Tighten URP pass queue snapshot ownership

engine/src/Rendering/Execution/CameraFramePlan.cpp

@@ -1,10 +1,28 @@
 #include <XCEngine/Rendering/Execution/CameraFramePlan.h>
 
+#include <atomic>
+
 namespace XCEngine {
 namespace Rendering {
 
 namespace {
 
+uint64_t AllocateCameraFramePlanId() {
+    static std::atomic<uint64_t> s_nextFramePlanId{ 1u };
+    uint64_t framePlanId =
+        s_nextFramePlanId.fetch_add(
+            1u,
+            std::memory_order_relaxed);
+    if (framePlanId == 0u) {
+        framePlanId =
+            s_nextFramePlanId.fetch_add(
+                1u,
+                std::memory_order_relaxed);
+    }
+
+    return framePlanId;
+}
+
 CameraFrameFullscreenStagePlan* GetMutableFullscreenStagePlan(
     CameraFramePlan& plan,
     CameraFrameStage stage) {
@@ -59,6 +77,7 @@ RenderSurface CameraFramePlan::BuildCameraDepthOnlySurfaceTemplate(
 
 CameraFramePlan CameraFramePlan::FromRequest(const CameraRenderRequest& request) {
     CameraFramePlan plan = {};
+    plan.framePlanId = AllocateCameraFramePlanId();
     plan.request = request;
     plan.shadowCaster = request.shadowCaster;
     plan.directionalShadow = request.directionalShadow;