Add shaders

Sources/Shaders/VignetteShader.shader

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+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+Shader "Hidden/VignetteShader" {
+	Properties {
+		_MainTex ("Base (RGB)", 2D) = "" {}
+	}
+	
+	CGINCLUDE
+	
+	#include "UnityCG.cginc"
+	
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 uv : TEXCOORD0;
+	};
+	
+	sampler2D _MainTex;
+	
+	float4 _MainTex_TexelSize;
+	float vignetteIntensity;
+		
+	v2f vert( appdata_img v ) {
+		v2f o;
+		o.pos = UnityObjectToClipPos(v.vertex);	
+		
+		o.uv = v.texcoord.xy;
+		return o;
+	} 
+	
+	half4 frag(v2f i) : SV_Target {
+		half2 coords = i.uv;
+		half2 uv = i.uv;
+		
+		coords = (coords - 0.5) * 2.0;		
+		half coordDot = dot (coords,coords);
+		half4 color = tex2D (_MainTex, uv);	 
+		 		 
+		float mask = 1.0 - coordDot * vignetteIntensity; 
+		return color * mask;
+	}
+
+	ENDCG 
+	
+Subshader {
+ Pass {
+      ZTest Always Cull Off ZWrite Off
+
+      CGPROGRAM
+      
+      #pragma vertex vert
+      #pragma fragment frag
+
+      ENDCG
+  }
+}
+	
+Fallback off
+
+} // shader