Unless I've missed something it seems that right now when it comes to certain classes of post-processing OpenCL is somewhat crippled by its inability to read multisampled image buffers effectively requiring all buffers rendered from OpenGL to be resolved before use.

This might be better suited as an optional extension and maybe only on 'GPU' devices, however as DirectCompute can do it this would be a useful feature to have.

(While it would be nice to have multisample write functionality I'd personally settle for read functionality for now )