krzysztof narkowicz 367923aa7b GlobalDistanceField - optimizations and refactors ...

* Decreased Global Distance Field border from full voxel to half voxel and decreased page size from 16 to 8. This removes ~30% of pages, saving memory and improving update speed
* Half texel border requires to compute gradients using 8 page table fetches, but it didn�t influence Lumen tracing performance on console
* Smaller pages put some pressure on culling and other passes. Culling grid was switch from per page to per 4x4x4 pages. Overall full GDF update speed in FortGPUTestBed decreased from 5.89ms to 4.57ms
* Switched page table format to UInt32 in order to support larger Global Distance Field resolutions
* Moved all GlobalDistanceField shaders into /DistanceField/* folder, in future we should move other distance field shaders there
* Moved GlobalDistanceField page stats from r.Lumen.Visualize.Stats in Lumen code to r.GlobalDistanceField.Debug in GlobalDistanceField code
* Fixed Lumen normal visualization when only Global Distance Field tracing is enabled

#preflight 62630427006fa20b683b405a
[FYI] Tiago.Costa, Daniel.Wright

#ROBOMERGE-AUTHOR: krzysztof.narkowicz
#ROBOMERGE-SOURCE: CL 19873116 via CL 19873429 via CL 19874251
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v940-19807014)

[CL 19878047 by krzysztof narkowicz in ue5-main branch]

2022-04-22 19:55:41 -04:00

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