109 lines
2.7 KiB
GLSL
109 lines
2.7 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform float time;
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uniform vec2 resolution;
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#define iTime time * 0.05 + 50.0
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#define iResolution resolution
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#define fragCoord gl_FragCoord
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#define fragColor gl_FragColor
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float colormap_red(float x) {
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if (x < 0.0) {
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return 54.0 / 255.0;
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} else if (x < 20049.0 / 82979.0) {
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return (829.79 * x + 54.51) / 255.0;
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} else {
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return 1.0;
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}
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}
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float colormap_green(float x) {
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if (x < 20049.0 / 82979.0) {
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return 0.0;
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} else if (x < 327013.0 / 810990.0) {
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return (8546482679670.0 / 10875673217.0 * x - 2064961390770.0 / 10875673217.0) / 255.0;
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} else if (x <= 1.0) {
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return (103806720.0 / 483977.0 * x + 19607415.0 / 483977.0) / 255.0;
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} else {
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return 1.0;
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}
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}
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float colormap_blue(float x) {
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if (x < 0.0) {
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return 54.0 / 255.0;
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} else if (x < 7249.0 / 82979.0) {
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return (829.79 * x + 54.51) / 255.0;
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} else if (x < 20049.0 / 82979.0) {
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return 127.0 / 255.0;
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} else if (x < 327013.0 / 810990.0) {
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return (792.02249341361393720147485376583 * x - 64.364790735602331034989206222672) / 255.0;
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} else {
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return 1.0;
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}
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}
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vec4 colormap(float x) {
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return vec4(colormap_red(x), colormap_green(x), colormap_blue(x), 1.0);
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}
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// https://iquilezles.org/articles/warp
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/*float noise( in vec2 x )
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{
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vec2 p = floor(x);
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vec2 f = fract(x);
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f = f*f*(3.0-2.0*f);
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float a = textureLod(iChannel0,(p+vec2(0.5,0.5))/256.0,0.0).x;
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float b = textureLod(iChannel0,(p+vec2(1.5,0.5))/256.0,0.0).x;
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float c = textureLod(iChannel0,(p+vec2(0.5,1.5))/256.0,0.0).x;
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float d = textureLod(iChannel0,(p+vec2(1.5,1.5))/256.0,0.0).x;
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return mix(mix( a, b,f.x), mix( c, d,f.x),f.y);
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}*/
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float rand(vec2 n) {
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return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
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}
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float noise(vec2 p){
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vec2 ip = floor(p);
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vec2 u = fract(p);
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u = u*u*(3.0-2.0*u);
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float res = mix(
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mix(rand(ip),rand(ip+vec2(1.0,0.0)),u.x),
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mix(rand(ip+vec2(0.0,1.0)),rand(ip+vec2(1.0,1.0)),u.x),u.y);
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return res*res;
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}
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const mat2 mtx = mat2( 0.80, 0.60, -0.60, 0.80 );
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float fbm( vec2 p )
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{
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float f = 0.0;
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f += 0.500000*noise( p + iTime ); p = mtx*p*2.02;
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f += 0.031250*noise( p ); p = mtx*p*2.01;
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f += 0.250000*noise( p ); p = mtx*p*2.03;
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f += 0.125000*noise( p ); p = mtx*p*2.01;
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f += 0.062500*noise( p ); p = mtx*p*2.04;
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f += 0.015625*noise( p + sin(iTime) );
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return f/0.96875;
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}
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float pattern( in vec2 p )
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{
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return fbm( p + fbm( p + fbm( p ) ) );
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}
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void main()
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{
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vec2 uv = fragCoord.xy/iResolution.x;
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float shade = pattern(uv);
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fragColor = vec4(colormap(shade).rgb, shade);
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}
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