[Mesa-dev] [Bug 84566] Unify the format conversion code

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Oct 28 06:10:33 PDT 2014


--- Comment #44 from Iago Toral <itoral at igalia.com> ---
(In reply to Iago Toral from comment #43)
> 3) Luminance formats have special requirements. A conversion to Luminance
> from RGBA requires to do L=R+G+B for example. This is something that
> _mesa_format_convert cannot achieve at the moment, because neither
> pack/unpack functions nor _mesa_swizzle_and_convert do this kind of
> operation, so I wonder what is the right thing to do here. We could run
> another pass that computes these values after the conversion. We could do
> this inside _mesa_format_convert or in the client, after calling
> _mesa_format_convert I suppose there are no other options. The current code
> does another pass specifically for this, right before packing to the dst.

And likewise, a conversion to RGBA from Luminance requires to do
R=L,G=0,B=0,A=1, but unpack functions and _mesa_swizzle_and_convert will do
R=L,G=L,B=L,A=1, so again we need another pass to correct this to the expected

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