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- //CBS
- //Parallax scrolling fractal galaxy.
- //Inspired by JoshP's Simplicity shader: https://www.shadertoy.com/view/lslGWr
- // http://www.fractalforums.com/new-theories-and-research/very-simple-formula-for-fractal-patterns/
- float field(in vec3 p,float s) {
- float strength = 7. + .03 * log(1.e-6 + fract(sin(iTime) * 4373.11));
- float accum = s/4.;
- float prev = 0.;
- float tw = 0.;
- for (int i = 0; i < 26; ++i) {
- float mag = dot(p, p);
- p = abs(p) / mag + vec3(-.5, -.4, -1.5);
- float w = exp(-float(i) / 7.);
- accum += w * exp(-strength * pow(abs(mag - prev), 2.2));
- tw += w;
- prev = mag;
- }
- return max(0., 5. * accum / tw - .7);
- }
- // Less iterations for second layer
- float field2(in vec3 p, float s) {
- float strength = 15. + .03 * log(1.e-6 + fract(sin(iTime) * 4373.11));
- float accum = s/4.;
- float prev = 0.;
- float tw = 0.;
- for (int i = 0; i < 18; ++i) {
- float mag = dot(p, p);
- p = abs(p) / mag + vec3(-.5, -.4, -1.5);
- float w = exp(-float(i) / 7.);
- accum += w * exp(-strength * pow(abs(mag - prev), 2.2));
- tw += w;
- prev = mag;
- }
- return max(0., 5. * accum / tw - .7);
- }
- vec3 nrand3( vec2 co )
- {
- vec3 a = fract( cos( co.x*8.3e-3 + co.y )*vec3(1.3e5, 4.7e5, 2.9e5) );
- vec3 b = fract( sin( co.x*0.3e-3 + co.y )*vec3(8.1e5, 1.0e5, 0.1e5) );
- vec3 c = mix(a, b, 0.5);
- return c;
- }
- void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
- vec2 uv = 2. * fragCoord.xy / iResolution.xy - 1.;
- vec2 uvs = uv * iResolution.xy / max(iResolution.x, iResolution.y);
- vec3 p = vec3(uvs / 4., 0) + vec3(1., -1.3, 0.);
- p += .2 * vec3(sin(iTime / 16.), sin(iTime / 12.), sin(iTime / 128.));
- float freqs[4];
- //Sound
- freqs[0] = texture( iChannel0, vec2( 0.10, 0.05 ) ).x;
- freqs[1] = texture( iChannel0, vec2( 0.27, 0.05 ) ).x;
- freqs[2] = texture( iChannel0, vec2( 0.35, 0.55 ) ).x;
- freqs[3] = texture( iChannel0, vec2( 0.30, 0.50 ) ).x;
- float t = field(p,freqs[2]);
- float v = (1. - exp((abs(uv.x) - 1.) * 6.)) * (1. - exp((abs(uv.y) - 1.) * 6.));
- //Second Layer
- vec3 p2 = vec3(uvs / (4.+sin(iTime*0.0001)*0.2+0.2+sin(iTime*0.15)*0.3+0.4), 1.5) + vec3(2., -1.3, -1.);
- p2 += 0.25 * vec3(sin(iTime / 16.), sin(iTime / 16.), sin(iTime / 128.));
- float t2 = field2(p2,freqs[3]);
- vec4 c2 = mix(.4, 1., v) * vec4(1.3 * t2 * t2 * t2 ,1.8 * t2 * t2 , t2* freqs[0], t2);
- //Let's add some stars
- //Thanks to http://glsl.heroku.com/e#6904.0
- vec2 seed = p.xy * 2.0;
- seed = floor(seed * iResolution.x);
- vec3 rnd = nrand3( seed );
- vec4 starcolor = vec4(pow(rnd.y,30.0));
- //Second Layer
- vec2 seed2 = p2.xy * 2.0;
- seed2 = floor(seed2 * iResolution.x);
- vec3 rnd2 = nrand3( seed2 );
- starcolor += vec4(pow(rnd2.y,40.0));
- fragColor = mix(freqs[3]-.3, 1., v) * vec4(1.5*freqs[2] * t * t* t , 1.2*freqs[1] * t * t, freqs[3]*t, 1.0)+c2+starcolor;
- }
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