ThomasWilshaw
314167be40
* Add a noise generator node * Cleanup * Correctly name CMakeLists.txt * Typo
39 lines
1.2 KiB
GLSL
39 lines
1.2 KiB
GLSL
uniform float time_in;
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varying vec2 ove_texcoord;
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uniform float strength_in;
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uniform bool color_in;
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//uniform bool blend;
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// precision lowp float;
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float PHI = 1.61803398874989484820459 * 00000.1; // Golden Ratio
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float PI = 3.14159265358979323846264 * 00000.1; // PI
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float SQ2 = 1.41421356237309504880169 * 10000.0; // Square Root of Two
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bool isNan( float val )
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{
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return ( val < 0.0 || 0.0 < val || val == 0.0 ) ? false : true;
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// important: some nVidias failed to cope with version below.
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// Probably wrong optimization.
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/*return ( val <= 0.0 || 0.0 <= val ) ? false : true;*/
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// Taken from: https://stackoverflow.com/questions/11810158/how-to-deal-with-nan-or-inf-in-opengl-es-2-0-shaders
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}
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float gold_noise(vec2 coordinate, float seed){
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float value = fract(tan(distance(coordinate*(seed+PHI), vec2(PHI, PI)))*SQ2)*(strength_in*0.01);
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return isNan(value) ? 0.0 : value;
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}
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void main(void) {
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vec3 noise;
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if (color_in) {
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noise = vec3(gold_noise(ove_texcoord, time_in + 42069.0), gold_noise(ove_texcoord, time_in + 69220.0), gold_noise(ove_texcoord, time_in + 1337.0));
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} else {
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noise = vec3(gold_noise(ove_texcoord, time_in + 69420.0));
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}
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gl_FragColor = vec4(noise, 1.0);
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}
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