Run a compute job that packs most commonly used instance data (LocalToWorld matrix and some other bits - 80 bytes) into per-instance vertex buffer. Vertex shader does not have access to GPUScene and instead loads instance data from a per-instance vertex buffer. If it needs more primitive/instance data than available then it will load it from Primitive UB, binding unique uniform buffer and breaking auto-instancing. Pixel shader has a full access to a GPUScene
There are 3 ways how FSceneDataIntermediates gets populated
1. PrimitiveId + GPUScene (Desktop)
2. Per-Instance data + Primitive UB (Mobile)
3. Primitive UB (auto-instancing disabled)
Details for GPUScene specific vertex inputs and access to FSceneDataIntermediates are hidden behind a macro:
VF_GPUSCENE_DECLARE_INPUT_BLOCK
VF_GPUSCENE_GET_INTERMEDIATES
FSceneDataIntermediates is now stored in FVertexFactoryIntermediates, FMaterialVertexParameters. Added a few GetPrimitiveData() overloads that allows you to access PrimitiveData depending on current context. Removed most of the cases where GetPrimitiveData() gets used with PrimitiveId.
#rb Ola.Ollson
#ROBOMERGE-SOURCE: CL 17093848 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v853-17066230)
[CL 17093856 by dmitriy dyomin in ue5-release-engine-test branch]
-- check for existence of PerBoneHitProxy before accessing it
#jira UE-112900
#rb none
#ROBOMERGE-SOURCE: CL 16778237 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v836-16769935)
[CL 16778242 by brett miller in ue5-release-engine-test branch]
- Added instance data validation
- Added general load balancer for instance processing on GPU (will move to own files later)
- Added initial GPU-side write access API for GPU scene.
- Addded specialized kernel to update primitive IDs in instances when that is the only change.
#rb graham.wihlidal
#jira UE-116671
#preflight 60c25d7b1264df0001aab80b
#ROBOMERGE-SOURCE: CL 16628528 via CL 16628539
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v831-16623017)
[CL 16628550 by ola olsson in ue5-release-engine-test branch]
* Moved Nanite resource ID and hierarchy offset back to primitive data (indirection cost is largely noise these days, and memory savings is more important - GetInstanceData() fetches this data and stores in the pre-existing registers so all the callsites don't have to worry about it).
* Removed FNaniteInfo from FPrimitiveInfo (and the type itself) in favor of just having a 32bit per-instance hierarchy root offset. Hierarchy offset and runtime resource ID just sourced from primitive.
* Removed PrimitiveID from CPU instance data (GPU still needs it). This value was redundantly stored per-instance, and now the GPU Scene upload just blits it over from primitive when the instance data is uploaded.
* Added new virtual GetNaniteResourceInfo on FPrimitiveSceneProxy that retrieves the Nanite resource ID and hierarchy offset stored on a given primitive (needed now that FPrimitiveInstance doesn't cache a copy). The non-virtual FPrimitiveSceneProxy::IsNaniteMesh() helper is used to avoid this virtual function call for non-Nanite proxies.
* Removed deprecated and no longer referenced Nanite::FResources array on FNaniteGeometryCollectionSceneProxy
* Removed expensive per-instance checks() in a few spots
* Stubbed out upcoming per instance payload allocator offset
* Removed deprecated and never referenced non-GPUScene GetInstanceData uniform buffer path
* Significantly cleaned up and optimized a lot of ISM instance data retrieval, including avoiding unnecessary FRenderTransform <-> FMatrix conversions.
* Removed GetInstanceShaderValues API, it was inefficient and annoying to require retrieval of all parameters when often only one or two of them were ever used. In some cases even the origin was unused but .w was needed because of the per-instance random packing.
* Implemented explicit GetInstanceRandomID() accessor to fetch (under current packing) Origin.W without exposing this to the callsites
* Implemented public API for GetInstanceLightMapData(), since the internal version was only accessible by GetInstanceShaderValues()
* Renamed GetInstanceShaderCustomDataValues() -> GetInstanceCustomDataValues() for API consistency
#rb jason.nadro, krzysztof.narkowicz
[FYI] rune.stubbe, brian.karis
#ROBOMERGE-OWNER: graham.wihlidal
#ROBOMERGE-AUTHOR: graham.wihlidal
#ROBOMERGE-SOURCE: CL 16583156
#ROBOMERGE-BOT: (v828-16531559)
#ROBOMERGE-CONFLICT from-shelf
[CL 16583193 by graham wihlidal in ue5-main branch]
This change is another basis for more instance data and GPUScene improvements coming down the pipe.
#rb jason.nadro, krzysztof.narkowicz, zach.bethel, zak.middleton, rune.stubbe, ben.woodhouse
[FYI] brian.karis, ola.olsson
#preflight 60b9608d0249c300016598de
#ROBOMERGE-OWNER: graham.wihlidal
#ROBOMERGE-AUTHOR: graham.wihlidal
#ROBOMERGE-SOURCE: CL 16555619
#ROBOMERGE-BOT: (v828-16531559)
#ROBOMERGE-CONFLICT from-shelf
[CL 16555914 by graham wihlidal in ue5-main branch]
-- Support for Nanite to GeometryCollection conversion
-- Support for multiple UV sets
#jira UE-114992
#rb jimmy.andrews
[FYI] brice.criswell
#ROBOMERGE-OWNER: peter.knepley
#ROBOMERGE-AUTHOR: brett.miller
#ROBOMERGE-SOURCE: CL 16363667 in //UE5/Private-Frosty/...
#ROBOMERGE-BOT: STARSHIP (Private-Frosty -> Main) (v804-16311228)
#ROBOMERGE-CONFLICT from-shelf
[CL 16370251 by peter knepley in ue5-main branch]
- Require 64bit atomic support for Nanite by default now (r.Nanite.RequireAtomic64Support=1)
- Cleaned up a bunch of cvar component reattach callbacks to use lambdas instead of redundant global functions
- Added UStaticMesh::HasValidNaniteData() as a helper to check if an asset has valid Nanite data
- Improved Nanite unsupported on screen error message so that we don't asks the user to update GPU drivers on a console :)
#rb nick.whiting
#jira UETOP-1646
[FYI] brian.karis, michal.valient
#ROBOMERGE-OWNER: graham.wihlidal
#ROBOMERGE-AUTHOR: graham.wihlidal
#ROBOMERGE-SOURCE: CL 16363554 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v804-16311228)
#ROBOMERGE-CONFLICT from-shelf
[CL 16363648 by graham wihlidal in ue5-main branch]
- change matrix types for dynamic data to be explicitly using float
- wrapped update of vertex buffer to ensure type check
- When LWC mode is on, convert double based matrices to they float equivalent ( sub-optimal, but necessary for now until we have a better way )
#jira UE-115570
#fyi brice.criswell, brett.miller
[CL 16333456 by cedric caillaud in ue5-main branch]
-- OnMotionEnd now resets instance transforms as well as component transforms.
#jira UETOP-1546
#rb brice.criswell
#lockdown nick.whiting
#ROBOMERGE-SOURCE: CL 16198557 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v796-16191650)
[CL 16198575 by brett miller in ue5-main branch]
-- Added state machine logic and scene proxy callbacks for triggering when motion begins and ends.
#jira UETOP-1546
#rb graham.wihlidal
#lockdown nick.whiting
#ROBOMERGE-SOURCE: CL 16178376 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v792-16166999)
[CL 16178381 by brett miller in ue5-main branch]
