Add ultimate xr

Assets/UltimateXR/Runtime/Shaders/FX/PlanarReflection_URP.shader

@@ -0,0 +1,72 @@
+Shader "UltimateXR/FX/Stereo Planar Reflection (URP)"
+{
+    Properties
+    {
+        _Color("Albedo", Color) = (1,1,1,1)
+		_ReflectionTexLeft("ReflectionTextureLeft",   2D) = "white" {}
+		_ReflectionTexRight("ReflectionTextureRight", 2D) = "white" {}
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 200
+        
+        Pass
+		{
+			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
+			{
+				float4 vertex    : POSITION;
+				float2 uv        : TEXCOORD0;
+				float4 screenPos : TEXCOORD1;
+
+				UNITY_VERTEX_OUTPUT_STEREO
+			};
+
+			half4     _Color;
+			sampler2D _ReflectionTexLeft;
+			sampler2D _ReflectionTexRight;
+
+			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;
+				o.screenPos = ComputeScreenPos(o.vertex); 
+				return o;
+			}
+
+			fixed4 frag (v2f i) : SV_Target
+			{
+				UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
+
+				if(unity_StereoEyeIndex == 0)
+				{
+					return _Color * tex2D(_ReflectionTexLeft, i.screenPos.xy / i.screenPos.w);
+				}
+				
+				return _Color * tex2D(_ReflectionTexRight, i.screenPos.xy / i.screenPos.w);
+			}
+			
+			ENDCG
+		}
+    }
+}