34 lines
1.0 KiB
GLSL
34 lines
1.0 KiB
GLSL
float rand(vec2 x) {
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return fract(cos(dot(x, vec2(13.9898, 8.141))) * 43758.5453);
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}
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vec2 rand2(vec2 x) {
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return fract(cos(vec2(dot(x, vec2(13.9898, 8.141)),
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dot(x, vec2(3.4562, 17.398)))) * 43758.5453);
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}
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vec3 rand3(vec2 x) {
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return fract(cos(vec3(dot(x, vec2(13.9898, 8.141)),
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dot(x, vec2(3.4562, 17.398)),
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dot(x, vec2(13.254, 5.867)))) * 43758.5453);
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}
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// From http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl
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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 = c.g < c.b ? vec4(c.bg, K.wz) : vec4(c.gb, K.xy);
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vec4 q = c.r < p.x ? vec4(p.xyw, c.r) : vec4(c.r, p.yzx);
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float d = q.x - min(q.w, q.y);
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float e = 1.0e-10;
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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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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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uniform float envelope_time = 1.0;
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