[Piglit] [PATCH] glsl-1.10: Add tests for common gl_FrontFacing ternary usage.

[Ilia Mirkin]

On Thu, Jan 8, 2015 at 3:26 PM, Matt Turner <mattst88 at gmail.com> wrote:
> These patterns
>
>         gl_FrontFacing ?  1.0 :  1.0
>         gl_FrontFacing ? -1.0 : -1.0

Presumably these were meant to be ? -1 : 1 and ? 1 : -1

>         gl_FrontFacing ?  0.0 : -1.0
>
> are recognized and optimized by the i965 driver.
> ---
>  .../fs-frontfacing-ternary-0.0-neg-1.0.shader_test   | 20 ++++++++++++++++++++
>  .../fs-frontfacing-ternary-1.0-neg-1.0.shader_test   | 20 ++++++++++++++++++++
>  .../fs-frontfacing-ternary-neg-1.0-1.0.shader_test   | 20 ++++++++++++++++++++
>  3 files changed, 60 insertions(+)
>  create mode 100644 tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-0.0-neg-1.0.shader_test
>  create mode 100644 tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1.0-neg-1.0.shader_test
>  create mode 100644 tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-neg-1.0-1.0.shader_test
>
> diff --git a/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-0.0-neg-1.0.shader_test b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-0.0-neg-1.0.shader_test
> new file mode 100644
> index 0000000..2ac9224
> --- /dev/null
> +++ b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-0.0-neg-1.0.shader_test
> @@ -0,0 +1,20 @@
> +[require]
> +GLSL >= 1.10
> +
> +[vertex shader passthrough
> +
> +[fragment shader]
> +void main()
> +{
> +       float f = gl_FrontFacing ? 0.0 : -1.0;
> +       f = f * 0.5 + 0.75; // Remap (0.0, -1.0) -> (0.75, 0.25)
> +       gl_FragColor = vec4(0.0, f, 0.0, 1.0);
> +}
> +
> +[test]
> +draw rect -1 -1 2 1
> +draw rect 1 0 -2 1
> +relative probe rgba (0, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (1, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (0, 1) (0.0, 0.25, 0.0, 1.0)
> +relative probe rgba (1, 1) (0.0, 0.25, 0.0, 1.0)
> diff --git a/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1.0-neg-1.0.shader_test b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1.0-neg-1.0.shader_test
> new file mode 100644
> index 0000000..b4e6360
> --- /dev/null
> +++ b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1.0-neg-1.0.shader_test
> @@ -0,0 +1,20 @@
> +[require]
> +GLSL >= 1.10
> +
> +[vertex shader passthrough
> +
> +[fragment shader]
> +void main()
> +{
> +       float f = gl_FrontFacing ? 1.0 : -1.0;
> +       f = f * 0.25 + 0.5; // Remap (1.0, -1.0) -> (0.75, 0.25)
> +       gl_FragColor = vec4(0.0, f, 0.0, 1.0);
> +}
> +
> +[test]
> +draw rect -1 -1 2 1
> +draw rect 1 0 -2 1
> +relative probe rgba (0, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (1, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (0, 1) (0.0, 0.25, 0.0, 1.0)
> +relative probe rgba (1, 1) (0.0, 0.25, 0.0, 1.0)
> diff --git a/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-neg-1.0-1.0.shader_test b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-neg-1.0-1.0.shader_test
> new file mode 100644
> index 0000000..47a1eda
> --- /dev/null
> +++ b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-neg-1.0-1.0.shader_test
> @@ -0,0 +1,20 @@
> +[require]
> +GLSL >= 1.10
> +
> +[vertex shader passthrough
> +
> +[fragment shader]
> +void main()
> +{
> +       float f = gl_FrontFacing ? -1.0 : 1.0;
> +       f = f * -0.25 + 0.5; // Remap (-1.0, 1.0) -> (0.75, 0.25)
> +       gl_FragColor = vec4(0.0, f, 0.0, 1.0);
> +}
> +
> +[test]
> +draw rect -1 -1 2 1
> +draw rect 1 0 -2 1
> +relative probe rgba (0, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (1, 0) (0.0, 0.75, 0.0, 1.0)
> +relative probe rgba (0, 1) (0.0, 0.25, 0.0, 1.0)
> +relative probe rgba (1, 1) (0.0, 0.25, 0.0, 1.0)
> --
> 2.0.4
>
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