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Assets/Samples/XR Interaction Toolkit/2.3.2/Tunneling Vignette/TunnelingVignette.shader

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+Shader "VR/TunnelingVignette"
+{
+    Properties
+    {
+        _ApertureSize("Aperture Size", Range(0, 1)) = 0.7
+        _FeatheringEffect("Feathering Effect", Range(0, 1)) = 0.2
+        _VignetteColor("Vignette Color", Color) = (0, 0, 0, 1)
+        _VignetteColorBlend("Vignette Color Blend", Color) = (0, 0, 0, 1)
+    }
+        SubShader
+    {
+        Tags { "Queue" = "Transparent+5" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
+        LOD 100
+
+        Pass
+        {
+            Blend SrcAlpha OneMinusSrcAlpha
+            ZTest Always
+            ZWrite Off
+
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                float4 vertex : SV_POSITION;
+
+                UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+            float4 _VignetteColor;
+            float4 _VignetteColorBlend;
+            float _ApertureSize;
+            float _FeatheringEffect;
+
+            v2f vert(appdata v)
+            {
+                v2f o;
+
+                UNITY_SETUP_INSTANCE_ID(v);
+                UNITY_INITIALIZE_OUTPUT(v2f, o);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex);
+
+            fixed4 frag(v2f i) : SV_Target
+            {
+                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
+
+                float uvY = i.uv.y;
+                float alphaMin = (0.5 - sqrt(0.25 - ((_ApertureSize * _ApertureSize) * 0.25)));
+                float alpha = saturate(((uvY - alphaMin) / (_FeatheringEffect * _FeatheringEffect + 0.0001)));
+                fixed4 color = lerp(_VignetteColor, _VignetteColorBlend, uvY * 2);
+                color.w *= alpha;
+
+                return color;
+            }
+            ENDCG
+        }
+    }
+}