git.sesse.net Git - movit/blob - blur_effect.frag

   1 // A simple un.directional blur.
   2 // DIRECTION_VERTICAL will be #defined to 1 if we are doing a vertical blur,
   3 // 0 otherwise.
   4
   5 // Implicit uniforms:
   6 // uniform vec2 PREFIX(samples)[NUM_TAPS / 2 + 1];
   7
   8 vec4 FUNCNAME(vec2 tc) {
   9         vec4 sum = vec4(PREFIX(samples)[0].y) * INPUT(tc);
  10         for (int i = 1; i < NUM_TAPS / 2 + 1; ++i) {
  11                 vec2 sample = PREFIX(samples)[i];
  12                 vec2 sample1_tc = tc, sample2_tc = tc;
  13 #if DIRECTION_VERTICAL
  14                 sample1_tc.y -= sample.x;
  15                 sample2_tc.y += sample.x;
  16 #else
  17                 sample1_tc.x -= sample.x;
  18                 sample2_tc.x += sample.x;
  19 #endif
  20                 sum += vec4(sample.y) * (INPUT(sample1_tc) + INPUT(sample2_tc));
  21         }
  22         return sum;
  23 }
  24
  25 #undef DIRECTION_VERTICAL