From 52c0e2759edffa0edcc467f58be0b8715922abdb Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Tue, 16 Mar 2021 18:45:27 +0100
Subject: [PATCH] glgsg: Fix copy-to-texture/ram for multisample FBO

Should read from resolved FBO, not from multisample FBO

Fixes #1129
---
 panda/src/glstuff/glGraphicsBuffer_src.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/panda/src/glstuff/glGraphicsBuffer_src.cxx b/panda/src/glstuff/glGraphicsBuffer_src.cxx
index 7413fef56e..ff28f4c192 100644
--- a/panda/src/glstuff/glGraphicsBuffer_src.cxx
+++ b/panda/src/glstuff/glGraphicsBuffer_src.cxx
@@ -1937,6 +1937,9 @@ resolve_multisamples() {
 #endif
   report_my_gl_errors();
 
+  // Bind the regular FBO as read buffer for the sake of copy_to_textures.
+  glgsg->_glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, fbo);
+
 #ifndef OPENGLES
   if (_have_any_color) {
     glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);