Render inside python threads

C++ coding using Panda3D
2

You’ve forgotten to set all of the argument and return types, so your pointer values are getting truncated to 32-bit integers:

    liblr.RenderFunc.restype = ctypes.c_void_p
    liblr.RenderFunc.argtypes = [ctypes.c_void_p]
    liblr.Render.restype = ctypes.c_void_p
    liblr.Render.argtypes = [ctypes.c_void_p]

Without this change, it only works if the pointer values just so happen to have all-zeroes in the higher 32 bits.

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