[vtkusers] android examples openGL ES 2.0

[Francesco R]

Dear vtk users and developers,
I recently asked for suggestions on this problem on the ARM Mali Graphics
community. You can find the post at https://community.arm.com/message/34034

Two issues have been found:
1. draw calls in VTK are using type=GL_UNSIGNED_INT. However, this type is
supported only for GLES30, but not for GLES20. So, I fear that current vtk
master is not compatible with GLES20.
2. it is suggest that too many eglMakeCurrent are being made.

As concerns 1., I basically replaced all occurences of GL_UNSIGNED_INT
with GL_UNSIGNED_SHORT in Rendering/OpenGL2. Of course this is probably not
the correct approach, because the result is not as expected (I modified the
examples to render only the sphere, but I can see less than a quarter of
it), but at least now I can see some rendering on my screen.

Do you have any suggestion on how to proceed now? Thanks

On Tue, Jan 5, 2016 at 2:20 PM, Francesco R <francesco81492 at gmail.com>
wrote:

> Ok. I posted logcat and gltrace files, is there anything else that I can
> do to help debug the issue? Thanks
>
> On Tue, Jan 5, 2016 at 1:57 PM, Ken Martin <ken.martin at kitware.com> wrote:
>
>> The system I tested on is a Mali 628 MP6 GPU running 5.0.2 (support ES 20
>> and 3.0).  The Mali 400 is old but its specs say that it supports OpenGL ES
>> 2.0 so it should work.
>>
>> Thanks
>> Ken
>>
>> On Tue, Jan 5, 2016 at 7:28 AM, Francesco R <francesco81492 at gmail.com>
>> wrote:
>>
>>> Thanks Dr. Martin for you reply. I just recompiled the current master
>>> with API 19 (the version of android installed on the device is 4.4) and I
>>> can confirm that I have the same issues as in my first email. Do you think
>>> it can be related to my particular GPU (ARM Mali 400 MP)? What GPU do you
>>> have on your device? Thank you!
>>>
>>> On Mon, Jan 4, 2016 at 4:29 PM, Ken Martin <ken.martin at kitware.com>
>>> wrote:
>>>
>>>> I'm not sure what the issue is. I just checked and the Native app is
>>>> working on my device. I just rebuilt and used API level 21 and
>>>> OPENGL_ES_VERSION set to 2.0
>>>>
>>>> - Ken
>>>>
>>>> On Sun, Dec 20, 2015 at 3:09 PM, Francesco R <francesco81492 at gmail.com>
>>>> wrote:
>>>>
>>>>>
>>>>> Dear vtk users and developers,
>>>>> I am currently trying to run the two android examples with OpenGL ES
>>>>> 2.0 backend available in vtk 7.0.0 rc1, on an ARM Mali 400 MP GPU.
>>>>> Unfortunately, I am not able to run neither of them on the device.
>>>>>
>>>>> NativeVTK crashes at Rendering/OpenGL2/vtkShaderProgram.cxx, line 399
>>>>> with "Shader object was not initialized, cannot attach it."
>>>>> See also http://pastebin.com/Wvew3gen for the full log.
>>>>>
>>>>> JavaVTK appears to interact correctly with the user (see
>>>>> http://pastebin.com/w3Sdu7CC ), but only a blue background is shown.
>>>>> The trace file obtained with the android device monitor is available at
>>>>> http://filebin.ca/2QdKao08I3lb/trace1.gltrace
>>>>>
>>>>> Do you have any suggestion on what could be the issue?
>>>>>
>>>>> Thanks
>>>>>
>>>>>
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>>>>
>>>>
>>>> --
>>>> Ken Martin PhD
>>>> Chairman & CFO
>>>> Kitware Inc.
>>>> 28 Corporate Drive
>>>> Clifton Park NY 12065
>>>> 518 371 3971
>>>>
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>>>
>>>
>>
>>
>> --
>> Ken Martin PhD
>> Chairman & CFO
>> Kitware Inc.
>> 28 Corporate Drive
>> Clifton Park NY 12065
>> 518 371 3971
>>
>> This communication, including all attachments, contains confidential and
>> legally privileged information, and it is intended only for the use of the
>> addressee.  Access to this email by anyone else is unauthorized. If you are
>> not the intended recipient, any disclosure, copying, distribution or any
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>> received this communication in error please notify us immediately and
>> destroy the original message.  Thank you.
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>
>
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