feat(rendering): add managed SRP renderer runtime

managed/XCEngine.ScriptCore/ScriptableRenderPipeline.cs

@@ -2,20 +2,44 @@ namespace XCEngine
 {
     public abstract class ScriptableRenderPipeline : Object
     {
+        private ScriptableRenderer m_renderer;
+
         protected ScriptableRenderPipeline()
         {
         }
 
+        protected internal virtual ScriptableRenderer CreateRenderer()
+        {
+            return null;
+        }
+
         protected internal virtual bool SupportsStageRenderGraph(
             CameraFrameStage stage)
         {
-            return false;
+            ScriptableRenderer renderer = GetOrCreateRenderer();
+            return renderer != null &&
+                   renderer.SupportsStageRenderGraph(stage);
         }
 
         protected internal virtual bool RecordStageRenderGraph(
             ScriptableRenderContext context)
         {
-            return false;
+            ScriptableRenderer renderer = GetOrCreateRenderer();
+            return renderer != null &&
+                   renderer.RecordStageRenderGraph(context);
+        }
+
+        protected ScriptableRenderer renderer =>
+            GetOrCreateRenderer();
+
+        private ScriptableRenderer GetOrCreateRenderer()
+        {
+            if (m_renderer == null)
+            {
+                m_renderer = CreateRenderer();
+            }
+
+            return m_renderer;
         }
     }
 }