[Piglit] [PATCH v4] tests: add nvidia conservative rasterization tests

[Brian Paul]

On 03/30/2018 03:56 PM, Rhys Perry wrote:
> Adds tests for GL_NV_conservative_raster, GL_NV_conservative_raster_dilate
> and GL_NV_conservative_raster_pre_snap_triangles.
> 
> Changes in v2:
> - cleanup the tests
> - fix some test failures
> - remove the gles version of the dilation test as the extension is not
>    exposed in gl.xml
> Changes in v3:
> - fix accidently luck-based pre-snap-triangles test
> Changes in v4:
> - apply formatting changes
> - elaborate on various comments describing the test source code files
> 
> Signed-off-by: Rhys Perry <pendingchaos02 at gmail.com>
> ---
> I am new to this project and don't have commit access.

The code looks good to me.  Though, I discovered one issue: if I run:

bin/nv_conservative_raster-draw -auto

the test fails.  But if I add -fbo, then it passes.  Do you know why 
that is?

I'm testing w/ NVIDIA's driver and a GTX1050.

-Brian