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(screen) Cache the content of the auto byte

This commit is contained in:
Devine Lu Linvega 2024-01-03 09:19:09 -08:00
parent 011662e1dd
commit 22af2ba9c3
1 changed files with 17 additions and 25 deletions
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42
src/devices/screen.c
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@ -198,9 +198,9 @@ screen_redraw(Uxn *u)
pixels[i] = palette[fg[i] << 2 | bg[i]]; pixels[i] = palette[fg[i] << 2 | bg[i]];
} }
/* cache */ /* screen registers */
static Uint16 rX, rY, rA, rMX, rMY, rMA, rML; static Uint16 rX, rY, rA, rMX, rMY, rMA, rML, rDX, rDY;
Uint8 Uint8
screen_dei(Uxn *u, Uint8 addr) screen_dei(Uxn *u, Uint8 addr)
@ -223,17 +223,16 @@ screen_dei(Uxn *u, Uint8 addr)
void void
screen_deo(Uint8 *ram, Uint8 *d, Uint8 port) screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
{ {
Uint16 dx, dy, dxy, dyx, addr_incr;
switch(port) { switch(port) {
case 0x3: screen_resize(PEEK2(d + 2), uxn_screen.height); break; case 0x3: screen_resize(PEEK2(d + 2), uxn_screen.height); return;
case 0x5: screen_resize(uxn_screen.width, PEEK2(d + 4)); break; case 0x5: screen_resize(uxn_screen.width, PEEK2(d + 4)); return;
case 0x6: rMX = d[0x6] & 0x1, rMY = d[0x6] & 0x2, rMA = d[0x6] & 0x4, rML = d[0x6] >> 4; break; case 0x6: rMX = d[0x6] & 0x1, rMY = d[0x6] & 0x2, rMA = d[0x6] & 0x4, rML = d[0x6] >> 4, rDX = rMX << 3, rDY = rMY << 2; return;
case 0x8: case 0x8:
case 0x9: rX = (d[0x8] << 8) | d[0x9]; break; case 0x9: rX = (d[0x8] << 8) | d[0x9]; return;
case 0xa: case 0xa:
case 0xb: rY = (d[0xa] << 8) | d[0xb]; break; case 0xb: rY = (d[0xa] << 8) | d[0xb]; return;
case 0xc: case 0xc:
case 0xd: rA = (d[0xc] << 8) | d[0xd]; break; case 0xd: rA = (d[0xc] << 8) | d[0xd]; return;
case 0xe: { case 0xe: {
Uint8 ctrl = d[0xe]; Uint8 ctrl = d[0xe];
Uint8 color = ctrl & 0x3; Uint8 color = ctrl & 0x3;
@ -261,7 +260,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
if(rMX) rX++; if(rMX) rX++;
if(rMY) rY++; if(rMY) rY++;
} }
break; return;
} }
case 0xf: { case 0xf: {
Uint8 i; Uint8 i;
@ -271,24 +270,17 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
Uint8 *layer = ctrl & 0x40 ? uxn_screen.fg : uxn_screen.bg; Uint8 *layer = ctrl & 0x40 ? uxn_screen.fg : uxn_screen.bg;
int fx = ctrl & 0x10 ? -1 : 1; int fx = ctrl & 0x10 ? -1 : 1;
int fy = ctrl & 0x20 ? -1 : 1; int fy = ctrl & 0x20 ? -1 : 1;
dx = rMX << 3, dxy = dx * fy; Uint16 dxy = rDX * fy, dyx = rDY * fx, addr_incr = rMA << (1 + twobpp);
dy = rMY << 2, dyx = dy * fx; if(twobpp)
addr_incr = rMA << (1 + twobpp); for(i = 0; i <= rML; i++, rA += addr_incr)
if(twobpp) {
for(i = 0; i <= rML; i++) {
screen_2bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy); screen_2bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy);
rA += addr_incr; else
} for(i = 0; i <= rML; i++, rA += addr_incr)
} else {
for(i = 0; i <= rML; i++) {
screen_1bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy); screen_1bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy);
rA += addr_incr;
}
}
screen_change(rX, rY, rX + dyx * rML + 8, rY + dxy * rML + 8); screen_change(rX, rY, rX + dyx * rML + 8, rY + dxy * rML + 8);
if(rMX) rX += dx * fx; if(rMX) rX += rDX * fx;
if(rMY) rY += dy * fy; if(rMY) rY += rDY * fy;
break; return;
} }
} }
} }