The hardware (including the GPU) is virtualised. So the Linux video drivers can’t access the GPU directly as in a standard Linux installation; they have to use the virtual GPU provided by WSL, and I don’t think that supports OpenGL at present. In which case, you’re limited to the llvmpipe driver, which uses the CPU for rendering. There is some work being done on providing OpenGL support atop DirectX for WSL, but I believe that’s still work in progress.
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