Merge a GL thing from Atys branch

nel/src/3d/driver/opengl/driver_opengl_extension.cpp

@@ -1584,6 +1584,14 @@ void	registerGlExtensions(CGlExtensions &ext)
 {
 	H_AUTO_OGL(registerGlExtensions);
 
+#ifdef NL_OS_MAC
+	CGLContextObj ctx = CGLGetCurrentContext();
+	if (ctx == NULL)
+	{
+		nlerror("No OpenGL context set");
+	}
+#endif
+
 	// OpenGL 1.2 ??
 	const char	*nglVersion = (const char *)glGetString (GL_VERSION);
 

nel/src/3d/driver/opengl/driver_opengl_window.cpp

@@ -1072,6 +1072,9 @@ bool CDriverGL::setDisplay(nlWindow wnd, const GfxMode &mode, bool show, bool re
 	[_ctx flushBuffer];
 	[_glView display];
 
+	// Set context as thread context
+	CGLSetCurrentContext((CGLContextObj)[_ctx CGLContextObj]);
+
 	_EventEmitter.init(this, _glView, _DestroyWindow);
 
 #elif defined(NL_OS_UNIX)