gistfile1.txt

Shader "Custom/occlusion_multipass_shader"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		[PerRendererData] _OcclusionColor("Tint", Color) = (1,0,1,1)
	}

	SubShader
	{
		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
			"PreviewType" = "Plane"
			"CanUseSpriteAtlas" = "True"
		}

			Cull Off
			Lighting Off
			ZWrite Off
			Blend SrcAlpha OneMinusSrcAlpha

			Pass
			{
				Stencil 
				{
					Ref 255
					Comp notequal
				}
				CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#include "UnityCG.cginc"

				struct appdata_t
				{
					float4 vertex   : POSITION;
					float4 color    : COLOR;
					float2 texcoord : TEXCOORD0;
				};

				struct v2f
				{
					float4 vertex   : SV_POSITION;
					fixed4 color : COLOR;
					half2 texcoord  : TEXCOORD0;
				};

				sampler2D _MainTex;
				fixed4 _OcclusionColor;

				v2f vert(appdata_t IN)
				{
					v2f OUT;
					OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
					OUT.texcoord = IN.texcoord;
					OUT.color = IN.color;
					return OUT;
				}


				fixed4 frag(v2f IN) : SV_Target
				{
					fixed4 c = tex2D(_MainTex, IN.texcoord) * IN.color;
					return c;
				}
			ENDCG
		}
		Pass
		{
			Stencil
			{
				Ref 255
				Comp equal
			}
			CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

			struct appdata_t
			{
				float4 vertex   : POSITION;
				float4 color    : COLOR;
				float2 texcoord : TEXCOORD0;
			};

			struct v2f
			{
				float4 vertex   : SV_POSITION;
				fixed4 color : COLOR;
				half2 texcoord  : TEXCOORD0;
			};

			sampler2D _MainTex;
			fixed4 _OcclusionColor;

			v2f vert(appdata_t IN)
			{
				v2f OUT;
				OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
				OUT.texcoord = IN.texcoord;
				OUT.color = IN.color;
				return OUT;
			}


			fixed4 frag(v2f IN) : SV_Target
			{
				fixed4 c = tex2D(_MainTex, IN.texcoord);
				c.rgb = _OcclusionColor.rgb;
				return c;
			}
		ENDCG
		}
	}
}