[Piglit] [PATCH] hiz, new depth test

[Chad Versace]

On 11/05/2012 12:04 PM, Chad Versace wrote:
> On 10/31/2012 06:38 AM, Tapani Pälli wrote:
>> Hello,
>>
>> Here is a new test that tries to demonstrate failure with hiz code when
>> frambuffer depth and color do not match. This failure happens for example
>> with MESA_FORMAT_RGB565 color buffer and MESA_FORMAT_X8_Z24 depth buffer.
>>
>> This test seems to fail, however my suggested fix does not make it pass
>> either so I am a bit puzzled if I am testing here the right thing. My
>> suggested fix was to not use fast depth clear in this case which produces
>> good visual results with test applications, however this piglit test does
>> not pass.
>>
>> Any help appreciated;
> 
> I suspect that the test failure may be unrelated to hiz. The failing probes are
> *color* probes. I've ran the test in non-auto mode, and, at least visually,
> the color at the failing probe points are correct.
> 
> Maybe Piglit or Mesa is handling RGB565 incorrectly? I'm still looking into it.

I found it. Adding `piglit_set_tolerance_for_bits(5, 6, 5, 0)` to the top of
piglit_display() fixes the test.

On what gen do you expect the test to fail? It passes for me on Sandybridge.

-Chad