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(screen.c) Always cache value before PEEK/POKE

This commit is contained in:
neauoire 2023-08-30 12:06:04 -07:00
parent f4caad2d51
commit 3b526bbed6
1 changed files with 30 additions and 14 deletions
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44
src/devices/screen.c
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@ -180,19 +180,25 @@ screen_dei(Uxn *u, Uint8 addr)
void
screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
{
Uint8 *port_width, *port_height, *port_x, *port_y, *port_addr;
Uint16 x, y, dx, dy, dxy, dyx, addr, addr_incr;
switch(port) {
case 0x3:
screen_resize(PEEK2(d + 2), uxn_screen.height);
port_width = d + 0x2;
screen_resize(PEEK2(port_width), uxn_screen.height);
break;
case 0x5:
screen_resize(uxn_screen.width, PEEK2(d + 4));
port_height = d + 0x4;
screen_resize(uxn_screen.width, PEEK2(port_height));
break;
case 0xe: {
Uint8 ctrl = d[0xe];
Uint8 color = ctrl & 0x3;
Uint16 x = PEEK2(d + 0x8);
Uint16 y = PEEK2(d + 0xa);
Uint8 *layer = (ctrl & 0x40) ? uxn_screen.fg : uxn_screen.bg;
port_x = d + 0x8;
port_y = d + 0xa;
x = PEEK2(port_x);
y = PEEK2(port_y);
/* fill mode */
if(ctrl & 0x80) {
Uint16 x2 = uxn_screen.width;
@ -208,9 +214,11 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
Uint16 height = uxn_screen.height;
if(x < width && y < height)
layer[x + y * width] = color;
screen_change(x, y, x + 1, y + 1);
if(d[0x6] & 0x1) POKE2(d + 0x8, x + 1); /* auto x+1 */
if(d[0x6] & 0x2) POKE2(d + 0xa, y + 1); /* auto y+1 */
x += 1;
y += 1;
screen_change(x, y, x, y);
if(d[0x6] & 0x1) POKE2(port_x, x);
if(d[0x6] & 0x2) POKE2(port_y, y);
}
break;
}
@ -222,20 +230,28 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
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), 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;
port_x = d + 0x8;
port_y = d + 0xa;
port_addr = d + 0xc;
x = PEEK2(port_x), dx = (move & 0x1) << 3, dxy = dx * fy;
y = PEEK2(port_y), dy = (move & 0x2) << 2, dyx = dy * fx;
addr = PEEK2(port_addr), addr_incr = (move & 0x4) << (1 + twobpp);
for(i = 0; i <= length; i++) {
screen_blit(layer, ram, addr, x + dyx * i, y + dxy * i, color, flipx, flipy, twobpp);
addr += addr_incr;
}
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 */
if(move & 0x1) {
x = x + dx * fx;
POKE2(port_x, x);
}
if(move & 0x2) {
y = y + dy * fy;
POKE2(port_y, y);
}
if(move & 0x4) POKE2(port_addr, addr); /* auto addr+length */
break;
}
}