From 6b12864a7b46a403c3e8e12f97f7ece3a2273168 Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Mon, 1 Feb 2021 13:22:40 +0000
Subject: [PATCH] Ensure pixel pack/unpack buffers don't break overlays on GL

---
 util/test/demos/gl/gl_overlay_test.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/util/test/demos/gl/gl_overlay_test.cpp b/util/test/demos/gl/gl_overlay_test.cpp
index 1ca96e88e..8a04cc0d4 100644
--- a/util/test/demos/gl/gl_overlay_test.cpp
+++ b/util/test/demos/gl/gl_overlay_test.cpp
@@ -232,6 +232,12 @@ void main()
 
     glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, subtex, 3, 2);
 
+    // keep a trash buffer bound to pixel pack/unpack
+    GLuint trash = MakeBuffer();
+    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, trash);
+    glBufferStorage(GL_PIXEL_UNPACK_BUFFER, 1024, 0, 0);
+    glBindBuffer(GL_PIXEL_PACK_BUFFER, trash);
+
     while(Running())
     {
       glBindVertexArray(vao);