[D3D12] Add xenia-ui-window-d3d12-demo

src/xenia/ui/d3d12/d3d12_window_demo.cc

@@ -0,0 +1,29 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <string>
+#include <vector>
+
+#include "xenia/base/main.h"
+#include "xenia/ui/d3d12/d3d12_provider.h"
+#include "xenia/ui/window.h"
+
+namespace xe {
+namespace ui {
+
+int window_demo_main(const std::vector<std::string>& args);
+
+std::unique_ptr<GraphicsProvider> CreateDemoGraphicsProvider(Window* window) {
+  return xe::ui::d3d12::D3D12Provider::Create(window);
+}
+
+}  // namespace ui
+}  // namespace xe
+
+DEFINE_ENTRY_POINT("xenia-ui-window-d3d12-demo", xe::ui::window_demo_main, "");