[PATCH] d3d9/tests: Add a basic test for default value and limits of max frame latency parameter.

[Nikolay Sivov]

Signed-off-by: Nikolay Sivov 
---
 dlls/d3d9/tests/d3d9ex.c | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/dlls/d3d9/tests/d3d9ex.c b/dlls/d3d9/tests/d3d9ex.c
index 77e09c3cee..7c36e6ee64 100644
--- a/dlls/d3d9/tests/d3d9ex.c
+++ b/dlls/d3d9/tests/d3d9ex.c
@@ -4043,6 +4043,55 @@ static void test_device_caps(void)
     DestroyWindow(window);
 }

+static void test_frame_latency(void)
+{
+    IDirect3DDevice9Ex *device;
+    ULONG refcount;
+    UINT latency;
+    HWND window;
+    HRESULT hr;
+
+    window = create_window();
+    if (!(device = create_device(window, NULL)))
+    {
+        skip("Failed to create a D3D device.\n");
+        DestroyWindow(window);
+        return;
+    }
+
+    hr = IDirect3DDevice9Ex_GetMaximumFrameLatency(device, &latency);
+todo_wine {
+    ok(SUCCEEDED(hr), "Failed to get max frame latency, hr %#x.\n", hr);
+    ok(latency == 3, "Unexpected default max frame latency %u.\n", latency);
+}
+    hr = IDirect3DDevice9Ex_SetMaximumFrameLatency(device, 1);
+    ok(SUCCEEDED(hr), "Failed to set max frame latency, hr %#x.\n", hr);
+
+    hr = IDirect3DDevice9Ex_GetMaximumFrameLatency(device, &latency);
+todo_wine {
+    ok(SUCCEEDED(hr), "Failed to get max frame latency, hr %#x.\n", hr);
+    ok(latency == 1, "Unexpected max frame latency %u.\n", latency);
+}
+    hr = IDirect3DDevice9Ex_SetMaximumFrameLatency(device, 0);
+    ok(SUCCEEDED(hr), "Failed to set max frame latency, hr %#x.\n", hr);
+
+    hr = IDirect3DDevice9Ex_GetMaximumFrameLatency(device, &latency);
+todo_wine {
+    ok(SUCCEEDED(hr), "Failed to get max frame latency, hr %#x.\n", hr);
+    ok(latency == 3, "Unexpected default max frame latency %u.\n", latency);
+}
+    hr = IDirect3DDevice9Ex_SetMaximumFrameLatency(device, 30);
+    ok(SUCCEEDED(hr), "Failed to set max frame latency, hr %#x.\n", hr);
+
+    hr = IDirect3DDevice9Ex_SetMaximumFrameLatency(device, 31);
+todo_wine
+    ok(hr == D3DERR_INVALIDCALL, "Unexpected hr %#x.\n", hr);
+
+    refcount = IDirect3DDevice9Ex_Release(device);
+    ok(!refcount, "Device has %u references left.\n", refcount);
+    DestroyWindow(window);
+}
+
 START_TEST(d3d9ex)
 {
     DEVMODEW current_mode;
@@ -4093,4 +4142,5 @@ START_TEST(d3d9ex)
     test_backbuffer_resize();
     test_format_unknown();
     test_device_caps();
+    test_frame_latency();
 }