[Piglit] [PATCH 2/2] arb_direct_state_access: New test for GetCompressedTextureImage.

[Ilia Mirkin]

On Tue, Feb 17, 2015 at 4:34 PM, Ian Romanick <idr at freedesktop.org> wrote:
> "Dependencies
>
>     OpenGL 2.0 is required."
>
> This means Mesa will need a flag for the extension because there are
> pre-2.0 drivers.  Every DSA function will need to check the flag and
> possibly generate GL_INVALID_OPERATION.
>
> If we only support core profile (and always enable it in core profile),
> the functions won't even be put in the dispatch table for non-core.  No
> flag, and no checks in the functions.
>
> So, the $64,000.00 question is: Do we care to support DSA on the few
> cards that can do 2.0 but not 3.1?

Here's a view of some of the hardware that's stuck in GL2-land... not
exhaustive:

http://people.freedesktop.org/~imirkin/glxinfo/glxinfo.html#p=compat

So that's basically pre-gen6 intel, NV4x (GeForce 6000 / 7000 series),
AMD/ATI r300-r500, and the Adreno gpu's. (And presumably VC4.) Click
around the diff mesa versions, I don't have every hw for every mesa
version.

What's the downside of enabling this in GL1.x drivers BTW? e.g. nv3x
won't report GL2 (in Mesa) due to NPOT, and all the GeForce <= 4
series due to lack of... features. Not that I really care either way,
but just want to make sure there's a reason for it.

Cheers,

  -ilia