DGI smaller encoding (#96)

* Experiment with storing DGI hit emission and probe radiance with half-float precision.

* Trying RGBM32 encoding for DGI propogation.

* Moved DGI radiance encoding functions to separate from emission to quickly iterate with it without touching the baked emission data.

* Use LogLUV encoding for DGI hit and probe radiance.

* Added YCoCg encoding for DGI radiance for testing.

* Faster and more precise LogLuv radiance encoding with lower range.

* Added a radiance encoding setting to Probe Dynamic GI volume component to switch between RGB Float and LogLuv.

* Fixed hit radiance decoding for different encodings when baking mixed lighting.

* Moved the radiance encoding setting from the volume component to frame settings.

* Dynamic GI: Added HalfLUV, and R11G11B10 encoding modes

Co-authored-by: pastasfuture <[email protected]>

Author: AndrewSaraevUnity

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/Settings/FrameSettingsUI.Drawers.cs

@@ -362,6 +362,13 @@ static void Drawer_SectionLightingSettings(SerializedFrameSettings serialized, E
                 hasMixedValues: serialized.probeVolumeDynamicGIMixedLightMode.hasMultipleDifferentValues,
                 overrideable: () => hdrpSettings.supportProbeVolume && hdrpSettings.supportProbeVolumeDynamicGI
             );
+            area.AmmendInfo(FrameSettingsField.ProbeVolumeDynamicGIRadianceEncoding,
+                overridedDefaultValue: ProbeVolumeDynamicGIRadianceEncoding.RGBFloat,
+                customGetter: () => serialized.probeVolumeDynamicGIRadianceEncoding.GetEnumValue<ProbeVolumeDynamicGIRadianceEncoding>(),
+                customSetter: v  => serialized.probeVolumeDynamicGIRadianceEncoding.SetEnumValue((ProbeVolumeDynamicGIRadianceEncoding)v),
+                hasMixedValues: serialized.probeVolumeDynamicGIRadianceEncoding.hasMultipleDifferentValues,
+                overrideable: () => hdrpSettings.supportProbeVolume && hdrpSettings.supportProbeVolumeDynamicGI
+            );
 
             area.AmmendInfo(FrameSettingsField.Volumetrics, overrideable: () => hdrpSettings.supportVolumetrics);
             area.AmmendInfo(FrameSettingsField.ReprojectionForVolumetrics, overrideable: () => hdrpSettings.supportVolumetrics);

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/Settings/SerializedFrameSettings.cs

@@ -23,6 +23,7 @@ class SerializedFrameSettings
         public SerializedProperty probeVolumeDynamicGIPropagationQuality;
         public SerializedProperty probeVolumeDynamicGIMaxSimulationsPerFrame;
         public SerializedProperty probeVolumeDynamicGIMixedLightMode;
+        public SerializedProperty probeVolumeDynamicGIRadianceEncoding;
         public SerializedProperty materialQuality;
 
         public SerializedObject serializedObject => m_RootData.serializedObject;
@@ -106,6 +107,7 @@ public SerializedFrameSettings(SerializedProperty rootData, SerializedProperty r
             probeVolumeDynamicGIPropagationQuality     = rootData.FindPropertyRelative("probeVolumeDynamicGIPropagationQuality");
             probeVolumeDynamicGIMaxSimulationsPerFrame = rootData.FindPropertyRelative("probeVolumeDynamicGIMaxSimulationsPerFrame");
             probeVolumeDynamicGIMixedLightMode         = rootData.FindPropertyRelative("probeVolumeDynamicGIMixedLightMode");
+            probeVolumeDynamicGIRadianceEncoding       = rootData.FindPropertyRelative("probeVolumeDynamicGIRadianceEncoding");
             materialQuality                            = rootData.Find((FrameSettings s) => s.materialQuality);
         }
 

com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagation.hlsl

@@ -7,8 +7,8 @@
 
 int _ProbeVolumeProbeCount;
 
-RWStructuredBuffer<float3> _RadianceCacheAxis;
-StructuredBuffer<float3> _PreviousRadianceCacheAxis;
+RWStructuredBuffer<RADIANCE> _RadianceCacheAxis;
+StructuredBuffer<RADIANCE> _PreviousRadianceCacheAxis;
 
 int _ProbeVolumeIndex;
 float _LeakMitigation;
@@ -23,7 +23,7 @@ bool IsFarFromCamera(float3 worldPosition, float rangeInFrontOfCamera, float ran
 float3 ReadPreviousPropagationAxis(uint probeIndex, uint axisIndex)
 {
     const uint index = axisIndex * _ProbeVolumeProbeCount + probeIndex;
-    return _PreviousRadianceCacheAxis[index];
+    return DecodeRadiance(_PreviousRadianceCacheAxis[index]);
 }
 
 float InvalidScale(float probeValidity)

com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationAxes.compute

@@ -1,14 +1,14 @@
-#pragma multi_compile _ SAMPLE_NEIGHBORS_DIRECTION_ONLY SAMPLE_NEIGHBORS_POSITION_AND_DIRECTION
-#pragma multi_compile _ PROPAGATION_AXIS_MOST PROPAGATION_AXIS_LEAST
-#pragma multi_compile _ PREVIOUS_RADIANCE_CACHE_INVALID
-
 #pragma kernel PropagateLight
 #define GROUP_SIZE 64
 // #pragma enable_d3d11_debug_symbols
 
+#pragma multi_compile _ SAMPLE_NEIGHBORS_DIRECTION_ONLY SAMPLE_NEIGHBORS_POSITION_AND_DIRECTION
+#pragma multi_compile _ PROPAGATION_AXIS_MOST PROPAGATION_AXIS_LEAST
+#pragma multi_compile _ PREVIOUS_RADIANCE_CACHE_INVALID
+
 #pragma multi_compile BASIS_SPHERICAL_GAUSSIAN BASIS_SPHERICAL_GAUSSIAN_WINDOWED BASIS_AMBIENT_DICE_SHARP BASIS_AMBIENT_DICE_SOFTER BASIS_AMBIENT_DICE_SUPER_SOFT BASIS_AMBIENT_DICE_ULTRA_SOFT
 #pragma multi_compile BASIS_PROPAGATION_OVERRIDE_NONE BASIS_PROPAGATION_OVERRIDE_SPHERICAL_GAUSSIAN BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SOFTER BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SUPER_SOFT BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_ULTRA_SOFT
-
+#pragma multi_compile _ RADIANCE_ENCODING_LOGLUV RADIANCE_ENCODING_HALFLUV RADIANCE_ENCODING_R11G11B10
 
 #include "Packages/com.unity.render-pipelines.high-definition-config/Runtime/ShaderConfig.cs.hlsl"
 #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
@@ -42,7 +42,7 @@ StructuredBuffer<NeighborAxisLookup> _SortedNeighborAxisLookups;
 StructuredBuffer<NeighborAxis> _ProbeVolumeNeighbors;
 int _ProbeVolumeNeighborsCount;
 
-StructuredBuffer<float3> _HitRadianceCacheAxis;
+StructuredBuffer<RADIANCE> _HitRadianceCacheAxis;
 int _HitRadianceCacheAxisCount;
 
 float _PropagationContribution;
@@ -239,7 +239,7 @@ void PropagateLight(uint3 id : SV_DispatchThreadID)
         if (IsFarFromCamera(probePositionWS, _RangeInFrontOfCamera, _RangeBehindCamera))
         {
             #if defined(PREVIOUS_RADIANCE_CACHE_INVALID)
-            _RadianceCacheAxis[index] = 0;
+            _RadianceCacheAxis[index] = ZeroRadiance();
             #else
             _RadianceCacheAxis[index] = _PreviousRadianceCacheAxis[index];
             #endif
@@ -287,7 +287,7 @@ void PropagateLight(uint3 id : SV_DispatchThreadID)
             {
                 // Hit
                 float weight = neighborAxisLookup.hitWeight * basisAxisNeighborHitIntegral;
-                incomingHitRadiance += _HitRadianceCacheAxis[hitIndex] * weight;
+                incomingHitRadiance += DecodeRadiance(_HitRadianceCacheAxis[hitIndex]) * weight;
             }
             else
             {
@@ -336,6 +336,6 @@ void PropagateLight(uint3 id : SV_DispatchThreadID)
             }
         }
 
-        _RadianceCacheAxis[index] = (incomingHitRadiance + incomingMissRadiance) * _PropagationContribution;
+        _RadianceCacheAxis[index] = EncodeRadiance((incomingHitRadiance + incomingMissRadiance) * _PropagationContribution);
     }
 }

com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationClearRadianceCache.compute

@@ -2,10 +2,13 @@
 #define GROUP_SIZE 64
 //#pragma enable_d3d11_debug_symbols
 
+#pragma multi_compile _ RADIANCE_ENCODING_LOGLUV RADIANCE_ENCODING_HALFLUV RADIANCE_ENCODING_R11G11B10
 
-RWStructuredBuffer<float3> _RadianceCacheAxis0;
-RWStructuredBuffer<float3> _RadianceCacheAxis1;
-RWStructuredBuffer<float3> _HitRadianceCacheAxis;
+#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbeVolumeDynamicGI.hlsl"
+
+RWStructuredBuffer<RADIANCE> _RadianceCacheAxis0;
+RWStructuredBuffer<RADIANCE> _RadianceCacheAxis1;
+RWStructuredBuffer<RADIANCE> _HitRadianceCacheAxis;
 int _RadianceCacheAxisCount;
 int _HitRadianceCacheAxisCount;
 
@@ -15,11 +18,11 @@ void ClearPreviousRadianceCache(uint3 id : SV_DispatchThreadID)
     const int axisIndex = id.x;
     if (axisIndex < _RadianceCacheAxisCount)
     {
-        _RadianceCacheAxis0[axisIndex] = 0;
-        _RadianceCacheAxis1[axisIndex] = 0;
+        _RadianceCacheAxis0[axisIndex] = ZeroRadiance();
+        _RadianceCacheAxis1[axisIndex] = ZeroRadiance();
     }
     if (axisIndex < _HitRadianceCacheAxisCount)
     {
-        _HitRadianceCacheAxis[axisIndex] = 0;
+        _HitRadianceCacheAxis[axisIndex] = ZeroRadiance();
     }
 }

com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationCombine.compute

@@ -1,3 +1,12 @@
+#pragma kernel CombinePropagationAxis
+#define GROUP_SIZE 64
+//#pragma enable_d3d11_debug_symbols
+
+#pragma multi_compile BASIS_SPHERICAL_GAUSSIAN BASIS_SPHERICAL_GAUSSIAN_WINDOWED BASIS_AMBIENT_DICE_SHARP BASIS_AMBIENT_DICE_SOFTER BASIS_AMBIENT_DICE_SUPER_SOFT BASIS_AMBIENT_DICE_ULTRA_SOFT
+#pragma multi_compile BASIS_PROPAGATION_OVERRIDE_NONE BASIS_PROPAGATION_OVERRIDE_SPHERICAL_GAUSSIAN BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SOFTER BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SUPER_SOFT BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_ULTRA_SOFT
+#pragma multi_compile _ RADIANCE_ENCODING_LOGLUV RADIANCE_ENCODING_HALFLUV RADIANCE_ENCODING_R11G11B10
+
+#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbeVolumeDynamicGI.hlsl"
 #include "Packages/com.unity.render-pipelines.high-definition-config/Runtime/ShaderConfig.cs.hlsl"
 #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/EntityLighting.hlsl"
 #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/CommonLighting.hlsl"
@@ -6,15 +15,6 @@
 #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbeVolumeSphericalHarmonicsLighting.hlsl"
 #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationBasis.hlsl"
 
-#pragma kernel CombinePropagationAxis
-
-#pragma multi_compile BASIS_SPHERICAL_GAUSSIAN BASIS_SPHERICAL_GAUSSIAN_WINDOWED BASIS_AMBIENT_DICE_SHARP BASIS_AMBIENT_DICE_SOFTER BASIS_AMBIENT_DICE_SUPER_SOFT BASIS_AMBIENT_DICE_ULTRA_SOFT
-#pragma multi_compile BASIS_PROPAGATION_OVERRIDE_NONE BASIS_PROPAGATION_OVERRIDE_SPHERICAL_GAUSSIAN BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SOFTER BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SUPER_SOFT BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_ULTRA_SOFT
-
-#define GROUP_SIZE 64
-//#pragma enable_d3d11_debug_symbols
-
-
 StructuredBuffer<float> _ProbeVolumeAtlasReadSHL01Buffer;
 StructuredBuffer<float> _ProbeVolumeAtlasReadSHL2Buffer;
 StructuredBuffer<float> _ProbeVolumeAtlasReadValidityBuffer;
@@ -31,7 +31,7 @@ float3 _ProbeVolumeAtlasSHRotateForward;
 float3 _ProbeVolumeDGIBoundsRight;
 float3 _ProbeVolumeDGIBoundsUp;
 
-StructuredBuffer<float3> _RadianceCacheAxis;
+StructuredBuffer<RADIANCE> _RadianceCacheAxis;
 int _RadianceCacheAxisCount;
 float _BakedLightingContribution;
 float _DynamicPropagationContribution;
@@ -142,7 +142,7 @@ SHIncomingIrradiance ProjectPropagationAxisFromFit(uint probeIndex)
     uint localIndex = probeIndex;
     for (int axis = 0; axis < NEIGHBOR_AXIS_COUNT; ++axis)
     {
-        float3 radiance = _RadianceCacheAxis[localIndex].xyz;
+        float3 radiance = DecodeRadiance(_RadianceCacheAxis[localIndex]);
         float3 directionOS = _RayAxis[axis].xyz;
         const float3x3 probeVolumeLtw = float3x3(_ProbeVolumeDGIBoundsRight, _ProbeVolumeDGIBoundsUp, cross(_ProbeVolumeDGIBoundsRight, _ProbeVolumeDGIBoundsUp));
         float3 directionWS = mul(directionOS, probeVolumeLtw);

com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationHits.compute

@@ -1,12 +1,13 @@
-#pragma multi_compile _ COMPUTE_INFINITE_BOUNCE
-#pragma multi_compile _ PREVIOUS_RADIANCE_CACHE_INVALID
-
 #pragma kernel AccumulateLightingDirectional
 #define GROUP_SIZE 64
 //#pragma enable_d3d11_debug_symbols
 
+#pragma multi_compile _ COMPUTE_INFINITE_BOUNCE
+#pragma multi_compile _ PREVIOUS_RADIANCE_CACHE_INVALID
+
 #pragma multi_compile BASIS_SPHERICAL_GAUSSIAN BASIS_SPHERICAL_GAUSSIAN_WINDOWED BASIS_AMBIENT_DICE_SHARP BASIS_AMBIENT_DICE_SOFTER BASIS_AMBIENT_DICE_SUPER_SOFT BASIS_AMBIENT_DICE_ULTRA_SOFT
 #pragma multi_compile BASIS_PROPAGATION_OVERRIDE_NONE BASIS_PROPAGATION_OVERRIDE_SPHERICAL_GAUSSIAN BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SOFTER BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_SUPER_SOFT BASIS_PROPAGATION_OVERRIDE_AMBIENT_DICE_WRAPPED_ULTRA_SOFT
+#pragma multi_compile _ RADIANCE_ENCODING_LOGLUV RADIANCE_ENCODING_HALFLUV RADIANCE_ENCODING_R11G11B10
 
 #define SHADOW_MINIMAL
 #define LIGHT_EVALUATION_NO_HEIGHT_FOG
@@ -21,7 +22,7 @@
 #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationLighting.hlsl"
 #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/ProbeVolume/DynamicGI/ProbePropagationBasis.hlsl"
 
-RWStructuredBuffer<float3> _HitRadianceCacheAxis;
+RWStructuredBuffer<RADIANCE> _HitRadianceCacheAxis;
 int _HitRadianceCacheAxisCount;
 
 StructuredBuffer<PackedNeighborHit> _ProbeVolumeNeighborHits;
@@ -223,6 +224,6 @@ void AccumulateLightingDirectional(uint3 id : SV_DispatchThreadID)
         lighting += UnpackEmission(neighborData.emission) * _BakedEmissionMultiplier;
         lighting += UnpackEmission(neighborData.mixedLighting) * _MixedLightingMultiplier;
 
-        _HitRadianceCacheAxis[hitAxisIndex] = lighting;
+        _HitRadianceCacheAxis[hitAxisIndex] = EncodeRadiance(lighting);
     }
 }