[PATCH 4/6] dxgi: Implement d3d12_swapchain_SetMaximumFrameLatency.

[Philip Rebohle]

Signed-off-by: Philip Rebohle <philip.rebohle at tu-dortmund.de>
---
 dlls/dxgi/swapchain.c | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/dlls/dxgi/swapchain.c b/dlls/dxgi/swapchain.c
index 1c7cf5c537..1411ede376 100644
--- a/dlls/dxgi/swapchain.c
+++ b/dlls/dxgi/swapchain.c
@@ -2618,9 +2618,41 @@ static HRESULT STDMETHODCALLTYPE d3d12_swapchain_GetSourceSize(IDXGISwapChain3 *
 
 static HRESULT STDMETHODCALLTYPE d3d12_swapchain_SetMaximumFrameLatency(IDXGISwapChain3 *iface, UINT max_latency)
 {
-    FIXME("iface %p, max_latency %u stub!\n", iface, max_latency);
+    struct d3d12_swapchain *swapchain = d3d12_swapchain_from_IDXGISwapChain3(iface);
+    HRESULT hr;
 
-    return E_NOTIMPL;
+    TRACE("iface %p, max_latency %u.\n", iface, max_latency);
+
+    if (!(swapchain->desc.Flags & DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT))
+    {
+        FIXME("DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT not set for swap chain %p.\n", iface);
+        return DXGI_ERROR_INVALID_CALL;
+    }
+
+    if (!max_latency || max_latency > DXGI_MAX_SWAP_CHAIN_BUFFERS)
+    {
+        FIXME("Invalid maximum frame latency %u.\n", max_latency);
+        return DXGI_ERROR_INVALID_CALL;
+    }
+
+    if (WaitForSingleObject(swapchain->frame_latency_event, INFINITE))
+    {
+        ERR("Failed to wait for frame latency event, error %u.\n", GetLastError());
+        return E_FAIL;
+    }
+
+    if (max_latency < swapchain->frame_latency)
+        ResetEvent(swapchain->frame_latency_event);
+
+    if (FAILED(hr = ID3D12Fence_SetEventOnCompletion(swapchain->frame_latency_fence,
+            swapchain->frame_number - max_latency, swapchain->frame_latency_event)))
+    {
+        ERR("Failed to enqueue frame latency event, hr %#x.\n", hr);
+        return hr;
+    }
+
+    swapchain->frame_latency = max_latency;
+    return S_OK;
 }
 
 static HRESULT STDMETHODCALLTYPE d3d12_swapchain_GetMaximumFrameLatency(IDXGISwapChain3 *iface, UINT *max_latency)
-- 
2.26.0