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 uniform vec2 PREFIX(samples)[NUM_TAPS / 2 + 1];
   6
   7 vec4 FUNCNAME(vec2 tc) {
   8         vec4 sum = vec4(PREFIX(samples)[0].y) * INPUT(tc);
   9         for (int i = 1; i < NUM_TAPS / 2 + 1; ++i) {
  10                 vec2 sample = PREFIX(samples)[i];
  11                 vec2 sample1_tc = tc, sample2_tc = tc;
  12 #if DIRECTION_VERTICAL
  13                 sample1_tc.y -= sample.x;
  14                 sample2_tc.y += sample.x;
  15 #else
  16                 sample1_tc.x -= sample.x;
  17                 sample2_tc.x += sample.x;
  18 #endif
  19                 sum += vec4(sample.y) * (INPUT(sample1_tc) + INPUT(sample2_tc));
  20         }
  21         return sum;
  22 }
  23
  24 #undef DIRECTION_VERTICAL