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(screen.c) Faster sprite drawing

This commit is contained in:
neauoire 2023-08-05 09:59:25 -07:00
parent 9737391b9f
commit 0446dcaaa3
1 changed files with 6 additions and 4 deletions
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10
src/devices/screen.c
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@ -185,16 +185,18 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
Uint8 length = move >> 4;
Uint8 twobpp = !!(ctrl & 0x80);
Uint8 *layer = (ctrl & 0x40) ? uxn_screen.fg : uxn_screen.bg;
Uint8 color = ctrl & 0xf;
Uint16 x = PEEK2(d + 0x8), dx = (move & 0x1) << 3;
Uint16 y = PEEK2(d + 0xa), dy = (move & 0x2) << 2;
Uint16 addr = PEEK2(d + 0xc);
Uint16 addr = PEEK2(d + 0xc), addr_incr = (move & 0x4) << (1 + twobpp);
int flipx = (ctrl & 0x10), fx = flipx ? -1 : 1;
int flipy = (ctrl & 0x20), fy = flipy ? -1 : 1;
Uint16 dyx = dy * fx, dxy = dx * fy;
for(i = 0; i <= length; i++) {
screen_blit(layer, ram, addr, x + dy * i * fx, y + dx * i * fy, ctrl & 0xf, flipx, flipy, twobpp);
addr += (move & 0x4) << (1 + twobpp);
screen_blit(layer, ram, addr, x + dyx * i, y + dxy * i, color, flipx, flipy, twobpp);
addr += addr_incr;
}
screen_change(x, y, x + dy * length * fx + 8, y + dx * length * fy + 8);
screen_change(x, y, x + dyx * length + 8, y + dxy * length + 8);
if(move & 0x1) POKE2(d + 0x8, x + dx * fx); /* auto x+8 */
if(move & 0x2) POKE2(d + 0xa, y + dy * fy); /* auto y+8 */
if(move & 0x4) POKE2(d + 0xc, addr); /* auto addr+length */