[Piglit] [PATCH] Add glsl-1.10/execution/fs-discard-deep-branch.shader_test

[Tapani Pälli]

Reviewed-by: Tapani Pälli <tapani.palli at intel.com>

On 07/26/2016 11:12 AM, Nicolai Hähnle wrote:
> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
>
> Extracted from a bug in the Mesa GLSL compiler that was triggered by
> Firewatch. I will also send out a patch for Mesa.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96762
> ---
>  .../execution/fs-discard-deep-branch.shader_test   | 42 ++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 tests/spec/glsl-1.10/execution/fs-discard-deep-branch.shader_test
>
> diff --git a/tests/spec/glsl-1.10/execution/fs-discard-deep-branch.shader_test b/tests/spec/glsl-1.10/execution/fs-discard-deep-branch.shader_test
> new file mode 100644
> index 0000000..63be51b
> --- /dev/null
> +++ b/tests/spec/glsl-1.10/execution/fs-discard-deep-branch.shader_test
> @@ -0,0 +1,42 @@
> +# This tests discard in nested if-statements. The additional code in the outer
> +# if-statement caused this to miscompile in Mesa.
> +
> +[require]
> +GLSL >= 1.10
> +SIZE 20 20
> +
> +[vertex shader passthrough]
> +
> +[fragment shader]
> +uniform bool use_discard;
> +uniform float boundary;
> +uniform vec4 color;
> +
> +void main()
> +{
> +	if (use_discard) {
> +		float tmp;
> +		tmp = boundary * 0.5;
> +		if (gl_FragCoord.x < tmp)
> +			discard;
> +	}
> +
> +	gl_FragColor = color;
> +}
> +
> +[test]
> +clear color 1.0 0.0 0.0 1.0
> +clear
> +
> +uniform uint use_discard 1
> +uniform float boundary 20.0
> +uniform vec4 color 0.0 1.0 0.0 1.0
> +
> +draw rect -1 -1 2 2
> +probe rect rgba (0, 0, 10, 20) (1.0, 0.0, 0.0, 1.0)
> +probe rect rgba (10, 0, 10, 20) (0.0, 1.0, 0.0, 1.0)
> +
> +uniform uint use_discard 0
> +uniform vec4 color 0.0 0.0 1.0 1.0
> +draw rect -1 -1 2 2
> +probe all rgba 0.0 0.0 1.0 1.0
>