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17 lines
634 B
GLSL
17 lines
634 B
GLSL
precision highp float;
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varying vec2 uv;
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uniform sampler2D tex;
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uniform float hue;
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const mat3 rgb2yiq = mat3(0.299, 0.587, 0.114, 0.595716, -0.274453, -0.321263, 0.211456, -0.522591, 0.311135);
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const mat3 yiq2rgb = mat3(1.0, 0.9563, 0.6210, 1.0, -0.2721, -0.6474, 1.0, -1.1070, 1.7046);
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void main() {
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vec3 yColor = rgb2yiq * texture2D(tex, uv).rgb;
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float originalHue = atan(yColor.b, yColor.g);
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float finalHue = originalHue + hue;
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float chroma = sqrt(yColor.b*yColor.b+yColor.g*yColor.g);
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vec3 yFinalColor = vec3(yColor.r, chroma * cos(finalHue), chroma * sin(finalHue));
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gl_FragColor = vec4(yiq2rgb*yFinalColor, 1.0);
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}
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