[PATCH v3 2/6] dxgi: Signal frame latency event on present as necessary.

[Philip Rebohle]

Signed-off-by: Philip Rebohle 
---
v2: Do not manually reset the event.
v3: FIXME -> ERR

dlls/dxgi/swapchain.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/dlls/dxgi/swapchain.c b/dlls/dxgi/swapchain.c
index 58353ec1b7..bab3a7157e 100644
--- a/dlls/dxgi/swapchain.c
+++ b/dlls/dxgi/swapchain.c
@@ -1097,6 +1097,9 @@ struct d3d12_swapchain

ID3D12Fence *frame_latency_fence;
     HANDLE frame_latency_event;
+
+    uint64_t frame_number;
+    uint32_t frame_latency;
 };

static DXGI_FORMAT dxgi_format_from_vk_format(VkFormat vk_format)
@@ -2166,6 +2169,25 @@ static HRESULT d3d12_swapchain_present(struct d3d12_swapchain *swapchain,
         return hresult_from_vk_result(vr);
     }

+    if (swapchain->desc.Flags & DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT)
+    {
+        ++swapchain->frame_number;
+
+        if (FAILED(hr = ID3D12CommandQueue_Signal(swapchain->command_queue,
+                swapchain->frame_latency_fence, swapchain->frame_number)))
+        {
+            ERR("Failed to signal frame latency fence, hr %#x.\n", hr);
+            return hr;
+        }
+
+        if (FAILED(hr = ID3D12Fence_SetEventOnCompletion(swapchain->frame_latency_fence,
+                swapchain->frame_number - swapchain->frame_latency, swapchain->frame_latency_event)))
+        {
+            ERR("Failed to enqueue frame latency event, hr %#x.\n", hr);
+            return hr;
+        }
+    }
+
     swapchain->current_buffer_index = (swapchain->current_buffer_index + 1) % swapchain->desc.BufferCount;
     vr = d3d12_swapchain_acquire_next_back_buffer(swapchain);
     if (vr == VK_ERROR_OUT_OF_DATE_KHR)
@@ -2994,6 +3016,9 @@ static HRESULT d3d12_swapchain_init(struct d3d12_swapchain *swapchain, IWineDXGI

if (swapchain_desc->Flags & DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT)
     {
+        swapchain->frame_number = DXGI_MAX_SWAP_CHAIN_BUFFERS;
+        swapchain->frame_latency = 1;
+
         if (FAILED(hr = ID3D12Device_CreateFence(device, DXGI_MAX_SWAP_CHAIN_BUFFERS,
                 0, &IID_ID3D12Fence, (void **)&swapchain->frame_latency_fence)))
         {