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(screen.c) Inlined sprite drawing function

This commit is contained in:
neauoire 2023-08-05 10:31:22 -07:00
parent 789fb0cd8b
commit 222246748e
1 changed files with 15 additions and 20 deletions
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35
src/devices/screen.c
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@ -46,24 +46,6 @@ screen_fill(Uint8 *layer, int x1, int y1, int x2, int y2, int color)
layer[x + y * width] = color;
}
static void
screen_blit(Uint8 *layer, Uint8 *ram, Uint16 addr, int x1, int y1, int color, int flipx, int flipy, int twobpp)
{
int v, h, width = uxn_screen.width, height = uxn_screen.height, opaque = (color % 5);
for(v = 0; v < 8; v++) {
Uint16 c = ram[(addr + v) & 0xffff] | (twobpp ? (ram[(addr + v + 8) & 0xffff] << 8) : 0);
Uint16 y = y1 + (flipy ? 7 - v : v);
for(h = 7; h >= 0; --h, c >>= 1) {
Uint8 ch = (c & 1) | ((c >> 7) & 2);
if(opaque || ch) {
Uint16 x = x1 + (flipx ? 7 - h : h);
if(x < width && y < height)
layer[x + y * width] = blending[ch][color];
}
}
}
}
void
screen_palette(Uint8 *addr)
{
@ -185,15 +167,28 @@ 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;
Uint8 color = ctrl & 0xf, opaque = color % 5;
Uint16 x = PEEK2(d + 0x8), dx = (move & 0x1) << 3;
Uint16 y = PEEK2(d + 0xa), dy = (move & 0x2) << 2;
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;
int v, h, width = uxn_screen.width, height = uxn_screen.height;
Uint16 dyx = dy * fx, dxy = dx * fy;
for(i = 0; i <= length; i++) {
screen_blit(layer, ram, addr, x + dyx * i, y + dxy * i, color, flipx, flipy, twobpp);
Uint16 x1 = x + dyx * i, y1 = y + dxy * i;
for(v = 0; v < 8; v++) {
Uint16 c = ram[(addr + v) & 0xffff] | (twobpp ? (ram[(addr + v + 8) & 0xffff] << 8) : 0);
Uint16 y = y1 + (flipy ? 7 - v : v);
for(h = 7; h >= 0; --h, c >>= 1) {
Uint8 ch = (c & 1) | ((c >> 7) & 2);
if(opaque || ch) {
Uint16 x = x1 + (flipx ? 7 - h : h);
if(x < width && y < height)
layer[x + y * width] = blending[ch][color];
}
}
}
addr += addr_incr;
}
screen_change(x, y, x + dyx * length + 8, y + dxy * length + 8);