[Piglit] [PATCH v3] glsl-4.50: add a test for helper invocations

[Ilia Mirkin]

On Thu, Nov 12, 2015 at 5:22 PM, Glenn Kennard <glenn.kennard at gmail.com> wrote:
> Tested on r600g implementation
>
> Signed-off-by: Glenn Kennard <glenn.kennard at gmail.com>
> ---
> Ported to desktop GL 4.5 from Ilia's GLES test case, needed since r600g uses
> coarse derivatives by default, and shader control over that requires
> GL_ARB_derivative_control.
>
>  .../execution/helper-invocation.shader_test        | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 tests/spec/glsl-4.50/execution/helper-invocation.shader_test
>
> diff --git a/tests/spec/glsl-4.50/execution/helper-invocation.shader_test b/tests/spec/glsl-4.50/execution/helper-invocation.shader_test
> new file mode 100644
> index 0000000..d72d490
> --- /dev/null
> +++ b/tests/spec/glsl-4.50/execution/helper-invocation.shader_test
> @@ -0,0 +1,30 @@
> +[require]
> +GL >= 4.5
> +GLSL >= 4.50
> +GL_ARB_derivative_control
> +
> +[vertex shader passthrough]
> +
> +[fragment shader]
> +#version 450
> +#extension GL_ARB_derivative_control : require

This shouldn't be necessary -- mesa should be fixed rather than adding
this here. [Also remove from requirements above.]

> +precision highp float;

This was just for ES, not needed here.

With the above 2 fixed,

Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>

> +out vec4 color;
> +void main() {
> +  float helper = float(gl_HelperInvocation);
> +  color = vec4(abs(dFdxFine(helper)), abs(dFdyFine(helper)), 0, 1);
> +}
> +
> +[test]
> +clear color 0.2 0.2 0.2 0.2
> +clear
> +
> +# A single pixel being drawn, guaranteed that both the X and Y
> +# derivatives will be 1.
> +draw rect ortho 0 0 1 1
> +probe rect rgba (0, 0, 1, 1) (1, 1, 0, 1)
> +
> +# A larger rect being drawn, check that the first 2x2 quad, all of
> +# which is definitely going to be covered, actually ended up as all 0's
> +draw rect ortho 2 2 10 10
> +probe rect rgba (2, 2, 2, 2) (0, 0, 0, 1)
> --
> 1.9.1
>
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