I´m trying to wrap my head around how to get this done, if at all possible. So basically I have a Area class, Map class and Tile class. My Area class is a singleton, and this is causing some confusion. I´m trying to draw like this: Background / Tiles / Entities / Overlay Tiles / UI.

void C_Application::OnRender()

{

// Fill the screen black
 SDL_FillRect( Surf_Screen, &Surf_Screen->clip_rect, SDL_MapRGB( Surf_Screen->format, 0x00, 0x00, 0x00 ) );

// Draw background

// Draw tiles
C_Area::AreaControl.OnRender(Surf_Screen, -C_Camera::CameraControl.GetX(), -C_Camera::CameraControl.GetY());

// Draw entities
for(unsigned int i = 0;i < C_Entity::EntityList.size();i++)
{
    if( !C_Entity::EntityList[i] )
    {

        continue;

    }

C_Entity::EntityList[i]->OnRender( Surf_Screen );

}

// Draw overlay tiles

// Draw UI

// Update the Surf_Screen surface
SDL_Flip( Surf_Screen);

}

Would be nice if someone could give a little input. Thanks.