[Piglit] [PATCH] hiz, new depth test

Tapani Pälli tapani.palli at intel.com
Fri Nov 9 03:02:22 PST 2012

On 11/05/2012 10:09 PM, Chad Versace wrote:
> 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

It fails for me on Ivybridge, this is platform where the original bug 
also occured where some of the apps do not render correctly on Android 
(only background color / solid fill is seen on the screen), what is 
common with these apps is the use of 16bit color buffer and 24 bit depth 
buffer. My following mesa patch fixes the issue in Android:


// Tapani

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