[Piglit] [PATCH 2/2] arb_compute_shader: A simple CS test with SSBO

[Chris Forbes]

Looks correct -- exercises reads and writes, and only works if std430's
tighter packing works.

Reviewed-by: Chris Forbes <chrisf at ijw.co.nz>

On Wed, Sep 30, 2015 at 1:10 PM, Jordan Justen <jordan.l.justen at intel.com>
wrote:

> Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
> ---
>  .../execution/basic-ssbo.shader_test               | 74
> ++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644
> tests/spec/arb_compute_shader/execution/basic-ssbo.shader_test
>
> diff --git
> a/tests/spec/arb_compute_shader/execution/basic-ssbo.shader_test
> b/tests/spec/arb_compute_shader/execution/basic-ssbo.shader_test
> new file mode 100644
> index 0000000..4bf7e1c
> --- /dev/null
> +++ b/tests/spec/arb_compute_shader/execution/basic-ssbo.shader_test
> @@ -0,0 +1,74 @@
> +[require]
> +GLSL >= 3.30
> +GL_ARB_compute_shader
> +GL_ARB_shader_storage_buffer_object
> +GL_ARB_shader_atomic_counters
> +
> +[compute shader]
> +#version 330
> +#extension GL_ARB_compute_shader: enable
> +#extension GL_ARB_shader_storage_buffer_object: require
> +#extension GL_ARB_shader_atomic_counters: require
> +
> +#define SIZE 256u
> +
> +layout(local_size_x = SIZE) in;
> +
> +layout(binding = 0) uniform atomic_uint counter;
> +
> +layout(std430)
> +buffer SSBO {
> +       uint    u[SIZE];
> +};
> +
> +uniform uint mode;
> +
> +void main()
> +{
> +       uint index = gl_LocalInvocationIndex;
> +
> +       switch (mode) {
> +       case 0u:
> +               u[index] = SIZE;
> +               break;
> +       case 1u:
> +               u[index] = index;
> +               break;
> +       case 2u:
> +               if (u[index] == SIZE)
> +                       atomicCounterIncrement(counter);
> +               break;
> +       case 3u:
> +               if (u[index] == index)
> +                       atomicCounterIncrement(counter);
> +               break;
> +       }
> +}
> +
> +[test]
> +atomic counters 1
> +ssbo 1024
> +
> +uniform uint mode 0
> +compute 1 1 1
> +probe atomic counter 0 == 0
> +
> +uniform uint mode 3
> +compute 1 1 1
> +probe atomic counter 0 == 0
> +
> +uniform uint mode 2
> +compute 1 1 1
> +probe atomic counter 0 == 256
> +
> +uniform uint mode 1
> +compute 1 1 1
> +probe atomic counter 0 == 256
> +
> +uniform uint mode 2
> +compute 1 1 1
> +probe atomic counter 0 == 256
> +
> +uniform uint mode 3
> +compute 1 1 1
> +probe atomic counter 0 == 512
> --
> 2.5.1
>
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