[Piglit] [PATCH v2 1/2] shaders: add test to check (0 cmp x+y) optimization

[Matt Turner]

On Sun, Mar 1, 2015 at 11:31 PM, Samuel Iglesias Gonsalvez
<siglesias at igalia.com> wrote:
> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
> ---
>
> v2:
> * Implement it as shader_runner test
>
>  tests/shaders/glsl-opt-0-cmp-xy.shader_test | 33 +++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 tests/shaders/glsl-opt-0-cmp-xy.shader_test
>
> diff --git a/tests/shaders/glsl-opt-0-cmp-xy.shader_test b/tests/shaders/glsl-opt-0-cmp-xy.shader_test
> new file mode 100644
> index 0000000..57c5716
> --- /dev/null
> +++ b/tests/shaders/glsl-opt-0-cmp-xy.shader_test
> @@ -0,0 +1,33 @@
> +/* Test (0 cmp x+y) optimization. */
> +
> +[require]
> +GLSL >= 1.10
> +
> +[vertex shader]

You can use [vertex shader passthrough] and drop the vertex shader body.

> +
> +void main()
> +{
> +       gl_Position = ftransform();
> +}
> +
> +[fragment shader]
> +
> +uniform float a;
> +
> +void main()
> +{
> +       if (0.0 >= (a - 1.0))
> +           gl_FragColor = vec4(0, 1, 0, 1);
> +       else
> +           gl_FragColor = vec4(1, 0, 0, 1);
> +}
> +
> +[test]
> +clear color 0.5 0.5 0.5 0.5
> +clear

You can remove these two lines since the test is painting the whole window.

Reviewed-by: Matt Turner <mattst88 at gmail.com>

Thanks!