[vtk-developers] OSMessa Build Failures

[Kevin H. Hobbs]

On 03/13/2013 03:14 PM, David Gobbi wrote:
> 
> These are the only calls and they look very ordinary.  On the other side of
> the equation, the tests grab the images with code like this:
> 
> MakeCurrent();
> while(glGetError() != GL_NO_ERROR) {};
> glReadBuffer(front_or_back);
>

As is the tests fail with a black image.

Other drivers are now available for use with OSMesa.

By changing the driver I can get a different but still wrong, output image:

http://crab-lab.zool.ohiou.edu/kevin/LoadOpenGLExtension.png

So the problem may very well be on the output side.

> This also looks quite ordinary.  Of course there are a lot of gl calls
> in between CreateContext and ReadBuffer.
> 

This made me laugh out loud.

OSMesa is now using the same driver as the onscreen Mesa builds of VTK I
submit. I'm hoping it's just a case of gl getting the wrong pixels.


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