commit 6a52595

Returned pre-computed table..

 1@@ -427,23 +427,23 @@ static int screen_vector, *screen_pixels, screen_palette[16];
 2 static int rX, rY, rA, rMX, rMY, rMA, rML, rDX, rDY;
 3 static Uint8 *screen_layers;
 4 
 5-static const Uint8 blend_lut[16][4] = {
 6-	{0, 0, 1, 2},
 7-	{0, 1, 2, 3},
 8-	{0, 2, 3, 1},
 9-	{0, 3, 1, 2},
10-	{1, 0, 1, 2},
11-	{1, 1, 2, 3},
12-	{1, 2, 3, 1},
13-	{1, 3, 1, 2},
14-	{2, 0, 1, 2},
15-	{2, 1, 2, 3},
16-	{2, 2, 3, 1},
17-	{2, 3, 1, 2},
18-	{3, 0, 1, 2},
19-	{3, 1, 2, 3},
20-	{3, 2, 3, 1},
21-	{3, 3, 1, 2}};
22+static const Uint8 blend_lut[16][2][4] = {
23+	{{0, 0, 1, 2}, {0, 0, 4, 8}},
24+	{{0, 1, 2, 3}, {0, 4, 8, 12}},
25+	{{0, 2, 3, 1}, {0, 8, 12, 4}},
26+	{{0, 3, 1, 2}, {0, 12, 4, 8}},
27+	{{1, 0, 1, 2}, {4, 0, 4, 8}},
28+	{{1, 1, 2, 3}, {4, 4, 8, 12}},
29+	{{1, 2, 3, 1}, {4, 8, 12, 4}},
30+	{{1, 3, 1, 2}, {4, 12, 4, 8}},
31+	{{2, 0, 1, 2}, {8, 0, 4, 8}},
32+	{{2, 1, 2, 3}, {8, 4, 8, 12}},
33+	{{2, 2, 3, 1}, {8, 8, 12, 4}},
34+	{{2, 3, 1, 2}, {8, 12, 4, 8}},
35+	{{3, 0, 1, 2}, {12, 0, 4, 8}},
36+	{{3, 1, 2, 3}, {12, 4, 8, 12}},
37+	{{3, 2, 3, 1}, {12, 8, 12, 4}},
38+	{{3, 3, 1, 2}, {12, 12, 4, 8}}};
39 
40 void emu_redraw(void), emu_resize(void);
41 
42@@ -601,13 +601,13 @@ screen_deo_sprite(void)
43 	const int dx = flipx ? -rDY : rDY, dy = flipy ? -rDX : rDX;
44 	const int row_start = flipx ? 0 : 7, row_delta = flipx ? 1 : -1;
45 	const int col_start = flipy ? 7 : 0, col_delta = flipy ? -1 : 1;
46-	const int layer = ctrl & 0x40 ? 2 : 0, layer_mask = layer ? 0x3 : 0xc;
47+	const int layer = ctrl & 0x40, layer_mask = layer ? 0x3 : 0xc;
48 	const int is_2bpp = ctrl & 0x80;
49 	const int addr_incr = rMA << (is_2bpp ? 2 : 1);
50 	const int stride = screen_wmar2;
51 	const int blend = ctrl & 0xf;
52 	const Uint8 opaque_mask = (blend % 5) ? 0xff : 0x00;
53-	const Uint8 *table = blend_lut[blend];
54+	const Uint8 *table = blend_lut[blend][layer >> 6];
55 	for(i = 0; i <= rML; i++, x += dx, y += dy, rA += addr_incr) {
56 		const Uint16 x0 = x + 8, y0 = y + 8;
57 		if(x0 + 8 >= stride || y0 + 8 >= screen_hmar2) continue;
58@@ -620,8 +620,7 @@ screen_deo_sprite(void)
59 				const int bit = 1 << row;
60 				const int color = ((ch1 & bit) ? 1 : 0) | ((ch2 & (bit << 1)) ? 2 : 0);
61 				const Uint8 mask = -(!!(color | opaque_mask));
62-				const Uint8 value = table[color] << layer;
63-				*d = (*d & ~mask) | (((*d & layer_mask) | value) & mask);
64+				*d = (*d & ~mask) | (((*d & layer_mask) | table[color]) & mask);
65 			}
66 		}
67 	}