勉强完成延迟很高

kernel/src/kernel/frame.cpp

@@ -19,10 +19,17 @@ struct Render_Frame::Private {
     std::array<std::atomic_uint64_t, measurement_count> measurements{}; /* 每种原始耗时首次记录值的加一编码。 */
 };
 Render_Frame::Render_Frame(Frame_Identity identity) : d(std::make_unique<Private>()) {
+    begin(identity);
+}
+void Render_Frame::begin(Frame_Identity identity) noexcept {
     d->identity = identity;
     d->created_at = std::chrono::steady_clock::now();
     const auto system_now = std::chrono::system_clock::now().time_since_epoch();
     d->created_time_unix_ns = static_cast<std::uint64_t>(std::chrono::duration_cast<std::chrono::nanoseconds>(system_now).count());
+    for (auto& marker : d->markers)
+        marker.store(0, std::memory_order_relaxed);
+    for (auto& measurement : d->measurements)
+        measurement.store(0, std::memory_order_relaxed);
     d->markers[static_cast<std::size_t>(Frame_Trace_Marker::created)].store(encode_present_value(0), std::memory_order_relaxed);
 }
 Render_Frame::~Render_Frame() = default;

kernel/src/kernel/frame.hpp

@@ -26,11 +26,7 @@ enum class Frame_Trace_Marker : std::uint8_t {
     scene_render_finished,
     callback_started,
     callback_finished,
-    video_encode_queued,
-    video_encode_started,
-    video_encode_finished,
-    stream_publish_started,
-    stream_publish_finished,
+    frame_ready,
     count
 };
 enum class Frame_Trace_Measurement : std::uint8_t {
@@ -44,7 +40,6 @@ enum class Frame_Trace_Measurement : std::uint8_t {
     gpu_copy_ns,
     gpu_total_ns,
     readback_ns,
-    stream_publish_tail_ns,
     count
 };
 struct Frame_Identity {
@@ -69,6 +64,9 @@ public:
     void record(Frame_Trace_Measurement measurement, std::uint64_t value_ns) noexcept;
     [[nodiscard]] std::vector<Frame_Trace_Point> trace_points() const;
     [[nodiscard]] std::vector<Frame_Trace_Value> trace_values() const;
+protected:
+    /* 物理帧槽再次承载新逻辑帧时，重建其唯一身份和诊断时间原点。 */
+    void begin(Frame_Identity identity) noexcept;
 private:
     struct Private;
     std::unique_ptr<Private> d;                             /* 帧身份、时钟原点与原子诊断槽位的唯一所有权。 */