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Sonic CD shows it's title screen

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@19 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-01-14 19:27:47 +00:00
parent cb4a513a96
commit ab0607f7e4
4 changed files with 172 additions and 44 deletions
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50
Pico/VideoPort.c
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@ -14,6 +14,7 @@ extern const unsigned char hcounts_40[];
extern const unsigned short vcounts[];
extern int rendstatus;
typedef unsigned char u8;
typedef unsigned short u16;
@ -93,13 +94,44 @@ static void DmaSlow(int len)
SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));
}
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
if ((source&0xe00000)==0xe00000) { // Ram
pd=(u16 *)(Pico.ram+(source&0xfffe));
pdend=(u16 *)(Pico.ram+0x10000);
} else if(PicoMCD & 1) {
dprintf("DmaSlow CD");
if(source<0x20000) { // Bios area
pd=(u16 *)(Pico_mcd->bios+(source&~1));
pdend=(u16 *)(Pico_mcd->bios+0x20000);
} else if ((source&0xfc0000)==0x200000 && (!(Pico_mcd->s68k_regs[3]&4))) { // Word Ram
if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
pd=(u16 *)(Pico_mcd->word_ram+(source&0x3fffe));
pdend=(u16 *)(Pico_mcd->word_ram+0x40000);
} else {
dprintf("DmaSlow: unsupported src");
return;
}
} else if ((source&0xfe0000)==0x020000) { // Prg Ram
u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
pd=(u16 *)(prg_ram+(source&0x1fffe));
pdend=(u16 *)(prg_ram+0x20000);
} else {
dprintf("DmaSlow: unsupported src");
return;
}
} 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
if(source<Pico.romsize) { // Rom
pd=(u16 *)(Pico.rom+(source&~1));
pdend=(u16 *)(Pico.rom+Pico.romsize);
} else {
dprintf("DmaSlow: invalid dma src");
return;
}
}
// overflow protection, might break something..
if (len > pdend - pd) {
len = pdend - pd;
dprintf("DmaSlow overflow");
}
switch (Pico.video.type)
@ -114,7 +146,7 @@ static void DmaSlow(int len)
// AutoIncrement
a=(u16)(a+inc);
// didn't src overlap?
if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
//if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
}
rendstatus|=0x10;
break;
@ -128,7 +160,7 @@ static void DmaSlow(int len)
// AutoIncrement
a2+=inc;
// didn't src overlap?
if(pd >= pdend) pd-=0x8000;
//if(pd >= pdend) pd-=0x8000;
// good dest?
if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
}
@ -143,7 +175,7 @@ static void DmaSlow(int len)
// AutoIncrement
a2+=inc;
// didn't src overlap?
if(pd >= pdend) pd-=0x8000;
//if(pd >= pdend) pd-=0x8000;
// good dest?
if(a2 >= 0x80) break;
}