35 lines
834 B
GLSL
35 lines
834 B
GLSL
#version 120
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varying vec2 uv;
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uniform float TimeSeconds;
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// https://github.com/hughsk/glsl-hsv2rgb/blob/master/index.glsl
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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 remapX(float x) {
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return clamp(10.0/9.5 - 0.1 * abs(x - 11.5), 0.0, 1.0);
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}
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vec3 _sample(vec2 xy) {
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float hue = mod(cos(TimeSeconds * 0.25) * 0.5 + xy.x + 0.1 * cos(TimeSeconds * 0.25 * 20.0 + xy.y * 20.0), 1.0);
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return hsv2rgb(vec3(hue, 1.0, 1.0));
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}
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void main() {
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float y = max(uv.y, 1.0/16.0);
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float x = remapX(uv.x * 22.0);
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if (uv.x > 0.5 && uv.y < 1/17.0) {
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x = remapX((uv.x - 0.45) * 22.0);
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y = 1.0;
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}
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gl_FragColor = vec4(_sample(vec2(x, y)), 1.0);
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}
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