uxn

commit 011662e1dd3e5544320fef5ec498c3ca086e8601
parent 163d48ec343ab373182ee9075667c2e5f0185a5f
Author: Devine Lu Linvega <aliceffekt@gmail.com>
Date:   Wed,  3 Jan 2024 09:05:16 -0800

(screen) cache elements of the auto byte

Diffstat:
M
src/devices/screen.c
 | 
26
++++++++++++--------------

1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/src/devices/screen.c b/src/devices/screen.c
@@ -200,7 +200,7 @@ screen_redraw(Uxn *u)
 
 /* cache */
 
-static Uint16 rX, rY, rA;
+static Uint16 rX, rY, rA, rMX, rMY, rMA, rML;
 
 Uint8
 screen_dei(Uxn *u, Uint8 addr)
@@ -227,6 +227,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
 	switch(port) {
 	case 0x3: screen_resize(PEEK2(d + 2), uxn_screen.height); break;
 	case 0x5: screen_resize(uxn_screen.width, PEEK2(d + 4)); break;
+	case 0x6: rMX = d[0x6] & 0x1, rMY = d[0x6] & 0x2, rMA = d[0x6] & 0x4, rML = d[0x6] >> 4; break;
 	case 0x8:
 	case 0x9: rX = (d[0x8] << 8) | d[0x9]; break;
 	case 0xa:
@@ -253,43 +254,40 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
 		}
 		/* pixel mode */
 		else {
-			Uint8 move = d[0x6];
 			Uint16 w = uxn_screen.width;
 			if(rX < w && rY < uxn_screen.height)
 				layer[rX + rY * w] = color;
 			screen_change(rX, rY, rX + 1, rY + 1);
-			if(move & 0x1) rX++;
-			if(move & 0x2) rY++;
+			if(rMX) rX++;
+			if(rMY) rY++;
 		}
 		break;
 	}
 	case 0xf: {
 		Uint8 i;
 		Uint8 ctrl = d[0xf];
-		Uint8 move = d[0x6];
-		Uint8 length = move >> 4;
 		Uint8 twobpp = !!(ctrl & 0x80);
 		Uint8 color = ctrl & 0xf;
 		Uint8 *layer = ctrl & 0x40 ? uxn_screen.fg : uxn_screen.bg;
 		int fx = ctrl & 0x10 ? -1 : 1;
 		int fy = ctrl & 0x20 ? -1 : 1;
-		dx = (move & 0x1) << 3, dxy = dx * fy;
-		dy = (move & 0x2) << 2, dyx = dy * fx;
-		addr_incr = (move & 0x4) << (1 + twobpp);
+		dx = rMX << 3, dxy = dx * fy;
+		dy = rMY << 2, dyx = dy * fx;
+		addr_incr = rMA << (1 + twobpp);
 		if(twobpp) {
-			for(i = 0; i <= length; i++) {
+			for(i = 0; i <= rML; i++) {
 				screen_2bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy);
 				rA += addr_incr;
 			}
 		} else {
-			for(i = 0; i <= length; i++) {
+			for(i = 0; i <= rML; i++) {
 				screen_1bpp(layer, &ram[rA], rX + dyx * i, rY + dxy * i, color, fx, fy);
 				rA += addr_incr;
 			}
 		}
-		screen_change(rX, rY, rX + dyx * length + 8, rY + dxy * length + 8);
-		if(move & 0x1) rX += dx * fx;
-		if(move & 0x2) rY += dy * fy;
+		screen_change(rX, rY, rX + dyx * rML + 8, rY + dxy * rML + 8);
+		if(rMX) rX += dx * fx;
+		if(rMY) rY += dy * fy;
 		break;
 	}
 	}