I’ve now implemented an all-GPU-compute pipeline in a Pathfinder branch, avoiding the rasterizer entirely (CPU still used for tiling). However, so far it seems that using compute shader to create vector tiles and the standard GPU rasterizer to composite them is fastest…
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This makes sense to me: hard to beat the HW rasterizer for blending. But what’s strange is that I’ve seen numbers that show compute being 40x faster than what I’m seeing on comparable hardware, and I can’t reproduce them…
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Replying to @pcwalton
What GPU/vendor are you running on? This is the sort of thing that I'd expect to vary wildly on different archs. I think it's worth a test on other vendors hardware. Also possible you are hitting a driver special-case for the HW ver. Could be worth working on compute more.
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Replying to @ScatteredRay
My MacBook Pro’s Radeon Pro 560 and Intel HD 630.
11:23 AM - 7 May 2020
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