Function SCR_UpdateScreen

code/client/cl_scrn.cpp:482–517

================== SCR_UpdateScreen This is called every frame, and can also be called explicitly to flush text to the screen. ================== */

==================
*/
void SCR_UpdateScreen( void ) {
	static int	recursive;

	if ( !scr_initialized ) {
		return;				// not initialized yet
	}

	// load the ref / ui / cgame if needed
	CL_StartHunkUsers();

	if ( ++recursive > 2 ) {
		Com_Error( ERR_FATAL, "SCR_UpdateScreen: recursively called" );
	}
	recursive = qtrue;

	// If there is no VM, there are also no rendering commands issued. Stop the renderer in
	// that case.
	if ( cls.uiStarted )
	{
		// if running in stereo, we need to draw the frame twice
		if ( cls.glconfig.stereoEnabled ) {
			SCR_DrawScreenField( STEREO_LEFT );
			SCR_DrawScreenField( STEREO_RIGHT );
		} else {
			SCR_DrawScreenField( STEREO_CENTER );
		}

		if ( com_speeds->integer ) {
			re.EndFrame( &time_frontend, &time_backend );
		} else {
			re.EndFrame( NULL, NULL );
		}
	}

	recursive = 0;
}

// this stuff is only used by the savegame (SG) code for screenshots...
//