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games/snes: added offset-per-tile

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This commit is contained in:
aiju 2014-03-20 15:21:53 +01:00
parent a6f3ba79c2
commit 3a54967108
1 changed files with 107 additions and 0 deletions
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107
sys/src/games/snes/ppu.c
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@ -248,6 +248,7 @@ static struct bgctxt {
u32int c[2];
int pal;
u8int msz, mv, mx;
u16int otx, oty, otny;
} bgctxts[4];
static void
@ -321,6 +322,101 @@ bg(int n)
chr(n, p->nb, p->sz, p->t, p->tnx, p->tny, p->c);
}
static void
optinit(void)
{
struct bgctxt *p;
p = bgctxts + 2;
p->szsh = (reg[BGMODE] & (1<<6)) != 0 ? 4 : 3;
p->sz = 1<<p->szsh;
p->tnx = hofs[2] & (p->sz - 1);
p->tx = hofs[2] >> p->szsh;
bgctxts[0].otx = bgctxts[1].otx = 0xffff;
bgctxts[0].oty = bgctxts[0].ty;
bgctxts[0].otny = bgctxts[0].tny;
bgctxts[1].oty = bgctxts[1].ty;
bgctxts[1].otny = bgctxts[1].tny;
}
static void
opt(void)
{
struct bgctxt *p;
u16int hval, vval;
int sx, sy;
p = bgctxts + 2;
if(++p->tnx == p->sz){
if(mode == 4){
hval = tile(2, p->tx, vofs[2] >> p->szsh);
if((hval & 0x8000) != 0){
vval = hval;
hval = 0;
}else
vval = 0;
}else{
hval = tile(2, p->tx, vofs[2] >> p->szsh);
vval = tile(2, p->tx, (vofs[2]+8) >> p->szsh);
}
sx = (rx & ~7) + (hval & 0x1ff8);
sy = ppuy + (vval & 0x1fff);
if((vval & 0x2000) != 0){
bgctxts[0].oty = sy >> bgctxts[0].szsh;
bgctxts[0].otny = sy & (bgctxts[0].sz - 1);
}else{
bgctxts[0].oty = bgctxts[0].ty;
bgctxts[0].otny = bgctxts[0].tny;
}
if((vval & 0x4000) != 0){
bgctxts[1].oty = sy >> bgctxts[1].szsh;
bgctxts[1].otny = sy & (bgctxts[1].sz - 1);
}else{
bgctxts[1].oty = bgctxts[1].ty;
bgctxts[1].otny = bgctxts[1].tny;
}
if((hval & 0x2000) != 0)
bgctxts[0].otx = sx >> bgctxts[0].szsh;
else
bgctxts[0].otx = 0xffff;
if((hval & 0x4000) != 0)
bgctxts[1].otx = sx >> bgctxts[1].szsh;
else
bgctxts[1].otx = 0xffff;
p->tnx = 0;
p->tx++;
}
}
static void
bgopt(int n)
{
struct bgctxt *p;
u8int v;
p = bgctxts + n;
v = bgpixel(p->c, p->nb, p->t & 0x4000);
if(p->msz != 1)
if(p->mx++ == 0)
p->mv = v;
else{
if(p->mx == p->msz)
p->mx = 0;
v = p->mv;
}
if(v != 0)
pixel(n, p->pal + v, p->pri[(p->t & 0x2000) != 0]);
if(++p->tnx == p->sz){
p->tx++;
p->tnx = 0;
}
if((p->tnx & 7) == 0){
p->t = tile(n, p->otx == 0xffff ? p->tx : p->otx, p->oty);
p->pal = palette(n, p->t >> 10 & 7);
chr(n, p->nb, p->sz, p->t, p->tnx, p->otny, p->c);
}
}
struct bg7ctxt {
int x, y, x0, y0;
u8int msz, mx, mv;
@ -452,11 +548,17 @@ bgsinit(void)
case 2:
bginit(0, 4, 0x40, 0xa0);
bginit(1, 4, 0x11, 0x71);
optinit();
break;
case 3:
bginit(0, 8, 0x40, 0xa0);
bginit(1, 4, 0x11, 0x71);
break;
case 4:
bginit(0, 8, 0x40, 0xa0);
bginit(1, 2, 0x11, 0x71);
optinit();
break;
case 7:
bg7init(0);
if((reg[SETINI] & EXTBG) != 0)
@ -485,6 +587,11 @@ bgs(void)
bg(2);
break;
case 2:
case 4:
opt();
bgopt(0);
bgopt(1);
break;
case 3:
bg(0);
bg(1);