Modification to r8795 to sleep inside the loop that checks for availability of the occlusion query result.

ChangeLog

@@ -10,6 +10,7 @@ The following changes (and svn revision numbers) were included in the 2.6.1 rele
 8853 - Fix to osgUtil::Simplifier to handle shared vertex arrays correctly. Changes the Geometry interface, so forces a recompile.
 8888 - Fix for uninitialized "strip texture path" option in OpenFlight exporter.
 8900 - Fix for FLT plugin user data handling.
+Modification to r8795 to sleep inside the loop that checks for availability of the occlusion query result.
 Bump OSG version number from 2.6.0 to 2.6.1.
 Update wrappers.
 

src/osg/OcclusionQueryNode.cpp

@@ -239,10 +239,12 @@ struct RetrieveQueriesCallback : public osg::Camera::DrawCallback
             // code, we've seen crashes on 64-bit Mac/Linux NVIDIA systems doing
             // multithreaded, multipipe rendering (as in a CAVE).
             GLint ready( 0 );
+            ext->glGetQueryObjectiv( tr->_id, GL_QUERY_RESULT_AVAILABLE, &ready );
             while( !ready )
             {
+                OpenThreads::Thread::microSleep( 5 );
                 ext->glGetQueryObjectiv( tr->_id, GL_QUERY_RESULT_AVAILABLE, &ready );
-            };
+            }
 #endif
 
             ext->glGetQueryObjectiv( tr->_id, GL_QUERY_RESULT, &(tr->_numPixels) );