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PicoVideoRead optimization

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@511 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-07-01 16:12:04 +00:00
parent 2aa27095f2
commit 9761a7d0d4
10 changed files with 90 additions and 64 deletions
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81
Pico/VideoPort.c
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@ -449,24 +449,19 @@ PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
{
a&=0x1c;
if (a==0x00) // data port
{
return VideoRead();
}
if (a==0x04) // control port
{
struct PicoVideo *pv=&Pico.video;
unsigned int d;
d=pv->status;
if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
if (!(pv->reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled
//if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
d|=(pv->pending_ints&0x20)<<2; // V-int pending?
d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
d |= (pv->pending_ints&0x20)<<2; // V-int pending?
if (d&0x100) pv->status&=~0x100; // FIFO no longer full
pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)
pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)
elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);
return d;
@ -489,32 +484,60 @@ PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
// check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
if ((a&0x1c)==0x08)
{
unsigned int hc, d;
unsigned int d;
int lineCycles;
lineCycles = (488-SekCyclesLeft)&0x1ff;
d = Pico.m.scanline; // V-Counter
if (Pico.video.reg[12]&1)
hc=hcounts_40[lineCycles];
else hc=hcounts_32[lineCycles];
d = hcounts_40[lineCycles];
else d = hcounts_32[lineCycles];
if (Pico.m.pal) {
if (d >= 0x103) d-=56; // based on Gens
} else {
if (d >= 0xEB) d-=6;
}
elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
return d | (Pico.video.v_counter << 8);
}
if ((Pico.video.reg[12]&6) == 6) {
// interlace mode 2 (Combat Cars (UE) [!])
d <<= 1;
if (d&0xf00) d|= 1;
}
elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);
d&=0xff; d<<=8;
d|=hc;
return d;
if (a==0x00) // data port
{
return VideoRead();
}
return 0;
}
unsigned int PicoVideoRead8(unsigned int a)
{
unsigned int d;
a&=0x1d;
switch (a)
{
case 0: return VideoRead() >> 8;
case 1: return VideoRead() & 0xff;
case 4: // control port/status reg
d = Pico.video.status >> 8;
if (d&1) Pico.video.status&=~0x100; // FIFO no longer full
Pico.video.pending = 0;
elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
return d;
case 5:
d = Pico.video.status & 0xff;
//if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?
if (SekCyclesLeft < 84+4) d |= 4; // H-Blank
Pico.video.pending = 0;
elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
return d;
case 8: // hv counter
elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
return Pico.video.v_counter;
case 9:
d = (488-SekCyclesLeft)&0x1ff;
if (Pico.video.reg[12]&1)
d = hcounts_40[d];
else d = hcounts_32[d];
elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);
return d;
}
return 0;