[Piglit] [PATCH 00/14] Tests related to interface block redeclaration.

[Paul Berry]

I'm putting the finishing touches on a patch series for Mesa that
allows for redeclaration of the gl_PerVertex interface block.  This
series contains the tests I used to validate my Mesa work.

The GLSL 1.50 spec doesn't directly address how to redeclare elements
of the gl_PerVertex interface block, but the GLSL 4.10 spec does.  It
seems pretty clear that the rules in the GLSL 4.10 spec were intended
as a clarification, rather than a behavioural change, so I've based my
tests on the GLSL 4.10 spec, but applied them to GLSL 1.50.

A few patches don't relate directly to redeclaration of gl_PerVertex,
but rather cover Mesa bugs I discovered while working on interface
block redeclaration.  Patches 1 and 2 test some previously untested
uses of identifiers to make sure that they can't begin with the "gl_"
prefix.  Patches 4 and 5 test some things that should be prohibited in
general for interface blocks, such as redeclaring an existing
interface block, or declaring an interface block that conflicts with a
global variable.

The remaining patches are specific to redeclaration of gl_PerVertex.

[PATCH 01/14] Test that struct names may not begin with "gl_" prefix.
[PATCH 02/14] Test illegal usages of "gl_" prefix in interface blocks.
[PATCH 03/14] Test that redeclaration of gl_PerVertex must be for a subset.
[PATCH 04/14] Test that interface blocks cannot declare conflicting names.
[PATCH 05/14] Test that in general, interface blocks cannot be redeclared.
[PATCH 06/14] Test that the built-in gl_PerVertex interface block can be redeclared.
[PATCH 07/14] Test that gl_PerVertex can't be redeclared after it's been used.
[PATCH 08/14] Test that gl_PerVertex can't be redeclared multiple times in one shader.
[PATCH 09/14] Test that after redeclaration, absent members of gl_PerVertex can't be used.
[PATCH 10/14] Test that builtins can't be redeclared both inside and outside gl_PerVertex.
[PATCH 11/14] Test inter- and intra-stage gl_PerVertex matching rules.
[PATCH 12/14] Verify array-ness and instance name of gl_PerVertex redeclarations.
[PATCH 13/14] Verify that gl_PerVertex can't be redeclared in certain shader types.
[PATCH 14/14] Test that gl_in may be redeclared with an array size.