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games/snes: mode 7

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This commit is contained in:
aiju 2014-03-15 21:46:00 +01:00
parent 0c9a1e6653
commit 744f038e86
4 changed files with 164 additions and 10 deletions
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8
sys/src/games/snes/dat.h
View file

@ -10,9 +10,11 @@ extern u32int keys, keylatch, lastkeys;
extern u8int reg[32768], spcmem[65536], vram[65536], oam[544];
extern u16int cgram[256];
extern int ppux, ppuy;
extern int ppux, ppuy, rx;
extern u16int vtime, htime, subcolor, oamaddr;
extern u16int m7[6], hofs[4], vofs[4];
extern u16int hofs[5], vofs[5];
typedef signed short s16int;
extern s16int m7[6];
extern int battery, saveclock, scale, mouse;
@ -43,6 +45,7 @@ enum {
OAMADDH = 0x2103,
BGMODE = 0x2105,
MOSAIC = 0x2106,
M7SEL = 0x211a,
WIN1 = 2,
INVW1 = 1,
WIN2 = 8,
@ -55,6 +58,7 @@ enum {
CGADSUB = 0x2131,
DIRCOL = 1,
SETINI = 0x2133,
EXTBG = 1<<6,
OVERSCAN = 1<<2,
AUTOJOY = 1,
NMITIMEN = 0x4200,

36
sys/src/games/snes/mem.c
View file

@ -21,6 +21,8 @@ enum {
OPVCTH,
};
extern void calc7(void);
static void
incvram(int i, int r)
{
@ -220,15 +222,29 @@ regwrite(u16int p, u8int v)
oam[oamaddr & 0x21f] = v;
oamaddr = (oamaddr + 1) & 0x3ff;
return;
case 0x210d: case 0x210f:
case 0x2111: case 0x2113:
case 0x2105:
reg[p] = v;
calc7();
return;
case 0x210d:
hofs[4] = (v & 0x1f) << 8 | reg[M7PREV];
if((v & 0x10) != 0)
hofs[4] |= 0xe000;
reg[M7PREV] = v;
calc7();
case 0x210f: case 0x2111: case 0x2113:
a = (p - 0x210d) >> 1;
hofs[a] = (v << 8) | reg[OFSPREV] & ~7 | (hofs[a] >> 8) & 7;
hofs[a] = v << 8 | reg[OFSPREV] & ~7 | (hofs[a] >> 8) & 7;
reg[OFSPREV] = v;
break;
case 0x210e: case 0x2110:
case 0x2112: case 0x2114:
vofs[(p - 0x210e) >> 1] = (v << 8) | reg[OFSPREV];
case 0x210e:
vofs[4] = (v & 0x1f) << 8 | reg[M7PREV];
if((v & 0x10) != 0)
vofs[4] |= 0xe000;
reg[M7PREV] = v;
calc7();
case 0x2110: case 0x2112: case 0x2114:
vofs[(p - 0x210e) >> 1] = v << 8 | reg[OFSPREV];
reg[OFSPREV] = v;
break;
case 0x2116:
@ -248,8 +264,14 @@ regwrite(u16int p, u8int v)
return;
case 0x211b: case 0x211c: case 0x211d:
case 0x211e: case 0x211f: case 0x2120:
m7[p - 0x211b] = (v << 8) | reg[M7PREV];
m7[p - 0x211b] = v << 8 | reg[M7PREV];
if(p >= 0x211f)
if((v & 0x10) != 0)
m7[p - 0x211b] |= 0xe000;
else
m7[p - 0x211b] &= 0x1fff;
reg[M7PREV] = v;
calc7();
break;
case 0x2121:
reg[CGLH] = 0;

129
sys/src/games/snes/ppu.c
View file

@ -9,7 +9,17 @@ static u8int mode, bright, pixelpri[2];
static u32int pixelcol[2];
u16int vtime = 0x1ff, htime = 0x1ff, subcolor, mosatop;
uchar pic[256*239*2*9];
u16int m7[6], hofs[4], vofs[4];
u16int hofs[5], vofs[5];
s16int m7[6];
enum {
M7A,
M7B,
M7C,
M7D,
M7X,
M7Y
};
enum { OBJ = 4, COL = 5, OBJNC = 8 };
@ -311,6 +321,113 @@ bg(int n)
chr(n, p->nb, p->sz, p->t, p->tnx, p->tny, p->c);
}
struct bg7ctxt {
int x, y, x0, y0;
u8int msz, mx, mv;
} b7[2];
void
calc7(void)
{
s16int t;
if((reg[0x2105] & 7) != 7)
return;
t = hofs[4] - m7[M7X];
if((t & 0x2000) != 0)
t |= ~0x3ff;
else
t &= 0x3ff;
b7->x0 = (t * m7[M7A]) & ~63;
b7->y0 = (t * m7[M7C]) & ~63;
t = vofs[4] - m7[M7Y];
if((t & 0x2000) != 0)
t |= ~0x3ff;
else
t &= 0x3ff;
b7->x0 += (t * m7[M7B]) & ~63;
b7->y0 += (t * m7[M7D]) & ~63;
b7->x0 += m7[M7X] << 8;
b7->y0 += m7[M7Y] << 8;
}
static void
bg7init(int n)
{
u8int m, y;
struct bg7ctxt *p;
p = b7 + n;
m = reg[M7SEL];
y = ppuy;
p->msz = 1;
if((reg[MOSAIC] & 1) != 0){
p->msz = (reg[MOSAIC] >> 4) + 1;
if(p->msz != 1)
y -= y % p->msz;
}
if(n == 1 && (reg[MOSAIC] & 2) != 0)
p->msz = (reg[MOSAIC] >> 4) + 1;
if((m & 2) != 0)
y = 255 - y;
p->x = b7->x0 + ((m7[M7B] * y) & ~63);
p->y = b7->y0 + ((m7[M7D] * y) & ~63);
if((m & 1) != 0){
p->x += 255 * m7[M7A];
p->y += 255 * m7[M7C];
}
}
static void
bg7(int n)
{
u16int x, y;
u8int m, v, t;
struct bg7ctxt *p;
p = b7 + n;
m = reg[M7SEL];
x = p->x >> 8;
y = p->y >> 8;
if((m & 0x80) == 0){
x &= 1023;
y &= 1023;
}else if(x > 1023 || y > 1023){
if((m & 0x40) != 0){
t = 0;
goto lookup;
}
v = 0;
goto end;
}
t = vram[x >> 2 & 0xfe | y << 5 & 0x7f00];
lookup:
v = vram[t << 7 | y << 4 & 0x70 | x << 1 & 0x0e | 1];
end:
if(p->msz != 1){
if(p->mx == 0)
p->mv = v;
else
v = p->mv;
if(++p->mx == p->msz)
p->mx = 0;
}
if(n == 1)
if((v & 0x80) != 0)
pixel(1, v & 0x7f, 0x71);
else
pixel(1, v, 0x11);
else
pixel(0, v, 0x40);
if((m & 1) != 0){
p->x -= m7[M7A];
p->y -= m7[M7C];
}else{
p->x += m7[M7A];
p->y += m7[M7C];
}
}
static void
bgsinit(void)
{
@ -336,6 +453,11 @@ bgsinit(void)
bginit(0, 8, 0x40, 0xa0);
bginit(1, 4, 0x11, 0x71);
break;
case 7:
bg7init(0);
if((reg[SETINI] & EXTBG) != 0)
bg7init(1);
break;
default:
bgctxts[0].sz = bgctxts[1].sz = 0;
if(bitch[mode]++ == 0)
@ -363,6 +485,11 @@ bgs(void)
bg(0);
bg(1);
break;
case 7:
bg7(0);
if((reg[SETINI] & EXTBG) != 0)
bg7(1);
break;
}
}

1
sys/src/games/snes/spc.c
View file

@ -442,6 +442,7 @@ spcstep(void)
if(trace)
print("SPC %.4x %.2x A=%.2x X=%.2x Y=%.2x P=%.2x S=%.2x\n", spc-1, op, sA, sX, sY, sP, sS);
switch(op){
case 0x00: return 2;
case 0x01: jsr(mem16(0xffde)); return 8;
case 0x02: setb(azp(), 0); return 4;
case 0x03: return branch((zp() & 0x01) != 0, 5);