[Mesa-dev] [Bug 92706] glBlitFramebuffer refuses to blit RGBA to RGB with MSAA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92706

--- Comment #2 from Ian Romanick <idr at freedesktop.org> ---
(In reply to Neil Roberts from comment #1)
> It looks like in GL 4.4 they have completely removed the restriction that
> MSAA resolve blits need to have the same format. In the section entitled
> “Changes in the released Specification of July 22, 2013” it says:
> 
> “Relax BlitFramebuffer in section 18.3.1 so that format conversion can take
> place during multisample blits, since drivers already allow this and some
> apps depend on it.”

Often we take changes like this as, basically, spec bug fixes that should apply
to older versions as well.  Since other drivers allow this and later specs
allow it, we should too.

> Maybe we should just entirely remove the restriction in Mesa too. On the
> Intel driver the multisample resolve is implemented as a shader so I don't
> think allowing all format conversions would cause any problems.

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