[Base/UI] Android globals initialization + WindowedAppContext parts

src/xenia/base/main_android.h

@@ -0,0 +1,40 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2021 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_BASE_MAIN_ANDROID_H_
+#define XENIA_BASE_MAIN_ANDROID_H_
+
+#include <cstdint>
+
+#include "xenia/base/platform.h"
+
+namespace xe {
+
+// In activities, these functions must be called in onCreate and onDestroy.
+//
+// Multiple components may run in the same process, and they will be
+// instantiated in the main thread, which is, for regular applications (the
+// system application exception doesn't apply to Xenia), the UI thread.
+//
+// For this reason, it's okay to call these functions multiple times if
+// different Xenia windowed applications run in one process - there is call
+// counting internally.
+//
+// In standalone console apps built with $(BUILD_EXECUTABLE), these functions
+// must be called in `main`.
+void InitializeAndroidAppFromMainThread(int32_t api_level);
+void ShutdownAndroidAppFromMainThread();
+
+// May be the minimum supported level if the initialization was done without a
+// configuration.
+int32_t GetAndroidApiLevel();
+
+}  // namespace xe
+
+#endif  // XENIA_BASE_MAIN_ANDROID_H_