shaders/blit_transition.fs

   1 out vec4 FragColor;
   2 in vec2 aUv;
   3 uniform float uT;
   4
   5 void main(){
   6    float d = uT + distance( aUv, vec2(0.5,0.5) );
   7
   8    vec3 vDither = vec3( dot( vec2( 171.0, 231.0 ), gl_FragCoord.xy) );
   9    float dither = fract( vDither.g / 71.0 ) - 0.5;
  10
  11    if( d+dither < -0.5 )
  12       discard;
  13
  14    FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );
  15 }