From b978153edbe735000227eb99ee7414086ffcc3fc Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Wed, 3 Jun 2015 02:24:09 +0200
Subject: [PATCH] Enable VBO sharing for terrain geometry

---
 components/terrain/buffercache.cpp | 6 ++++++
 components/terrain/terraingrid.cpp | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/components/terrain/buffercache.cpp b/components/terrain/buffercache.cpp
index 7dc93f1d65..dfb3eff883 100644
--- a/components/terrain/buffercache.cpp
+++ b/components/terrain/buffercache.cpp
@@ -218,6 +218,9 @@ namespace Terrain
             }
         }
 
+        // Assign a VBO here to enable state sharing between different Geometries.
+        uvs->setVertexBufferObject(new osg::VertexBufferObject);
+
         mUvBufferMap[mNumVerts] = uvs;
         return uvs;
     }
@@ -238,6 +241,9 @@ namespace Terrain
         else
             buffer = createIndexBuffer<osg::DrawElementsUInt>(flags, verts);
 
+        // Assign a EBO here to enable state sharing between different Geometries.
+        buffer->setElementBufferObject(new osg::ElementBufferObject);
+
         mIndexBufferMap[flags] = buffer;
         return buffer;
     }
diff --git a/components/terrain/terraingrid.cpp b/components/terrain/terraingrid.cpp
index e99126a2a8..7ae4d85116 100644
--- a/components/terrain/terraingrid.cpp
+++ b/components/terrain/terraingrid.cpp
@@ -104,6 +104,11 @@ void TerrainGrid::loadCell(int x, int y)
     osg::ref_ptr<osg::Vec3Array> normals (new osg::Vec3Array);
     osg::ref_ptr<osg::Vec4Array> colors (new osg::Vec4Array);
 
+    osg::ref_ptr<osg::VertexBufferObject> vbo (new osg::VertexBufferObject);
+    positions->setVertexBufferObject(vbo);
+    normals->setVertexBufferObject(vbo);
+    colors->setVertexBufferObject(vbo);
+
     mStorage->fillVertexBuffers(0, 1, center, positions, normals, colors);
 
     osg::ref_ptr<osg::Geometry> geometry (new osg::Geometry);