[Discuss-gnuradio] GNU radio/multimode.py: OpenGL " no valid context" problems under Mac OS X 10.7.4

[daniel . e . weeks]

Trying to get gnuradio to work on 10.7.4 Air with an ezcap USB 2.0 DVB-T/DAB/FM 
dongle.  Installed gnuradio using the titanous / homebrew-gnuradio approach.


Using gnuradio with qt-gui with a simple grc configuration, I can hear some 
(less than perfect) FM audio and can see the various graphs dynamically in real 
time.  This argues that gnuradio and supporting software are installed 
relatively correctly, and that the rtlsdr dongle can be recognized.


But if I try to use multimode.py (which uses wxGui items), after installing 
installing PyOpenGL-3.0.2b2, it dies with the error message

"OpenGL.error.Error: Attempt to retrieve context when no valid context"


More detail pasted in below.  I am mystified re how to solve this.


Has anyone gotten multimode.py to work properly, with the graphical displays, 
on a 10.7.4 Mac OS X machine?

Thank you,
Dan

% multimode.py
Mac OS; Clang version 3.1 (tags/Apple/clang-318.0.61); Boost_105000; 
UHD_003.004.003-177-g584b7ae2

Using Volk machine: sse4_1_64_orc
gr-osmosdr supported device types: file fcd rtl rtl_tcp uhd 
Using device #0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Elonics E4000 tuner
Exact sample rate is: 1000000.026491 Hz
>>> gr_fir_ccc: using SSE
>>> gr_fir_fff: using SSE
Traceback (most recent call last):
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/plotter/plotter_base.py",
 line 187, in _on_paint
    for fcn in self._draw_fcns: fcn[1]()
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/plotter/plotter_base.py",
 line 59, in draw
    self._draw()
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/plotter/grid_plotter_base.py",
 line 260, in _draw_grid
    (scaled_tick, self.height-self.padding_bottom),
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/plotter/grid_plotter_base.py",
 line 368, in _draw_grid_line
    GL.glVertexPointerf(points)
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyOpenGL-3.0.2b2-py2.7.egg/OpenGL/latebind.py",
 line 45, in __call__
    return self._finalCall( *args, **named )
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyOpenGL-3.0.2b2-py2.7.egg/OpenGL/wrapper.py",
 line 533, in wrapperCall
    cArgs,
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyOpenGL-3.0.2b2-py2.7.egg/OpenGL/arrays/arrayhelpers.py",
 line 154, in __call__
    contextdata.setValue( self.constant, pyArgs[self.pointerIndex] )
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyOpenGL-3.0.2b2-py2.7.egg/OpenGL/contextdata.py",
 line 57, in setValue
    context = getContext( context )
  File 
"/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyOpenGL-3.0.2b2-py2.7.egg/OpenGL/contextdata.py",
 line 40, in getContext
    """Attempt to retrieve context when no valid context"""
OpenGL.error.Error: Attempt to retrieve context when no valid context

% gnuradio-config-info -v
3.6.1

% cat ~/.gnuradio/config.conf 
[grc]
local_blocks_path=/usr/local/share/gnuradio/grc/blocks


Run into the same error above if I change config.conf to this:


% cat ~/.gnuradio/config.conf
[grc]
local_blocks_path=/usr/local/share/gnuradio/grc/blocks
[wxgui]
style=gl
fft_rate=30
waterfall_rate=30
scope_rate=30
number_rate=5
const_rate=5
const_size=2048