[vulkan] Add optional fence paratemer to acquireNextImage

We'll reset the fence prior to acquisition, so that the user of
this API won't have to do it.

src/d3d11/d3d11_swapchain.cpp

@@ -227,7 +227,7 @@ namespace dxvk {
       uint32_t imageIndex = 0;
 
       VkResult status = m_presenter->acquireNextImage(
-        sync.acquire, imageIndex);
+        sync.acquire, VK_NULL_HANDLE, imageIndex);
 
       while (status != VK_SUCCESS && status != VK_SUBOPTIMAL_KHR) {
         RecreateSwapChain(m_vsync);
@@ -236,7 +236,7 @@ namespace dxvk {
         sync = m_presenter->getSyncSemaphores();
 
         status = m_presenter->acquireNextImage(
-          sync.acquire, imageIndex);
+          sync.acquire, VK_NULL_HANDLE, imageIndex);
       }
 
       // Use an appropriate texture filter depending on whether

src/vulkan/vulkan_presenter.cpp

@@ -42,11 +42,18 @@ namespace dxvk::vk {
 
   VkResult Presenter::acquireNextImage(
           VkSemaphore     signal,
+          VkFence         fence,
           uint32_t&       index) {
-    VkResult status = m_vkd->vkAcquireNextImageKHR(
+    VkResult status;
+
+    if (fence && ((status = m_vkd->vkResetFences(
+        m_vkd->device(), 1, &fence)) != VK_SUCCESS))
+      return status;
+
+    status = m_vkd->vkAcquireNextImageKHR(
       m_vkd->device(), m_swapchain,
       std::numeric_limits<uint64_t>::max(),
-      signal, VK_NULL_HANDLE, &m_imageIndex);
+      signal, fence, &m_imageIndex);
     
     if (status != VK_SUCCESS
      && status != VK_SUBOPTIMAL_KHR)

src/vulkan/vulkan_presenter.h

@@ -123,11 +123,13 @@ namespace dxvk::vk {
      * must be recreated and a new image must
      * be acquired before proceeding.
      * \param [in] signal Semaphore to signal
+     * \param [in] fence Fence to signal (optional)
      * \param [out] index Acquired image index
      * \returns Status of the operation
      */
     VkResult acquireNextImage(
             VkSemaphore     signal,
+            VkFence         fence,
             uint32_t&       index);
     
     /**