Rename .glsl to .vert/.frag.

[movit] / vignette_effect.frag

diff --git a/vignette_effect.frag b/vignette_effect.frag
new file mode 100644 (file)
index 0000000..bc84516
--- /dev/null
+++ b/vignette_effect.frag
@@ -0,0 +1,18 @@
+// A simple, circular vignette, with a cos² falloff.
+       
+uniform float PREFIX(inv_radius);
+uniform vec2 PREFIX(aspect_correction);
+
+vec4 FUNCNAME(vec2 tc) {
+       vec4 x = LAST_INPUT(tc);
+
+       const float pihalf = 0.5 * 3.14159265358979324;
+
+       vec2 normalized_pos = (tc - PREFIX(center)) * PREFIX(aspect_correction);
+       float dist = (length(normalized_pos) - PREFIX(inner_radius)) * PREFIX(inv_radius);
+       float linear_falloff = clamp(dist, 0.0, 1.0) * pihalf;
+       float falloff = cos(linear_falloff) * cos(linear_falloff);
+       x.rgb *= vec3(falloff);
+
+       return x;
+}