shaders/blitblur.fs

   1 out vec4 FragColor;
   2 uniform sampler2D uTexMain;
   3 uniform sampler2D uTexMotion;
   4 uniform float uBlurStrength;
   5
   6 in vec2 aUv;
   7
   8 vec2 rand_hash22( vec2 p )
   9 {
  10    vec3 p3 = fract(vec3(p.xyx) * 213.8976123);
  11    p3 += dot(p3, p3.yzx+19.19);
  12    return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));
  13 }
  14
  15 void main()
  16 {
  17    vec2 vcenter = (aUv-vec2(0.5))*vec2(2.0);
  18    vec2 vrand = rand_hash22( aUv ) * 2.0 - vec2(1.0);
  19    vec2 vrand1 = rand_hash22( vrand ) * 2.0 - vec2(1.0);
  20
  21    vec2 vdir = texture( uTexMotion, aUv ).xy * uBlurStrength;
  22
  23    vec4 vcolour0 = texture( uTexMain, aUv + vdir*vrand.x );
  24    vec4 vcolour1 = texture( uTexMain, aUv + vdir*vrand.y );
  25    vec4 vcolour2 = texture( uTexMain, aUv + vdir*vrand1.x );
  26    vec4 vcolour3 = texture( uTexMain, aUv + vdir*vrand1.y );
  27
  28    FragColor = ( vcolour0 + vcolour1 + vcolour2 + vcolour3 ) * 0.25;
  29 }