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https://mzte.de/git/LordMZTE/dotfiles.git
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70 lines
1.3 KiB
GLSL
70 lines
1.3 KiB
GLSL
#version 300 es
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precision highp float;
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uniform float time;
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uniform vec2 offset;
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in vec2 fragCoord;
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// shader: https://www.shadertoy.com/view/tsXBzS
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vec3 palette(float d){
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return mix(vec3(0.2,0.0,0.0),vec3(.5,0.,0.),d);
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}
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vec2 rotate(vec2 p,float a){
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float c = cos(a);
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float s = sin(a);
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return p*mat2(c,s,-s,c);
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}
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float map(vec3 p){
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for( int i = 0; i<8; ++i){
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float t = time*0.2;
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p.xz =rotate(p.xz,t);
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p.xy =rotate(p.xy,t*1.89);
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p.xz = abs(p.xz);
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p.xz-=.5;
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}
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return dot(sign(p),p)/5.;
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}
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vec4 rm (vec3 ro, vec3 rd){
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float t = 0.;
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vec3 col = vec3(0.);
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float d;
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for(float i =0.; i<64.; i++){
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vec3 p = ro + rd*t;
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d = map(p)*.5;
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if(d<0.02){
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break;
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}
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if(d>100.){
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break;
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}
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//col+=vec3(0.6,0.8,0.8)/(400.*(d));
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col+=palette(length(p)*.1)/(400.*(d));
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t+=d;
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}
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return vec4(col,1./(d*100.));
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}
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void main()
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{
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vec2 uv = fragCoord / 5.0;
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vec3 ro = vec3(0.,0.,-50.);
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ro.xz = rotate(ro.xz,time);
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vec3 cf = normalize(-ro);
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vec3 cs = normalize(cross(cf,vec3(0.,1.,0.)));
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vec3 cu = normalize(cross(cf,cs));
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vec3 uuv = ro+cf*3. + uv.x*cs + uv.y*cu;
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vec3 rd = normalize(uuv-ro);
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vec4 col = rm(ro,rd);
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gl_FragColor = col;
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}
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