[dxvk] Export DxvkDeviceQueue from DxvkDevice

Access to the Vulkan queues provided by the DXVK device
is required for external Vulkan libraries to work.

src/dxvk/dxvk_device.cpp

@@ -18,12 +18,16 @@ namespace dxvk {
     m_metaClearObjects(new DxvkMetaClearObjects (vkd)),
     m_unboundResources(this),
     m_submissionQueue (this) {
+    m_graphicsQueue.queueFamily = m_adapter->graphicsQueueFamily();
+    m_presentQueue.queueFamily  = m_adapter->presentQueueFamily();
+    
     m_vkd->vkGetDeviceQueue(m_vkd->device(),
-      m_adapter->graphicsQueueFamily(), 0,
-      &m_graphicsQueue);
+      m_graphicsQueue.queueFamily, 0,
+      &m_graphicsQueue.queueHandle);
+    
     m_vkd->vkGetDeviceQueue(m_vkd->device(),
-      m_adapter->presentQueueFamily(), 0,
-      &m_presentQueue);
+      m_presentQueue.queueFamily, 0,
+      &m_presentQueue.queueHandle);
   }
   
   
@@ -202,7 +206,7 @@ namespace dxvk {
       std::lock_guard<sync::Spinlock> statLock(m_statLock);
       
       m_statCounters.addCtr(DxvkStatCounter::QueuePresentCount, 1);
-      return m_vkd->vkQueuePresentKHR(m_presentQueue, &presentInfo);
+      return m_vkd->vkQueuePresentKHR(m_presentQueue.queueHandle, &presentInfo);
     }
   }
   
@@ -234,7 +238,8 @@ namespace dxvk {
       m_statCounters.addCtr(DxvkStatCounter::QueueSubmitCount, 1);
       
       status = commandList->submit(
-        m_graphicsQueue, waitSemaphore, wakeSemaphore);
+        m_graphicsQueue.queueHandle,
+        waitSemaphore, wakeSemaphore);
     }
     
     if (status == VK_SUCCESS) {

src/dxvk/dxvk_device.h

@@ -27,6 +27,17 @@ namespace dxvk {
   
   class DxvkInstance;
   
+  /**
+   * \brief Device queue
+   * 
+   * Stores a Vulkan queue and the
+   * queue family that it belongs to.
+   */
+  struct DxvkDeviceQueue {
+    uint32_t  queueFamily = 0;
+    VkQueue   queueHandle = VK_NULL_HANDLE;
+  };
+  
   /**
    * \brief DXVK device
    * 
@@ -66,6 +77,17 @@ namespace dxvk {
       return m_vkd->device();
     }
     
+    /**
+     * \brief Graphics queue properties
+     * 
+     * Handle and queue family index of
+     * the queue used for rendering.
+     * \returns Graphics queue info
+     */
+    DxvkDeviceQueue graphicsQueue() const {
+      return m_graphicsQueue;
+    }
+    
     /**
      * \brief The adapter
      * 
@@ -291,6 +313,27 @@ namespace dxvk {
       const Rc<DxvkSemaphore>&        waitSync,
       const Rc<DxvkSemaphore>&        wakeSync);
     
+    /**
+     * \brief Locks submission queue
+     * 
+     * Since Vulkan queues are only meant to be accessed
+     * from one thread at a time, external libraries need
+     * to lock the queue before submitting command buffers.
+     */
+    void lockSubmission() {
+      m_submissionLock.lock();
+    }
+    
+    /**
+     * \brief Unlocks submission queue
+     * 
+     * Releases the Vulkan queues again so that DXVK
+     * itself can use them for submissions again.
+     */
+    void unlockSubmission() {
+      m_submissionLock.unlock();
+    }
+    
     /**
      * \brief Waits until the device becomes idle
      * 
@@ -318,9 +361,9 @@ namespace dxvk {
     sync::Spinlock            m_statLock;
     DxvkStatCounters          m_statCounters;
     
-    std::mutex m_submissionLock;
-    VkQueue m_graphicsQueue = VK_NULL_HANDLE;
-    VkQueue m_presentQueue  = VK_NULL_HANDLE;
+    std::mutex                m_submissionLock;
+    DxvkDeviceQueue           m_graphicsQueue;
+    DxvkDeviceQueue           m_presentQueue;
     
     DxvkRecycler<DxvkCommandList,  16> m_recycledCommandLists;
     DxvkRecycler<DxvkStagingBuffer, 4> m_recycledStagingBuffers;