From 11bee6ee356e7e2f9bb8746b29af7977921ae345 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Fri, 10 Mar 2017 21:46:51 +0100
Subject: [PATCH] Avoid compiling composite maps that are no longer referenced

---
 components/terrain/compositemaprenderer.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/components/terrain/compositemaprenderer.cpp b/components/terrain/compositemaprenderer.cpp
index 49d72979f0..5300aac857 100644
--- a/components/terrain/compositemaprenderer.cpp
+++ b/components/terrain/compositemaprenderer.cpp
@@ -57,6 +57,13 @@ void CompositeMapRenderer::drawImplementation(osg::RenderInfo &renderInfo) const
 
 void CompositeMapRenderer::compile(CompositeMap &compositeMap, osg::RenderInfo &renderInfo, double* timeLeft) const
 {
+    // if there are no more external references we can assume the texture is no longer required
+    if (compositeMap.mTexture->referenceCount() <= 1)
+    {
+        compositeMap.mCompiled = compositeMap.mDrawables.size();
+        return;
+    }
+
     osg::Timer timer;
     osg::State& state = *renderInfo.getState();
     osg::GLExtensions* ext = state.get<osg::GLExtensions>();