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Assets/Plugins/_MK/MKGlow/Scripts/MipBuffer.cs

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+//////////////////////////////////////////////////////
+// MK Glow Mip Buffer	    	    	       		//
+//					                                //
+// Created by Michael Kremmel                       //
+// www.michaelkremmel.de                            //
+// Copyright © 2021 All rights reserved.            //
+//////////////////////////////////////////////////////
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace MK.Glow
+{	
+	/// <summary>
+	/// Renderbuffer based on a mip setup
+	/// </summary>
+	internal sealed class MipBuffer
+	{
+		private RenderTarget[] _renderTargets = new RenderTarget[PipelineProperties.renderBufferSize];
+		internal RenderTarget[] renderTargets { get { return _renderTargets; } }
+
+		public MipBuffer(string name, RenderPipeline renderPipeline)
+		{
+			if(renderPipeline == RenderPipeline.SRP)
+			{
+				for(int i = 0; i < PipelineProperties.renderBufferSize; i++)
+				{
+					_renderTargets[i].identifier = Shader.PropertyToID(name + i);
+					#if UNITY_2018_2_OR_NEWER
+					_renderTargets[i].renderTargetIdentifier = new RenderTargetIdentifier(renderTargets[i].identifier, 0, CubemapFace.Unknown, -1);
+					#else
+					_renderTargets[i].renderTargetIdentifier = new RenderTargetIdentifier(renderTargets[i].identifier);
+					#endif
+				}
+			}
+			else
+			{
+				for(int i = 0; i < PipelineProperties.renderBufferSize; i++)
+				{
+					renderTargets[i].identifier = Shader.PropertyToID(name + i);
+				}
+			}
+		}
+
+		/// <summary>
+		/// Create a specific level of the the buffer
+		/// </summary>
+		/// <param name="renderContext"></param>
+		/// <param name="level"></param>
+		/// <param name="cmd"></param>
+		/// <param name="format"></param>
+		/// <param name="useComputeShaders"></param>
+		internal void CreateTemporary(RenderContext[] renderContext, int level, CommandBuffer cmd, RenderTextureFormat format, bool useComputeShaders, RenderPipeline renderPipeline)
+		{
+			if(renderPipeline == RenderPipeline.SRP)
+			{
+				#if UNITY_2017_1_OR_NEWER
+				cmd.GetTemporaryRT(renderTargets[level].identifier, renderContext[level].descriptor, FilterMode.Bilinear);
+				#else
+				cmd.GetTemporaryRT(renderTargets[level].identifier, renderContext[level].width, renderContext[level].height, 0, FilterMode.Bilinear, format, RenderTextureReadWrite.Default, 1, useComputeShaders);
+				#endif
+			}
+			else
+			{
+				renderTargets[level].renderTexture = PipelineExtensions.GetTemporary(renderContext[level], format);
+			}
+		}
+
+		/// <summary>
+		/// Clear a specific level of the buffer
+		/// </summary>
+		/// <param name="cmd"></param>
+		/// <param name="level"></param>
+		internal void ClearTemporary(CommandBuffer cmd, int level, RenderPipeline renderPipeline)
+		{
+			if(renderPipeline == RenderPipeline.SRP)
+				cmd.ReleaseTemporaryRT(renderTargets[level].identifier);
+			else
+				RenderTexture.ReleaseTemporary(renderTargets[level].renderTexture);
+		}
+	}
+}