[Piglit] [PATCH piglit] Add a test case for all of the modes of BPTC texture compression

[Marek Olšák]

Well, the meta code is pretty much an Intel-specific thing, because
other drivers which are being actively worked on do not use it. One
way to test compression and decompression is to add support to the
fbo-generatemipmap-formats test, because mipmap generation is done
entirely in software for non-renderable formats.

Marek

On Thu, Jul 24, 2014 at 7:08 PM, Neil Roberts <neil at linux.intel.com> wrote:
> Ilia Mirkin <imirkin at alum.mit.edu> writes:
>
>> Is there a way to read back the image once it's compressed that
>> ensures that software would be used to unpack it? If so, just compare
>> that using the texture in a shader == reading it back post
>> compression.
>
> I don't think there is a way to do that for the normalized formats
> because glGetTexImage is actually implemented using a render via the
> Mesa meta code so it's effectively always decompressed using a render.
>
> For the half-float modes it would work to use glGetTexImage to invoke
> the software decompressor because for some reason the meta code disables
> itself for non-normalized formats. However it's probably not very good
> to rely on this because we should really fix the meta code path to work
> for non-normalized formats too.
>
> - Neil
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