[Piglit] [PATCH] arb_tessellation_shader: add execution test for barrier

[Chris Forbes]

Would be nicer not to draw over itself -- if we need multiple
variants, they should be separate tests, or draw to non-overlapping
areas.

This + the communication via `patch out` variant discussed in IRC:

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

On Thu, Aug 28, 2014 at 2:35 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
> ---
>  .../execution/barrier.shader_test                  | 86 ++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 tests/spec/arb_tessellation_shader/execution/barrier.shader_test
>
> diff --git a/tests/spec/arb_tessellation_shader/execution/barrier.shader_test b/tests/spec/arb_tessellation_shader/execution/barrier.shader_test
> new file mode 100644
> index 0000000..8ac74f0
> --- /dev/null
> +++ b/tests/spec/arb_tessellation_shader/execution/barrier.shader_test
> @@ -0,0 +1,86 @@
> +[require]
> +GLSL >= 1.50
> +GL_ARB_tessellation_shader
> +
> +[vertex shader passthrough]
> +
> +[tessellation control shader]
> +#extension GL_ARB_tessellation_shader: require
> +layout(vertices = 6) out;
> +
> +out int val[];
> +patch out vec4 pcolor;
> +
> +void main() {
> +       gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
> +        if (gl_InvocationID < val.length())
> +                val[gl_InvocationID] = gl_InvocationID;
> +
> +        pcolor = vec4(0, 1, 0, 1);
> +
> +        barrier();
> +
> +        for (int i = 0; i < val.length(); i++) {
> +                 // Switch things up so that each invocation checks
> +                 // different locations
> +                 int index = (i + gl_InvocationID) % val.length();
> +                 if (val[index] != index)
> +                         pcolor = vec4(1, 0, 0, 1);
> +        }
> +
> +       gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 0.0);
> +       gl_TessLevelInner = float[2](0.0, 0.0);
> +}
> +
> +
> +[tessellation evaluation shader]
> +#extension GL_ARB_tessellation_shader: require
> +layout(triangles) in;
> +
> +patch in vec4 pcolor;
> +out vec4 color;
> +
> +void main() {
> +       gl_Position = gl_in[0].gl_Position * gl_TessCoord[0]
> +                   + gl_in[1].gl_Position * gl_TessCoord[1]
> +                   + gl_in[2].gl_Position * gl_TessCoord[2];
> +        color = pcolor;
> +}
> +
> +
> +[fragment shader]
> +in vec4 color;
> +void main()
> +{
> +       gl_FragColor = color;
> +}
> +
> +[vertex data]
> +piglit_vertex/float/2
> +-1.0 -1.0
> + 1.0 -1.0
> +-1.0  1.0
> +-1.0  1.0
> + 1.0 -1.0
> + 1.0  1.0
> +-1.0  1.0
> + 1.0 -1.0
> + 1.0  1.0
> +-1.0  1.0
> + 1.0 -1.0
> + 1.0  1.0
> +
> +[test]
> +clear color 0.0 0.0 0.0 1.0
> +clear
> +
> +patch parameter vertices 3
> +draw arrays GL_PATCHES 0 6
> +probe all rgba 0.0 1.0 0.0 1.0
> +
> +clear color 0.0 0.0 0.0 1.0
> +clear
> +
> +patch parameter vertices 6
> +draw arrays GL_PATCHES 0 12
> +probe all rgba 0.0 1.0 0.0 1.0
> --
> 1.8.5.5
>
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