The stencil-extension is most useful! Great to see AMD get more serious about OpenGL.
Now i would really like to see an extension that allows to also write the blend-color (per MRT) to influence the blend-function. It should be very similar to this stencil-extension.
GL_ARB_blend_func_extended – not yet documented – Increadible: an ARB extension that is not documented and even NVIDIA does not expose yet this extension…
GL_ARB_fragment_coord_conventions: This extension provides alternative conventions for the fragment coordinate XY location available for programmable fragment processing. Also exposed by NVIDIA (see HERE).
GL_EXT_texture_buffer_object_rgb32: not yet documented and not exposed by NVIDIA ForceWare