split into multiple assemblies

Assets/Portal/Assets/Materials/Portal.mat

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Assets/Portal/Assets/Materials/Portal.mat.meta

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Assets/Portal/Assets/Materials/PortalShader.shader

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+Shader "Escape Room Engine/Portal"
+{
+    Properties
+    {
+        _LeftTex("Left Eye Texture", 2D) = "" {}
+        _RightTex("Right Eye Texture", 2D) = "" {}
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" }
+
+        Pass
+        {
+            // stencil the portal surface to cut it out from the portal frame
+            Stencil
+            {
+                Ref 1
+                Pass replace
+            }
+            
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #pragma multi_compile_instancing
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct Varyings
+            {
+                float4 positionHCS : SV_POSITION;
+                float4 positionScreen : TEXCOORD0;
+                UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+            uniform sampler2D _LeftTex, _RightTex;
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                UNITY_SETUP_INSTANCE_ID(IN);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
+                
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                // calculate the screen position which is used to map the portal texture onto the portal
+                OUT.positionScreen = ComputeScreenPos(OUT.positionHCS);
+                
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(IN);
+
+                const float2 uv = IN.positionScreen.xy / IN.positionScreen.w;
+
+                // sample from the correct texture depending on the eye rendered
+                return unity_StereoEyeIndex == 0 ? tex2D(_LeftTex, uv) : tex2D(_RightTex, uv);
+            }
+            ENDHLSL
+        }
+    }
+}

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