From 8b79fb75b97251442452e7c3810c014f21a23fe3 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Tue, 9 Apr 2019 13:24:52 +0200
Subject: [PATCH] glgsg: allow multisampling on FBO even if host has no
 multisamples

Fixes #601
---
 panda/src/glstuff/glGraphicsBuffer_src.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/panda/src/glstuff/glGraphicsBuffer_src.cxx b/panda/src/glstuff/glGraphicsBuffer_src.cxx
index bdeb26345f..b85a3e76c1 100644
--- a/panda/src/glstuff/glGraphicsBuffer_src.cxx
+++ b/panda/src/glstuff/glGraphicsBuffer_src.cxx
@@ -659,6 +659,10 @@ rebuild_bitplanes() {
       glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
     }
+
+    // Mark the GSG as supporting multisampling, so that it will respect an
+    // AntialiasAttrib with mode M_multisample.
+    glgsg->_supports_multisample = true;
   } else {
     glDisable(GL_MULTISAMPLE);
   }