SameBoy | Accurate GB/GBC emulator |
| download: https://git.y1.nz/archives/sameboy.tar.gz | |
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Shaders/AAScale4x.fsh
1 STATIC vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
2 {
3 // texel arrangement
4 // A B C
5 // D E F
6 // G H I
7
8 vec4 B = texture_relative(image, position, vec2( 0, 1));
9 vec4 D = texture_relative(image, position, vec2( -1, 0));
10 vec4 E = texture_relative(image, position, vec2( 0, 0));
11 vec4 F = texture_relative(image, position, vec2( 1, 0));
12 vec4 H = texture_relative(image, position, vec2( 0, -1));
13 vec2 p = position * input_resolution;
14 // p = the position within a pixel [0...1]
15 p = fract(p);
16 if (p.x > .5) {
17 if (p.y > .5) {
18 // Top Right
19 return equal(B, F) && inequal(B, D) && inequal(F, H) ? F : E;
20 } else {
21 // Bottom Right
22 return equal(H, F) && inequal(D, H) && inequal(B, F) ? F : E;
23 }
24 } else {
25 if (p.y > .5) {
26 // Top Left
27 return equal(D, B) && inequal(B, F) && inequal(D, H) ? D : E;
28 } else {
29 // Bottom Left
30 return equal(D, H) && inequal(D, B) && inequal(H, F) ? D : E;
31 }
32 }
33 }
34 STATIC vec4 scale2x_wrapper(sampler2D t, vec2 pos, vec2 offset, vec2 input_resolution, vec2 output_resolution)
35 {
36 vec2 origin = (floor(pos * input_resolution * 2.0)) + vec2(0.5, 0.5);
37 return scale2x(t, (origin + offset) / input_resolution / 2.0, input_resolution, output_resolution);
38 }
39
40 STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
41 {
42 // texel arrangement
43 // A B C
44 // D E F
45 // G H I
46 vec4 B = scale2x_wrapper(image, position, vec2( 0, 1), input_resolution, output_resolution);
47 vec4 D = scale2x_wrapper(image, position, vec2( -1, 0), input_resolution, output_resolution);
48 vec4 E = scale2x_wrapper(image, position, vec2( 0, 0), input_resolution, output_resolution);
49 vec4 F = scale2x_wrapper(image, position, vec2( 1, 0), input_resolution, output_resolution);
50 vec4 H = scale2x_wrapper(image, position, vec2( 0, -1), input_resolution, output_resolution);
51
52 vec4 R;
53 vec2 p = position * input_resolution * 2.;
54 // p = the position within a pixel [0...1]
55 p = fract(p);
56 if (p.x > .5) {
57 if (p.y > .5) {
58 // Top Right
59 R = equal(B, F) && inequal(B, D) && inequal(F, H) ? F : E;
60 } else {
61 // Bottom Right
62 R = equal(H, F) && inequal(D, H) && inequal(B, F) ? F : E;
63 }
64 } else {
65 if (p.y > .5) {
66 // Top Left
67 R = equal(D, B) && inequal(B, F) && inequal(D, H) ? D : E;
68 } else {
69 // Bottom Left
70 R = equal(D, H) && inequal(D, B) && inequal(H, F) ? D : E;
71 }
72 }
73
74 return mix(R, E, 0.5);
75 }
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