christopher fiala 7eb6499350 Improve VRS debug functionality in a variety of ways: ...

- Debug overlay no longer disappears when no generator is enabled, instead displaying all red (1x1 rate)
- Debug overlay now correctly displays conservative CAS rate when `r.VRS.ContrastAdaptiveShadingRate.PreviewType` is set to 2, and unreprojected rate when set to 3
- Force rate image generation now resides in the manager, and overrides alternative image generation
- Force rate now supports coarse shading rates (2x4, 4x2, 4x4)
- Force rate rates are now indexed as 0 through 6 rather than using the shading rate actual bit mask
- Force rate console command renamed from `r.VRS.ContrastAdaptiveShading.Debug.ForceRate` to `r.VRS.DebugForceRate`
- Removed unneeded force rate functionality from the CAS VRSShadingRateCalculate.usf shader
- Fixed off-by-one error in SRI texture size calculation and moved all calculation into one helper function in the manager

#jira UE-178033, UE-177271
#rb robert.srinivasiah
#preflight 6435cccc00398d6f88f5b45a

[CL 24999047 by christopher fiala in ue5-main branch]

2023-04-11 17:30:52 -04:00

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VRSShadingRateCalculate.usf

Improve VRS debug functionality in a variety of ways:

2023-04-11 17:30:52 -04:00

VRSShadingRateCombine.usf

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VRSShadingRateCommon.ush

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VRSShadingRateFoveated.usf

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VRSShadingRatePreview.usf

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VRSShadingRateReproject.usf

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