[vtkusers] vtkgl::GenBuffers

[John Biddiscombe]

You need to make sure the extensions are loaded before using them, use 
something like this...

  //
  // Test support for Framebuffers
  //
  int supports_GL_EXT_framebuffer_object  = 
extensions->ExtensionSupported("GL_EXT_framebuffer_object");
  int supports_GL_ARB_texture_float       = 
extensions->ExtensionSupported("GL_ARB_texture_float");
  int supports_GL_ARB_texture_rectangle   = 
extensions->ExtensionSupported("GL_ARB_texture_rectangle");
  int supports_GL_ARB_color_buffer_float  = 
extensions->ExtensionSupported("GL_ARB_color_buffer_float");

then...

  //
  // Set FrameBufferObject flags depending on test results
  //
  if (!supports_GL_EXT_framebuffer_object ||
      !supports_GL_ARB_texture_float ||
      !supports_GL_ARB_texture_rectangle ||
      !supports_GL_ARB_color_buffer_float)
  {
    this->FrameBufferExtensionsOK = 0;
  }
  else {
    this->FrameBufferExtensionsOK = 1;
    extensions->LoadExtension("GL_EXT_framebuffer_object");
    extensions->LoadExtension("GL_ARB_texture_float");
    extensions->LoadExtension("GL_ARB_texture_rectangle");
    extensions->LoadExtension("GL_ARB_color_buffer_float");
    this->InitFrameBuffer();
  }


> Hi,
> I cannot access vtkgl::GenBuffers(...) from VTK. This is an OpenGL 
> Extension command from (ARB_pixel_buffer_object).
> Access violation...
>
> Has anyone experiences with this?
>
> Thanks,
> Eugen
>
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-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/about/BJohn.php
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82