[Mesa-dev] Help! CopyImageSubData is defeating me

[Jason Ekstrand]

On June 25, 2017 1:40:09 PM Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> On Sun, Jun 25, 2017 at 4:33 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
>>> Anyone have thoughts on this? Am I being foolish for trying to hold
>>> onto GL_RGBA4 texturing? (Any decision here also affects st/nine.)
>>
>>
>> Yes.  Chances are that you're also doing texture views wrong.  Are there any
>> 4444 formats supported on nvidia hardware?
>
> Well, any permutation of a 4444 format is easily supportable for texturing.
>
> What's wrong with the texture views? Should be fine... unless I'm
> missing something. It's really just this issue with RB <-> Texture
> copies where the RB's internal format is GL_RGBA4 while the *real*
> internal format is RGBA8. Texture views between e.g. RGB565 and
> RGBA4444 should work fine (and the fb will fail to validate as one
> might expect if one were to attach a GL_RGBA4 texture view of a
> GL_RGB565 texture).

But what if you have a 4444 and you render to as 4444 and then try to 
texture from it as 565?