New GPU line rasterizer using instancing GPU feature #169
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…eded anymore for plotting lines, but still used for plotting filled paths
…quator and Galactic frame with cylindrical projection are not handled. This targets issue #170
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This could enhance the performance of lines rendering because no triangulation is done (line width is handled by the GPU). This should reduce the buffer size given to the GPU as well.
This is draft PR (to be tested if performance are better).
I link the issue #168