Organized folder structure;

Added new SSS Lut Baker;
Removed old SubsurfaceLookupTextureIntegrator;

Editor/SSS/SSSLutBakerView.cs

@@ -0,0 +1,170 @@
+using System.IO;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.Experimental.Rendering;
+using UnityEngine.Rendering;
+using UnityEngine.UIElements;
+
+namespace Misaki.HdrpToon.Editor
+{
+    internal class SSSLutBakerView : UnityEditor.EditorWindow
+    {
+        public enum Quality
+        {
+            [InspectorName("64")]
+            UltraLow = 64,
+            [InspectorName("128")]
+            VeryLow = 128,
+            [InspectorName("256")]
+            Low = 256,
+            [InspectorName("512")]
+            Medium = 512,
+            [InspectorName("1024")]
+            High = 1024,
+            [InspectorName("2048")]
+            VeryHigh = 2048,
+            [InspectorName("4096")]
+            UltraHigh = 4096,
+        }
+
+        private const int _PREVIEW_SIZE = 128;
+
+        [SerializeField]
+        private VisualTreeAsset _visualAsset;
+        [SerializeField]
+        private ComputeShader _bakerShader;
+
+        private RenderTexture _previewTexture;
+        private RenderTextureDescriptor _previewDescriptor;
+
+        public float scatterRadius = 1.0f;
+        public float intensity = 1.0f;
+        public Quality sampleCount = Quality.Low;
+        public bool applyTonemap = true;
+        public Quality outputResolution = Quality.Medium;
+        public int outputQuality = 100;
+
+        [MenuItem("Tools/UTS/SSS LUT Baker")]
+        private static void ShowWindow()
+        {
+            var window = GetWindow<SSSLutBakerView>(true, "SSS LUT Baker");
+            window.minSize = new Vector2(400, 650);
+            window.ShowUtility();
+        }
+
+        private void OnEnable()
+        {
+            _previewDescriptor = new RenderTextureDescriptor
+            {
+                width = _PREVIEW_SIZE,
+                height = _PREVIEW_SIZE,
+                volumeDepth = 1,
+                dimension = TextureDimension.Tex2D,
+                depthBufferBits = 0,
+                msaaSamples = 1,
+                graphicsFormat = GraphicsFormat.R8G8B8A8_UNorm,
+                enableRandomWrite = true,
+                sRGB = false,
+                useMipMap = false,
+            };
+
+            _previewTexture = RenderTexture.GetTemporary(_previewDescriptor);
+        }
+
+        private bool GenerateSSSLut(RenderTexture texture, int textureSize, bool production)
+        {
+            if (_bakerShader == null || !texture.enableRandomWrite)
+            {
+                return false;
+            }
+
+            _bakerShader.SetFloat("_ScatterRadius", scatterRadius);
+            _bakerShader.SetFloat("_Intensity", intensity);
+            _bakerShader.SetInt("_SampleCount", (int)sampleCount);
+            _bakerShader.SetInt("_ApplyTonemap", applyTonemap ? 1 : 0);
+            _bakerShader.SetInt("_TextureSize", textureSize);
+
+            _bakerShader.SetKeyword(new LocalKeyword(_bakerShader, "_PRODUCTION"), production);
+
+            _bakerShader.SetTexture(0, "_SSSLut", texture);
+
+            const int groupSizeX = 8;
+            const int groupSizeY = 8;
+            var threadGroupX = (textureSize + (groupSizeX - 1)) / groupSizeX;
+            var threadGroupY = (textureSize + (groupSizeY - 1)) / groupSizeY;
+            _bakerShader.Dispatch(0, threadGroupX, threadGroupY, 1);
+
+            return true;
+        }
+
+        private void BakePreview()
+        {
+            GenerateSSSLut(_previewTexture, _PREVIEW_SIZE, false);
+        }
+
+        private void Bake()
+        {
+            var outputPath = EditorUtility.SaveFilePanel("Export Texture", Application.dataPath, "SSS Lut", "jpg");
+            if (string.IsNullOrEmpty(outputPath))
+            {
+                return;
+            }
+
+            var outputDescriptor = _previewDescriptor;
+            outputDescriptor.width = (int)outputResolution;
+            outputDescriptor.height = (int)outputResolution;
+
+            var tempTexture = RenderTexture.GetTemporary(outputDescriptor);
+            var tempTexture2D = new Texture2D(outputDescriptor.width, outputDescriptor.height, TextureFormat.RGB24, false, true);
+
+            try
+            {
+                if (!GenerateSSSLut(tempTexture, (int)outputResolution, true))
+                {
+                    return;
+                }
+
+                RenderTexture.active = tempTexture;
+                tempTexture2D.ReadPixels(new Rect(0, 0, outputDescriptor.width, outputDescriptor.height), 0, 0);
+                tempTexture2D.Apply();
+                RenderTexture.active = null;
+
+                File.WriteAllBytes(outputPath, tempTexture2D.EncodeToJPG(outputQuality));
+                AssetDatabase.Refresh();
+            }
+            finally
+            {
+                RenderTexture.ReleaseTemporary(tempTexture);
+                DestroyImmediate(tempTexture2D);
+            }
+        }
+
+        private void CreateGUI()
+        {
+            if (_visualAsset == null)
+            {
+                return;
+            }
+
+            var visualTree = _visualAsset.Instantiate();
+            visualTree.StretchToParentSize();
+            visualTree.dataSource = this;
+
+            var previewImage = visualTree.Q<Image>("preview-image");
+            previewImage.image = _previewTexture;
+
+            var previewButton = visualTree.Q<Button>("preview-button");
+            previewButton.clickable.clicked += BakePreview;
+
+            var bakeButton = visualTree.Q<Button>("bake-button");
+            bakeButton.clickable.clicked += Bake;
+
+            rootVisualElement.Add(visualTree);
+        }
+
+        private void OnDestroy()
+        {
+            RenderTexture.ReleaseTemporary(_previewTexture);
+        }
+    }
+}