[Piglit] [PATCH] textureSize: try retrieving multiple components to tickle a driver bug

[Ian Romanick]

On 04/21/2018 06:34 PM, Ilia Mirkin wrote:
> Nouveau does not merge the multiple requests together into one, which
> leads to an interesting pattern on nv50 (since dst reg == src reg) where
> we accidentally overwrite things we aren't supposed to.
> 
> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
> ---
>  .../execution/fs-textureSize-components.shader_test  | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 tests/spec/glsl-1.30/execution/fs-textureSize-components.shader_test
> 
> diff --git a/tests/spec/glsl-1.30/execution/fs-textureSize-components.shader_test b/tests/spec/glsl-1.30/execution/fs-textureSize-components.shader_test
> new file mode 100644
> index 000000000..d4671a7f3
> --- /dev/null
> +++ b/tests/spec/glsl-1.30/execution/fs-textureSize-components.shader_test
> @@ -0,0 +1,20 @@
> +[require]
> +GLSL >= 1.30
> +
> +[vertex shader]
> +#version 130
> +void main() { gl_Position = gl_Vertex; }

Can this use [vertex shader passthrough]?

> +
> +[fragment shader]
> +#version 130
> +uniform sampler2D tex;
> +void main()
> +{
> +    gl_FragColor = vec4(0,float(textureSize(tex, 0).x) / float(textureSize(tex, 0).y),0,1);
> +}
> +
> +[test]
> +texture checkerboard 0 0 (1024, 1024) (0.0, 0.0, 0.0, 0.0) (0.0, 0.0, 0.0, 0.0)
> +uniform int tex 0
> +draw rect -1 -1 2 2
> +relative probe rgb (0.75, 0.75) (0.0, 1.0, 0.0)