From da3ff98774cb912126cba353e608b4410347eb47 Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Tue, 10 Dec 2019 01:33:48 +1100
Subject: [PATCH] alphaover: return black if no textures are enabled

Not doing this appeared to corrupt the composited buffer somehow and return a
black image if there were two empty texture connections daisychained together
on two AlphaOver instances.
---
 app/shaders/alphaover.frag | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/app/shaders/alphaover.frag b/app/shaders/alphaover.frag
index a5467e0a3..785a5ebec 100644
--- a/app/shaders/alphaover.frag
+++ b/app/shaders/alphaover.frag
@@ -11,6 +11,11 @@ void main(void) {
   vec4 base_col = texture2D(base_in, ove_texcoord);
   vec4 blend_col = texture2D(blend_in, ove_texcoord);
 
+  if (!base_in_enabled && !blend_in_enabled) {
+    gl_FragColor = vec4(0.0);
+    return;
+  }
+
   if (!base_in_enabled) {
     gl_FragColor = blend_col;
     return;