Fix problem with new vertex_array_bgra extension on OSX. Thanks to Auria for...

Fix problem with new vertex_array_bgra extension on OSX. Thanks to Auria for online debugging this issue.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3624 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.cpp

@@ -1720,7 +1720,9 @@ void COpenGLDriver::draw2DVertexPrimitiveList(const void* vertices, u32 vertexCo
 
 	if (vertices)
 	{
-#if defined(GL_ARB_vertex_array_bgra) || defined(GL_EXT_vertex_array_bgra)
+//due to missing defines in OSX headers, we have to be more specific with this check
+//#if defined(GL_ARB_vertex_array_bgra) || defined(GL_EXT_vertex_array_bgra)
+#ifdef GL_BGRA
 		if (FeatureAvailable[IRR_ARB_vertex_array_bgra] || FeatureAvailable[IRR_EXT_vertex_array_bgra])
 		{
 			switch (vType)
@@ -1738,8 +1740,12 @@ void COpenGLDriver::draw2DVertexPrimitiveList(const void* vertices, u32 vertexCo
 		}
 		else
 #endif
+		{
+			// avoid passing broken pointer to OpenGL
+			_IRR_DEBUG_BREAK_IF(ColorBuffer.size()==0);
 			glColorPointer(4, GL_UNSIGNED_BYTE, 0, &ColorBuffer[0]);
 		}
+	}
 
 	switch (vType)
 	{