Add love.mouse.getGlobalPosition. Useful for custom window dragging.

src/modules/mouse/wrap_Mouse.cpp

@@ -100,13 +100,17 @@ int w_isCursorSupported(lua_State *L)
 
 int w_getX(lua_State *L)
 {
-	lua_pushnumber(L, instance()->getX());
+	double x, y;
+	instance()->getPosition(x, y);
+	lua_pushnumber(L, x);
 	return 1;
 }
 
 int w_getY(lua_State *L)
 {
-	lua_pushnumber(L, instance()->getY());
+	double x, y;
+	instance()->getPosition(x, y);
+	lua_pushnumber(L, y);
 	return 1;
 }
 
@@ -121,15 +125,19 @@ int w_getPosition(lua_State *L)
 
 int w_setX(lua_State *L)
 {
-	double x = luaL_checknumber(L, 1);
-	instance()->setX(x);
+	double x, y;
+	instance()->getPosition(x, y);
+	x = luaL_checknumber(L, 1);
+	instance()->setPosition(x, y);
 	return 0;
 }
 
 int w_setY(lua_State *L)
 {
-	double y = luaL_checknumber(L, 1);
-	instance()->setY(y);
+	double x, y;
+	instance()->getPosition(x, y);
+	y = luaL_checknumber(L, 1);
+	instance()->setPosition(x, y);
 	return 0;
 }
 
@@ -141,6 +149,17 @@ int w_setPosition(lua_State *L)
 	return 0;
 }
 
+int w_getGlobalPosition(lua_State *L)
+{
+	double x, y;
+	int displayindex;
+	instance()->getGlobalPosition(x, y, displayindex);
+	lua_pushnumber(L, x);
+	lua_pushnumber(L, y);
+	lua_pushinteger(L, displayindex + 1);
+	return 3;
+}
+
 int w_isDown(lua_State *L)
 {
 	bool istable = lua_istable(L, 1);
@@ -220,6 +239,7 @@ static const luaL_Reg functions[] =
 	{ "setX", w_setX },
 	{ "setY", w_setY },
 	{ "setPosition", w_setPosition },
+	{ "getGlobalPosition", w_getGlobalPosition },
 	{ "isDown", w_isDown },
 	{ "setVisible", w_setVisible },
 	{ "isVisible", w_isVisible },