vk_scheduler: Add api for defering operations (#311)

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -100,6 +100,12 @@ void Scheduler::SubmitExecution(vk::Semaphore signal_semaphore, vk::Semaphore wa
     master_semaphore.SubmitWork(current_cmdbuf, wait_semaphore, signal_semaphore, signal_value);
     master_semaphore.Refresh();
     AllocateWorkerCommandBuffers();
+
+    // Apply pending operations
+    while (IsFree(pending_ops.back().gpu_tick)) {
+        pending_ops.back().callback();
+        pending_ops.pop();
+    }
 }
 
 } // namespace Vulkan

src/video_core/renderer_vulkan/vk_scheduler.h

@@ -71,6 +71,11 @@ public:
         return &master_semaphore;
     }
 
+    /// Defers an operation until the gpu has reached the current cpu tick.
+    void DeferOperation(auto&& func) {
+        pending_ops.emplace(func, CurrentTick());
+    }
+
     std::mutex submit_mutex;
 
 private:
@@ -84,6 +89,11 @@ private:
     CommandPool command_pool;
     vk::CommandBuffer current_cmdbuf;
     std::condition_variable_any event_cv;
+    struct PendingOp {
+        std::function<void()> callback;
+        u64 gpu_tick;
+    };
+    std::queue<PendingOp> pending_ops;
     RenderState render_state;
     bool is_rendering = false;
     tracy::VkCtxScope* profiler_scope{};