[Feature] Validation for virtual resources

[QDanteQ]

Hi, I'm wondering if you have plans on adding a validation to GPU Reshape for virtual (in d3d12 Reserved) resources. Basically to check if the region is mapped or not, when accessing it in shader.

And thank you for this tool, it's very cool.

[miguel-petersen]

Hi! Apologies on the delay, for some reason I didn't get a notification.

It's definitely on the roadmap, but not fully sure of the priority just yet. Though, you're not the first to ask for it so there seems to be some interest for it.

For initialization validation I effectively create a "shadow" memory for the buffer/textures, one big giant buffer that specifies if texels and bytes have been written to. Challenge is, drivers are very... tricky with indexing buffers larger than 4gb (some used to just return zero!), even if reserved. I ran into a lot of issues, hence why I decided to not include reserved resources just yet since they'd blow it up.

I think what I can do is have an indirection buffer per page into this shadow buffer, which is effectively what software virtual resources do (manual page table + backing physical). It's a fair bit of work, but doable.

I need to wrap up raytracing support and some work around ExecuteIndirect validation before, but it's not super far off. I'll keep this thread updated on the matter. 🙂