Test plotting directly from GPU using OpenGL
@helluy, PyOpenCL has interoperability with OpenGL if compiled with OpenGL support : https://documen.tician.de/pyopencl/runtime_gl.html#pyopencl.have_gl
@helluy, PyOpenCL has interoperability with OpenGL if compiled with OpenGL support : https://documen.tician.de/pyopencl/runtime_gl.html#pyopencl.have_gl