render stencil portals (stereo)

Assets/Desert/Assets/Prefabs/Desert XR Origin.prefab

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

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Assets/Portal/Assets/Materials/PortalShader.shader

@@ -1,68 +0,0 @@
-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
-        }
-    }
-}

Assets/Portal/Assets/Materials/PortalShader.shader.meta

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Assets/Portal/Runtime/Portal.asmdef

@@ -4,6 +4,7 @@
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         "GUID:75469ad4d38634e559750d17036d5f7c",
         "GUID:15fc0a57446b3144c949da3e2b9737a9",
+        "GUID:df380645f10b7bc4b97d4f5eb6303d95",
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Assets/Portal/Runtime/Portal.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using EscapeRoomEngine.Engine.Runtime.Modules;
 using EscapeRoomEngine.Engine.Runtime.Utilities;
+using EscapeRoomEngine.VR.Runtime;
 using NaughtyAttributes;
 using UnityEngine;
 
@@ -87,12 +88,28 @@ namespace EscapeRoomEngine.Portal.Runtime
             }
         }
 
-        public Camera SetUpCamera(Camera playerCamera)
+        public Camera SetUpCamera(Camera playerCamera, Camera.MonoOrStereoscopicEye monoOrEye)
         {
             // place camera
-            var m = portalTransform.localToWorldMatrix * HalfRotation *
+            Matrix4x4 cameraTransform;
-                    linkedPortal.portalTransform.worldToLocalMatrix * playerCamera.transform.localToWorldMatrix;
+            if (monoOrEye == Camera.MonoOrStereoscopicEye.Mono)
-            playerCamera.transform.SetPositionAndRotation(m.GetPosition(), m.rotation);
+            {
+                cameraTransform = portalTransform.localToWorldMatrix * HalfRotation *
+                                  linkedPortal.portalTransform.worldToLocalMatrix *
+                                  playerCamera.transform.localToWorldMatrix;
+            }
+            else
+            {
+                // stereoRenderCounter = (stereoRenderCounter + 1) % 2;
+                var eye = monoOrEye == Camera.MonoOrStereoscopicEye.Left
+                    ? Camera.StereoscopicEye.Left
+                    : Camera.StereoscopicEye.Right;
+                cameraTransform = portalTransform.localToWorldMatrix * HalfRotation *
+                                  linkedPortal.portalTransform.worldToLocalMatrix *
+                                  Player.Instance.GetEye(eye).localToWorldMatrix;
+                playerCamera.projectionMatrix = playerCamera.GetStereoProjectionMatrix(eye);
+            }
+            playerCamera.transform.SetPositionAndRotation(cameraTransform.GetPosition(), cameraTransform.rotation);
         
             // set camera clip plane to portal (otherwise the wall behind the portal would be rendered)
             // calculating the clip plane: https://computergraphics.stackexchange.com/a/1506

Assets/Portal/Runtime/RenderPortalCameras.cs

@@ -16,9 +16,9 @@ namespace EscapeRoomEngine.Portal.Runtime
 
         private class PortalCameraRenderPass : ScriptableRenderPass
         {
-            private static readonly List<ShaderTagId> ShaderTagIds = new List<ShaderTagId>
+            private static readonly List<ShaderTagId> ShaderTagIds = new()
             {
-                new("SRPDefaultUnlit"), new("UniversalForward"), new("UniversalForwardOnly")
+                new ShaderTagId("SRPDefaultUnlit"), new ShaderTagId("UniversalForward"), new ShaderTagId("UniversalForwardOnly")
             };
 
             private RenderStateBlock _renderStateBlock;
@@ -74,8 +74,15 @@ namespace EscapeRoomEngine.Portal.Runtime
                             var originalPosition = cameraTransform.position;
                             var originalRotation = cameraTransform.rotation;
                             var originalProjection = camera.projectionMatrix;
-                            camera = linkedPortal.SetUpCamera(camera);
+                            camera = linkedPortal.SetUpCamera(camera,
-                            RenderingUtils.SetViewAndProjectionMatrices(_commandBuffer, camera.worldToCameraMatrix, GL.GetGPUProjectionMatrix(camera.projectionMatrix, true), false);
+                                camera.stereoEnabled
+                                    ? cameraData.xr.multipassId == 0
+                                        ? Camera.MonoOrStereoscopicEye.Left
+                                        : Camera.MonoOrStereoscopicEye.Right
+                                    : Camera.MonoOrStereoscopicEye.Mono);
+                            RenderingUtils.SetViewAndProjectionMatrices(_commandBuffer,
+                                camera.worldToCameraMatrix,
+                                GL.GetGPUProjectionMatrix(camera.projectionMatrix, true), false);
 
                             // execute command buffer
                             context.ExecuteCommandBuffer(_commandBuffer);

Assets/XR/Settings/OpenXR Package Settings.asset

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Assets/XR/XRGeneralSettings.asset

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