[Piglit] [PATCH] Test that ES frag shader with invariant outputs compiles

[Dylan Baker]

Please do not put anything in tests/glslparsertest/, these tests belong in in
tests/spec/glsl-es-1.00 and tests/spec/glsl-es-3.00 respectively.

Quoting Danylo Piliaiev (2019-01-09 09:35:16)
> In all GLSL ES versions output variables in fragment shader are allowed
> to be invariant.
> 
>  From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 1.00 spec:
>  "Only the following variables may be declared as invariant:
>    ...
>    - Built-in special variables output from the fragment shader."
> 
>  From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 3.00 spec:
>  "Only variables output from a shader can be candidates for invariance."
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107842
> 
> Signed-off-by: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
> ---
>  .../glslparsertest/shaders/invariant.V100.frag | 18 ++++++++++++++++++
>  .../glslparsertest/shaders/invariant.V300.frag | 16 ++++++++++++++++
>  2 files changed, 34 insertions(+)
>  create mode 100644 tests/glslparsertest/shaders/invariant.V100.frag
>  create mode 100644 tests/glslparsertest/shaders/invariant.V300.frag
> 
> diff --git a/tests/glslparsertest/shaders/invariant.V100.frag b/tests/glslparsertest/shaders/invariant.V100.frag
> new file mode 100644
> index 000000000..a6463d1dd
> --- /dev/null
> +++ b/tests/glslparsertest/shaders/invariant.V100.frag
> @@ -0,0 +1,18 @@
> +// [config]
> +// expect_result: pass
> +// glsl_version: 1.00
> +//
> +// [end config]
> +
> +/* From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 1.00 spec:
> + *
> + *     "Only the following variables may be declared as invariant:
> + *      Built-in special variables output from the fragment shader."
> + */
> +
> +#version 100
> +
> +invariant gl_FragColor;
> +invariant gl_FragData;
> +
> +void main() { }
> diff --git a/tests/glslparsertest/shaders/invariant.V300.frag b/tests/glslparsertest/shaders/invariant.V300.frag
> new file mode 100644
> index 000000000..8d7707d8c
> --- /dev/null
> +++ b/tests/glslparsertest/shaders/invariant.V300.frag
> @@ -0,0 +1,16 @@
> +// [config]
> +// expect_result: pass
> +// glsl_version: 3.00
> +//
> +// [end config]
> +
> +/* From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 3.00 spec:
> + *
> + *     "Only variables output from a shader can be candidates for invariance."
> + */
> +
> +#version 300 es
> +
> +invariant out highp vec4 test;
> +
> +void main() { }
> -- 
> 2.20.1
> 
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