[Piglit] [PATCH] add test for kepler texture waw hazard

[Brian Paul]

On 12/08/2015 11:49 AM, Ilia Mirkin wrote:
> On Tue, Dec 8, 2015 at 1:28 PM, Brian Paul <brianp at vmware.com> wrote:
>> On 12/08/2015 10:57 AM, Ilia Mirkin wrote:
>>>
>>> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
>>> ---
>>>    tests/bugs/texture-waw-hazard.shader_test | 36
>>> +++++++++++++++++++++++++++++++
>>
>>
>> I thought we were trying to get away from putting things in tests/bugs/.
>>
>> How about tests/spec/glsl-1.20/execution/ ?
>
> Sure, happy to move it. I had a similar feeling, but wasn't sure where
> to stick this... it's not testing functionality of any particular
> version of anything.

I suggested tests/spec/glsl-1.20/execution/ since the shader file says 
GLSL >= 1.20

-Brian


>
>    -ilia
>
>>
>> -Brian
>>
>>
>>>    1 file changed, 36 insertions(+)
>>>    create mode 100644 tests/bugs/texture-waw-hazard.shader_test
>>>
>>> diff --git a/tests/bugs/texture-waw-hazard.shader_test
>>> b/tests/bugs/texture-waw-hazard.shader_test
>>> new file mode 100644
>>> index 0000000..7af0d87
>>> --- /dev/null
>>> +++ b/tests/bugs/texture-waw-hazard.shader_test
>>> @@ -0,0 +1,36 @@
>>> +# This test triggers a WaW situation on Kepler+, where the color
>>> +# output is stored in registers $r0..$r3, and if the texture results
>>> +# are also stored there, we might forget a barrier before overwriting
>>> +# those registers with the green color value.
>>> +[require]
>>> +GLSL >= 1.20
>>> +
>>> +[vertex shader passthrough]
>>> +
>>> +[fragment shader]
>>> +#version 120
>>> +uniform sampler2D tex;
>>> +uniform bool false_val = false;
>>> +
>>> +void main()
>>> +{
>>> +       vec4 tex = texture2D(tex, vec2(0));
>>> +       if (false_val) {
>>> +               // Make sure that the texbar ends up in the false
>>> +               // branch. A plain copy might get optimized into
>>> +               // something that happens to work out.
>>> +               gl_FragColor = 0.5 * tex;
>>> +       } else {
>>> +               gl_FragColor = vec4(0, 1, 0, 1);
>>> +       }
>>> +}
>>> +
>>> +[test]
>>> +texture rgbw 0 ( 8 , 8 )
>>> +
>>> +clear color 0.1 0.1 0.1 0.1
>>> +clear
>>> +
>>> +uniform int tex 0
>>> +draw rect -1 -1 2 2
>>> +probe all rgba 0 1 0 1
>>>
>>