Aras PranckevičiusAug 30, 2023

You'd think there's a million ready-to-use "sort some things, on the GPU" codes out there, but outside of CUDA there isn't all that much. The ones that work, that is.

So I spent way too much time debugging sorting of a bunch of points! As a side effect though, Unity HDRP GPU sorting utility got a fix pull request :) https://github.com/Unity-Technologies/Graphics/pull/7954

Improve robustness of GPUSort wrt out of bounds buffer reads/writes by aras-p · Pull Request #7954 · Unity-Technologies/Graphics

Purpose of this PR GPUSort utility (which seems to be used for the "software" Line Rendering system in HDRP) in some cases produces incorrect results, at least on Metal (most notably, when the size...

GitHub
Show threadMatt PettineoAug 31, 2023
@aras you may have seen this already, but AMD has a ParallelSort library: https://gpuopen.com/fidelityfx-parallel-sort/
AMD FidelityFX Parallel Sort

AMD FidelityFX Parallel Sort makes sorting data on the GPU quicker, and easier. Use our SM6.0 compute shaders to get your data in order.

AMD GPUOpen
Show threadAras Pranckevičius
@mjp I have not, actually! And googling for various GPU sorting keywords did not, ahem, sort the result of this towards the top. Will look, thanks!
Aug 31, 2023 at 3:20amWeb