Clean up VSM HZB by moving to previous frame data and removing redundantly exported previous frame page table.
For view contexts with VSM caching "show flag" disabled, also disable HZB so we aren't leaking HZB references out of these graphs either.
#rb graham.wihlidal
[FYI] brian.karis
#ROBOMERGE-OWNER: andrew.lauritzen
#ROBOMERGE-AUTHOR: andrew.lauritzen
#ROBOMERGE-SOURCE: CL 15826082 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v785-15821902)
#ROBOMERGE-CONFLICT from-shelf
[CL 15833868 by andrew lauritzen in ue5-main branch]
Refactoring to clean up some cross-frame resource references and enable more explicit allocations if needed
Allow nanite to take an external depth buffer to write to instead of creating one internally.
#rb ola.olsson
#ROBOMERGE-OWNER: andrew.lauritzen
#ROBOMERGE-AUTHOR: andrew.lauritzen
#ROBOMERGE-SOURCE: CL 15781280 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v783-15756269)
#ROBOMERGE-CONFLICT from-shelf
[CL 15789787 by andrew lauritzen in ue5-main branch]
- Adaptive ray counts for SMRT now work even with pass per light
- Removes a few divergences between the logic in the two paths
Remove debug projection stuff for now; will reimplement with a separate UAV write later
Remove temporal filtering for denoiser (it was broken and would need to be implemented slightly differently with the new path anyways)
Split cvar to allow separate denoiser toggle for directional (default on) and local (default off) lights
Enable SMRT for local lights and VSM caching by default
#rb brian.karis
#ROBOMERGE-OWNER: andrew.lauritzen
#ROBOMERGE-AUTHOR: andrew.lauritzen
#ROBOMERGE-SOURCE: CL 15707229 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v781-15675533)
#ROBOMERGE-CONFLICT from-shelf
[CL 15708180 by andrew lauritzen in ue5-main branch]
- Move VSM parameters into a single uniform buffer; required for base pass rendering.
- SRVs are initialized to dummy data until they are computed during the frame and subsequently updated before any VSM sampling.
- Make names and usage more consistent with other UB bindings in mesh passes
- Direct injection of VSM into translucent volume and fog
- Support VSM sampling in forward lighting shaders
- Enabled and bound currently for translucent forward and single pass water meshes
- Support VSM sampling in sky atmosphere and cloud rendering
- NOTE: Sky atmosphere LUT pass currently executes before BasePass and ShadowDepths so it will not sample proper data and throw a warning. Moving passes around to address this will come in a future commit.
#rb Brian.Karis, Ola.Olsson, Sebastien.Hillaire, Zachary.Bethel
#ROBOMERGE-OWNER: andrew.lauritzen
#ROBOMERGE-AUTHOR: andrew.lauritzen
#ROBOMERGE-SOURCE: CL 15649858 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v779-15635321)
#ROBOMERGE-CONFLICT from-shelf
[CL 15650486 by andrew lauritzen in ue5-main branch]
- added a path to propagate and cache whether material modifies position (WPO) to enable invalidating cached pages (touches whole mesh command pipeline).
- added pixel shader verision of page copying & clearing.
- also added flag for whether cached the mesh draw command supports primitive id (which enables checing this earlier).
#rb andrew.lauritzen,brian.karis,graham.wihlidal,Krzysztof.Narkowicz
#ROBOMERGE-SOURCE: CL 15436539 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v771-15082668)
[CL 15441336 by ola olsson in ue5-main branch]
- Disabled by defaul to start. Enable with r.Shadow.v.SMRT.RayCountDirectional 1
- Denoiser will now use temporal reprojection when SMRT is enabled (disable with r.Shadow.v.Denoiser.Temporal 0)
- Variety of fixes and refactors to existing VSM and projection code
- Still a few edge cases that will be improved in future around screen space trace and similar, but working fairly robustly for reasonable light source size settings
#rb ola.olsson
#fyi brian.karis
[CL 14942586 by andrew lauritzen in ue5-main branch]
- Added step after dynamic primitives are gathered to allocate a range in GPU scene for the dynamic primitives.
- Moved more GPU-Scene functionality to member functions to clean up references to internal data
- Removed the PrimitiveShaderDataBuffer/Texture from FSceneViewState
- Removed OneFramePrimitiveShaderDataBuffer/Texture from FViewInfo
- Encapsulated the collection of dynamic primitive data for upload to avoid uploading twice and prepare for parallel upload.
#rb Krzysztof.Narkowicz,graham.wihlidal
[CL 14785776 by Ola Olsson in ue5-main branch]
- Changed (most) intermediate buffers & textures in FVirtualShadowMapArray to RDG buffers/textures
- Removed GenerateIdentityPageTables as it was no longer working.
- Renamed GeneratePageFlagsFromLightGrid -> BuildPageAllocations to better reflect current function.
#rnx
#rb Andrew.Lauritzen
[CL 14693244 by Ola Olsson in ue5-main branch]
- Added LastUpdateSceneFrameNumber to Instance data
- Added GetGPUSceneFrameNumber() to access View.FrameNumber or GPU-Scene specific GPUSceneFrameNumber
- Moved GPUScene class to GPUScene.h
- Moved logic to add/remove instance data to GPU scene to class memebers.
- Added functions in FVirtualShadowMapArrayCacheManagerto invalidate footprints of removed or moved instances before GPU scene update.
- Render to virtual shadow map now invalidates as dynamic the footprint of any cluster that had LastUpdateSceneFrameNumber == GetGPUSceneFrameNumber()
#rb rune.stubbe,andrew.lauritzen
#fyi zach.bethel
[CL 14179043 by Ola Olsson in ue5-main branch]
- Remove virtual shadow cascades path and enable clipmaps instead
- Restore full resolution dense shadow maps even when virtual shadow maps are enabled. Combine dense and virtual shadow maps in the screen space shadow mask during projection.
- Remove "copy to fallback" path for virtual shadows; to be replaced by a separate explicit fallback map or similar. This will break Reverb indirect occlusion with Nanite geometry when virtual shadow maps are on for now. For functional testing, disabling virtual shadow maps will still work.
- Fix a bug with point light shadow projection matrices
- Change VirtualShadowMapId's to "int" since we set them to INDEX_NONE (-1) in a bunch of places
[CL 14156014 by andrew lauritzen in ue5-main branch]
