[d3d11] Don't immediately synchronize after present

This will actually enable asynchronous presentation.
Improves performance in Quake Champions.

src/d3d11/d3d11_swapchain.cpp

@@ -34,6 +34,7 @@ namespace dxvk {
     InitRenderState();
     InitSamplers();
     InitShaders();
+    InitOptions();
   }
 
 
@@ -194,8 +195,7 @@ namespace dxvk {
 
 
   void D3D11SwapChain::PresentImage(UINT SyncInterval) {
-    // Wait for the sync event so that we
-    // respect the maximum frame latency
+    // Wait for the sync event so that we respect the maximum frame latency
     Rc<DxvkEvent> syncEvent = m_dxgiDevice->GetFrameSyncEvent(m_desc.BufferCount);
     syncEvent->wait();
     
@@ -203,6 +203,9 @@ namespace dxvk {
       m_hud->update();
 
     for (uint32_t i = 0; i < SyncInterval || i < 1; i++) {
+      if (m_asyncPresent)
+        SynchronizePresent();
+
       m_context->beginRecording(
         m_device->createCommandList());
       
@@ -309,15 +312,26 @@ namespace dxvk {
       m_device->presentImage(m_presenter,
         sync.present, &m_presentStatus);
 
-      status = m_device->waitForSubmission(&m_presentStatus);
+      if (!m_asyncPresent)
+        SynchronizePresent();
+    }
+  }
+
+
+  void D3D11SwapChain::SynchronizePresent() {
+    // Recreate swap chain if the previous present call failed
+    VkResult status = m_device->waitForSubmission(&m_presentStatus);
     
     if (status != VK_SUCCESS)
       RecreateSwapChain(m_vsync);
   }
-  }
 
 
   void D3D11SwapChain::RecreateSwapChain(BOOL Vsync) {
+    // Ensure that we can safely destroy the swap chain
+    m_device->waitForSubmission(&m_presentStatus);
+    m_presentStatus.result = VK_SUCCESS;
+
     vk::PresenterDesc presenterDesc;
     presenterDesc.imageExtent     = { m_desc.Width, m_desc.Height };
     presenterDesc.imageCount      = PickImageCount(m_desc.BufferCount + 1);
@@ -582,6 +596,16 @@ namespace dxvk {
   }
 
 
+  void D3D11SwapChain::InitOptions() {
+    // Not synchronizing after present seems to increase
+    // the likelyhood of hangs on Nvidia for some reason.
+    m_asyncPresent = !m_device->adapter()->matchesDriver(
+      DxvkGpuVendor::Nvidia, VK_DRIVER_ID_NVIDIA_PROPRIETARY_KHR, 0, 0);
+    
+    applyTristate(m_asyncPresent, m_parent->GetOptions()->asyncPresent);
+  }
+
+
   void D3D11SwapChain::InitRenderState() {
     m_iaState.primitiveTopology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
     m_iaState.primitiveRestart  = VK_FALSE;

src/d3d11/d3d11_swapchain.h

@@ -120,8 +120,12 @@ namespace dxvk {
     bool                    m_dirty = true;
     bool                    m_vsync = true;
 
+    bool                    m_asyncPresent = false;
+
     void PresentImage(UINT SyncInterval);
 
+    void SynchronizePresent();
+
     void FlushImmediateContext();
     
     void RecreateSwapChain(
@@ -141,6 +145,8 @@ namespace dxvk {
     
     void CreateHud();
 
+    void InitOptions();
+
     void InitRenderState();
 
     void InitSamplers();