7 @@ static void DmaSlow(int len)
u16 *pd=0, *pdend, *r;
unsigned int a=Pico.video.addr, a2, d;
unsigned char inc=Pico.video.reg[0xf];
unsigned int source; // , burn;
unsigned int source;
source =Pico.video.reg[0x15]<<1;
source|=Pico.video.reg[0x16]<<9;
@ -105,27 +85,22 @@ static void DmaSlow(int len)
Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
Pico.m.scanline, SekCyclesDone(), SekPc);
if ((source&0xe00000)==0xe00000) { pd=(u16 *)(Pico.ram+(source&0xfffe)); pdend=(u16 *)(Pico.ram+0x10000); } // Ram
else if(source<Pico.romsize) { pd=(u16 *)(Pico.rom+(source&~1)); pdend=(u16 *)(Pico.rom+Pico.romsize); } // Rom
else return; // Invalid source address
if(Pico.m.scanline != -1) {
Pico.m.dma_bytes += len;
SekSetCyclesLeft(SekCyclesLeft - CheckDMA());
} else {
// be approximate in non-accurate mode
SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));
}
#if 0
// CPU is stopped during DMA, so we burn some cycles to compensate that
if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank?
burn = (len*(((488<<8)/167))>>8); // very approximate
if(!(Pico.video.status&8)) burn+=burn>>1; // a hack for Legend of Galahad
} else burn = DmaSlowBurn(len);
SekCyclesBurn(burn);
#else
Pico.m.dma_bytes += len;
#endif
//if(!(Pico.video.status&8))
// SekEndRun(0);
//Pico.m.dma_endcycles = 0;//SekCyclesLeft;
//Pico.m.dma_endcycles -= Pico.m.dma_endcycles>>3; // hack
SekSetCyclesLeft(SekCyclesLeft - CheckDMA());
// CheckDMA();
// dprintf("DmaSlow burn: %i @ %06x", burn, SekPc);
if ((source&0xe00000)==0xe00000) { pd=(u16 *)(Pico.ram+(source&0xfffe)); pdend=(u16 *)(Pico.ram+0x10000); } // Ram
else if(PicoMCD & 1) {
if(source<0x20000) { pd=(u16 *)(Pico_mcd->bios+(source&~1)); pdend=(u16 *)(Pico_mcd->bios+0x20000); } // Bios area
else { dprintf("unsupported src"); return; } // Invalid source address
} else {
if(source<Pico.romsize) { pd=(u16 *)(Pico.rom+(source&~1)); pdend=(u16 *)(Pico.rom+Pico.romsize); } // Rom
else { dprintf("invalid dma src"); return; } // Invalid source address
}
switch (Pico.video.type)
{