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Shared memory usage in third pass shader in prefix sum #13

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@MarcVivas

The implementation of the third pass shader in the prefix sum struct does not work on all computers.

Even though it works on my 6800xt, it does not work on my laptop's integrated GPU i3 8th gen.

The error can be fixed by using global memory to read the block sum instead of shared memory. However, this approach is less performant.

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