[vtk-developers] OpenGL Extension loading with OSMesa?

[burlen]

Hi Kathleen,

I need this functionality and am starting to work on it, it won't be 
ready for vtk 6. I'm curious to see if anyone else is already working on 
it. Please speak up if so.

I'm just digging in but my understanding is that VTK provides it's own 
extension wrangler (Utilities/ParseOGLExt) for compile time creation of 
headers (vtkgl.h), and an extension manager vtkOpenGLExtensionManager 
for run time api to check the results. However, in the cmake code there 
is logic such that when X11 is disabled or not present, the extension 
wrangler/pareser is not run. Also like the previous post mentioned the 
parser is not aware of OSMesaGetProcAddress, thus at run time the 
extension manager knows nothing about the extensions os mesa provides. 
So currently OSMesa without X11 means no extensions are available.

Burlen

On 04/15/2013 02:32 PM, Kathleen S. Biagas wrote:
> Just wanted to ping the list again, see if anyone has an answer to
> Cyrus' question?
>
> Kathleen
>
> On Tue, 2013-03-05 at 14:07 -0800, Cyrus Harrison wrote:
>> Hi Everyone,
>>
>> I have been hunting for quite a bit with no luck - so I am hoping the
>> experts can give me a ruling here:
>>
>> Looking at VTK-6 source from git, I was expecting to find
>> `OSMesaGetProcAddress' wired into the guts of VTK somewhere to support
>> OpenGL extensions for the OSMesa case.
>>
>> Does that logic exist or does OSMesa simply result in a configuration
>> that defines "VTK_NO_EXTENSION_LOADING"?
>>
>>
>> Thanks for your help,
>> -Cyrus
>>
>>
>>
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