ref: ec60da4961b4acff96631e7b99c90a0f4500dbed
dir: /sys/src/games/snes/ppu.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
int ppux, ppuy, rx;
static u8int mode, bright, pixelpri[2], hires;
static u32int pixelcol[2];
u16int vtime = 0x1ff, htime = 0x1ff, subcolor;
uchar pic[256*239*2*3];
u16int hofs[5], vofs[5];
s16int m7[6];
enum {
M7A,
M7B,
M7C,
M7D,
M7X,
M7Y
};
enum { OBJ = 4, COL = 5, OBJNC = 8 };
static u16int
darken(u16int v)
{
u8int r, g, b;
r = (v >> 10) & 0x1f;
g = (v >> 5) & 0x1f;
b = v & 0x1f;
r = r * bright / 15;
g = g * bright / 15;
b = b * bright / 15;
return r << 10 | g << 5 | b;
}
static void
pixeldraw(int x, int y, u16int v, int s)
{
uchar *p;
u16int *q;
union { u16int w; u8int b[2]; } u;
if(bright != 0xf && s >= 0)
v = darken(v);
if(scale == 1){
p = pic + (x + y * 256) * 2;
p[0] = v;
p[1] = v >> 8;
return;
}
u.b[0] = v;
u.b[1] = v >> 8;
if(scale == 2){
q = (u16int*)pic + (x + y * 256) * 2;
if(s < 1)
q[0] = u.w;
q[1] = u.w;
}else{
q = (u16int*)pic + (x + y * 256) * 3;
q[0] = u.w;
q[1] = u.w;
q[2] = u.w;
}
}
static int
window(int n)
{
int a, w1, w2;
a = reg[0x2123 + (n >> 1)];
if((n & 1) != 0)
a >>= 4;
if((a & (WIN1|WIN2)) == 0)
return 0;
w1 = rx >= reg[0x2126] && rx <= reg[0x2127];
w2 = rx >= reg[0x2128] && rx <= reg[0x2129];
if((a & INVW1) != 0)
w1 = !w1;
if((a & INVW2) != 0)
w2 = !w2;
if((a & (WIN1|WIN2)) != (WIN1|WIN2))
return (a & WIN1) != 0 ? w1 : w2;
a = reg[0x212a + (n >> 2)] >> ((n & 3) << 1);
switch(a & 3){
case 1: return w1 & w2;
case 2: return w1 ^ w2;
case 3: return w1 ^ w2 ^ 1;
}
return w1 | w2;
}
static void
npixel(int n, int v, int pri)
{
int a;
a = 1<<n;
if((reg[TM] & a) != 0 && pri > pixelpri[0] && ((reg[TMW] & a) == 0 || !window(n))){
pixelcol[0] = v;
pixelpri[0] = pri;
}
if((reg[TS] & a) != 0 && pri > pixelpri[1] && ((reg[TSW] & a) == 0 || !window(n))){
pixelcol[1] = v;
pixelpri[1] = pri;
}
}
static void
spixel(int n, int v, int pri)
{
int a;
a = 1<<n;
if((reg[TS] & a) != 0 && pri > pixelpri[1] && ((reg[TSW] & a) == 0 || !window(n))){
pixelcol[1] = v;
pixelpri[1] = pri;
}
}
static void
mpixel(int n, int v, int pri)
{
int a;
a = 1<<n;
if((reg[TM] & a) != 0 && pri > pixelpri[0] && ((reg[TMW] & a) == 0 || !window(n))){
pixelcol[0] = v;
pixelpri[0] = pri;
}
}
static void (*pixel)(int, int, int) = npixel;
static u16int
tile(int n, int tx, int ty)
{
int a;
u16int ta;
u16int t;
a = reg[0x2107 + n];
ta = ((a & ~3) << 9) + ((tx & 0x1f) << 1) + ((ty & 0x1f) << 6);
if((a & 1) != 0)
ta += (tx & 0x20) << 6;
if((a & 2) != 0)
ta += (ty & 0x20) << (6 + (a & 1));
t = vram[ta++];
return t | vram[ta] << 8;
}
static void
chr(int n, int nb, int w, int h, u16int t, int x, int y, u32int c[])
{
u16int a;
if(w == 16)
t += (x >> 3 ^ t >> 14) & 1;
if(h == 16){
if(y >= 8){
t += (~t >> 11) & 16;
y -= 8;
}else
t += (t >> 11) & 16;
}
if((t & 0x8000) != 0)
y = 7 - y;
a = reg[0x210b + (n >> 1)];
if((n & 1) != 0)
a >>= 4;
else
a &= 0xf;
a = (a << 13) + (t & 0x3ff) * 8 * nb + y * 2;
c[0] = vram[a++];
c[0] |= vram[a] << 8;
if(nb != 2){
a += 15;
c[0] |= vram[a++] << 16;
c[0] |= vram[a] << 24;
if(nb == 8){
a += 15;
c[1] = vram[a++];
c[1] |= vram[a] << 8;
a += 15;
c[1] |= vram[a++] << 16;
c[1] |= vram[a] << 24;
}
}
}
static int
palette(int n, int p)
{
switch(mode){
case 0:
return p << 2 | n << 5;
case 1:
if(n >= 2)
return p << 2;
case 2:
case 6:
return p << 4;
case 5:
if(n == 0)
return p << 4;
return p << 2;
case 3:
if(n != 0)
return p << 4;
case 4:
if(n != 0)
return p << 2;
if((reg[CGWSEL] & DIRCOL) != 0)
return 0x10000;
}
return 0;
}
static void
shift(u32int *c, int nb, int n, int d)
{
if(d){
c[0] >>= n;
if(nb == 8)
c[1] >>= n;
}else{
c[0] <<= n;
if(nb == 8)
c[1] <<= n;
}
}
static u8int
bgpixel(u32int *c, int nb, int d)
{
u8int v;
if(d){
v = c[0] & 1 | c[0] >> 7 & 2;
if(nb != 2){
v |= c[0] >> 14 & 4 | c[0] >> 21 & 8;
if(nb == 8){
v |= c[1] << 4 & 16 | c[1] >> 3 & 32 | c[1] >> 10 & 64 | c[1] >> 17 & 128;
c[1] >>= 1;
}
}
c[0] >>= 1;
}else{
v = c[0] >> 7 & 1 | c[0] >> 14 & 2;
if(nb != 2){
v |= c[0] >> 21 & 4 | c[0] >> 28 & 8;
if(nb == 8){
v |= c[1] >> 3 & 16 | c[1] >> 10 & 32 | c[1] >> 17 & 64 | c[1] >> 24 & 128;
c[1] <<= 1;
}
}
c[0] <<= 1;
}
return v;
}
static struct bgctxt {
u8int w, h, wsh, hsh, nb, pri[2];
u16int tx, ty, tnx, tny;
u16int t;
u32int c[2];
int pal;
u8int msz, mv, mx;
u16int otx, oty, otny;
} bgctxts[4];
static void
bginit(int n, int nb, int prilo, int prihi)
{
struct bgctxt *p;
int sx, sy;
p = bgctxts + n;
p->hsh = ((reg[BGMODE] & (1<<(4+n))) != 0) ? 4 : 3;
p->wsh = mode >= 5 ? 4 : p->hsh;
p->h = 1<<p->hsh;
p->w = 1<<p->wsh;
p->nb = nb;
p->pri[0] = prilo;
p->pri[1] = prihi;
sx = hofs[n];
sy = vofs[n] + ppuy;
if(reg[MOSAIC] != 0 && (reg[MOSAIC] & (1<<n)) != 0){
p->msz = (reg[MOSAIC] >> 4) + 1;
if(p->msz != 1){
sx -= p->mx = sx % p->msz;
sy -= sy % p->msz;
}
}else
p->msz = 1;
if(mode >= 5)
sx <<= 1;
redo:
p->tx = sx >> p->wsh;
p->tnx = sx & (p->w - 1);
p->ty = sy >> p->hsh;
p->tny = sy & (p->h - 1);
p->t = tile(n, p->tx, p->ty);
chr(n, nb, p->w, p->h, p->t, p->tnx, p->tny, p->c);
p->pal = palette(n, p->t >> 10 & 7);
if((p->tnx & 7) != 0)
shift(p->c, nb, p->tnx & 7, p->t & 0x4000);
if(p->msz != 1 && p->mx != 0 && sx % p->msz == 0){
p->mv = bgpixel(p->c, nb, p->t & 0x4000);
if(p->tnx + p->mx >= 8){
sx += p->mx;
goto redo;
}else if(p->mx > 1)
shift(p->c, nb, p->mx - 1, p->t & 0x4000);
}
}
static void
bg(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->w){
p->tx++;
p->tnx = 0;
p->t = tile(n, p->tx, p->ty);
p->pal = palette(n, p->t >> 10 & 7);
}
if((p->tnx & 7) == 0)
chr(n, p->nb, p->w, p->h, p->t, p->tnx, p->tny, p->c);
}
static void
optinit(void)
{
struct bgctxt *p;
p = bgctxts + 2;
p->hsh = (reg[BGMODE] & (1<<6)) != 0 ? 4 : 3;
p->wsh = mode >= 5 ? 4 : p->hsh;
p->w = 1<<p->wsh;
p->h = 1<<p->hsh;
p->tnx = hofs[2] & (p->w - 1);
p->tx = hofs[2] >> p->wsh;
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->w){
if(mode == 4){
hval = tile(2, p->tx, vofs[2] >> p->hsh);
if((hval & 0x8000) != 0){
vval = hval;
hval = 0;
}else
vval = 0;
}else{
hval = tile(2, p->tx, vofs[2] >> p->hsh);
vval = tile(2, p->tx, (vofs[2]+8) >> p->hsh);
}
sx = (rx & ~7) + (hval & 0x1ff8);
sy = ppuy + (vval & 0x1fff);
if((vval & 0x2000) != 0){
bgctxts[0].oty = sy >> bgctxts[0].hsh;
bgctxts[0].otny = sy & (bgctxts[0].h - 1);
}else{
bgctxts[0].oty = bgctxts[0].ty;
bgctxts[0].otny = bgctxts[0].tny;
}
if((vval & 0x4000) != 0){
bgctxts[1].oty = sy >> bgctxts[1].hsh;
bgctxts[1].otny = sy & (bgctxts[1].h - 1);
}else{
bgctxts[1].oty = bgctxts[1].ty;
bgctxts[1].otny = bgctxts[1].tny;
}
if((hval & 0x2000) != 0)
bgctxts[0].otx = sx >> bgctxts[0].wsh;
else
bgctxts[0].otx = 0xffff;
if((hval & 0x4000) != 0)
bgctxts[1].otx = sx >> bgctxts[1].wsh;
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->w){
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->w, p->h, p->t, p->tnx, p->otny, 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)
if((reg[MOSAIC] & 2) != 0)
p->msz = (reg[MOSAIC] >> 4) + 1;
else
p->msz = 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 & 0x7f) != 0)
if((v & 0x80) != 0)
pixel(1, v & 0x7f, 0x71);
else
pixel(1, v, 0x11);
}else if(v != 0)
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)
{
static int bitch[8];
pixel = npixel;
switch(mode){
case 0:
bginit(0, 2, 0x80, 0xb0);
bginit(1, 2, 0x71, 0xa1);
bginit(2, 2, 0x22, 0x52);
bginit(3, 2, 0x13, 0x43);
break;
case 1:
bginit(0, 4, 0x80, 0xb0);
bginit(1, 4, 0x71, 0xa1);
bginit(2, 2, 0x12, (reg[BGMODE] & 8) != 0 ? 0xd2 : 0x42);
break;
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 5:
bginit(0, 4, 0x40, 0xa0);
bginit(1, 2, 0x11, 0x71);
break;
case 6:
bginit(0, 4, 0x40, 0xa0);
optinit();
break;
case 7:
bg7init(0);
if((reg[SETINI] & EXTBG) != 0)
bg7init(1);
break;
default:
bgctxts[0].w = bgctxts[1].w = 0;
if(bitch[mode]++ == 0)
print("bg mode %d not implemented\n", mode);
}
}
static void
bgs(void)
{
switch(mode){
case 0:
bg(0);
bg(1);
bg(2);
bg(3);
break;
case 1:
bg(0);
bg(1);
bg(2);
break;
case 2:
case 4:
opt();
bgopt(0);
bgopt(1);
break;
case 3:
bg(0);
bg(1);
break;
case 5:
pixel = spixel;
bg(0);
bg(1);
pixel = mpixel;
bg(0);
bg(1);
pixel = npixel;
break;
case 6:
opt();
pixel = spixel;
bgopt(0);
pixel = mpixel;
bgopt(0);
pixel = npixel;
break;
case 7:
bg7(0);
if((reg[SETINI] & EXTBG) != 0)
bg7(1);
break;
}
}
static void
sprites(void)
{
static struct {
short x;
u8int y, i, c, sx, sy;
u16int t0, t1;
} s[32], *sp;
static struct {
short x;
u8int sx, i, c, pal, pri;
u32int *ch;
} t[32], *tp;
static u32int ch[34];
static u8int *p, q;
static int n, m;
static int *sz;
static int szs[] = {
8, 8, 16, 16, 8, 8, 32, 32,
8, 8, 64, 64, 16, 16, 32, 32,
16, 16, 64, 64, 32, 32, 64, 64,
16, 32, 32, 64, 16, 32, 32, 32
};
static u16int base[2];
u8int dy, v, col, pri0, pri1, prio;
u16int a;
u32int w, *cp;
int i, nt, dx;
if(rx == 0){
n = 0;
sp = s;
sz = szs + ((reg[OBSEL] & 0xe0) >> 3);
base[0] = (reg[OBSEL] & 0x07) << 14;
base[1] = base[0] + (((reg[OBSEL] & 0x18) + 8) << 10);
}
if((rx & 1) == 0){
p = oam + 2 * rx;
if(p[1] == 0xf0)
goto nope;
q = (oam[512 + (rx >> 3)] >> (rx & 6)) & 3;
dy = ppuy - p[1];
sp->sx = sz[q & 2];
sp->sy = sz[(q & 2) + 1];
if(dy >= sp->sy)
goto nope;
sp->x = p[0];
if((q & 1) != 0)
sp->x |= 0xff00;
if(sp->x <= -(short)sp->sx && sp->x != -256)
goto nope;
if(n == 32){
reg[0x213e] |= 0x40;
goto nope;
}
sp->i = rx >> 1;
sp->y = p[1];
sp->c = p[3];
sp->t0 = p[2] << 5;
sp->t1 = base[sp->c & 1];
sp++;
n++;
}
nope:
if(ppuy != 0){
col = 0;
pri0 = 0;
pri1 = 128;
if((reg[OAMADDH] & 0x80) != 0)
prio = oamaddr >> 2;
else
prio = 0;
for(i = 0, tp = t; i < m; i++, tp++){
dx = rx - tp->x;
if(dx < 0 || dx >= tp->sx)
continue;
w = *tp->ch;
if((tp->c & 0x40) != 0){
v = w & 1 | w >> 7 & 2 | w >> 14 & 4 | w >> 21 & 8;
*tp->ch = w >> 1;
}else{
v = w >> 7 & 1 | w >> 14 & 2 | w >> 21 & 4 | w >> 28 & 8;
*tp->ch = w << 1;
}
if((dx & 7) == 7)
tp->ch++;
nt = (tp->i - prio) & 0x7f;
if(v != 0 && nt < pri1){
col = tp->pal + v;
pri0 = tp->pri;
pri1 = nt;
}
}
if(col > 0)
pixel(OBJ, col, pri0);
}
if(rx == 255){
cp = ch;
m = n;
for(sp = s + n - 1, tp = t + n - 1; sp >= s; sp--, tp--){
tp->x = sp->x;
tp->sx = 0;
tp->c = sp->c;
tp->pal = 0x80 | sp->c << 3 & 0x70;
tp->pri = 3 * (0x10 + (sp->c & 0x30));
if((tp->c & 8) != 0)
tp->pri |= OBJ;
else
tp->pri |= OBJNC;
tp->ch = cp;
tp->i = sp->i;
nt = sp->sx >> 3;
dy = ppuy - sp->y;
if((sp->c & 0x80) != 0)
dy = sp->sy - 1 - dy;
a = sp->t0 | (dy & 7) << 1;
if(dy >= 8)
a += (dy & ~7) << 6;
if(sp->x < 0 && (i = (-sp->x >> 3)) != 0){
if((sp->c & 0x40) != 0)
a -= i << 5;
else
a += i << 5;
nt -= i;
tp->sx += i << 3;
}
if((sp->c & 0x40) != 0){
a += sp->sx * 4;
for(i = 0; i < nt; i++){
if(cp < ch + nelem(ch)){
w = vram[sp->t1 | (a -= 16) & 0x1fff] << 16;
w |= vram[sp->t1 | (a + 1) & 0x1fff] << 24;
w |= vram[sp->t1 | (a -= 16) & 0x1fff] << 0;
w |= vram[sp->t1 | (a + 1) & 0x1fff] << 8;
*cp++ = w;
tp->sx += 8;
}else
reg[0x213e] |= 0x80;
}
}else
for(i = 0; i < nt; i++){
if(cp < ch + nelem(ch)){
w = vram[sp->t1 | a & 0x1fff];
w |= vram[sp->t1 | ++a & 0x1fff] << 8;
w |= vram[sp->t1 | (a += 15) & 0x1fff] << 16;
w |= vram[sp->t1 | ++a & 0x1fff] << 24;
*cp++ = w;
tp->sx += 8;
a += 15;
}else
reg[0x213e] |= 0x80;
}
if(sp->x < 0 && (i = (-sp->x) & 7) != 0)
if((sp->c & 0x40) != 0)
*tp->ch >>= i;
else
*tp->ch <<= i;
}
}
}
static u16int
colormath(int n)
{
u16int v, w, r, g, b;
u8int m, m2, div;
int cw;
m = reg[CGWSEL];
m2 = reg[CGADSUB];
cw = -1;
switch(m >> 6){
default: v = 1; break;
case 1: v = cw = window(COL); break;
case 2: v = !(cw = window(COL)); break;
case 3: v = 0; break;
}
if(v){
if((pixelcol[n] & 0x10000) != 0)
v = pixelcol[n];
else
v = cgram[pixelcol[n] & 0xff];
}
if((m2 & (1 << (pixelpri[n] & 0xf))) == 0)
return v;
switch((m >> 4) & 3){
case 0: break;
case 1: if(cw < 0) cw = window(COL); if(!cw) return v; break;
case 2: if(cw < 0) cw = window(COL); if(cw) return v; break;
default: return v;
}
div = (m2 & 0x40) != 0;
if((m & 2) != 0){
if((pixelcol[1-n] & 0x10000) != 0)
w = pixelcol[1-n];
else
w = cgram[pixelcol[1-n] & 0xff];
div = div && (pixelpri[1-n] & 0xf) != COL;
}else
w = subcolor;
if((m2 & 0x80) != 0){
r = (v & 0x7c00) - (w & 0x7c00);
g = (v & 0x03e0) - (w & 0x03e0);
b = (v & 0x001f) - (w & 0x001f);
if(r > 0x7c00) r = 0;
if(g > 0x03e0) g = 0;
if(b > 0x001f) b = 0;
if(div){
r = (r >> 1) & 0xfc00;
g = (g >> 1) & 0xffe0;
b >>= 1;
}
return r | g | b;
}else{
r = (v & 0x7c00) + (w & 0x7c00);
g = (v & 0x03e0) + (w & 0x03e0);
b = (v & 0x001f) + (w & 0x001f);
if(div){
r = (r >> 1) & 0xfc00;
g = (g >> 1) & 0xffe0;
b >>= 1;
}
if(r > 0x7c00) r = 0x7c00;
if(g > 0x03e0) g = 0x03e0;
if(b > 0x001f) b = 0x001f;
return r | g | b;
}
}
void
ppustep(void)
{
int yvbl;
mode = reg[BGMODE] & 7;
bright = reg[INIDISP] & 0xf;
hires = mode >= 5 && mode < 7 || (reg[SETINI] & 8) != 0;
yvbl = (reg[SETINI] & OVERSCAN) != 0 ? 0xf0 : 0xe1;
if(ppux >= XLEFT && ppux <= XRIGHT && ppuy < 0xf0){
rx = ppux - XLEFT;
if(ppuy < yvbl && (reg[INIDISP] & 0x80) == 0){
pixelcol[0] = 0;
pixelpri[0] = COL;
pixelcol[1] = 0x10000 | subcolor;
pixelpri[1] = COL;
bgs();
sprites();
if(ppuy != 0)
if(hires){
pixeldraw(rx, ppuy - 1, colormath(1), 0);
pixeldraw(rx, ppuy - 1, colormath(0), 1);
}else
pixeldraw(rx, ppuy - 1, colormath(0), 0);
}else if(ppuy != 0)
pixeldraw(rx, ppuy - 1, ppuy >= yvbl ? 0x6739 : 0, -1);
}
if(ppux == 134)
cpupause = 1;
if(ppux == 0x116 && ppuy <= yvbl)
hdma |= reg[0x420c];
if((reg[NMITIMEN] & HCNTIRQ) != 0 && htime+4 == ppux && ((reg[NMITIMEN] & VCNTIRQ) == 0 || vtime == ppuy))
irq |= IRQPPU;
if(++ppux >= 340){
ppux = 0;
if(++ppuy >= 262){
ppuy = 0;
reg[RDNMI] &= ~VBLANK;
reg[0x213e] = 1;
reg[0x213f] ^= 0x80;
hdma = reg[0x420c]<<8;
flush();
}
if(ppuy < yvbl)
bgsinit();
if(ppuy == yvbl){
reg[RDNMI] |= VBLANK;
if((reg[NMITIMEN] & VBLANK) != 0)
nmi = 2;
if((reg[INIDISP] & 0x80) == 0)
oamaddr = reg[0x2102] << 1 | (reg[0x2103] & 1) << 9;
if((reg[NMITIMEN] & AUTOJOY) != 0){
memwrite(0x4016, 1);
memwrite(0x4016, 0);
reg[0x4218] = keylatch >> 16;
reg[0x4219] = keylatch >> 24;
keylatch = keylatch << 16 | 0xffff;
}
}
if((reg[NMITIMEN] & (HCNTIRQ|VCNTIRQ)) == VCNTIRQ && vtime == ppuy)
irq |= IRQPPU;
}
}