xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

games/snes: bug fixes

Browse source
This commit is contained in:
aiju 2014-03-21 16:55:16 +01:00
parent 49ecfb6689
commit 4abb38f177
2 changed files with 35 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
sys/src/games/snes/mem.c
View file

@ -37,21 +37,28 @@ vrammap(u16int a)
}
}
static void
vramread(void)
{
u16int b;
b = vrammap(reg[0x2116] | reg[0x2117] << 8);
vramlatch = vram[b++];
vramlatch |= vram[b] << 8;
}
static void
incvram(int i, int r)
{
u16int a, b;
u16int a;
int c;
c = reg[0x2115];
if((c >> 7) != i)
return;
a = reg[0x2116] | reg[0x2117] << 8;
if(r){
b = vrammap(a);
vramlatch = vram[b++];
vramlatch |= vram[b] << 8;
}
if(r)
vramread();
switch(c & 3){
case 0: a++; break;
case 1: a += 32; break;
@ -162,14 +169,14 @@ regread(u16int p)
return reg[OPVCTH] | mdr2 & 0xfe;
return mdr2 = reg[p];
case 0x213e:
return (mdr1 = reg[p]) | mdr & 0x10;
return mdr1 = reg[p] | mdr1 & 0x10;
case 0x213f:
v = 2 | reg[OPCTLATCH] & 0x40;
v = reg[OPCTLATCH] & 0x40;
if((reg[0x4201] & 0x80) != 0)
reg[OPCTLATCH] &= ~0x43;
else
reg[OPCTLATCH] &= ~3;
return mdr2 = v | mdr2 & 0x20;
return mdr2 = reg[p] | v | mdr2 & 0x20;
case 0x2180:
v = memread(0x7e0000 | reg[0x2181] | reg[0x2182] << 8 | (reg[0x2183] & 1) << 16);
incwram();
@ -189,7 +196,9 @@ regread(u16int p)
case 0x4017:
return 0x1f | mdr & 0xe0;
case 0x4210:
return reg[p] | mdr & 0x70;
v = reg[p];
reg[p] &= ~VBLANK;
return v | mdr & 0x70;
case 0x4211:
v = irq;
irq &= ~IRQPPU;
@ -209,6 +218,10 @@ regread(u16int p)
case 0x4219: case 0x421a: case 0x421b: case 0x421c: case 0x421d:
case 0x421e: case 0x421f:
return reg[p];
case 0x2104: case 0x2105: case 0x2106: case 0x2108: case 0x2109: case 0x210a:
case 0x2114: case 0x2115: case 0x2116: case 0x2118: case 0x2119: case 0x211a:
case 0x2124: case 0x2125: case 0x2126: case 0x2128: case 0x2129: case 0x212a:
return mdr1;
}
if((p & 0xff80) == 0x4300)
return reg[p];
@ -270,11 +283,12 @@ regwrite(u16int p, u8int v)
vofs[(p - 0x210e) >> 1] = v << 8 | reg[OFSPREV];
reg[OFSPREV] = v;
break;
case 0x2116:
break;
case 0x2117:
v &= 0x7f;
break;
case 0x2116:
reg[p] = v;
vramread();
return;
case 0x2118:
a = vrammap(reg[0x2116] | reg[0x2117] << 8);
vram[a] = v;
@ -620,6 +634,7 @@ void
memreset(void)
{
reg[0x213e] = 1;
reg[0x213f] = 2;
reg[0x4201] = 0xff;
reg[0x4210] = 2;
}

14
sys/src/games/snes/ppu.c
View file

@ -618,7 +618,7 @@ sprites(void)
u32int *ch;
} t[32], *tp;
static u32int ch[34];
static u8int *p, q, over;
static u8int *p, q;
static int n, m;
static int *sz;
static int szs[] = {
@ -635,7 +635,6 @@ sprites(void)
if(rx == 0){
n = 0;
over = 1;
sp = s;
sz = szs + ((reg[OBSEL] & 0xe0) >> 3);
base[0] = (reg[OBSEL] & 0x07) << 14;
@ -654,10 +653,10 @@ sprites(void)
sp->x = p[0];
if((q & 1) != 0)
sp->x |= 0xff00;
if(sp->x < -(short)sp->sx && sp->x != -256)
if(sp->x <= -(short)sp->sx && sp->x != -256)
goto nope;
if(n == 32){
over |= 0x40;
reg[0x213e] |= 0x40;
goto nope;
}
sp->i = rx >> 1;
@ -742,7 +741,7 @@ nope:
*cp++ = w;
tp->sx += 8;
}else
over |= 0x80;
reg[0x213e] |= 0x80;
}
}else
for(i = 0; i < nt; i++){
@ -755,7 +754,7 @@ nope:
tp->sx += 8;
a += 15;
}else
over |= 0x80;
reg[0x213e] |= 0x80;
}
if(sp->x < 0 && (i = (-sp->x) & 7) != 0)
if((sp->c & 0x40) != 0)
@ -763,7 +762,6 @@ nope:
else
*tp->ch <<= i;
}
reg[0x213e] = over;
}
}
@ -868,6 +866,8 @@ ppustep(void)
if(++ppuy >= 262){
ppuy = 0;
reg[RDNMI] &= ~VBLANK;
reg[0x213e] = 1;
reg[0x213f] ^= 0x80;
hdma = reg[0x420c]<<8;
flush();
}