dxgi: Create frame latency events for d3d12 swapchains if requested.

dlls/dxgi/swapchain.c

@@ -1094,6 +1094,9 @@ struct d3d12_swapchain
     IDXGIOutput *target;
     DXGI_SWAP_CHAIN_DESC1 desc;
     DXGI_SWAP_CHAIN_FULLSCREEN_DESC fullscreen_desc;
+
+    ID3D12Fence *frame_latency_fence;
+    HANDLE frame_latency_event;
 };
 
 static DXGI_FORMAT dxgi_format_from_vk_format(VkFormat vk_format)
@@ -1887,6 +1890,12 @@ static void d3d12_swapchain_destroy(struct d3d12_swapchain *swapchain)
 
     d3d12_swapchain_destroy_buffers(swapchain, TRUE);
 
+    if (swapchain->frame_latency_event)
+        CloseHandle(swapchain->frame_latency_event);
+
+    if (swapchain->frame_latency_fence)
+        ID3D12Fence_Release(swapchain->frame_latency_fence);
+
     if (swapchain->command_queue)
         ID3D12CommandQueue_Release(swapchain->command_queue);
 
@@ -2906,7 +2915,7 @@ static HRESULT d3d12_swapchain_init(struct d3d12_swapchain *swapchain, IWineDXGI
         FIXME("Ignoring scaling %#x.\n", swapchain_desc->Scaling);
     if (swapchain_desc->AlphaMode && swapchain_desc->AlphaMode != DXGI_ALPHA_MODE_IGNORE)
         FIXME("Ignoring alpha mode %#x.\n", swapchain_desc->AlphaMode);
-    if (swapchain_desc->Flags)
+    if (swapchain_desc->Flags & ~(DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT))
         FIXME("Ignoring swapchain flags %#x.\n", swapchain_desc->Flags);
 
     if (fullscreen_desc->RefreshRate.Numerator || fullscreen_desc->RefreshRate.Denominator)
@@ -2983,6 +2992,25 @@ static HRESULT d3d12_swapchain_init(struct d3d12_swapchain *swapchain, IWineDXGI
         return hresult_from_vk_result(vr);
     }
 
+    if (swapchain_desc->Flags & DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT)
+    {
+        if (FAILED(hr = ID3D12Device_CreateFence(device, DXGI_MAX_SWAP_CHAIN_BUFFERS,
+                0, &IID_ID3D12Fence, (void **)&swapchain->frame_latency_fence)))
+        {
+            WARN("Failed to create frame latency fence, hr %#x.\n", hr);
+            d3d12_swapchain_destroy(swapchain);
+            return hr;
+        }
+
+        if (!(swapchain->frame_latency_event = CreateEventW(NULL, FALSE, TRUE, NULL)))
+        {
+            hr = HRESULT_FROM_WIN32(GetLastError());
+            WARN("Failed to create frame latency event, hr %#x.\n", hr);
+            d3d12_swapchain_destroy(swapchain);
+            return hr;
+        }
+    }
+
     IWineDXGIFactory_AddRef(swapchain->factory = factory);
 
     return S_OK;