60 lines
1.4 KiB
GLSL
60 lines
1.4 KiB
GLSL
/***
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Despill - for cleaning up keying residue.
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Implementation by unfa for Olive-Editor Community
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***/
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uniform sampler2D tex;
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varying vec2 uTexCoord;
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uniform vec2 resolution;
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uniform int channel;
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const vec2 renderScale = vec2(1,1);
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void main(void)
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{
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vec2 uv = gl_FragCoord.xy/resolution.xy;
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vec4 col = texture2D(tex, uv);
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// separate channels
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float r = col.r;
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float g = col.g;
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float b = col.b;
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float a = col.a;
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// Select despilled channel: 0 = RED; 1 = GREEN; 2 = BLUE;
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if (channel == 0) // RED
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{
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// replace new green channel by avaraging between existing red and blue channels
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float r2 = (g + b) * 0.5;
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// now composite the original and new gree channel using the "darken" mode
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r = min(r, r2);
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}
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if (channel == 1) // GREEN
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{
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// replace new green channel by avaraging between existing red and blue channels
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float g2 = (r + b) * 0.5;
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// now composite the original and new gree channel using the "darken" mode
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g = min(g, g2);
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}
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if (channel == 2) // BLUE
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{
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// replace new green channel by avaraging between existing red and blue channels
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float b2 = (r + g) * 0.5;
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// now composite the original and new gree channel using the "darken" mode
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b = min(b, b2);
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}
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// and return the result
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gl_FragColor = vec4(r, g, b, a);
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}
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