diff --git a/resources/shaders/glide.frag b/resources/shaders/glide.frag
index 7978b55..306d7ca 100644
--- a/resources/shaders/glide.frag
+++ b/resources/shaders/glide.frag
@@ -41,7 +41,7 @@ void main() {
   vec4 oColor = getInputColor(coords);
 
   // Dissolve window.
-  oColor.a = oColor.a * (1.0 - progress);
+  oColor.a = oColor.a * (uForOpening ? uProgress : pow(1.0 - uProgress, 2.0));
 
   setOutputColor(oColor);
 }
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