[vtk-developers] [VTK 0012385]: Please don't exclude Intel GPU's from VolumeRendering/vtkOpenGLGPUVolumeRayCastMapper.cxx

[Dominique Belhachemi]

Hi,

A gerrit patch is ready for a review.
http://review.source.kitware.com/#change,2184

I hope it can make it in the 5.8 release so that Intel GPU user can
report their experience with VTK.

Thanks
Dominique


On Wed, Jul 20, 2011 at 7:58 PM, Mantis Bug Tracker
<mantis at public.kitware.com> wrote:
>
> The following issue has been SUBMITTED.
> ======================================================================
> http://vtk.org/Bug/view.php?id=12385
> ======================================================================
> Reported By:                domibel
> Assigned To:
> ======================================================================
> Project:                    VTK
> Issue ID:                   12385
> Category:                   (No Category)
> Reproducibility:            have not tried
> Severity:                   minor
> Priority:                   urgent
> Status:                     backlog
> Project:                    TBD
> Type:                       usability
> ======================================================================
> Date Submitted:             2011-07-20 18:58 CDT
> Last Modified:              2011-07-20 18:58 CDT
> ======================================================================
> Summary:                    Please don't exclude Intel GPU's from
> VolumeRendering/vtkOpenGLGPUVolumeRayCastMapper.cxx
> Description:
> Hi,
>
> Intel GPU's contain as usual the substring "Mesa" in the OpenGL renderer string.
>
> e.g.: Mesa DRI Mobile Intel® GM45 Express Chipset GEM 20091221 2009Q4
> x86/MMX/SSE2
>
> The following code excludes all those GPU's. I think this check should be
> removed. It is better to inform the user what OpenGL feature is missing.
>
>
> in VolumeRendering/vtkOpenGLGPUVolumeRayCastMapper.cxx:2160
>
>  const char *gl_version=reinterpret_cast<const char
> *>(glGetString(GL_VERSION));
>  if(strstr(gl_version,"Mesa")!=0)
>    {
>    // - GL_VENDOR cannot be used because it can be "Brian Paul" or
>    // "Mesa project"
>    // - GL_RENDERER cannot be used because it can be "Software Rasterizer" or
>    // "Mesa X11"
>    // - GL_VERSION is more robust. It has things like "2.0 Mesa 7.0.4" or
>    // "2.1 Mesa 7.2" or "2.1 Mesa 7.3-devel"
>    // Mesa does not work with multiple draw buffers:
>    // "framebuffer has bad draw buffer"
>    // "render clipped 1 ERROR (x506) invalid framebuffer operation ext"
>    this->LoadExtensionsSucceeded=0;
>    return;
>    }
>
>
> Thanks
> Dominique
> ======================================================================
>
> Issue History
> Date Modified    Username       Field                    Change
> ======================================================================
> 2011-07-20 18:58 domibel        New Issue
> ======================================================================
>
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