[PyOpenCL] OpenGl Support in pyopencl in Mac OS X 10.6

[Holger Rapp]

Hi,

Am 20.07.2010 um 19:31 schrieb Andreas Kloeckner:

> On Tue, 20 Jul 2010 08:53:02 +0200, Holger Rapp <holger.rapp at kit.edu> wrote:
>> Hi,
>> 
>>>> I tried running the gl_interop_demo.py and hit a wall right away again:
>>>> Traceback (most recent call last):
>>>> File "gl_interop_demo.py", line 74, in <module>
>>>>   initialize()
>>>> File "gl_interop_demo.py", line 34, in initialize
>>>>   props = [(ctx_props.PLATFORM, plats[0]), (ctx_props.GL_CONTEXT_KHR,
>>>> AttributeError: type object 'context_properties' has no attribute 'GL_CONTEXT_KHR'
>>>> 
>>>> Which is true, there is no such variable defined in the class. There is only platform, to_string and mro defined.
>>> 
>>> Try uncommenting the cl_ext.h header include in
>>> src/wrapper/wrap_cl.hpp. I'm reluctant to do this by default yet because
>>> Nvidia doesn't seem to ship that header.
> 
>> I added the include at the Mac Include section around line 14 and made sure that it really was included (by first adding a wrong file name and see the compile fail). The compile works, but the situation is the very same as described before. None of the GL_* variables are defined inside context_properties.
>> 
>> Anything more I could try?
> 
> Can you check if the device you are running on is supposed to support
> the cl_khr_gl_sharing extension?
I have two OpenCL devices, one is my CPU and the other is my GPU:

In [6]: cl.get_platforms()
Out[6]: [<pyopencl.Platform 'Apple' at 0x7fff0000>]
In [7]: cl.get_platforms()[0].get_devices()
Out[7]: 
[<pyopencl.Device 'GeForce 8800 GS' at 0x1022600>,
 <pyopencl.Device 'Intel(R) Core(TM)2 Duo CPU     E8435  @ 3.06GHz' at 0x1020400>]

First my GeForce:
In [9]: cl.get_platforms()[0].get_devices()[0].get_info(cl.device_info.EXTENSIONS)
Out[9]: 'cl_khr_byte_addressable_store cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_APPLE_gl_sharing cl_APPLE_SetMemObjectDestructor cl_APPLE_ContextLoggingFunctions '

So it only lists cl_APPLE_gl_sharing. What is this all about? The very same for my CPU:

In [10]: cl.get_platforms()[0].get_devices()[1].get_info(cl.device_info.EXTENSIONS)
Out[10]: 'cl_khr_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_APPLE_gl_sharing cl_APPLE_SetMemObjectDestructor cl_APPLE_ContextLoggingFunctions '

I found this document:
http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/gl_sharing.html

> Also, can you find the cl_gl.h header
> and see if it contains the declarations for cl_khr_gl_sharing?
Nope, it doesn't. It contains some definitions for cl_APPLE_gl_sharing though. 

> 
> You can see what the declarations should look like in this spec header:
> http://www.khronos.org/registry/cl/api/1.1/cl_gl.h
The header on my system looks extremely similar, but ends after the declaration of clEnqueueReleaseGLObjects. Especially all the defines below this point are not in my header. 


Cheers,
Holger