Formalize render object id contract

engine/src/Rendering/Extraction/RenderSceneUtility.cpp

@@ -15,6 +15,16 @@
 namespace XCEngine {
 namespace Rendering {
 
+namespace {
+
+RenderObjectId BuildRenderObjectIdOrInvalid(const Components::GameObject& gameObject) {
+    RenderObjectId renderObjectId = kInvalidRenderObjectId;
+    TryConvertRuntimeObjectIdToRenderObjectId(gameObject.GetID(), renderObjectId);
+    return renderObjectId;
+}
+
+} // namespace
+
 RenderCameraData BuildRenderCameraData(
     const Components::CameraComponent& camera,
     uint32_t viewportWidth,
@@ -89,6 +99,7 @@ void AppendRenderItemsForGameObject(
     const Math::Matrix4x4 localToWorld = gameObject.GetTransform()->GetLocalToWorldMatrix();
     const Math::Vector3 worldPosition = localToWorld.GetTranslation();
     const float cameraDistanceSq = (worldPosition - cameraPosition).SqrMagnitude();
+    const RenderObjectId renderObjectId = BuildRenderObjectIdOrInvalid(gameObject);
     const Containers::Array<Resources::MeshSection>& sections = mesh->GetSections();
 
     if (!sections.Empty()) {
@@ -101,6 +112,7 @@ void AppendRenderItemsForGameObject(
             visibleItem.meshRenderer = meshRenderer;
             visibleItem.mesh = mesh;
             visibleItem.materialIndex = section.materialID;
+            visibleItem.renderObjectId = renderObjectId;
             visibleItem.sectionIndex = static_cast<Core::uint32>(sectionIndex);
             visibleItem.hasSection = true;
             visibleItem.material = ResolveMaterial(meshRenderer, mesh, section.materialID);
@@ -117,6 +129,7 @@ void AppendRenderItemsForGameObject(
     visibleItem.meshFilter = meshFilter;
     visibleItem.meshRenderer = meshRenderer;
     visibleItem.mesh = mesh;
+    visibleItem.renderObjectId = renderObjectId;
     visibleItem.materialIndex = 0;
     visibleItem.sectionIndex = 0;
     visibleItem.hasSection = false;