make Toasts a list & implement FPS counter as a toast

GitOrigin-RevId: bae35697a0

Shared/Debug.cs

@@ -27,13 +27,16 @@ namespace SemiColinGames {
     }
          
     public static bool Enabled;
+    // This is a LinkedList instead of a List because SetFpsText() adds to its front.
+    static LinkedList<string> toasts = new LinkedList<string>();
     static List<DebugRect> rects = new List<DebugRect>();
     static List<DebugLine> lines = new List<DebugLine>();
+
     static Texture2D whiteTexture;
-    static string toast = null;
 
-    public static void Toast(string s) {
-      toast = s;
+    public static void Initialize(GraphicsDevice graphics) {
+      whiteTexture = new Texture2D(graphics, 1, 1);
+      whiteTexture.SetData(new Color[] { Color.White });
     }
 
     public static void WriteLine(string s) {
@@ -43,17 +46,22 @@ namespace SemiColinGames {
     public static void WriteLine(string s, params object[] args) {
       System.Diagnostics.Debug.WriteLine(s, args);
     }
-    
-    public static void Initialize(GraphicsDevice graphics) {
-      whiteTexture = new Texture2D(graphics, 1, 1);
-      whiteTexture.SetData(new Color[] { Color.White });
-    }
-    
+
     public static void Clear() {
+      toasts.Clear();
       rects.Clear();
       lines.Clear();
     }
 
+    public static void AddToast(string s) {
+      toasts.AddLast(s);
+    }
+
+    // FPS text is always displayed as the first toast (if set).
+    public static void SetFpsText(string s) {
+      toasts.AddFirst(s);
+    }
+
     public static void AddRect(Rectangle rect, Color color) {
       rects.Add(new DebugRect(rect, color));
     }
@@ -62,12 +70,12 @@ namespace SemiColinGames {
       lines.Add(new DebugLine(start, end, color));
     }
 
-    public static void DrawToast(SpriteBatch spriteBatch, SpriteFont font) {
-      if (toast == null) {
-        return;
+    public static void DrawToasts(SpriteBatch spriteBatch, SpriteFont font) {
+      int y = 10;
+      foreach (var toast in toasts) {
+        spriteBatch.DrawString(font, toast, new Vector2(10, y), Color.Teal);
+        y += 30;
       }
-      spriteBatch.DrawString(font, toast, new Vector2(10, 40), Color.Teal);
-      toast = null;
     }
 
     public static void Draw(SpriteBatch spriteBatch, Camera camera) {

Shared/SneakGame.cs

@@ -93,6 +93,9 @@ namespace SemiColinGames {
       // We need to update the FPS counter in Draw() since Update() might get called more
       // frequently, especially when gameTime.IsRunningSlowly.
       fpsCounter.Update();
+      string fpsText = $"{GraphicsDevice.Viewport.Width}x{GraphicsDevice.Viewport.Height}, " +
+        $"{fpsCounter.Fps} FPS";
+      Debug.SetFpsText(fpsText);
 
       // Draw scene to RenderTarget.
       GraphicsDevice.SetRenderTarget(renderTarget);
@@ -131,10 +134,7 @@ namespace SemiColinGames {
       spriteBatch.Draw(renderTarget, drawRect, Color.White);
 
       if (Debug.Enabled) {
-        string fpsText = $"{GraphicsDevice.Viewport.Width}x{GraphicsDevice.Viewport.Height}, " +
-          $"{fpsCounter.Fps} FPS";
-        spriteBatch.DrawString(font, fpsText, new Vector2(10, 10), Color.Teal);
-        Debug.DrawToast(spriteBatch, font);
+        Debug.DrawToasts(spriteBatch, font);
       }
 
       spriteBatch.End();