[vtk-developers] vtkGenericOpenGLRenderWindow crashes TestSetGet

[David Gobbi]

Hi Brad,

It seems that vtkTextureUnitManager isn't in
vtkRenderingOpenGLHierarchy.txt, so the wrappers no longer
automatically exclude methods that use it as a parameter.  I'll
look into this, I think that something is missing either from the
CMakeLists.txt or from one of the cmake wrapping macros.
The new BTX/ETX behavior that was brought into VTK in 5.8
is documented here:

http://www.vtk.org/Wiki/VTK/Remove_BTX_ETX

I need to add a "Wrapping" section to the wiki that links to the
various wiki pages that are related to wrapping... there's a fair bit
of documentation for the wrappers, but none of it is easy to find.

 - David


On Fri, May 11, 2012 at 9:08 AM, Brad King <brad.king at kitware.com> wrote:
> Hi Folks,
>
> TestSetGet currently crashes:
>
>  http://open.cdash.org/testDetails.php?test=145727028&build=2266971
>
> when running against a Mesa GL library.  It appears to call
> glGetString(GL_RENDERER) without a GL context.
>
> At some point during the modularization transition the Tcl wrappers
> started seeing vtkOpenGLRenderWindow::GetTextureUnitManager even
> though it is in a BTX/ETX block (David G?).  That exposes this
> existing problem.
>
> Essentially the test runs
>
>  package require vtk
>  vtkGenericOpenGLRenderWindow x
>  x GetTextureUnitManager
>
> but one can simplify it to
>
>  package require vtk
>  vtkGenericOpenGLRenderWindow x
>  [x GetHardwareSupport] GetNumberOfTextureUnits
>
> or even just
>
>  vtkGenericOpenGLRenderWindow x
>  [x GetExtensionManager] ExtensionSupported "GL_VERSION_2_0"
>
> The method vtkOpenGLExtensionManager::ExtensionSupported has:
>
>  const char *gl_renderer=
>    reinterpret_cast<const char *>(glGetString(GL_RENDERER));
>
> but it is not safe to call glGetString without a context.
>
> -Brad