From a9a083ea5c649498d2f12e611dbc7c767d152130 Mon Sep 17 00:00:00 2001
From: Nicolas James <nj3ahxac@gmail.com>
Date: Mon, 6 Apr 2026 12:18:10 +1000
Subject: Add WIP refactored reflex impl

---
 src/strategies/low_latency2/swapchain_monitor.hh | 72 ++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/strategies/low_latency2/swapchain_monitor.hh

(limited to 'src/strategies/low_latency2/swapchain_monitor.hh')

diff --git a/src/strategies/low_latency2/swapchain_monitor.hh b/src/strategies/low_latency2/swapchain_monitor.hh
new file mode 100644
index 0000000..9031bbb
--- /dev/null
+++ b/src/strategies/low_latency2/swapchain_monitor.hh
@@ -0,0 +1,72 @@
+
+#ifndef SWAPCHAIN_MONITOR_HH_
+#define SWAPCHAIN_MONITOR_HH_
+
+#include <vulkan/vulkan.h>
+
+#include <chrono>
+#include <condition_variable>
+#include <deque>
+#include <memory>
+#include <mutex>
+#include <thread>
+
+#include "submission.hh"
+
+namespace low_latency {
+
+class DeviceContext;
+
+class SwapchainMonitor final {
+  private:
+    struct WakeupSemaphore {
+        VkSemaphore timeline_semaphore{};
+        std::uint64_t value{};
+
+      public:
+        void signal(const DeviceContext& device) const;
+    };
+
+    std::unique_ptr<std::deque<Submission>> pending_submissions{};
+
+    // A pairing of semaphore -> submissions.
+    // If the Submissions completes then signal the bundled semaphore.
+    struct SemaphoreSubmissions {
+        WakeupSemaphore wakeup_semaphore{};
+        std::unique_ptr<std::deque<Submission>> submissions{};
+    };
+    std::optional<SemaphoreSubmissions> semaphore_submission{};
+
+  protected:
+    const DeviceContext& device;
+
+    std::mutex mutex{};
+    std::chrono::microseconds present_delay{};
+    bool was_low_latency_requested{};
+
+    std::condition_variable_any cv{};
+    std::jthread monitor_worker{};
+
+    void do_monitor(const std::stop_token stoken);
+
+  public:
+    SwapchainMonitor(const DeviceContext& device);
+    SwapchainMonitor(const SwapchainMonitor&) = delete;
+    SwapchainMonitor(SwapchainMonitor&&) = delete;
+    SwapchainMonitor operator=(const SwapchainMonitor&) = delete;
+    SwapchainMonitor operator=(SwapchainMonitor&&) = delete;
+    ~SwapchainMonitor();
+
+  public:
+    void update_params(const bool was_low_latency_requested,
+                       const std::chrono::microseconds delay);
+
+    void notify_semaphore(const VkSemaphore& timeline_semaphore,
+                          const std::uint64_t& value);
+
+    void attach_work(std::unique_ptr<std::deque<Submission>> submissions);
+};
+
+} // namespace low_latency
+
+#endif
\ No newline at end of file
-- 
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