From 312d8736ae0df55c9f33e4eb5c00e4cd77e1c33f Mon Sep 17 00:00:00 2001
From: Nicolas James <nj3ahxac@gmail.com>
Date: Mon, 6 Apr 2026 17:03:35 +1000
Subject: Add refactored VK_NV_low_latency2 impl, (fixes many threading issues)

---
 src/strategies/low_latency2/queue_strategy.hh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

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

diff --git a/src/strategies/low_latency2/queue_strategy.hh b/src/strategies/low_latency2/queue_strategy.hh
index 223f559..a090e1b 100644
--- a/src/strategies/low_latency2/queue_strategy.hh
+++ b/src/strategies/low_latency2/queue_strategy.hh
@@ -2,12 +2,31 @@
 #define STRATEGIES_LOW_LATENCY2_QUEUE_STRATEGY_HH_
 
 #include "strategies/queue_strategy.hh"
+#include "submission.hh"
+
+#include <atomic>
+#include <deque>
+#include <memory>
+#include <mutex>
+#include <unordered_map>
 
 namespace low_latency {
 
 class QueueContext;
 
 class LowLatency2QueueStrategy final : public QueueStrategy {
+  public:
+    static constexpr auto MAX_TRACKED_OBJECTS = 50;
+
+    // Mapping of present_id's to submissions. Grabbed later by the device
+    // strategy when we present and actually can associate them to some
+    // vkSwapchainKHR.
+    std::mutex mutex{};
+    std::unordered_map<std::uint64_t, std::deque<std::unique_ptr<Submission>>>
+        present_id_submissions{};
+    std::deque<std::uint64_t> present_id_ring{};
+    std::atomic<bool> is_out_of_band{}; // atomic so we don't need a lock check
+
   public:
     LowLatency2QueueStrategy(QueueContext& queue);
     virtual ~LowLatency2QueueStrategy();
@@ -18,6 +37,9 @@ class LowLatency2QueueStrategy final : public QueueStrategy {
     virtual void notify_submit(const VkSubmitInfo2& submit,
                                std::unique_ptr<Submission> submission) override;
     virtual void notify_present(const VkPresentInfoKHR& present) override;
+
+  public:
+    void notify_out_of_band();
 };
 
 } // namespace low_latency
-- 
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