添加模式选择开始菜单并修复中文界面乱码

src/source/TetrisLogic.cpp

@@ -11,6 +11,9 @@ bool targetFlag = false;
 int workRegion[20][10] = { 0 };
 Point point = { 0, 0 };
 Point target = { 0, 0 };
+MenuState menuState = { 0, 2 };
+int currentScreen = SCREEN_MENU;
+int currentMode = MODE_CLASSIC;
 
 int bricks[7][4][4][4] =
 {
@@ -516,3 +519,23 @@ void Restart()
 
     ComputeTarget();
 }
+
+void StartGameWithMode(int mode)
+{
+    currentMode = mode;
+    currentScreen = SCREEN_PLAYING;
+    Restart();
+}
+
+void ReturnToMainMenu()
+{
+    currentScreen = SCREEN_MENU;
+    suspendFlag = false;
+    gameOverFlag = false;
+    menuState.optionCount = 2;
+
+    if (menuState.selectedIndex < 0 || menuState.selectedIndex >= menuState.optionCount)
+    {
+        menuState.selectedIndex = 0;
+    }
+}