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(screen.c) Less indirections

This commit is contained in:
Devine Lu Linvega 2023-04-14 10:33:51 -07:00
parent 04096fc172
commit da59482765
1 changed files with 22 additions and 26 deletions
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46
src/devices/screen.c
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@ -25,27 +25,29 @@ static Uint8 blending[4][16] = {
{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2}};
static void
screen_fill(UxnScreen *p, Layer *layer, Uint16 x1, Uint16 y1, Uint16 x2, Uint16 y2, Uint8 color)
screen_fill(UxnScreen *s, Uint8 *pixels, Uint16 x1, Uint16 y1, Uint16 x2, Uint16 y2, Uint8 color)
{
int x, y;
for(y = y1; y < y2 && y < p->height; y++)
for(x = x1; x < x2 && x < p->width; x++)
layer->pixels[x + y * p->width] = color;
int x, y, width = s->width, height = s->height;
for(y = y1; y < y2 && y < height; y++)
for(x = x1; x < x2 && x < width; x++)
pixels[x + y * width] = color;
}
static void
screen_blit(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy, Uint8 twobpp)
screen_blit(UxnScreen *s, Uint8 *pixels, Uint16 x1, Uint16 y1, Uint8 *ram, Uint16 addr, Uint8 color, Uint8 flipx, Uint8 flipy, Uint8 twobpp)
{
int v, h, opaque = (color % 5) || !color;
int v, h, width = s->width, height = s->height, opaque = (color % 5) || !color;
if(!color)
return screen_fill(s, pixels, x1, y1, x1 + 8, y1 + 8, 0);
for(v = 0; v < 8; v++) {
Uint16 c = sprite[v] | (twobpp ? (sprite[v + 8] << 8) : 0);
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 xx = x + (flipx ? 7 - h : h);
Uint16 yy = y + (flipy ? 7 - v : v);
if(xx < p->width && yy < p->height)
layer->pixels[xx + yy * p->width] = blending[ch][color];
Uint16 x = x1 + (flipx ? 7 - h : h);
if(x < width && y < height)
pixels[x + y * width] = blending[ch][color];
}
}
}
@ -83,18 +85,19 @@ screen_resize(UxnScreen *p, Uint16 width, Uint16 height)
p->pixels = pixels;
p->width = width;
p->height = height;
screen_fill(p, &p->bg, 0, 0, p->width, p->height, 0);
screen_fill(p, &p->fg, 0, 0, p->width, p->height, 0);
screen_fill(p, p->bg.pixels, 0, 0, p->width, p->height, 0);
screen_fill(p, p->fg.pixels, 0, 0, p->width, p->height, 0);
}
void
screen_redraw(UxnScreen *p)
{
Uint32 i, size = p->width * p->height, palette[16];
Uint32 i, size = p->width * p->height, palette[16], *pixels = p->pixels;
Uint8 *fg = p->fg.pixels, *bg = p->bg.pixels;
for(i = 0; i < 16; i++)
palette[i] = p->palette[(i >> 2) ? (i >> 2) : (i & 3)];
for(i = 0; i < size; i++)
p->pixels[i] = palette[p->fg.pixels[i] << 2 | p->bg.pixels[i]];
pixels[i] = palette[fg[i] << 2 | bg[i]];
p->fg.changed = p->bg.changed = 0;
}
@ -132,7 +135,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
Uint16 y2 = uxn_screen.height;
if(ctrl & 0x10) x2 = x, x = 0;
if(ctrl & 0x20) y2 = y, y = 0;
screen_fill(&uxn_screen, layer, x, y, x2, y2, color);
screen_fill(&uxn_screen, layer->pixels, x, y, x2, y2, color);
layer->changed = 1;
}
/* pixel mode */
@ -159,17 +162,10 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
Uint16 dx = (move & 0x1) << 3;
Uint16 dy = (move & 0x2) << 2;
Layer *layer = (ctrl & 0x40) ? &uxn_screen.fg : &uxn_screen.bg;
if(addr > 0x10000 - ((length + 1) << (3 + twobpp)))
return;
for(i = 0; i <= length; i++) {
if(!(ctrl & 0xf)) {
Uint16 ex = x + dy * i, ey = y + dx * i;
screen_fill(&uxn_screen, layer, ex, ey, ex + 8, ey + 8, 0);
} else {
screen_blit(&uxn_screen, layer, x + dy * i, y + dx * i, &ram[addr], ctrl & 0xf, ctrl & 0x10, ctrl & 0x20, twobpp);
screen_blit(&uxn_screen, layer->pixels, x + dy * i, y + dx * i, ram, addr, ctrl & 0xf, ctrl & 0x10, ctrl & 0x20, twobpp);
addr += (move & 0x04) << (1 + twobpp);
}
}
layer->changed = 1;
if(move & 0x1) POKE2(d + 0x8, x + dx); /* auto x+8 */
if(move & 0x2) POKE2(d + 0xa, y + dy); /* auto y+8 */