SameBoy | Accurate GB/GBC emulator |
| download: https://git.y1.nz/archives/sameboy.tar.gz | |
| README | Files | Log | Refs | LICENSE |
Shaders/Bilinear.fsh
1 STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
2 {
3 vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
4
5 vec4 q11 = texture(image, (floor(pixel) + 0.5) / input_resolution);
6 vec4 q12 = texture(image, (vec2(floor(pixel.x), ceil(pixel.y)) + 0.5) / input_resolution);
7 vec4 q21 = texture(image, (vec2(ceil(pixel.x), floor(pixel.y)) + 0.5) / input_resolution);
8 vec4 q22 = texture(image, (ceil(pixel) + 0.5) / input_resolution);
9
10 vec4 r1 = mix(q11, q21, fract(pixel.x));
11 vec4 r2 = mix(q12, q22, fract(pixel.x));
12
13 return mix (r1, r2, fract(pixel.y));
14 }
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