KAR98S

RainbowDisco.frag

May 31st, 2020 (edited)
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  1. #ifdef GL_ES
  2. precision mediump float;
  3. #endif
  4. //#define ABC
  5. #define PI 3.14159
  6.  
  7. const float PI_by_three = 1.04720;
  8. const float two_PI_by_three = 2.09440;
  9.  
  10. uniform vec2 u_resolution;
  11. uniform vec2 u_mouse;
  12. uniform float u_time;
  13.  
  14. vec2 res = u_resolution;
  15.  
  16. float diatance(vec2 p1, vec2 p2){
  17.     return (
  18.         sqrt(
  19.             pow((p2.y - p1.y),2.0) + pow((p2.x - p1.x),2.0)
  20.     ));
  21. }
  22.  
  23. void main() {
  24.     float time = u_time * 5.0 + (u_mouse.x/25.);
  25.     float R,G,B,A, size, tmp, distanceFromCenter = res.x/3.0;
  26.     vec2 center = vec2(res.x/2.0,res.y/2.0),//center
  27.             p1,p2,p3;
  28.     vec3 color;
  29.    
  30.     p1 = p2 = p3 = center;
  31.     p1.y += distanceFromCenter;
  32.     p2.x -= distanceFromCenter * sin(PI_by_three);
  33.     p2.y -= distanceFromCenter * cos(PI_by_three);
  34.     p3.x += distanceFromCenter * sin(PI_by_three);
  35.     p3.y -= distanceFromCenter * cos(PI_by_three);
  36.    
  37.     size = distance(p1,p2)*((u_mouse.x/res.x) + 0.5);
  38.     //size1 *= 0.2 + abs(sin(u_time));
  39.     p1.x = center.x + (size * cos(time)) / 2.0;
  40.     p1.y = center.y + (size * sin(time)) / 2.0;
  41.    
  42.     p2.x = center.x + (size * cos(time + two_PI_by_three)) / 2.0;
  43.     p2.y = center.y + (size * sin(time + two_PI_by_three)) / 2.0;
  44.    
  45.     p3.x = center.x + (size * cos(time + 2.0*two_PI_by_three)) / 2.0;
  46.     p3.y = center.y + (size * sin(time + 2.0*two_PI_by_three)) / 2.0;
  47.     float dist;
  48.    
  49.     dist = distance(p1,gl_FragCoord.xy);
  50.     if(dist <= size*2.0){
  51.         tmp = (dist)/(size*2.0);
  52.         B = 1.0-tmp;
  53.     }
  54.     else
  55.         B = 0.0;
  56.    
  57.     dist = distance(p2,gl_FragCoord.xy);
  58.     if(dist <= size*2.0){
  59.         tmp = (dist)/(size*2.0);
  60.         R = 1.0-tmp;
  61.     }
  62.     else
  63.         R = 0.0;
  64.    
  65.     dist = distance(p3,gl_FragCoord.xy);
  66.     if(dist <= size*2.){
  67.         tmp = (dist)/(size*2.0);
  68.         G = 1.0-tmp;
  69.     }
  70.     else
  71.         G = 0.0;
  72.    
  73.     dist = distance(center,gl_FragCoord.xy);
  74.     if(dist <= size*3.0){
  75.         tmp = (dist)/(size*3.0);
  76.         R += (1.0 - tmp)*0.3;
  77.         G += (1.0 - tmp)*0.3;
  78.         B += (1.0 - tmp)*0.3;
  79.     }
  80.    
  81.    
  82.     color = vec3(R,G,B);
  83.     A = 1.0;
  84.     gl_FragColor = vec4(color,A);
  85. }
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