Unity52GrabTexBug

Shader "GrabTexBug"
{
	Properties
	{
		[PerRendererData] 
		_MainTex ("Sprite Texture", 2D) = "white" {}
		_Color ("Tint", Color) = (1,1,1,1)
	}

	SubShader
	{
		Tags
		{ 
			"Queue" = "Transparent" 
			"RenderType" = "Transparent" 
		}

		Cull Off
		Lighting Off
		ZWrite Off
		Blend SrcAlpha OneMinusSrcAlpha
		
		GrabPass { }
		
		Pass
		{
			CGPROGRAM
			
			#include "UnityCG.cginc"
			
			#pragma vertex ComputeVertex
			#pragma fragment ComputeFragment
			
			sampler2D _MainTex;
			sampler2D _GrabTexture;
			fixed4 _Color;
			
			struct VertexInput
			{
				float4 vertex : POSITION;
				float4 color : COLOR;
				float2 texcoord : TEXCOORD0;
			};

			struct VertexOutput
			{
				float4 vertex : SV_POSITION;
				fixed4 color : COLOR;
				half2 texcoord : TEXCOORD0;
				float4 screenPos : TEXCOORD1;
			};
			
			VertexOutput ComputeVertex (VertexInput vertexInput)
			{
				VertexOutput vertexOutput;
				
				vertexOutput.vertex = mul(UNITY_MATRIX_MVP, vertexInput.vertex);
				vertexOutput.screenPos = vertexOutput.vertex;	
				vertexOutput.texcoord = vertexInput.texcoord;
				vertexOutput.color = vertexInput.color * _Color;

				return vertexOutput;
			}
			
			fixed4 ComputeFragment (VertexOutput vertexOutput) : SV_Target
			{
				return tex2D(_GrabTexture, vertexOutput.texcoord); 
			}
			
			ENDCG
		}
	}
	
	Fallback "Sprites/Default"
}