d3d9/tests: Use a separate device for depth_buffer_test().

dlls/d3d9/tests/visual.c

@@ -11736,7 +11736,7 @@ done:
     DestroyWindow(window);
 }
 
-static void depth_buffer_test(IDirect3DDevice9 *device)
+static void depth_buffer_test(void)
 {
     static const struct vertex quad1[] =
     {
@@ -11768,11 +11768,25 @@ static void depth_buffer_test(IDirect3DDevice9 *device)
     };
 
     IDirect3DSurface9 *backbuffer, *rt1, *rt2, *rt3;
+    IDirect3DDevice9 *device;
     unsigned int i, j;
     D3DVIEWPORT9 vp;
+    IDirect3D9 *d3d;
     D3DCOLOR color;
+    ULONG refcount;
+    HWND window;
     HRESULT hr;
 
+    window = CreateWindowA("static", "d3d9_test", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+            0, 0, 640, 480, NULL, NULL, NULL, NULL);
+    d3d = Direct3DCreate9(D3D_SDK_VERSION);
+    ok(!!d3d, "Failed to create a D3D object.\n");
+    if (!(device = create_device(d3d, window, window, TRUE)))
+    {
+        skip("Failed to create a D3D device, skipping tests.\n");
+        goto done;
+    }
+
     vp.X = 0;
     vp.Y = 0;
     vp.Width = 640;
@@ -11864,6 +11878,11 @@ static void depth_buffer_test(IDirect3DDevice9 *device)
     IDirect3DSurface9_Release(rt3);
     IDirect3DSurface9_Release(rt2);
     IDirect3DSurface9_Release(rt1);
+    refcount = IDirect3DDevice9_Release(device);
+    ok(!refcount, "Device has %u references left.\n", refcount);
+done:
+    IDirect3D9_Release(d3d);
+    DestroyWindow(window);
 }
 
 /* Test that partial depth copies work the way they're supposed to. The clear
@@ -15669,11 +15688,11 @@ START_TEST(visual)
     texop_range_test(device_ptr);
     alphareplicate_test(device_ptr);
     dp3_alpha_test(device_ptr);
-    depth_buffer_test(device_ptr);
 
     cleanup_device(device_ptr);
     device_ptr = NULL;
 
+    depth_buffer_test();
     depth_buffer2_test();
     depth_blit_test();
     intz_test();