[PyOpenGL-Users] using glGetSynciv

[Henry G. <he...@ca...>]

I'm trying to query the status of a fence I've created using
glFenceSync, using the following snippet:

my_sync = GL_sync.glFenceSync(GL_sync.GL_SYNC_GPU_COMMANDS_COMPLETE, 0)
        
a = numpy.zeros(10, dtype='uint32')
foo = GL_sync.glGetSynciv(my_sync,
                GL_sync.GL_SYNC_STATUS,
                10, None, a)

Running it returns the following error that I am having trouble parsing:

ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>:
("byref() argument must be a ctypes instance, not 'int'", ' If you have
ERROR_ON_COPY enabled, remember to pass in an array to array-requiring
functions.')

The trouble is that I'm not sure to which argument it is referring. I am
not sufficiently familiar with the PyOpenGL interface.

Any assistance would be much appreciated.

Thanks,

Henry Gomersall