[Piglit] [PATCH] glsl-1.10: test for rotating a variable components in a loop

[Ilia Mirkin]

On Tue, Sep 1, 2015 at 9:02 PM, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> This test fails on r600 with sb enabled, it does something
> similiar to what a lot of the CTS test cases do.
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>  .../fs-while-loop-rotate-value.shader_test         | 32 ++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>  create mode 100644 tests/spec/glsl-1.10/execution/fs-while-loop-rotate-value.shader_test
>
> diff --git a/tests/spec/glsl-1.10/execution/fs-while-loop-rotate-value.shader_test b/tests/spec/glsl-1.10/execution/fs-while-loop-rotate-value.shader_test
> new file mode 100644
> index 0000000..cb08b0f
> --- /dev/null
> +++ b/tests/spec/glsl-1.10/execution/fs-while-loop-rotate-value.shader_test
> @@ -0,0 +1,32 @@
> +# test to check a bug in r600 sb backend
> +# it miscompiles this due to the 1.0
> +# at the end wierdly.
> +[require]
> +GLSL >= 1.10

Is this allowed in GLSL 1.10? (Having a non-compile-time-resolvable loop)

> +
> +[vertex shader]

[vertex shader passthrough]

> +void main()
> +{
> +  gl_Position = gl_Vertex;
> +}
> +
> +[fragment shader]
> +uniform int count;
> +uniform vec4 init_val;
> +
> +void main()
> +{
> +       vec4 out_val = init_val;
> +       int i = 0;
> +       while (i++ < count) {
> +               out_val = out_val.yzwx;
> +       }
> +       gl_FragColor = vec4(out_val.xyz, 1.0);
> +}
> +
> +[test]
> +uniform int count 3
> +uniform vec4 init_val 0.25 0.5 0.75 1.0
> +
> +draw rect -1 -1 2 2
> +probe all rgba 1.0 0.25 0.5 1.0

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

BTW, there's also a tests/shaders/ssa if you prefer to place it in
there... IIRC it has a similar test, but I guess this one's different
enough.

> --
> 2.4.3
>
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