More than half of the time Jeff and I record a Joy of Profiling episode, we find horrible performance problems that are going to be solved by WebRender, and that feels pretty good.
You could do hierarchical Z in software. In fact I had various experiments lying around that showed that this should be possible.
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Interesting! Is it building the hierarchy incrementally or after the base level has been rendered? My intuition is that it'd be hard to do the former without trashing the cache in the hot rasterization loop, but as always intuition is not science.
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I was thinking about a coarse-grained tiling scheme to early reject large areas. I don’t think it makes sense to try to be more fine-grained than that on CPU.
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