[vtkusers] Run VTK with OpenGL ES 2.0 backend

[Konrad LEY]

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
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Konrad Ley

System Engineer Software
Comfort and Driving Assistance Systems (CDA)
Driving Assistance Research (DAR)
Site Kronach
Hummendorfer Str. 72
96317 Kronach

Phone:
E-Mail: konrad.ley at valeo.com <vorname.nachname at valeo.com>

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