Store all twiddle factors as fp16.

[movit] / overlay_matte_effect.frag

diff --git a/overlay_matte_effect.frag b/overlay_matte_effect.frag
index f80f0b1caf297a90c3df2ea7963fd5d66469af7d..12e9fee57b39b171d2d468d04b99e107857ae2cb 100644 (file)
--- a/overlay_matte_effect.frag
+++ b/overlay_matte_effect.frag
@@ -1,5 +1,6 @@
 vec4 FUNCNAME(vec2 tc) {
        vec4 orig = INPUT1(tc);
        vec4 blurred = INPUT2(tc);
-       return mix(orig, blurred, orig * vec4(PREFIX(blurred_mix_amount)));
+       float luminance = clamp(dot(orig.rgb, vec3(0.2126, 0.7152, 0.0722)), 0.0, 1.0);
+       return mix(orig, blurred, luminance * vec4(PREFIX(blurred_mix_amount)));
 }