Merging r6039 through r6072 from trunk to ogl-es branch.

Note: Not yet caught up with trunk.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6114 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLCoreRenderTarget.h

@@ -274,6 +274,9 @@ public:
 					AssignedDepth = false;
 					AssignedStencil = false;
 				}
+#ifdef _DEBUG
+				Driver->testGLError(__LINE__);
+#endif
 
 				RequestDepthStencilUpdate = false;
 			}