阶段性完成

Assets/PotaToon/Shaders/OIT/OITFullscreenRender.shader

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+Shader "PotaToon/Hidden/OITFullscreenRender"
+{
+	Properties
+	{
+	}
+	SubShader
+	{
+        Tags { "RenderPipeline" = "UniversalPipeline" }
+		Pass
+		{
+			ZTest Always
+			ZWrite Off
+			Cull Off
+			// Blend One One
+			Blend One OneMinusSrcAlpha
+
+			HLSLPROGRAM
+			#pragma vertex OITVert
+			#pragma fragment OITFrag
+			#pragma target 5.0
+			// #pragma require randomwrite
+
+			#pragma multi_compile_local_fragment _ _OIT_ADDITIVE
+
+			#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+			#include "Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blit.hlsl"
+			#include "./LinkedListRendering.hlsl"
+
+			SAMPLER(sampler_BlitTexture);
+
+			Varyings OITVert(Attributes input)
+			{
+				Varyings output;
+
+			#if SHADER_API_GLES
+				float4 pos = input.positionOS;
+				float2 uv  = input.uv;
+			#else
+				float4 pos = GetFullScreenTriangleVertexPosition(input.vertexID);
+				float2 uv  = GetFullScreenTriangleTexCoord(input.vertexID);
+			#endif
+
+				output.positionCS = pos;
+				output.texcoord   = uv;
+				return output;
+			}
+
+			//Pixel function returns a solid color for each point.
+			float4 OITFrag(Varyings i, uint uSampleIndex : SV_SampleIndex) : SV_Target
+			{
+				// Retrieve current color from background texture
+				float4 color = SAMPLE_TEXTURE2D_X(_BlitTexture, sampler_BlitTexture, i.texcoord);
+				float4 finalColor = renderLinkedList(color, i.positionCS.xy, uSampleIndex);
+				return finalColor;
+			}
+			ENDHLSL
+		}
+	}
+}