Integrate virutal texture allocator improvements from main.
[FYI] ben.ingram
#lockdown kevin.ortegren
#ROBOMERGE-SOURCE: CL 15922154 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v786-15839533)
[CL 15922638 by jeremy moore in ue5-main branch]
- Account for VT requests now encoding vLevel+1
- Fix sampling in shader when explicit mip level is not given
#rb none
#jira none
[CL 15905062 by Ben Ingram in ue5-main branch]
- Now try to map both wrapped/unwrapped address when processing a wrapped address
- Previously there was nothing to map tiles to the original vAddress
#rb none
#jira FROST-1581
[CL 15857083 by Ben Ingram in ue5-main branch]
- Check partially allocated block for fit, don't need to start with a completely free block for allocations
- Try to use the lowest possible vAddress for new allocations, this reduces the texture area covered by allocations
- Page table is no longer required to be square power-2 texture, instead allow it to grow organically as allocated area increases
- Allocator starts with maximum-sized block and tracks allocated area, no longer needs special logic to 'grow'
- Rectangular allocated VTs now mip based on min-size rather than max-size, relaxes alignment requirements and allows better packing
#rb jeremy.moore
#jira none
[CL 15825578 by Ben Ingram in ue5-main branch]
- Rework hashing of FAllocatedVTDescription to be more explicit about hashing each individual member, don't hash the debug name
#rb none
#jira none
[CL 15732300 by Ben Ingram in ue5-main branch]
Ensure that we mask off unwanted bits in the UDIM wrapped address.
Fixes bugs in VT mapping.
#rb ben.ingram
[CL 15728315 by Jeremy Moore in ue5-main branch]
Previously for streaming pages, the request would return pending, but because the page is mapped, no subsequent request would occur.
#rb none
[CL 14738087 by Jeremy Moore in ue5-main branch]
Always test if page is mapped instead of assuming it isn't in one case.
This is a placeholder solution for a VT mapping crash while I investigate how the logic is failing here.
#rb none
[CL 14700400 by Jeremy Moore in ue5-main branch]
- Need to make sure wrapped vAddress is properly used in all cases, otherwise can end up with duplicate/inconsistent page mappings
#rb none
#jira UESP-4030, UESP-4017
[CL 14580045 by Ben Ingram in ue5-main branch]
