mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
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23 lines
608 B
GLSL
23 lines
608 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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vec3 rgb2hsv(vec3 c) {
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vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
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vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
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float d = q.x - min(q.w, q.y);
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float e = 0.0000000001;
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return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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void main() {
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vec4 col = texture2D( gm_BaseTexture, v_vTexcoord);
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vec3 hsv = rgb2hsv(col.rgb);
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gl_FragColor = vec4(hsv.r, hsv.r, hsv.r, col.a);
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}
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