If and when there will be accelerated drivers in the gpus, they will directly use accelerated openGL library, or if there will never be and there will be only accelerated vulkan, like the X512 drivers for ATI, then zink is used, is the shortest way … and at the moment probably the only way to have openGL accelerated via gpu … the second option is lavapipe which are vulkan accelerated via CPU, which with CPU with many cores you have decent performance, and consequently also decent openGL
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