From 6555a8f02cbaf26e672bea01691827f10212e32a Mon Sep 17 00:00:00 2001
From: Simon Schneegans <code@simonschneegans.de>
Date: Sun, 8 May 2022 13:56:21 +0200
Subject: [PATCH] :wrench: Fix straight alpha

---
 src/TVEffect.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/TVEffect.js b/src/TVEffect.js
index df2407b..c544d37 100644
--- a/src/TVEffect.js
+++ b/src/TVEffect.js
@@ -206,10 +206,9 @@ if (utils.isInShellProcess()) {
         // Assemble the final alpha value.
         float mask = tbMask * lrMask * ffMask;
 
-        vec4 windowColor = texture2D(uTexture, cogl_tex_coord_in[0].st);
-        windowColor.rgb = mix(windowColor.rgb, uColor * windowColor.a, smoothstep(0, 1, progress));
-
-        cogl_color_out = windowColor * mask;
+        cogl_color_out = texture2D(uTexture, cogl_tex_coord_in[0].st);
+        cogl_color_out.rgb = mix(cogl_color_out.rgb, uColor * cogl_color_out.a, smoothstep(0, 1, progress));
+        cogl_color_out.a *= mask;
 
         // These are pretty useful for understanding how this works.
         // cogl_color_out = vec4(vec3(tbMask), 1);