[Mesa-dev] [Mesa-stable] [PATCH 1/2] mesa: default DEPTH_TEXTURE_MODE should be RED in the core profile

[Marek Olšák]

There are a couple of reasons why this was missed:

1) The depth texture mode doesn't exist in the core profile, so the
core spec doesn't and cannot specify what the default should be, so
that's why nobody updated it. However the 4.1 core spec says:

"3.8.9 Depth Component Textures
Depth textures and the depth components of depth/stencil textures can
be treated as RED textures during texture filtering and application
(see section 3.8.16). The initial state for depth and depth/stencil
textures treats them as RED textures."


2) The default TBO format is LUMINANCE8 according to the ARB_tbo spec,
so apparently the default value was copied from there. However the GL
core spec is different again and says R8 is the default format. This
was also missed because the piglit test expects LUMINANCE8 and also
because proprietary drivers don't support 3.1 without
ARB_compatibility (I assume the piglit tests had been tested on
proprietary drivers first).

I guess we should stop exposing ARB_tbo, because it conflicts with the
GL core spec.

BTW I have also sent some fixes for piglit. We just lack a test for
the depth textures being treated as RED by default.

Marek

On Mon, Jul 22, 2013 at 10:52 PM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> On 07/22/2013 10:37 AM, Ian Romanick wrote:
>>
>> Crap.  I thought we had already done this.  Do we have a piglit test for
>> this?  I'm just curious how we missed it...
>>
>> Either way, both patches are
>>
>> Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
>
>
> I'm very skeptical of these patches, having looked at it a bunch - I'll try
> and find time to respond properly today or tomorrow.