80 lines
1.9 KiB
GLSL
80 lines
1.9 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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// Tweaked from http://glsl.heroku.com/e#5941.2
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//
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// Description : Array and textureless GLSL 2D/3D/4D
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// noise functions with wrapping
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// Author : People
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// Maintainer : Anyone
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// Lastmod : 20130111 (davidwparker)
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// License : No Copyright No rights reserved.
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// Freely distributed
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//
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uniform mat3 outputToWorld;
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uniform vec4 color1;
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uniform vec4 color2;
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uniform float detail;
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uniform float time;
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const float pi_twice = 6.283185307;
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float snoise(vec3 uv, float res)
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{
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const vec3 s = vec3(1e0, 1e2, 1e4);
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uv *= res;
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vec3 uv0 = floor(mod(uv, res))*s;
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vec3 uv1 = floor(mod(uv+vec3(1.), res))*s;
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vec3 f = fract(uv);
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f = f*f*(3.0-2.0*f);
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vec4 v = vec4(uv0.x+uv0.y+uv0.z, uv1.x+uv0.y+uv0.z,
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uv0.x+uv1.y+uv0.z, uv1.x+uv1.y+uv0.z);
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vec4 r = fract(sin(v*1e-3)*1e5);
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float r0 = mix(mix(r.x, r.y, f.x), mix(r.z, r.w, f.x), f.y);
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r = fract(sin((v + uv1.z - uv0.z)*1e-3)*1e5);
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float r1 = mix(mix(r.x, r.y, f.x), mix(r.z, r.w, f.x), f.y);
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return 2.0 * mix(r0, r1, f.z) - 1.0; // Range in [-1, 1]
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}
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void main(void)
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{
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vec2 p = .002 * (outputToWorld * vec3(gl_FragCoord.xy, 1.0)).xy;
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float color = 3.0 * (1.0 - 2.0 * length(p));
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vec3 coord = vec3(atan(p.y, p.x) / pi_twice, length(p) * 0.4, 0.0);
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for(int i = 1; i <= 7; i++)
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{
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float power = pow(2.0, float(i));
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vec3 timed = vec3(0.0, - time*.02, time*.01);
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color += 1.5 * snoise(coord + timed, power * detail) / power;
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}
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color = max(color, 0.);
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// ORIGINAL:
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//gl_FragColor = vec4( color, pow(max(color,0.),2.)*0.4, pow(max(color,0.),3.)*0.15 , 1.0);
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vec4 col1 = color1 * color1.a, col2 = color2 * color2.a;
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gl_FragColor = mix(col1, col2, color / 3.0);
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gl_FragColor.a *= smoothstep(0.0, 1.0, color);
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gl_FragColor.rgb *= gl_FragColor.a; // Premultiplication
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}
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