From f741c9476f2d32a846562819e3a9b3a4961f965c Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Sun, 10 Feb 2019 16:19:24 +0100
Subject: [PATCH] display: fix lighting being disabled when only AmbientLight
 is on

---
 panda/src/display/graphicsStateGuardian.cxx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/panda/src/display/graphicsStateGuardian.cxx b/panda/src/display/graphicsStateGuardian.cxx
index 93a3f36651..233d47bc09 100644
--- a/panda/src/display/graphicsStateGuardian.cxx
+++ b/panda/src/display/graphicsStateGuardian.cxx
@@ -2823,6 +2823,12 @@ do_issue_light() {
     }
 
   } else {
+    // Don't forget to still enable lighting if we have only an ambient light.
+    if (!_lighting_enabled) {
+      enable_lighting(true);
+      _lighting_enabled = true;
+    }
+
     set_ambient_light(target_light->get_ambient_contribution());
   }