阶段性完成

Assets/OtherPlugins/Le Tai's Asset/TranslucentImage/Script/Utilities/BlurExecutor.cs

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+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace LeTai.Asset.TranslucentImage
+{
+public static class BlurExecutor
+{
+    static readonly int[] TEMP_RT = new int[14];
+
+    static BlurExecutor()
+    {
+        for (var i = 0; i < TEMP_RT.Length; i++)
+        {
+            TEMP_RT[i] = Shader.PropertyToID($"TI_intermediate_rt_{i}");
+        }
+    }
+
+    public readonly struct BlurExecutionData
+    {
+        public readonly RenderTargetIdentifier sourceTex;
+        public readonly TranslucentImageSource blurSource;
+        public readonly IBlurAlgorithm         blurAlgorithm;
+
+        public BlurExecutionData(
+            RenderTargetIdentifier sourceTex,
+            TranslucentImageSource blurSource,
+            IBlurAlgorithm         blurAlgorithm
+        )
+        {
+            this.sourceTex     = sourceTex;
+            this.blurSource    = blurSource;
+            this.blurAlgorithm = blurAlgorithm;
+        }
+    }
+
+    public static void ExecuteBlurWithTempTextures(CommandBuffer cmd, ref BlurExecutionData data)
+    {
+        var desc = data.blurSource.BlurredScreen.descriptor;
+        desc.msaaSamples     = 1;
+        desc.useMipMap       = false;
+        desc.depthBufferBits = 0;
+
+        var cropRegionSize = data.blurSource.BlurRegion.size;
+        var scratchesCount = data.blurAlgorithm.GetScratchesCount(desc.width / cropRegionSize.x,
+                                                                  desc.height / cropRegionSize.y);
+        for (int i = 0; i < scratchesCount; i++)
+        {
+            data.blurAlgorithm.GetNextScratchDescriptor(ref desc);
+            cmd.GetTemporaryRT(TEMP_RT[i], desc, FilterMode.Bilinear);
+            data.blurAlgorithm.SetScratch(i, TEMP_RT[i]);
+        }
+
+        {
+            ExecuteBlur(cmd, ref data);
+        }
+
+        for (int i = 0; i < scratchesCount; i++)
+            cmd.ReleaseTemporaryRT(TEMP_RT[i]);
+    }
+
+    public static void ExecuteBlur(CommandBuffer cmd, ref BlurExecutionData data)
+    {
+        var blurSource = data.blurSource;
+
+        data.blurAlgorithm.Blur(cmd,
+                                data.sourceTex,
+                                blurSource.BlurRegion,
+                                blurSource.ActiveRegion,
+                                blurSource.BackgroundFill,
+                                blurSource.BlurredScreen);
+    }
+}
+}