Fix memory leaks of graphics resources.

Make Scene & LinesOfSight dispose of the graphics resources they create.

Force GC when a new level is loaded.

GitOrigin-RevId: 0640cced784e6bf5ee15f4edce8bf11d122dac51

Shared/LinesOfSight.cs

@@ -3,7 +3,7 @@ using Microsoft.Xna.Framework.Graphics;
 using System;
 
 namespace SemiColinGames {
-  class LinesOfSight {
+  class LinesOfSight : IDisposable {
 
     const int numEdgeVertices = 60;
     // coneVertices[0] is the eye position; the rest are the edge vertices.
@@ -21,6 +21,15 @@ namespace SemiColinGames {
           graphics, typeof(int), indices.Length, BufferUsage.WriteOnly);
     }
 
+    ~LinesOfSight() {
+      Dispose();
+    }
+
+    public void Dispose() {
+      vertexBuffer.Dispose();
+      indexBuffer.Dispose();
+    }
+
     public void Update(Player player, AABB[] collisionTargets) {
       Vector2 eyePos = player.EyePosition;
       float visionRange = player.VisionRange;

Shared/Player.cs

@@ -1,5 +1,4 @@
 using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 using System;
 using System.Collections.Generic;

Shared/Scene.cs

@@ -1,9 +1,9 @@
 using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
+using System;
 
 namespace SemiColinGames {
-  class Scene {
+  class Scene : IDisposable {
     public bool Enabled = false;
 
     Color backgroundColor = Color.CornflowerBlue;
@@ -14,7 +14,6 @@ namespace SemiColinGames {
     readonly RenderTarget2D sceneTarget;
     readonly RenderTarget2D lightingTarget;
     readonly BasicEffect lightingEffect;
-
     readonly SpriteBatch spriteBatch;
 
     public Scene(GraphicsDevice graphics, Camera camera) {
@@ -37,6 +36,17 @@ namespace SemiColinGames {
       spriteBatch = new SpriteBatch(graphics);
     }
 
+    ~Scene() {
+      Dispose();
+    }
+
+    public void Dispose() {
+      sceneTarget.Dispose();
+      lightingTarget.Dispose();
+      lightingEffect.Dispose();
+      spriteBatch.Dispose();
+    }
+
     public void Draw(World world, Player player, LinesOfSight linesOfSight) {
       graphics.SetRenderTarget(null);
       graphics.Clear(backgroundColor);

Shared/SneakGame.cs

@@ -74,8 +74,12 @@ namespace SemiColinGames {
       camera = new Camera();
       player = new Player();
       world = new World(Levels.ALL_LEVELS[levelIdx % Levels.ALL_LEVELS.Length]);
+      scene?.Dispose();
       scene = new Scene(GraphicsDevice, camera);
       levelIdx++;
+
+      GC.Collect();
+      GC.WaitForPendingFinalizers();
     }
 
     // Called once per game. Unloads all game content.