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Simpler putchr(), not the best but..

This commit is contained in:
neauoire 2021-07-31 17:00:25 -07:00
parent b327719e38
commit 8a8de7f142
1 changed files with 9 additions and 14 deletions
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15
src/devices/ppu.c
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@ -16,9 +16,8 @@ void
clear(Ppu *p)
{
int i, sz = p->height * p->width;
for(i = 0; i < sz; ++i) {
p->pixels[i] = 0;
}
for(i = 0; i < sz; ++i)
p->pixels[i] = 0x00;
}
void
@ -41,28 +40,24 @@ puticn(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
ch1 ? color % 4 : color / 4);
ch1 ? (color & 0x3) : (color >> 0x2));
}
}
void
putchr(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
{
Uint8 k1 = 1, k2 = 2;
Uint16 v, h;
if(!(color & 1)) {
++color;
k1 = 2, k2 = 1;
}
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1) * color;
Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1) * color;
if(ch1 + ch2 || (color != 0x05 && color != 0x0a && color != 0x0f))
putpixel(p,
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
((ch1 * k1 + ch2 * k2) + color / 4) & 0x3);
((ch1 ? (color & 0x3) : (color >> 0x2)) + (ch2 ? (color & 0x3) : (color >> 0x2)) * 2) & 0x3);
}
}