128 lines
3.7 KiB
GLSL
128 lines
3.7 KiB
GLSL
//http://glsl.heroku.com/e#5454.21
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uniform float time;
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uniform vec2 mouse;
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uniform vec2 resolution;
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// from http://glsl.heroku.com/e#5484.0
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vec3 asteroids( vec2 position ) {
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// 256 angle steps
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float angle = atan(position.y,position.x)/(2.*3.14159265359);
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angle -= floor(angle);
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float rad = length(position);
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float color = 0.0;
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for (int i = 0; i < 5; i++) {
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float angleFract = fract(angle*256.);
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float angleRnd = floor(angle*256.)+1.;
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float angleRnd1 = fract(angleRnd*fract(angleRnd*.7235)*45.1);
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float angleRnd2 = fract(angleRnd*fract(angleRnd*.82657)*13.724);
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float t = -time+angleRnd1*10.;
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float radDist = sqrt(angleRnd2+float(i));
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float adist = radDist/rad*.1;
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float dist = (t*.1+adist);
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dist = abs(fract(dist)-.5);
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color += max(0.,.5-dist*40./adist)*(.5-abs(angleFract-.5))*5./adist/radDist;
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angle = fract(angle+.61);
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}
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return vec3( color )*.3;
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}
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// from http://glsl.heroku.com/e#5248.0
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#define BIAS 0.1
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#define SHARPNESS 3.0
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vec3 star(vec2 position, float BLADES) {
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float blade = clamp(pow(sin(atan(position.y,position.x )*BLADES)+BIAS, SHARPNESS), 0.0, 1.0);
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vec3 color = mix(vec3(-0.34, -0.5, -1.0), vec3(0.0, -0.5, -1.0), (position.y + 1.0) * 0.25);
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float d = 1.0/length(position) * 0.075;
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color += vec3(0.95, 0.65, 0.30) * d;
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color += vec3(0.95, 0.45, 0.30) * min(1.0, blade *0.7) * d;
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return color;
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}
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vec3 star2(vec2 position, float BLADES) {
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float blade = clamp(pow(sin(atan(position.y,position.x )*BLADES + time*.5)+BIAS, 8.0), 0.0, 1.0);
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vec3 color = mix(vec3(-0.34, -0.5, -0.0), vec3(0.0, -0.5, -0.0), (position.y + 1.0) * 0.25);
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float d = 1.0/length(position) * 0.075;
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color += vec3(0.95, 0.65, 0.30) * d;
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color += vec3(0.95, 0.45, 0.30) * min(1.0, blade *0.7)*0.5;
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return max(color.rgb, 0.0)*.5;
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}
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// Tweaked from http://glsl.heroku.com/e#4982.0
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float hash( float n ) { return fract(sin(n)*43758.5453); }
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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 n = p.x + p.y*57.0;
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float res = mix(mix(hash(n+0.0), hash(n+1.0),f.x), mix(hash(n+57.0), hash(n+58.0),f.x),f.y);
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return res;
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}
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vec3 cloud(vec2 p) {
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vec3 f = vec3(0.0);
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f += 0.5000*noise(p*10.0)*vec3(.45, .55, 1.0);
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f += 0.2500*noise(p*20.0)*vec3(.85, .45, 1.0);
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f += 0.1250*noise(p*40.0)*vec3(1.0, .00, 0.3);
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f += 0.0625*noise(p*80.0)*vec3(1.0, 1.0, 1.0);
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return f*.5;
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}
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const float SPEED = 0.005;
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const float SCALE = 80.0;
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const float DENSITY = 1.5;
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const float BRIGHTNESS = 10.0;
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vec2 ORIGIN = resolution.xy*.5;
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float rand(vec2 co){ return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453); }
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vec3 layer(float i, vec2 pos, float dist, vec2 coord) {
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float a = pow((1.0-dist),20.0);
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float t = i*10.0 - time*i*i;
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float r = coord.x - (t*SPEED);
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float c = fract(a+coord.y + i*.543);
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vec2 p = vec2(r, c*.5)*SCALE*(4.0/(i*i));
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vec2 uv = fract(p)*2.0-1.0;
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float m = clamp((rand(floor(p))-DENSITY/i)*BRIGHTNESS, 0.0, 1.0);
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return clamp(star(uv*.5, 6.0)*m*dist, 0.0, 1.0);
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}
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void main( void ) {
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vec2 pos = gl_FragCoord.xy - ORIGIN ;
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float dist = length(pos) / resolution.y;
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vec2 coord = vec2(pow(dist, 0.1), atan(pos.x, pos.y) / (3.1415926*2.0));
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// Nebulous cloud
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vec3 color = cloud(pos/resolution);
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// Background stars
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float a = pow((1.0-dist),20.0);
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float t = time*-.05;
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float r = coord.x - (t*0.005);
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float c = fract(a+coord.y + 0.0*.543);
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vec2 p = vec2(r, c*.5)*4000.0;
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vec2 uv = fract(p)*2.0-1.0;
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float m = clamp((rand(floor(p))-.9)*10.0, 0.0, 1.0);
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color += clamp((1.0-length(uv*2.0))*m*dist, 0.0, 1.0);
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color += asteroids(pos/resolution.x);
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// Flying stars into black hole
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color += layer(2.0, pos, dist, coord);
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color += layer(3.0, pos, dist, coord);
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color += layer(4.0, pos, dist, coord);
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color += star2(pos/resolution, 2.0);
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gl_FragColor = vec4(color, 1.0);
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} |