[Mesa-dev] [PATCH 6/6] mesa: fix NUM_COMPRESSED_TEXTURE_FORMATS query

Ian Romanick idr at freedesktop.org
Thu Oct 31 18:45:11 CET 2013

On 10/31/2013 10:21 AM, Marek Olšák wrote:
> On Thu, Oct 31, 2013 at 6:19 PM, Ian Romanick <idr at freedesktop.org> wrote:
>> On 10/31/2013 08:42 AM, Marek Olšák wrote:
>>> From: Marek Olšák <marek.olsak at amd.com>
>>> Cc: mesa-stable at lists.freedesktop.org
>> This is not correct.  GL_COMPRESSED_TEXTURE_FORMATS is only supposed to
>> return texture formats "suitable for general-purpose usage."  Since
>> GL_COMPRESSED_RGBA_S3TC_DXT1_EXT only has 1 bit for alpha, it's not
>> suitable for general-purpose usage.  As far as I'm aware, nobody else
>> returns that format either... and I think we have a piglit test.
> Yes, we have a piglit test which expects 4 formats, not 3.

tests/spec/arb_texture_compression/invalid-formats.c expects that
GL_COMPRESSED_RGBA_S3TC_DXT1_EXT is not included in

It looks like tests/spec/gl-3.1/minmax.c expects
GL_NUM_COMPRESSED_TEXTURE_FORMATS be at least 4, but I have no idea what
it's expecting GL_COMPRESSED_TEXTURE_FORMATS will be.  There are no
general-purpose compression formats part of the spec (only RGTC
formats), so... I think that's also a spec bug, and I've submitted a
Khronos bug for that too.  Ugh. :(

> Marek

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