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Drawing is pixel-perfect again

This commit is contained in:
neauoire 2021-09-29 20:54:27 -07:00
parent bac54f1fd9
commit c494e42cf2
2 changed files with 16 additions and 9 deletions
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24
src/devices/ppu.c
View File

@ -24,12 +24,6 @@ static Uint8 blending[5][16] = {
{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2},
{1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0}};
static Uint16
ppu_row(Ppu *p, Uint16 x, Uint16 y)
{
return (y % 8) + ((x / 8 + y / 8 * p->width / 8) * 16);
}
static void
ppu_clear(Ppu *p)
{
@ -46,9 +40,22 @@ Uint8
ppu_read(Ppu *p, Uint16 x, Uint16 y)
{
int row = (x + y * p->width) / 0x2;
int shift = (1 - (x & 0x1)) * 0x4;
return p->pixels[row] & 0x3;
if(x % 2) {
if(p->pixels[row] & 0x0c) {
return (p->pixels[row] >> 0x2) & 0x3;
} else {
return (p->pixels[row] >> 0x0) & 0x3;
}
} else {
if(p->pixels[row] & 0xc0) {
return (p->pixels[row] >> 0x6) & 0x3;
} else {
return (p->pixels[row] >> 0x4) & 0x3;
}
}
return 0;
}
void
@ -65,6 +72,7 @@ ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)
next |= color << (4 + (layer * 2));
}
p->pixels[row] = next;
p->reqdraw = 1;
}
void

1
src/uxnemu.c
View File

@ -410,7 +410,6 @@ screen_talk(Device *d, Uint8 b0, Uint8 w)
}
if(d->dat[0x6] & 0x01) poke16(d->dat, 0x8, x + 8); /* auto x+8 */
if(d->dat[0x6] & 0x02) poke16(d->dat, 0xa, y + 8); /* auto y+8 */
ppu.reqdraw = 1;
break;
}
}