Cross-compiling Kivy to ARM i.MX6DL

[Cleiton Bueno]

Build a Linux Embedded and installed all dependencies for Kivy and performed successfully cross-compiling.


** Cross-compiling:

Using distutils
Detected Cython version 0.23
NOTE: Found GLES 2.0 headers at /usr/include/GLES2/gl2.h
Using this graphics system: OpenGL ES 2
SDL2: found SDL header at /usr/include/SDL2/SDL.h
SDL2: found SDL_mixer header at /usr/include/SDL2/SDL_mixer.h
SDL2: found SDL_ttf header at /usr/include/SDL2/SDL_ttf.h
SDL2: found SDL_image header at /usr/include/SDL2/SDL_image.h
running build
running build_py
running build_ext
Build configuration is:
 * use_rpi = 0
 * use_mali = 0
 * use_egl = 0
 * use_opengl_es2 = 1
 * use_opengl_debug = 0
 * use_glew = 0
 * use_sdl2 = 1
 * use_ios = 0
 * use_mesagl = 0
 * use_x11 = 0
 * use_gstreamer = 1
 * use_avfoundation = 0
 * use_osx_frameworks = 0
 * debug_gl = 0
 * debug = False
Detected compiler is unix
cythoning kivy/core/text/_text_sdl2.pyx to kivy/core/text/_text_sdl2.c
building 'kivy.core.text._text_sdl2' extension
creating build/temp.linux-armv7l-2.7
creating build/temp.linux-armv7l-2.7/kivy
creating build/temp.linux-armv7l-2.7/kivy/core
creating build/temp.linux-armv7l-2.7/kivy/core/text
...
creating /usr/share/kivy-examples/3Drendering
copying examples/3Drendering/objloader.py -> /usr/share/kivy-examples/3Drendering
copying examples/3Drendering/main.py -> /usr/share/kivy-examples/3Drendering
copying examples/3Drendering/monkey.obj -> /usr/share/kivy-examples/3Drendering
copying examples/3Drendering/simple.glsl -> /usr/share/kivy-examples/3Drendering
copying examples/kv/app_camera.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_fbo.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_button.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_stencil.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_layout.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_video.kv -> /usr/share/kivy-examples/kv
copying examples/kv/builder_template.py -> /usr/share/kivy-examples/kv
copying examples/kv/app_scatter.kv -> /usr/share/kivy-examples/kv
copying examples/kv/app_logo.kv -> /usr/share/kivy-examples/kv
copying examples/kv/kvrun.py -> /usr/share/kivy-examples/kv
copying examples/kv/kivy.jpg -> /usr/share/kivy-examples/kv
running install_egg_info
Writing /usr/lib/python2.7/site-packages/Kivy-1.9.1-py2.7.egg-info



** Running regular Kivy:

root@colibri-imx6:~# python -c "import kivy"
[INFO              ] [Logger      ] Record log in /home/root/.kivy/logs/kivy_16-05-27_6.txt
[INFO              ] [Kivy        ] v1.9.2-dev0
[INFO              ] [Python      ] v2.7.11 (default, May 21 2016, 16:26:47)
[GCC 5.3.0]
root@colibri-imx6:~#



** But when performing a simple project I get the following error:

root@colibri-imx6:# python /opt/kivy/examples/tutorials/pong/main.py
[INFO   ] [Logger      ] Record log in /home/root/.kivy/logs/kivy_16-05-28_1.txt
[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v2.7.11 (default, May 21 2016, 16:26:47)
[GCC 5.3.0]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2 (img_pil, img_ffpyplayer ignored)
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[CRITICAL] [Window      ] Unable to find any valuable Window provider at all!
egl_rpi - ImportError: cannot import name bcm
  File "/usr/lib/python2.7/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
    fromlist=[modulename], level=0)
  File "/usr/lib/python2.7/site-packages/kivy/core/window/window_egl_rpi.py", line 12, in <module>
    from kivy.lib.vidcore_lite import bcm, egl

sdl2 - RuntimeError: Failed loading fbGetDisplay: /usr/lib/libEGL.so.1: undefined symbol: _fbGetDisplay
  File "/usr/lib/python2.7/site-packages/kivy/core/__init__.py", line 67, in core_select_lib
    cls = cls()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/window_sdl2.py", line 138, in __init__
    super(WindowSDL, self).__init__()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/__init__.py", line 722, in __init__
    self.create_window()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/window_sdl2.py", line 237, in create_window
    self.fullscreen, resizable, state)
  File "kivy/core/window/_window_sdl2.pyx", line 80, in kivy.core.window._window_sdl2._WindowSDL2Storage.setup_window (kivy/core/window/_window_sdl2.c:1976)
    self.die()
  File "kivy/core/window/_window_sdl2.pyx", line 55, in kivy.core.window._window_sdl2._WindowSDL2Storage.die (kivy/core/window/_window_sdl2.c:1568)
    raise RuntimeError(<bytes> SDL_GetError())

x11 - ImportError: No module named window_x11
  File "/usr/lib/python2.7/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
    fromlist=[modulename], level=0)

[CRITICAL] [App         ] Unable to get a Window, abort.


I've tried with git branch stable version and 1.9.2.dev0, I get the same error.





** I want to work with Linux framebuffer, I'm testing with fb-test in fbida and it works!


** I set something variable environment? Or what can I check?


--
Att,
Cleiton Bueno

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[Alexander Taylor]

It looks like an EGL related problem. I don't really know anything about this, but maybe kivy is assuming an extension that isn't present (it could be Kivy's fault). There's been a little discussion about this recently, you might have more luck asking about it on the irc channel.

[Cleiton Bueno]

Oh really?
I researched libEGL and some expressions in the historic IRC but found nothing concrete.
I.MX6 see great potential, it would be interesting to explore the VIVANTE.

[Cleiton Bueno]

Resolved parts.
I cross-compiling libs EGL, GLESv2 i.MX6 and copied to the target (libEGL-fb.so, libGLESv2.so, libGAL-fb.so and libVIVANTE.so) and renomiei taking the -fb.

Another error now:

root@colibri-imx6:~# python /usr/share/kivy-examples/canvas/canvas_stress.py
[INFO   ] [Logger      ] Record log in /home/root/.kivy/logs/kivy_16-05-31_8.txt

[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v2.7.11 (default, May 21 2016, 16:26:47)
[GCC 5.3.0]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2 (img_pil, img_ffpyplayer ignored)

[INFO   ] [Text        ] Provider: sdl2

[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2

[CRITICAL] [Window      ] Unable to find any valuable Window provider at all!

sdl2 - RuntimeError: Could not initialize OpenGL / GLES library

  File "/usr/lib/python2.7/site-packages/kivy/core/__init__.py", line 67, in core_select_lib
    cls = cls()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/window_sdl2.py", line 138, in __init__
    super(WindowSDL, self).__init__()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/__init__.py", line 722, in __init__
    self.create_window()
  File "/usr/lib/python2.7/site-packages/kivy/core/window/window_sdl2.py", line 237, in create_window
    self.fullscreen, resizable, state)

  File "kivy/core/window/_window_sdl2.pyx", line 133, in kivy.core.window._window_sdl2._WindowSDL2Storage.setup_window (kivy/core/window/_window_sdl2.c:2367)

  File "kivy/core/window/_window_sdl2.pyx", line 55, in kivy.core.window._window_sdl2._WindowSDL2Storage.die (kivy/core/window/_window_sdl2.c:1568)

[CRITICAL] [App         ] Unable to get a Window, abort.