[Piglit] [PATCH] glsl-1.30: add linker test for inter stage in/out vars usage

[Timothy Arceri]

On 28/08/18 17:19, Vadim Shovkoplias wrote:
> Hi Timothy,
> 
> Thanks for the review! Can you please push this patch ?

Pushed. Thanks for the patch.

> 
> вт, 28 авг. 2018 г. в 3:45, Timothy Arceri <tarceri at itsqueeze.com 
> <mailto:tarceri at itsqueeze.com>>:
> 
>     Reviewed-by: Timothy Arceri <tarceri at itsqueeze.com
>     <mailto:tarceri at itsqueeze.com>>
> 
>     On 27/08/18 22:19, Vadym Shovkoplias wrote:
>      > This test exposes a Mesa GLSL linker bug. The test fails with the
>      > following error message:
>      >
>      >     error: fragment shader input `foo' has no matching output in
>     the previous
>      >            stage
>      >
>      > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105731
>      > Signed-off-by: Vadym Shovkoplias
>     <vadym.shovkoplias at globallogic.com
>     <mailto:vadym.shovkoplias at globallogic.com>>
>      > ---
>      >   ...rstage-multiple-vertex-objects.shader_test | 33
>     +++++++++++++++++++
>      >   1 file changed, 33 insertions(+)
>      >   create mode 100644
>     tests/spec/glsl-1.30/linker/interstage-multiple-vertex-objects.shader_test
>      >
>      > diff --git
>     a/tests/spec/glsl-1.30/linker/interstage-multiple-vertex-objects.shader_test
>     b/tests/spec/glsl-1.30/linker/interstage-multiple-vertex-objects.shader_test
>      > new file mode 100644
>      > index 000000000..dd168d434
>      > --- /dev/null
>      > +++
>     b/tests/spec/glsl-1.30/linker/interstage-multiple-vertex-objects.shader_test
>      > @@ -0,0 +1,33 @@
>      > +# Exercises a Mesa GLSL linker bug.
>      > +#
>      > +# Output "foo" variable is not used in the "main" vertex shader
>      > +# but used in fragment shader
>      > +
>      > +[require]
>      > +GLSL >= 1.30
>      > +
>      > +[vertex shader]
>      > +out vec4 foo;
>      > +void unused()
>      > +{
>      > +    foo=vec4(1);
>      > +}
>      > +
>      > +[vertex shader]
>      > +in vec4 pos;
>      > +void main()
>      > +{
>      > +    gl_Position = pos;
>      > +}
>      > +
>      > +[fragment shader]
>      > +in vec4 foo;
>      > +out vec4 color;
>      > +
>      > +void main()
>      > +{
>      > +    gl_FragColor=foo;
>      > +}
>      > +
>      > +[test]
>      > +link success
>      >
>