[Piglit] [PATCH] arb_copy_image: add new format swizzle test

[Ilia Mirkin]

On Tue, Sep 1, 2015 at 12:22 PM, Fredrik Höglund <fredrik at kde.org> wrote:
> On Tuesday 01 September 2015, Brian Paul wrote:
>> On 08/31/2015 05:38 PM, Ilia Mirkin wrote:
>> > On Mon, Aug 31, 2015 at 7:29 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>> >> Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>
>> >>
>> >> Thanks a lot for doing this! I assume that it fails with your gallium
>> >> ARB_copy_image implementation as I predicted?
>>
>> Yes.  In Mesa, I added some code that checks for swizzles and uses
>> pipe_context::blit() instead.  Seems to fix things, but I need to spend
>> more time on it.
>
> This test is not sufficient though, because it's when you have a copy
> from B8G8R8A8 to R16G16, or a similar situation, that things get really
> interesting.

Yeah, so the thing is that you can't do this with unsized internal
formats, since they're not part of the view classes, but you could
(carefully) arrange for a *sized* internal format, like GL_RGBA8 to
come out as a BGRA pipe format, and then try to copy it to RG16. And
enjoy the fireworks :)

But the test is a great start, still has my r-b.

  -ilia