android: Switch to C++

apps/openmw/CMakeLists.txt

@@ -9,7 +9,7 @@ set(GAME
 
 if (ANDROID)
     set(GAME ${GAME} android_commandLine.cpp)
-    set(GAME ${GAME} android_main.c)
+    set(GAME ${GAME} android_main.cpp)
 endif()
 
 set(GAME_HEADER

apps/openmw/android_main.cpp

@@ -18,35 +18,35 @@ extern const char **argvData;
 void releaseArgv();
 
 
-int Java_org_libsdl_app_SDLActivity_getMouseX(JNIEnv *env, jclass cls, jobject obj) {
+extern "C" int Java_org_libsdl_app_SDLActivity_getMouseX(JNIEnv *env, jclass cls, jobject obj) {
     int ret = 0;
-    SDL_GetMouseState(&ret, NULL);
+    SDL_GetMouseState(&ret, nullptr);
     return ret;
 }
 
 
-int Java_org_libsdl_app_SDLActivity_getMouseY(JNIEnv *env, jclass cls, jobject obj) {
+extern "C" int Java_org_libsdl_app_SDLActivity_getMouseY(JNIEnv *env, jclass cls, jobject obj) {
     int ret = 0;
-    SDL_GetMouseState(NULL, &ret);
+    SDL_GetMouseState(nullptr, &ret);
     return ret;
 }
 
-int Java_org_libsdl_app_SDLActivity_isMouseShown(JNIEnv *env, jclass cls, jobject obj) {
+extern "C" int Java_org_libsdl_app_SDLActivity_isMouseShown(JNIEnv *env, jclass cls, jobject obj) {
     return SDL_ShowCursor(SDL_QUERY);
 }
 
 extern SDL_Window *Android_Window;
-int SDL_SendMouseMotion(SDL_Window * window, int mouseID, int relative, int x, int y);
-void Java_org_libsdl_app_SDLActivity_sendRelativeMouseMotion(JNIEnv *env, jclass cls, int x, int y) {
+extern "C" int SDL_SendMouseMotion(SDL_Window * window, int mouseID, int relative, int x, int y);
+extern "C" void Java_org_libsdl_app_SDLActivity_sendRelativeMouseMotion(JNIEnv *env, jclass cls, int x, int y) {
     SDL_SendMouseMotion(Android_Window, 0, 1, x, y);
 }
 
-int SDL_SendMouseButton(SDL_Window * window, int mouseID, Uint8 state, Uint8 button);
-void Java_org_libsdl_app_SDLActivity_sendMouseButton(JNIEnv *env, jclass cls, int state, int button) {
+extern "C" int SDL_SendMouseButton(SDL_Window * window, int mouseID, Uint8 state, Uint8 button);
+extern "C" void Java_org_libsdl_app_SDLActivity_sendMouseButton(JNIEnv *env, jclass cls, int state, int button) {
     SDL_SendMouseButton(Android_Window, 0, state, button);
 }
 
-int Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject obj) {
+extern "C" int Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject obj) {
     setenv("OPENMW_DECOMPRESS_TEXTURES", "1", 1);
 
     // On Android, we use a virtual controller with guid="Virtual"