1 files changed, 56 insertions, 0 deletions

diff --git a/src/video_core/renderer_vulkan/vk_master_semaphore.cpp b/src/video_core/renderer_vulkan/vk_master_semaphore.cpp
new file mode 100644
index 000000000..ae26e558d
--- /dev/null
+++ b/src/video_core/renderer_vulkan/vk_master_semaphore.cpp
@@ -0,0 +1,56 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <chrono>
+
+#include "core/settings.h"
+#include "video_core/renderer_vulkan/vk_device.h"
+#include "video_core/renderer_vulkan/vk_master_semaphore.h"
+#include "video_core/renderer_vulkan/wrapper.h"
+
+namespace Vulkan {
+
+using namespace std::chrono_literals;
+
+MasterSemaphore::MasterSemaphore(const VKDevice& device) {
+    static constexpr VkSemaphoreTypeCreateInfoKHR semaphore_type_ci{
+        .sType = VK_STRUCTURE_TYPE_SEMAPHORE_TYPE_CREATE_INFO_KHR,
+        .pNext = nullptr,
+        .semaphoreType = VK_SEMAPHORE_TYPE_TIMELINE_KHR,
+        .initialValue = 0,
+    };
+    static constexpr VkSemaphoreCreateInfo semaphore_ci{
+        .sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO,
+        .pNext = &semaphore_type_ci,
+        .flags = 0,
+    };
+    semaphore = device.GetLogical().CreateSemaphore(semaphore_ci);
+
+    if (!Settings::values.renderer_debug) {
+        return;
+    }
+    // Validation layers have a bug where they fail to track resource usage when using timeline
+    // semaphores and synchronizing with GetSemaphoreCounterValueKHR. To workaround this issue, have
+    // a separate thread waiting for each timeline semaphore value.
+    debug_thread = std::thread([this] {
+        u64 counter = 0;
+        while (!shutdown) {
+            if (semaphore.Wait(counter, 10'000'000)) {
+                ++counter;
+            }
+        }
+    });
+}
+
+MasterSemaphore::~MasterSemaphore() {
+    shutdown = true;
+
+    // This thread might not be started
+    if (debug_thread.joinable()) {
+        debug_thread.join();
+    }
+}
+
+} // namespace Vulkan