Im not sure I’ve ever seen InterlockedAdd (hlsl) work correctly on Nvidia. Works on AMD tho. Can’t help but wonder if I’m doing something wrong, and AMD is more permissive. Seen a few reports of other people noticing the same thing.
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It'd be unusual to need a memory barrier if you're using atomics on UAVs. But if you're trying to read straight back out of someBuffer that could be iffy. Are you sure you didn't want to use the 3 operand version of InterlockedAdd with the 'old' return value?
I use the 3 operand version (and store the result in another buffer). Twitter just didn't give me enough space to write it all out.
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Wait you need to post something that reproduces the actual problem you're seeing or else this is pointless. Use http://gist.github.com or some other pastebin maybe? :)
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Yeah I need to create a small test case outside of our massive codebase. I've known I needed to do this, but haven't had the time to commit to it. I'll see if I can carve out some time to do that and then let you know.
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