[vtkusers] Run VTK with OpenGL ES 2.0 backend

[Dan Lipsa]

Konrad,
I believe OpenGL ES is only supported for mobile architectures
https://blog.kitware.com/building-vtk-for-mobile-architectures/

The desktop version, including the version compiled for EGL requires full
OpenGL
https://blog.kitware.com/off-screen-rendering-through-the-native-platform-interface-egl/

Dan


On Wed, Jun 27, 2018 at 11:33 AM Konrad LEY <konrad.ley at valeo.com> wrote:

> Hello,
>
> I'm trying to run VTK on a Ultra96 board, which has a Mali-400 MP2 gpu
> supporting OpenGL ES 2.0.
> According to https://blog.kitware.com/raspberry-pi-likes-vtk/ VTK has a
> OpenGL ES 2.0 backend and runs on EGL.
> So I installed the libmali-dev package of my petalinux linux distribution,
> which is providing me the following files:
>
> /usr/include/EGL/egl.h
> /usr/include/EGL/eglext.h
> /usr/include/EGL/eglplatform.h
> /usr/include/GLES/gl.h
> /usr/include/GLES/glext.h
> /usr/include/GLES/glplatform.h
> /usr/include/GLES2/gl2.h
> /usr/include/GLES2/gl2ext.h
> /usr/include/GLES2/gl2platform.h
> /usr/include/KHR/khrplatform.h
> /usr/lib/libEGL.so
> /usr/lib/libGLESv1_CM.so
> /usr/lib/libGLESv2.so
> /usr/lib/libMali.so
> /usr/lib/pkconfig/egl.pc
> /usr/lib/pkconfig/glesv1.pc
> /usr/lib/pkconfig/glesv1_cm.pc
> /usr/lib/pkgconfig/glesv2.pc
>
> I can compile and run examples using OpenGL ES 2.0 now.
>
> Then I downloaded latest VTK-8.1.1 and ran cmake in the build folder. It
> complained about not finding OpenGL so I also installed libgl-mesa-dev
> package which is providing me:
>
> /usr/include/GL/gl.h
> /usr/include/GL/gl_mangle.h
> /usr/include/GL/glcorearb.h
> /usr/include/GL/glext.h
> /usr/include/GL/interal/dri_interface.h
> /usr/include/GL/mesa_glinterop.h
> /usr/include/GL/osmesa.h
> /usr/include/GL/wglext.h
> /usr/lib/libGL.la
> /usr/lib/libGL.so
> /usr/lib/pkgconfig/gl.pc
>
> After that CMake configuration completed.
>
> In the CMakeCache.txt I found out that VTK_HAS_EGL was set to OFF. I
> turned it ON.
> Then cmake complained about not finding EGL. So I had to manually set
>
> EGL_INCLUDE_DIR=/usr/include/EGL
> EGL_LIBRARY=/usr/lib/libEGL.so
> EGL_opengl_LIBRARY=/usr/lib/libGLESv2.so
>
> Compiling and installing works fine, but when I run the Sphere example it
> returns the error:
>
>  ~# ./Sphere
>  libGL error: unable to load driver: xilinx_drm_dri.so
>  libGL error: driver pointer missing
>  libGL error: failed to load driver: xilinx_drm
>  ERROR: In
> /home/root/Downloads/VTK-8.1.1/Rendering/OpenGL/vtkOpenGLRenderWindow.cxx,
> line 785
>  vtkXOpenGLRenderWindow (0x25503fc0): GLEW could not be initialized.
>
>  Segmentation fault
>
> How can I build for OpenGL ES 2.0 only?
>
> Correct me but I think there's something wrong when I have to install
> OpenGL with the libgl-mesa-dev package. Also GLEW is for Desktop OpenGL
> only?
>
> --
> Viele Grüße / Best regards / Sincères
> <http://dict.leo.org/frde/index_de.html#/search=Sinc%C3%A8res&searchLoc=1&resultOrder=basic&multiwordShowSingle=on&pos=2>
>  salutations
> <http://dict.leo.org/frde/index_de.html#/search=salutations&searchLoc=1&resultOrder=basic&multiwordShowSingle=on&pos=2>
> Konrad Ley
>
> System Engineer Software
> Comfort and Driving Assistance Systems (CDA)
> Driving Assistance Research (DAR)
> Site Kronach
> Hummendorfer Str. 72
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>
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