[Piglit] [PATCH 3/7] shaders: Stop using ortho in glsl-const tests.

[Matt Turner]

On Tue, Nov 5, 2013 at 9:36 AM, Ian Romanick <idr at freedesktop.org> wrote:
> On 11/04/2013 10:27 PM, Matt Turner wrote:
>> Scripted with sed with fix ups to
>>  - not - actually writes .w component, so probe rgba.
>>  - reflect - writes const 1.0 .w component, so probe rgb.
>>  - cosh - writes const 1.0 .w component, and used probe rgb with 4
>>    components, so drop the .w from the probe.
>
> I'm unsure about removing the 'clear'.  It seems like we put that in for
> a reason, but it was about 100 years ago.

The tests draw small green squares onto a cleared background, so I
think the clear is just because we're not drawing over the whole
surface and want some defined values. But now that we're drawing the
whole window, we shouldn't need it, like most other piglit tests.