refactor(rendering): formalize camera frame stage contracts

engine/src/Rendering/Pipelines/ScriptableRenderPipelineHost.cpp

@@ -1,5 +1,8 @@
 #include "Rendering/Pipelines/ScriptableRenderPipelineHost.h"
 
+#include "Rendering/Passes/BuiltinDepthOnlyPass.h"
+#include "Rendering/Passes/BuiltinObjectIdPass.h"
+#include "Rendering/Passes/BuiltinShadowCasterPass.h"
 #include "Rendering/Pipelines/BuiltinForwardPipeline.h"
 
 namespace XCEngine {
@@ -29,6 +32,18 @@ std::unique_ptr<RenderPipelineRenderer> CreateMainSceneRendererFromAsset(
     return std::make_unique<BuiltinForwardPipeline>();
 }
 
+void InstallDefaultStandaloneStagePasses(RenderPipeline& pipeline) {
+    pipeline.SetCameraFrameStandalonePass(
+        CameraFrameStage::ObjectId,
+        std::make_unique<Passes::BuiltinObjectIdPass>());
+    pipeline.SetCameraFrameStandalonePass(
+        CameraFrameStage::DepthOnly,
+        std::make_unique<Passes::BuiltinDepthOnlyPass>());
+    pipeline.SetCameraFrameStandalonePass(
+        CameraFrameStage::ShadowCaster,
+        std::make_unique<Passes::BuiltinShadowCasterPass>());
+}
+
 } // namespace
 
 ScriptableRenderPipelineHost::ScriptableRenderPipelineHost()
@@ -37,6 +52,7 @@ ScriptableRenderPipelineHost::ScriptableRenderPipelineHost()
 
 ScriptableRenderPipelineHost::ScriptableRenderPipelineHost(
     std::unique_ptr<RenderPipelineRenderer> mainSceneRenderer) {
+    InstallDefaultStandaloneStagePasses(*this);
     ResetMainSceneRenderer(std::move(mainSceneRenderer));
 }
 
@@ -46,6 +62,7 @@ ScriptableRenderPipelineHost::ScriptableRenderPipelineHost(
         mainSceneRendererAsset != nullptr
             ? std::move(mainSceneRendererAsset)
             : CreateDefaultMainSceneRendererAsset()) {
+    InstallDefaultStandaloneStagePasses(*this);
     ResetMainSceneRenderer(
         CreateMainSceneRendererFromAsset(m_mainSceneRendererAsset));
 }
@@ -79,6 +96,7 @@ void ScriptableRenderPipelineHost::Shutdown() {
     if (m_mainSceneRenderer != nullptr) {
         m_mainSceneRenderer->Shutdown();
     }
+    ShutdownCameraFrameStandalonePasses();
 }
 
 bool ScriptableRenderPipelineHost::SupportsMainSceneRenderGraph() const {