72 lines
1.5 KiB
Plaintext
72 lines
1.5 KiB
Plaintext
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float tentKernel(in vec2 xy, in float r)
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{
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return (1.0 - abs(xy.x/r)) * (1.0 - abs(xy.y/r)) / (r*r);
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}
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float gaussianWeight(in float delta, in float sigma)
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{
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return exp(-delta*delta/(2.0 * sigma * sigma)) * 2.5 * sigma;
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}
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float luminance(in vec3 col)
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{
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return dot(col, vec3(0.2126, 0.7152, 0.0722));
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}
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vec3 fasterBilateralFilter(in vec2 uv, in sampler2D tex, in int r, in int steping, in float omegaColor)
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{
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vec2 scale = 1.0 / vec2(textureSize(tex, 0));
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vec3 sum = vec3(0);
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vec3 original = texture(tex, uv).rgb;
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float wp = 0.0;
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for (int x = -r; x <= r; x+=steping)
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for (int y = -r; y <= r; y+=steping)
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{
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vec2 off = vec2(x, y) * scale;
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vec3 col = texture(tex, uv + off).rgb;
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float di = luminance(original) - luminance(col);
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float space = tentKernel(vec2(x, y), float(r));
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float range = gaussianWeight(di, omegaColor);
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float w = space * range;
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wp += w;
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sum += col * w;
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}
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return sum / wp;
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 uv = fragCoord/iResolution.xy;
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vec3 col;
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if (uv.x < 0.33333)
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{
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col = texture(iChannel0, uv).rgb;
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}
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else if (uv.x > 0.33333 && uv.x < 0.66666)
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{
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col = fasterBilateralFilter(uv, iChannel0, 12, 3, 0.1);
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}
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else
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{
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col = texture(iChannel1, uv).rgb;
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}
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const float PI = 3.141592653589793;
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float border = step(0.02, abs(sin(uv.x*PI*3.0)));
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col *= border;
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fragColor = vec4(col,1.0);
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}
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