调整项目目录

Assets/GameMain/Tilemap/Shader/SH Sprite Shadow Mask.shader

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+Shader "Cainos/Pixel Art Top Down - Basic/Sprite Default - Shadow Mask"
+{
+	Properties
+	{
+		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+		[HDR] _Color ("Tint", Color) = (1,1,1,1)
+		_AlphaClip ("Alpha Clip" , Float) = 0.05
+
+		[IntRange] _StencilRef("Stencil Ref Value", Range(0,255)) = 0
+
+		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
+		[HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)
+		[HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)
+		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
+		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
+	}
+
+		SubShader
+		{
+			Tags
+			{
+				"Queue" = "Transparent"
+				"IgnoreProjector" = "True"
+				"RenderType" = "Transparent"
+				"PreviewType" = "Plane"
+				"CanUseSpriteAtlas" = "True"
+			}
+
+			//Work together with shader "SH Sprite Shadow"
+			//to make sure shadow only get drawn within objects with this shader
+			Stencil
+			{
+				Ref[_StencilRef]
+				Comp Always
+				Pass Replace
+			}
+
+			Cull Off
+			Lighting Off
+			ZWrite Off
+			Blend One OneMinusSrcAlpha
+
+			Pass
+			{
+			CGPROGRAM
+				#pragma vertex SpriteVert
+				#pragma fragment Frag
+				#pragma target 2.0
+				#pragma multi_compile_instancing
+				#pragma multi_compile _ PIXELSNAP_ON
+				#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
+				#include "UnitySprites.cginc"
+
+				float _AlphaClip;
+
+			fixed4 Frag(v2f IN) : SV_Target
+			{
+
+
+				fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
+
+				clip(c.a - _AlphaClip);
+
+				c.rgb *= c.a;
+				return c;
+			}
+
+		ENDCG
+		}
+	}
+}

Assets/GameMain/Tilemap/Shader/SH Sprite Shadow Mask.shader.meta

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+fileFormatVersion: 2
+guid: 1ecad76f5afc08c4baa59e2c3946bd55
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Tilemap/Shader/SH Sprite Shadow.shader

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+Shader "Cainos/Pixel Art Top Down - Basic/Sprite Default - Shadow"
+{
+	Properties
+	{
+		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+		_Color ("Tint", Color) = (1,1,1,1)
+
+		[IntRange] _StencilRef("Stencil Ref Value", Range(0,255)) = 0
+
+		[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
+		[HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)
+		[HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)
+		[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
+		[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
+	}
+
+	SubShader
+	{
+		Tags
+		{ 
+			"Queue"="Transparent" 
+			"IgnoreProjector"="True" 
+			"RenderType"="Transparent" 
+			"PreviewType"="Plane"
+			"CanUseSpriteAtlas"="True"
+		}
+
+		//Use stencil to make sure shadow get only drawn once
+		//And only within object with shader "SH Sprite Shadow Mask"
+		Stencil
+		{
+			Ref [_StencilRef]
+			Comp Equal
+			Pass Zero
+		}
+
+		Cull Off
+		Lighting Off
+		ZWrite Off
+		Blend One OneMinusSrcAlpha
+
+		Pass
+		{
+		CGPROGRAM
+			#pragma vertex SpriteVert
+			#pragma fragment Frag
+			#pragma target 2.0
+			#pragma multi_compile_instancing
+			#pragma multi_compile _ PIXELSNAP_ON
+			#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
+			#include "UnitySprites.cginc"
+
+			fixed4 Frag(v2f IN) : SV_Target
+			{
+				fixed4 c = IN.color * _Color;
+				c.a *= SampleSpriteTexture(IN.texcoord).a;
+
+				clip(c.a - 0.01f);
+
+				c.rgb *= c.a;
+				return c;
+			}
+
+
+		ENDCG
+		}
+	}
+}

Assets/GameMain/Tilemap/Shader/SH Sprite Shadow.shader.meta

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+fileFormatVersion: 2
+guid: 6550f6ce69d62b841b4c4f6818d8e73c
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: