[Mesa-dev] spec/!OpenGL 3.0/gl-3.0-texture-integer fails on r600g

[Marek Olšák]

If I understand the code correctly, value[3] should be 1.

If it were 0, the bias would be 1, therefore adding 1 and clamping the
alpha (because of the RGBA8 colorbuffer) would always return 1 no
matter what the texture fetch returned.

Anyway, if the texture fetch returned 0xffffffff, the test would
incorrectly pass due to the clamping, so I think expected[3] should be
changed to some number that is between 0 and 1 for all formats.

Marek


On Fri, Aug 9, 2013 at 1:22 PM, Martin Andersson <g02maran at gmail.com> wrote:
> I think I have found an issue in the piglit test.
>
> Marek, could you take a look at the attached patch and see if it looks
> correct. If so I will send it to the piglit list.
>
> //Martin
>
> On Tue, Aug 6, 2013 at 11:20 PM, Marek Olšák <maraeo at gmail.com> wrote:
>> Sorry, I have no idea. You can try to remove support for RGBX integer
>> formats and see if it helps.
>>
>> In is_format_supported, return FALSE for all R?G?B?X_?INT formats.
>>
>> Marek
>>
>> On Sat, Aug 3, 2013 at 11:51 AM, Martin Andersson <g02maran at gmail.com> wrote:
>>> Well, I should have been more clear. If I do this:
>>>
>>> 263: value[3] = 0;
>>> 290: expected[3] = 1.0;
>>>
>>> The test always passes, but if I only do this:
>>>
>>> 290: expected[3] = 1.0;
>>>
>>> The test fails with this error:
>>>
>>> texture-integer: failure with format GL_RGB8I_EXT:
>>>   texture color = 92, 126, 14, 104
>>>   expected color = 0.25, 0.5, 0.75, 1
>>>   result color = 0.25098, 0.501961, 0.74902, 0
>>> PIGLIT: {'result': 'fail' }
>>>
>>> //Martin
>>>
>>> On Sat, Aug 3, 2013 at 5:23 AM, Marek Olšák <maraeo at gmail.com> wrote:
>>>> FragShaderText contains the shader code. Anyway, we have found the
>>>> issue: expected[3] should really be set to 1.0, because RGB formats
>>>> must return (r,g,b,1). It's a bug in the piglit test.
>>>>
>>>> Marek
>>>>
>>>> On Fri, Aug 2, 2013 at 11:44 PM, Martin Andersson <g02maran at gmail.com> wrote:
>>>>> On Fri, Aug 2, 2013 at 2:52 PM, Marek Olšák <maraeo at gmail.com> wrote:
>>>>>> The format doesn't have alpha. See what the texture fetch writes to
>>>>>> the alpha channel.
>>>>>
>>>>> I looked at the code but I can't figure out where the texture fetch
>>>>> happens, could you point me in the right direction?
>>>>>
>>>>>>
>>>>>> You may try setting "texture-integer.c:290" to "expected[3] = 1.0;"
>>>>>
>>>>> The test passes if I do that.
>>>>>
>>>>> //Martin
>>>>>
>>>>>>
>>>>>> Marek
>>>>>>
>>>>>> On Fri, Aug 2, 2013 at 2:15 PM, Martin Andersson <g02maran at gmail.com> wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I started to look at why the spec/!OpenGL 3.0/gl-3.0-texture-integer
>>>>>>> sometimes fails on my AMD 6950, using mesa master. It fails with
>>>>>>> errors like this:
>>>>>>>
>>>>>>> texture-integer: failure with format GL_RGB8I_EXT:
>>>>>>>   texture color = 100, 9, 71, 0
>>>>>>>   expected color = 0.25, 0.5, 0.75, 0
>>>>>>>   result color = 0.25098, 0.501961, 0.74902, 1
>>>>>>> PIGLIT: {'result': 'fail' }
>>>>>>>
>>>>>>> When I ran the test a bunch of times I found that it only failed when
>>>>>>> the last texture color was zero. So when I changed this code in the
>>>>>>> pigilt test:
>>>>>>>
>>>>>>> value[0] = rand() % max;
>>>>>>> value[1] = rand() % max;
>>>>>>> value[2] = rand() % max;
>>>>>>> value[3] = rand() % max;
>>>>>>>
>>>>>>> to this:
>>>>>>>
>>>>>>> value[0] = rand() % max;
>>>>>>> value[1] = rand() % max;
>>>>>>> value[2] = rand() % max;
>>>>>>> value[3] = 0;
>>>>>>>
>>>>>>> The test always fails.
>>>>>>>
>>>>>>> I found this bug https://bugs.freedesktop.org/show_bug.cgi?id=63664
>>>>>>> But I can't reproduce this bug on my intel G45 (running mesa 9.1.5).
>>>>>>>
>>>>>>> Anyone know what is causing this or how I could debug it further?
>>>>>>>
>>>>>>> //Martin
>>>>>>> _______________________________________________
>>>>>>> mesa-dev mailing list
>>>>>>> mesa-dev at lists.freedesktop.org
>>>>>>> http://lists.freedesktop.org/mailman/listinfo/mesa-dev