Made shading change mip level into a reusable const value, and fixed mip sizes for exposure RTs.

Actually tested the output of the luminance pyramid shader now and it seems to be working.

Assets/Scripts/Fsr2Context.cs

@@ -160,7 +160,7 @@ namespace FidelityFX
             bool resetAccumulation = dispatchParams.Reset || _firstExecution;
             _firstExecution = false;
             
-            // TODO Register resources: ...
+            Fsr2Pipeline.RegisterResources(_commandBuffer, dispatchParams);
             
             SetupConstants(dispatchParams, resetAccumulation);
             
@@ -184,8 +184,6 @@ namespace FidelityFX
             _fsr2ConstantsBuffer.SetData(_fsr2ConstantsArray);
             _spdConstantsBuffer.SetData(_spdConstantsArray);
             
-            Fsr2Pipeline.RegisterResources(_commandBuffer, dispatchParams);
-            
             // Compute luminance pyramid
             _computeLuminancePyramidPipeline.ScheduleDispatch(_commandBuffer, dispatchParams, dispatchThreadGroupCount.x, dispatchThreadGroupCount.y);
 
@@ -288,7 +286,7 @@ namespace FidelityFX
                 constants.frameIndex++;
 
             // Shading change usage of the SPD mip levels
-            constants.lumaMipLevelToUse = 4;    // NOTE: this is derived from a bunch of auto-generated constant values in the FSR2 code
+            constants.lumaMipLevelToUse = Fsr2Pipeline.ShadingChangeMipLevel;
 
             float mipDiv = 2 << constants.lumaMipLevelToUse;
             constants.lumaMipDimensions.x = (int)(constants.maxRenderSize.x / mipDiv);

Assets/Scripts/Fsr2Pipeline.cs

@@ -8,6 +8,8 @@ namespace FidelityFX
 {
     internal abstract class Fsr2Pipeline: IDisposable
     {
+        internal const int ShadingChangeMipLevel = 4;   // Corresponds to FFX_FSR2_SHADING_CHANGE_MIP_LEVEL define
+        
         private readonly Fsr2Callbacks _callbacks;
         protected readonly ComputeBuffer Constants;
         
@@ -57,8 +59,8 @@ namespace FidelityFX
             commandBuffer.GetTemporaryRT(UavSpdAtomicCount, 1, 1, 0, FilterMode.Point, GraphicsFormat.R32_UInt, 1, true);
             
             // Resource FSR2_ExposureMips: FFX_RESOURCE_USAGE_UAV, FFX_SURFACE_FORMAT_R16_FLOAT, FFX_RESOURCE_FLAGS_ALIASABLE, has mipmap chain
-            commandBuffer.GetTemporaryRT(UavExposureMipLumaChange, dispatchParams.RenderSize.x >> 4, dispatchParams.RenderSize.y >> 4, 0, FilterMode.Point, GraphicsFormat.R16_SFloat, 1, true);
-            commandBuffer.GetTemporaryRT(UavExposureMip5, dispatchParams.RenderSize.x >> 5, dispatchParams.RenderSize.y >> 5, 0, FilterMode.Point, GraphicsFormat.R16_SFloat, 1, true);
+            commandBuffer.GetTemporaryRT(UavExposureMipLumaChange, dispatchParams.RenderSize.x >> (ShadingChangeMipLevel + 1), dispatchParams.RenderSize.y >> (ShadingChangeMipLevel + 1), 0, FilterMode.Point, GraphicsFormat.R16_SFloat, 1, true);
+            commandBuffer.GetTemporaryRT(UavExposureMip5, dispatchParams.RenderSize.x >> 6, dispatchParams.RenderSize.y >> 6, 0, FilterMode.Point, GraphicsFormat.R16_SFloat, 1, true);
         }
 
         public static void UnregisterResources(CommandBuffer commandBuffer)