virgl: Always assume that ORIGIN_UPPER_LEFT and PIXEL_CENTER* are supported

virgl: Always assume that ORIGIN_UPPER_LEFT and PIXEL_CENTER* are supported

The driver must support at least one of

  PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT
  PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT

and one of

  PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER
  PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER

otherwise glsl_to_tgsi will fire an assert.

ORIGIN_UPPER_LEFT is the default convention, and is supported by
all mesa drivers, hence it seems reasonable to always report the caps
to be enabled.  On gles ORIGIN_LOWER_LEFT is generally not supported,
so we rely on the caps reported by the host that depend on whether we
run on an GL or an EGL host.

For PIXEL_CENTER it is completely host driver dependend on what is
supported, and since we do not report the actual host driver capabilities
it is best to mark both as supported, this is how it works for a GL
host too.

Fixes:
   dEQP-GLES3.functional.shaders.builtin_variable.fragcoord_xyz
   dEQP-GLES3.functional.shaders.metamorphic.bubblesort_flag.variant_1
   dEQP-GLES3.functional.shaders.metamorphic.bubblesort_flag.variant_2

Reviewed-by: Gurchetan Singh <gurcetansingh@chromium.org>
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>