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https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 06:56:45 +01:00
31 lines
798 B
GLSL
31 lines
798 B
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform float base;
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uniform int mode;
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uniform sampler2D samplerR;
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uniform sampler2D samplerG;
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uniform sampler2D samplerB;
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uniform sampler2D samplerA;
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uniform int useR;
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uniform int useG;
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uniform int useB;
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uniform int useA;
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float sample(vec4 col, int ch) {
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if(mode == 0) return (col[0] + col[1] + col[2]) / 3. * col[3];
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return col[ch];
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}
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void main() {
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float r = (useR == 1)? sample(texture2D( samplerR, v_vTexcoord ), 0) : base;
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float g = (useG == 1)? sample(texture2D( samplerG, v_vTexcoord ), 1) : base;
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float b = (useB == 1)? sample(texture2D( samplerB, v_vTexcoord ), 2) : base;
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float a = (useA == 1)? sample(texture2D( samplerA, v_vTexcoord ), 3) : 1.;
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gl_FragColor = vec4(r, g, b, a);
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}
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