RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 15:27:46 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

improved VRAM128K support (overdrive 2)

Browse source
This commit is contained in:
kub 2020-01-26 20:48:25 +01:00
parent 1259ac4f60
commit e1e7d1ed1c
1 changed files with 20 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

26
pico/videoport.c
View file

@ -22,11 +22,12 @@ static __inline void AutoIncrement(void)
Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
}
static NOINLINE void VideoWrite128(u32 a, u16 d)
static NOINLINE unsigned int VideoWrite128(u32 a, u16 d)
{
// nasty
a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);
((u8 *)PicoMem.vram)[a] = d;
return a;
}
static void VideoWrite(u16 d)
@ -38,16 +39,19 @@ static void VideoWrite(u16 d)
case 1: if (a & 1)
d = (u16)((d << 8) | (d >> 8));
PicoMem.vram [(a >> 1) & 0x7fff] = d;
if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
if ((unsigned)(a - ((Pico.video.reg[5]&0x7f) << 9)) < 0x400)
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
break;
case 3: if (PicoMem.cram [(a >> 1) & 0x3f] != d) Pico.m.dirtyPal = 1;
PicoMem.cram [(a >> 1) & 0x3f] = d; break;
case 5: PicoMem.vsram[(a >> 1) & 0x3f] = d; break;
case 0x81:
a |= Pico.video.addr_u << 16;
VideoWrite128(a, d);
break;
case 0x81: if (a & 1)
d = (u16)((d << 8) | (d >> 8));
a |= Pico.video.addr_u << 16;
a = VideoWrite128(a, d);
if ((unsigned)(a - ((Pico.video.reg[5]&0x7f) << 9)) < 0x400)
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
break;
//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
}
@ -276,6 +280,16 @@ static NOINLINE void DmaFill(int data)
if (!once++)
elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");
}
case 0x81:
for (l = len; l; l--) {
VideoWrite128(a, data);
// Increment address register
a = (a + inc) & 0x1ffff;
}
Pico.video.addr_u = a >> 16;
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
break;
default:
a += len * inc;
break;