https://bugs.freedesktop.org/show_bug.cgi?id=63117
--- Comment #1 from Kevin Hobbs <hob...@ohiou.edu> ---
Since OSMesa switched to the Gallium driver VTK tests which use OSMesa produce
black output images.
Before the change VTK's LoadOpenGLExtension test had :
GL_VERSION: 2.1 Mesa 9.2-devel (git-6173cc1)
GL_RENDERER: Mesa OffScreen
in the output, and after the change it had :
GL_VERSION: 2.1 Mesa 9.2.0 (git-f7ef83c)
GL_RENDERER: Gallium 0.4 on llvmpipe (LLVM 3.0, 128 bits)
VTK sets up the OSMesa contest like this :
contextId = OSMesaCreateContext(GL_RGBA, NULL);
OSMesaMakeCurrent(contextId, window, GL_UNSIGNED_BYTE, xsize, ysize);
VTK gets the image data from OSMesa like:
MakeCurrent();
while(glGetError() != GL_NO_ERROR) {};
glReadBuffer(front_or_back);
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