commit e4c539f

Removed opaque branching

 1@@ -599,6 +599,7 @@ screen_deo_sprite(void)
 2 	const int ctrl = dev[0x2f];
 3 	const int blend = ctrl & 0xf;
 4 	const int opaque = blend % 5;
 5+	const int opaque_mask = -opaque;
 6 	const int flipx = ctrl & 0x10;
 7 	const int flipy = ctrl & 0x20;
 8 	const int layer_mask = (ctrl & 0x40) ? 0x3 : 0xc;
 9@@ -617,16 +618,15 @@ screen_deo_sprite(void)
10 		if(x0 + 8 >= stride || y0 + 8 >= screen_hmar2) continue;
11 		Uint8 *dst = screen_layers + y0 * stride + x0;
12 		const Uint8 *src = &ram[rA + qfy];
13-		const Uint8 *src_end = src + 8 * src_stride;
14 		for(j = 0; j < 8; j++, dst += stride, src += src_stride) {
15 			const int ch1 = *src, ch2 = is_2bpp ? (src[8] << 1) : 0;
16 			int qx = qfx;
17 			Uint8 *d = dst;
18 			const Uint8 *d_end = dst + 8;
19 			for(; d != d_end; d++, qx += qx_step) {
20-				int color = ((ch1 >> qx) & 1) | ((ch2 >> qx) & 2);
21-				if(opaque || color)
22-					*d = (*d & layer_mask) | table[color];
23+				const int color = ((ch1 >> qx) & 1) | ((ch2 >> qx) & 2);
24+				const int write = color | opaque_mask;
25+				if(write) *d = (*d & layer_mask) | table[color];
26 			}
27 		}
28 	}