X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=blur_effect.frag;h=f8497b3fb19d45ca439af30177f3272b910b7841;hp=c6e4cf5465e7cbf62178edd8e231d8c962b8c1d2;hb=0830ff087940468a6601b12e6bea8893b722ddcb;hpb=6eb839737216564bcaf4645b7ebf6ea9efc2da09

diff --git a/blur_effect.frag b/blur_effect.frag
index c6e4cf5..f8497b3 100644
--- a/blur_effect.frag
+++ b/blur_effect.frag
@@ -1,14 +1,25 @@
-// A simple unidirectional blur.
+// A simple un.directional blur.
+// DIRECTION_VERTICAL will be #defined to 1 if we are doing a vertical blur,
+// 0 otherwise.
 
-#define NUM_TAPS 16
-
-uniform vec4 PREFIX(samples)[NUM_TAPS + 1];
+// Implicit uniforms:
+// uniform vec2 PREFIX(samples)[NUM_TAPS / 2 + 1];
 
 vec4 FUNCNAME(vec2 tc) {
-	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));
+	vec4 sum = vec4(PREFIX(samples)[0].y) * INPUT(tc);
+	for (int i = 1; i < NUM_TAPS / 2 + 1; ++i) {
+		vec2 sample = PREFIX(samples)[i];
+		vec2 sample1_tc = tc, sample2_tc = tc;
+#if DIRECTION_VERTICAL
+		sample1_tc.y -= sample.x;
+		sample2_tc.y += sample.x;
+#else
+		sample1_tc.x -= sample.x;
+		sample2_tc.x += sample.x;
+#endif
+		sum += vec4(sample.y) * (INPUT(sample1_tc) + INPUT(sample2_tc));
 	}
 	return sum;
 }
+
+#undef DIRECTION_VERTICAL