Factorize the code to compute sampling points for bilinear sampling into a shared...
[movit] / blur_effect.frag
index 8c0a01d..c6e4cf5 100644 (file)
@@ -1,24 +1,14 @@
 // A simple unidirectional blur.
 
-uniform vec2 PREFIX(pixel_offset);
-uniform float PREFIX(weight)[15];
+#define NUM_TAPS 16
+
+uniform vec4 PREFIX(samples)[NUM_TAPS + 1];
 
 vec4 FUNCNAME(vec2 tc) {
-       vec4 x = LAST_INPUT(tc);
-       return
-               vec4(PREFIX(weight)[ 0]) * LAST_INPUT(tc - 7.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 1]) * LAST_INPUT(tc - 6.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 2]) * LAST_INPUT(tc - 5.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 3]) * LAST_INPUT(tc - 4.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 4]) * LAST_INPUT(tc - 3.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 5]) * LAST_INPUT(tc - 2.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 6]) * LAST_INPUT(tc -       PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 7]) * LAST_INPUT(tc) +
-               vec4(PREFIX(weight)[ 8]) * LAST_INPUT(tc +       PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[ 9]) * LAST_INPUT(tc + 2.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[10]) * LAST_INPUT(tc + 3.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[11]) * LAST_INPUT(tc + 4.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[12]) * LAST_INPUT(tc + 5.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[13]) * LAST_INPUT(tc + 6.0 * PREFIX(pixel_offset)) +
-               vec4(PREFIX(weight)[14]) * LAST_INPUT(tc + 7.0 * PREFIX(pixel_offset));
+       vec4 sum = vec4(PREFIX(samples)[0].z) * INPUT(tc);
+       for (int i = 1; i < NUM_TAPS + 1; ++i) {
+               vec4 sample = PREFIX(samples)[i];
+               sum += vec4(sample.z) * (INPUT(tc - sample.xy) + INPUT(tc + sample.xy));
+       }
+       return sum;
 }