[PATCH v2 5/6] dxgi: Implement d3d12_swapchain_GetMaximumFrameLatency.

[Philip Rebohle]

Signed-off-by: Philip Rebohle 
---
 dlls/dxgi/swapchain.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/dlls/dxgi/swapchain.c b/dlls/dxgi/swapchain.c
index 7b8f6c7523..7d15b4d48d 100644
--- a/dlls/dxgi/swapchain.c
+++ b/dlls/dxgi/swapchain.c
@@ -2629,9 +2629,18 @@ static HRESULT STDMETHODCALLTYPE d3d12_swapchain_SetMaximumFrameLatency(IDXGISwa

static HRESULT STDMETHODCALLTYPE d3d12_swapchain_GetMaximumFrameLatency(IDXGISwapChain3 *iface, UINT *max_latency)
 {
-    FIXME("iface %p, max_latency %p stub!\n", iface, max_latency);
+    struct d3d12_swapchain *swapchain = d3d12_swapchain_from_IDXGISwapChain3(iface);

-    return E_NOTIMPL;
+    TRACE("iface %p, max_latency %p.\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;
+    }
+
+    *max_latency = swapchain->frame_latency;
+    return S_OK;
 }

static HANDLE STDMETHODCALLTYPE d3d12_swapchain_GetFrameLatencyWaitableObject(IDXGISwapChain3 *iface)