mirror of https://github.com/bsnes-emu/bsnes.git
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
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#define SCANLINE_DEPTH 0.25
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#define BLOOM 0.4
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STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
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{
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vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
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vec4 q11 = texture(image, (floor(pixel) + 0.5) / input_resolution);
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vec4 q12 = texture(image, (vec2(floor(pixel.x), ceil(pixel.y)) + 0.5) / input_resolution);
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vec4 q21 = texture(image, (vec2(ceil(pixel.x), floor(pixel.y)) + 0.5) / input_resolution);
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vec4 q22 = texture(image, (ceil(pixel) + 0.5) / input_resolution);
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vec2 s = smoothstep(0., 1., fract(pixel));
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vec4 r1 = mix(q11, q21, s.x);
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vec4 r2 = mix(q12, q22, s.x);
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vec2 pos = fract(position * input_resolution);
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vec2 sub_pos = fract(position * input_resolution * 6);
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float multiplier = 1.0;
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if (pos.y < 1.0 / 6.0) {
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multiplier *= sub_pos.y * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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else if (pos.y > 5.0 / 6.0) {
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multiplier *= (1.0 - sub_pos.y) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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if (pos.x < 1.0 / 6.0) {
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multiplier *= sub_pos.x * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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else if (pos.x > 5.0 / 6.0) {
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multiplier *= (1.0 - sub_pos.x) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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return mix(texture(image, position) * multiplier, mix(r1, r2, s.y), BLOOM);
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}
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