Implemented resources and some initialization code and structs

Runtime/FrameInterpolation/FrameInterpolation.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Runtime.InteropServices;
+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
 
 namespace FidelityFX.FrameGen
 {
@@ -7,7 +9,11 @@ namespace FidelityFX.FrameGen
     {
         public struct ContextDescription
         {
-            
+            public InitializationFlags flags;
+            public Vector2Int maxRenderSize;
+            public Vector2Int displaySize;
+            public GraphicsFormat backBufferFormat;
+            public FrameInterpolationShaders shaders;
         }
 
         // TODO: turn all of these into structs
@@ -38,7 +44,43 @@ namespace FidelityFX.FrameGen
         [Serializable, StructLayout(LayoutKind.Sequential)]
         internal struct Constants
         {
+            public Vector2Int renderSize;
+            public Vector2Int displaySize;
+
+            public Vector2 displaySizeRcp;
+            public float cameraNear;
+            public float cameraFar;
+
+            public Vector2Int upscalerTargetSize;
+            public int mode;
+            public int reset;
+
+            public Vector4 deviceToViewDepth;
+
+            public float deltaTime;
+            public int HUDLessAttachedFactor;
+            public Vector2 unused;
+
+            public Vector2 opticalFlowScale;
+            public int opticalFlowBlockSize;
+            public uint dispatchFlags;
+
+            public Vector2Int maxRenderSize;
+            public int opticalFlowHalfResMode;
+            public int numInstances;
+
+            public Vector2Int interpolationRectBase;
+            public Vector2Int interpolationRectSize;
+
+            public Vector3 debugBarColor;
+            public uint backBufferTransferFunction;
+
+            public Vector2 minMaxLuminance;
+            public float tanHalfFOV;
+            public float pad;
 
+            public Vector2 jitter;
+            public Vector2 motionVectorScale;
         }
 
         [Serializable, StructLayout(LayoutKind.Sequential)]

Runtime/FrameInterpolation/FrameInterpolationContext.cs

@@ -33,6 +33,11 @@ namespace FidelityFX.FrameGen
         
         private readonly CustomSampler _sampler = CustomSampler.Create("Frame Interpolation");
 
+        private bool _firstExecution;
+        private bool _asyncSupported;
+        private ulong _previousFrameID;
+        private ulong _dispatchCount;
+        
         public void Create(in FrameInterpolation.ContextDescription contextDescription)
         {
             _contextDescription = contextDescription;
@@ -40,12 +45,23 @@ namespace FidelityFX.FrameGen
             _frameInterpolationConstantsBuffer = CreateConstantBuffer<FrameInterpolation.Constants>();
             _spdConstantsBuffer = CreateConstantBuffer<FrameInterpolation.InpaintingPyramidConstants>();
 
+            _firstExecution = true;
+            _asyncSupported = (_contextDescription.flags & FrameInterpolation.InitializationFlags.EnableAsyncSupport) == FrameInterpolation.InitializationFlags.EnableAsyncSupport;
+
+            Constants.maxRenderSize = _contextDescription.maxRenderSize;
+            Constants.displaySize = _contextDescription.displaySize;
+            Constants.displaySizeRcp.x = 1.0f / _contextDescription.displaySize.x;
+            Constants.displaySizeRcp.y = 1.0f / _contextDescription.displaySize.y;
+            Constants.interpolationRectBase = Vector2Int.zero;
+            Constants.interpolationRectSize = _contextDescription.displaySize;
+            
+            _resources.Create(_contextDescription);
             CreatePasses();
         }
 
         private void CreatePasses()
         {
-            
+            // TODO
         }
 
         public void Destroy()

Runtime/FrameInterpolation/FrameInterpolationResources.cs

@@ -1,10 +1,115 @@
-namespace FidelityFX.FrameGen
+using System;
+using System.Runtime.InteropServices;
+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+
+namespace FidelityFX.FrameGen
 {
     internal class FrameInterpolationResources
     {
+        public RenderTexture ReconstructedDepthInterpolatedFrame;
+        public RenderTexture GameMotionVectorFieldX;
+        public RenderTexture GameMotionVectorFieldY;
+        public RenderTexture InpaintingPyramid;
+        public ComputeBuffer Counters;
+        public RenderTexture OpticalFlowMotionVectorFieldX;
+        public RenderTexture OpticalFlowMotionVectorFieldY;
+        public RenderTexture PreviousInterpolationSource;
+        public RenderTexture DisocclusionMask;
+        
+        public readonly RenderTexture[] DilatedDepth = new RenderTexture[2];
+        public readonly RenderTexture[] DilatedMotionVectors = new RenderTexture[2];
+        public readonly RenderTexture[] ReconstructedDepth = new RenderTexture[2];
+        
+        public void Create(in FrameInterpolation.ContextDescription contextDescription)
+        {
+            Vector2Int displaySize = contextDescription.displaySize;
+            Vector2Int displaySizeDiv2 = new Vector2Int(displaySize.x / 2, displaySize.y / 2);
+            Vector2Int maxRenderSize = contextDescription.maxRenderSize;
+
+            ReconstructedDepthInterpolatedFrame = CreateResource("FI_ReconstructedDepthInterpolatedFrame", maxRenderSize, GraphicsFormat.R32_UInt);
+            GameMotionVectorFieldX = CreateResource("FI_GameMotionVectorFieldX", maxRenderSize, GraphicsFormat.R32_UInt);
+            GameMotionVectorFieldY = CreateResource("FI_GameMotionVectorFieldY", maxRenderSize, GraphicsFormat.R32_UInt);
+            InpaintingPyramid = CreateResourceMips("FI_InpaintingPyramid", displaySizeDiv2, GraphicsFormat.R16G16B16A16_SFloat);
+            Counters = CreateBuffer<uint>("FI_Counters", 2);    // structured buffer containing 2 UINT values
+            OpticalFlowMotionVectorFieldX = CreateResource("FI_OpticalFlowMotionVectorFieldX", maxRenderSize, GraphicsFormat.R32_UInt);
+            OpticalFlowMotionVectorFieldY = CreateResource("FI_OpticalFlowMotionVectorFieldY", maxRenderSize, GraphicsFormat.R32_UInt);
+            PreviousInterpolationSource = CreateResource("FI_PreviousInterpolationSource", displaySize, contextDescription.backBufferFormat);
+            DisocclusionMask = CreateResource("FI_DisocclusionMask", maxRenderSize, GraphicsFormat.R8G8_UNorm);
+            
+            CreateDoubleBufferedResource(DilatedDepth, "FI_DilatedDepth_", maxRenderSize, GraphicsFormat.R32_SFloat);
+            CreateDoubleBufferedResource(DilatedMotionVectors, "FI_DilatedMVs_", maxRenderSize, GraphicsFormat.R16G16_SFloat);
+            CreateDoubleBufferedResource(ReconstructedDepth, "FI_ReconstructedDepth_", maxRenderSize, GraphicsFormat.R32_UInt);
+        }
+        
         public void Destroy()
         {
+            DestroyResource(ReconstructedDepth);
+            DestroyResource(DilatedMotionVectors);
+            DestroyResource(DilatedDepth);
             
+            DestroyResource(ref DisocclusionMask);
+            DestroyResource(ref PreviousInterpolationSource);
+            DestroyResource(ref OpticalFlowMotionVectorFieldY);
+            DestroyResource(ref OpticalFlowMotionVectorFieldX);
+            DestroyResource(ref Counters);
+            DestroyResource(ref InpaintingPyramid);
+            DestroyResource(ref GameMotionVectorFieldY);
+            DestroyResource(ref GameMotionVectorFieldX);
+            DestroyResource(ref ReconstructedDepthInterpolatedFrame);
+        }
+        
+        private static RenderTexture CreateResource(string name, Vector2Int size, GraphicsFormat format)
+        {
+            var rt = new RenderTexture(size.x, size.y, 0, format) { name = name, enableRandomWrite = true };
+            rt.Create();
+            return rt;
+        }
+
+        private static RenderTexture CreateResourceMips(string name, Vector2Int size, GraphicsFormat format)
+        {
+            int mipCount = 1 + Mathf.FloorToInt(Mathf.Log(Math.Max(size.x, size.y), 2.0f));
+            var rt = new RenderTexture(size.x, size.y, 0, format, mipCount) { name = name, enableRandomWrite = true, useMipMap = true, autoGenerateMips = false };
+            rt.Create();
+            return rt;
+        }
+        
+        private static ComputeBuffer CreateBuffer<TElem>(string name, int count)
+        {
+            return new ComputeBuffer(count, Marshal.SizeOf<TElem>());
+        }
+        
+        private static void CreateDoubleBufferedResource(RenderTexture[] resource, string name, Vector2Int size, GraphicsFormat format)
+        {
+            for (int i = 0; i < 2; ++i)
+            {
+                resource[i] = new RenderTexture(size.x, size.y, 0, format) { name = name + (i + 1), enableRandomWrite = true };
+                resource[i].Create();
+            }
+        }
+
+        private static void DestroyResource(ref RenderTexture resource)
+        {
+            if (resource == null)
+                return;
+            
+            resource.Release();
+            resource = null;
+        }
+
+        private static void DestroyResource(ref ComputeBuffer resource)
+        {
+            if (resource == null)
+                return;
+            
+            resource.Release();
+            resource = null;
+        }
+
+        private static void DestroyResource(RenderTexture[] resource)
+        {
+            for (int i = 0; i < resource.Length; ++i)
+                DestroyResource(ref resource[i]);
         }
     }
 }