stencil portals pass 1 and 2

Assets/Portal/Runtime/RenderPortals.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEngine.Rendering.Universal;
+
+namespace EscapeRoomEngine.Portal.Runtime
+{
+    public class RenderPortals : ScriptableRendererFeature
+    {
+        private class PortalRenderPass : ScriptableRenderPass
+        {
+            private RenderStateBlock _renderStateBlock;
+
+            private readonly Settings _settings;
+
+            public PortalRenderPass(Settings settings)
+            {
+                _settings = settings;
+                
+                renderPassEvent = RenderPassEvent.AfterRenderingOpaques;
+                _renderStateBlock = new RenderStateBlock(RenderStateMask.Nothing);
+            }
+
+            public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
+            {
+                var sortingCriteria = renderingData.cameraData.defaultOpaqueSortFlags;
+                var drawingSettings =
+                    CreateDrawingSettings(
+                        new List<ShaderTagId>
+                        {
+                            new("SRPDefaultUnlit"), new("UniversalForward"), new("UniversalForwardOnly")
+                        },
+                        ref renderingData, sortingCriteria);
+
+                // set stencil to portal
+                var filteringSettings = new FilteringSettings(RenderQueueRange.opaque, _settings.layer);
+                drawingSettings.overrideMaterial = _settings.material;
+                context.DrawRenderers(renderingData.cullResults, ref drawingSettings, ref filteringSettings, ref _renderStateBlock);
+            }
+        }
+
+        private PortalRenderPass _portalPass;
+
+        [Serializable]
+        public class Settings
+        {
+            public LayerMask layer;
+            public Material material;
+        }
+
+        public Settings settings = new();
+
+        public override void Create()
+        {
+            _portalPass = new PortalRenderPass(settings);
+        }
+
+        // Here you can inject one or multiple render passes in the renderer.
+        // This method is called when setting up the renderer once per-camera.
+        public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
+        {
+            renderer.EnqueuePass(_portalPass);
+        }
+    }
+}