In OpenGL, is it possible to use multisample anti-aliasing only on edge pixels and sample each other pixel only once in order to improve performance?
In other words, I want to treat edge pixels and non-edge pixels differently, and sample multiple points for each edge pixel, while only sampling the center point for each non-edge pixel.
I have tried to Google this but I have not found any sources that discuss this; however, this video about the graphics in Manifold Garden suggests that they use a form of MSAA only on pixels that are close to an edge.