mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
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30 lines
854 B
GLSL
30 lines
854 B
GLSL
varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform sampler2D samH;
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uniform sampler2D samS;
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uniform sampler2D samV;
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uniform sampler2D samA;
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uniform int useH;
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uniform int useS;
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uniform int useV;
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uniform int useA;
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vec3 hsv2rgb(vec3 c) {
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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float sample(vec4 col, int ch) { return (col[0] + col[1] + col[2]) / 3. * col[3]; }
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void main() {
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float h = (useH == 1)? sample(texture2D( samH, v_vTexcoord ), 0) : 0.;
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float s = (useS == 1)? sample(texture2D( samS, v_vTexcoord ), 1) : 0.;
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float v = (useV == 1)? sample(texture2D( samV, v_vTexcoord ), 2) : 0.;
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float a = (useA == 1)? sample(texture2D( samA, v_vTexcoord ), 3) : 1.;
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gl_FragColor = vec4(hsv2rgb(vec3(h, s, v)), a);
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}
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