improved transition system, target rendering portion tested with loading to main screen.

RhythmBullet/RhythmBullet.csproj

@@ -47,12 +47,13 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="Zer01HD\Game\Screens\Transitions\FadeInTransition.cs" />
+    <Compile Include="Zer01HD\Game\Screens\Transitions\FadeAwayTransition.cs" />
     <Compile Include="Zer01HD\Utilities\ContentSystem\NormalContentResolver.cs" />
     <Compile Include="Zer01HD\Utilities\Persistence\Preferences.cs" />
     <Compile Include="Zer01HD\Utilities\Renderer\ScaledRenderer.cs" />
     <Compile Include="Zer01HD\Utilities\UI\Interactive\BasicButton.cs" />
-    <Compile Include="Zer01HD\Utilities\UI\LoadingScreen.cs" />
+    <Compile Include="Zer01HD\Utilities\UI\ScreenSystem\ITransition.cs" />
+    <Compile Include="Zer01HD\Utilities\UI\ScreenSystem\LoadingScreen.cs" />
     <Compile Include="Zer01HD\Game\Screens\MainScreen.cs" />
     <Compile Include="Zer01HD\Utilities\UI\Modular\Module.cs" />
     <Compile Include="Zer01HD\Utilities\UI\Modular\ModuleGroup.cs" />
@@ -62,7 +63,7 @@
     <Compile Include="Zer01HD\Utilities\UI\Book\Page.cs" />
     <Compile Include="Zer01HD\Utilities\UI\Book\Book.cs" />
     <Compile Include="Zer01HD\Utilities\UI\Modular\Text.cs" />
-    <Compile Include="Zer01HD\Utilities\UI\Screen.cs" />
+    <Compile Include="Zer01HD\Utilities\UI\ScreenSystem\Screen.cs" />
     <Compile Include="Zer01HD\Utilities\ContentSystem\ContentLoad.cs" />
     <Compile Include="Zer01HD\Game\ContentResolvers\FontContentResolver.cs" />
     <Compile Include="Zer01HD\Game\ContentResolvers\ResolutionContentResolver.cs" />

RhythmBullet/RhythmBulletGame.cs

@@ -1,15 +1,13 @@
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input;
-using RhythmBullet.Zer01HD.Game;
 using RhythmBullet.Zer01HD.Game.ContentResolvers;
 using RhythmBullet.Zer01HD.Game.Preferences;
 using RhythmBullet.Zer01HD.Game.Screens;
-using RhythmBullet.Zer01HD.UI;
 using RhythmBullet.Zer01HD.Utilities;
 using RhythmBullet.Zer01HD.Utilities.ContentSystem;
 using RhythmBullet.Zer01HD.Utilities.DataTypes;
-using RhythmBullet.Zer01HD.Utilities.UI;
+using RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem;
 using System;
 using System.Diagnostics;
 
@@ -26,17 +24,16 @@ namespace RhythmBullet
 
         GraphicsDeviceManager graphics;
         SpriteBatch spriteBatch;
-        public Color BackgroundColor;
         public readonly ContentSystem Assets;
         readonly ResolutionContentResolver resolutionContentResolver;
         public PreferencesManager preferencesManager;
         private Screen previousScreen;
+        private RenderTarget2D previousScreenRenderTarget;
         private Screen currentScreen;
         private bool resizing;
         public RhythmBulletGame()
         {
             graphics = new GraphicsDeviceManager(this);
-            BackgroundColor = Color.Black;
             Content.RootDirectory = "Content";
             Assets = new ContentSystem(Content);
             resolutionContentResolver = new ResolutionContentResolver();
@@ -52,31 +49,6 @@ namespace RhythmBullet
             graphics.PreferredBackBufferHeight = resolution.Height;
         }
 
-        public Screen Screen
-        {
-            get
-            {
-                return currentScreen;
-            }
-            set
-            {
-                if (currentScreen != null)
-                {
-                    if (value.GetType() != typeof(MainScreen))
-                    {
-                        previousScreen = value;
-                    }
-                    Screen.Hide();
-                }
-                currentScreen = value;
-                if (!Screen.Initiated)
-                {
-                    Screen.Initiate(new Rectangle(0, 0, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight), graphics.GraphicsDevice);
-                }
-                Screen.Show();
-            }
-        }
-
         /// <summary>
         /// Allows the game to perform any initialization it needs to before starting to run.
         /// This is where it can query for any required services and load any non-graphic
@@ -101,7 +73,7 @@ namespace RhythmBullet
             // Create a new SpriteBatch, which can be used to draw textures.
             spriteBatch = new SpriteBatch(GraphicsDevice);
             QueueContent();
-            Screen = new LoadingScreen(Content.Load<Texture2D>("RhythmBullet"), 0.7f, new Rectangle(0, 0, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight));
+            Screen = new LoadingScreen(Content.Load<Texture2D>("RhythmBullet"), 0.7f);
         }
 
         /// <summary>
@@ -111,6 +83,7 @@ namespace RhythmBullet
         protected override void UnloadContent()
         {
             Assets.UnloadAll();
+            previousScreenRenderTarget.Dispose();
         }
 
         /// <summary>
@@ -134,23 +107,22 @@ namespace RhythmBullet
                 case ScreenState.EnterTransition:
                     if (previousScreen != null && previousScreen.UseRenderTargetForExitTransition)
                     {
-                        graphics.GraphicsDevice.SetRenderTarget(previousScreen.RenderTarget);
+                        previousScreen.UpdateTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done);
-                        previousScreen.ExitingTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done, ref BackgroundColor);
-                        previousScreen.Draw(spriteBatch);
-                        graphics.GraphicsDevice.SetRenderTarget(null);
                     }
-                    Screen.EnteringTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done, ref BackgroundColor, previousScreen?.RenderTarget);
+                    Screen.UpdateTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done);
                     break;
                 case ScreenState.ExitTransition:
-                    if (Screen.UseRenderTargetForExitTransition || Screen.ExitingTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done, ref BackgroundColor))
+                    if (Screen.UseRenderTargetForExitTransition || Screen.UpdateTransition(gameTime.ElapsedGameTime.TotalSeconds, Assets.Done))
                     {
                         if (Screen.NextScreen != null)
                         {
+                            Debug.WriteLine("Changing to the next given screen.");
                             Screen = Screen.NextScreen;
                         }
                         else
                         {
-                            Screen = previousScreen != null ? previousScreen : new MainScreen(graphics.GraphicsDevice, BackgroundColor, Assets);
+                            Debug.WriteLine("Changing to default screen.");
+                            Screen = previousScreen != null ? previousScreen : new MainScreen(graphics.GraphicsDevice, Assets);
                         }
                     }
                     break;
@@ -168,7 +140,17 @@ namespace RhythmBullet
         /// <param name="gameTime">Provides a snapshot of timing values.</param>
         protected override void Draw(GameTime gameTime)
         {
-            GraphicsDevice.Clear(BackgroundColor);
+            GraphicsDevice.Clear(Screen.BackgroundColor);
+            if (Screen.State == ScreenState.EnterTransition && previousScreen != null && previousScreen.UseRenderTargetForExitTransition)
+            {
+                graphics.GraphicsDevice.SetRenderTarget(previousScreenRenderTarget);
+                GraphicsDevice.Clear(previousScreen.BackgroundColor);
+                spriteBatch.Begin();
+                previousScreen.Draw(spriteBatch);
+                spriteBatch.End();
+                graphics.GraphicsDevice.SetRenderTarget(null);
+                Screen.UpdatePreviousScreenFrame(previousScreenRenderTarget);
+            }
             spriteBatch.Begin();
             Screen.Draw(spriteBatch);
             spriteBatch.End();
@@ -187,7 +169,9 @@ namespace RhythmBullet
             Assets.UnloadAll();
             QueueContent();
             Screen.AssetLoadStateChange(true);
-            Screen = new LoadingScreen(Content.Load<Texture2D>("loading_ring"), 0.3f, new Rectangle(0, 0, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight), true);
+            Screen = new LoadingScreen(Content.Load<Texture2D>("loading_ring"), 0.3f, true);
+            previousScreenRenderTarget.Dispose();
+            previousScreenRenderTarget = null;
         }
 
         private void PostResize()
@@ -202,5 +186,32 @@ namespace RhythmBullet
             Assets.Queue<Texture2D>("default_cover", false);
             Assets.Queue<Texture2D>("backgrounds/mainBG");
         }
+
+        public Screen Screen
+        {
+            get
+            {
+                return currentScreen;
+            }
+            set
+            {
+                previousScreen = currentScreen;
+                currentScreen = value;
+                if (!Screen.Initiated)
+                {
+                    Screen.Initiate(new Rectangle(0, 0, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight));
+                }
+                if (previousScreen != null && previousScreenRenderTarget == null && previousScreen.UseRenderTargetForExitTransition)
+                {
+                    previousScreenRenderTarget = new RenderTarget2D(graphics.GraphicsDevice, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight);
+                }
+                graphics.GraphicsDevice.SetRenderTarget(previousScreenRenderTarget);
+                graphics.GraphicsDevice.Clear(Color.Black);
+
+                Debug.WriteLine("Showing " + value.GetType().Name);
+                Debug.WriteLine("Previous screen is " + previousScreen?.GetType().Name);
+                Screen.Show();
+            }
+        }
     }
 }

RhythmBullet/Zer01HD/Game/Screens/MainScreen.cs

@@ -4,8 +4,10 @@ using RhythmBullet.Zer01HD.Game.Screens.Transitions;
 using RhythmBullet.Zer01HD.UI;
 using RhythmBullet.Zer01HD.Utilities.ContentSystem;
 using RhythmBullet.Zer01HD.Utilities.UI;
+using RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -15,31 +17,24 @@ namespace RhythmBullet.Zer01HD.Game.Screens
     class MainScreen : Screen
     {
         Texture2D background;
-        FadeInTransition fadeInTransition;
 
-        public MainScreen(GraphicsDevice graphicsDevice, Color transitionFromColor, ContentSystem assets) : base(true)
+        public MainScreen(GraphicsDevice graphicsDevice, ContentSystem assets) : base(true)
         {
-            fadeInTransition = new FadeInTransition(graphicsDevice, transitionFromColor);
+            FadeAwayTransition fadeAwayTransition = new FadeAwayTransition();
+            Transitions.Add(fadeAwayTransition);
+            graphicsDevice.Clear(Color.White);
             background = assets.Get<Texture2D>("backgrounds/mainBG");
         } 
 
         public override void Show()
         {
-            fadeInTransition.Init(ScreenSize);
             base.Show();
         }
 
         public override void Draw(SpriteBatch spriteBatch)
         {
             spriteBatch.Draw(background, ScreenSize, Color.White);
-            fadeInTransition.Draw(spriteBatch);
             base.Draw(spriteBatch);
         }
-
-        public override void EnteringTransition(double delta, bool assetsLoaded, ref Color backgroundColor, RenderTarget2D previousScreenExitFrame)
-        {
-            fadeInTransition.Fade((float)delta);
-            base.EnteringTransition(delta, assetsLoaded, ref backgroundColor, previousScreenExitFrame);
-        }
     }
 }

RhythmBullet/Zer01HD/Game/Screens/Transitions/FadeAwayTransition.cs

@@ -1,6 +1,7 @@
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using RhythmBullet.Zer01HD.Utilities.UI;
+using RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -10,29 +11,22 @@ using System.Threading.Tasks;
 
 namespace RhythmBullet.Zer01HD.Game.Screens.Transitions
 {
-    internal class FadeInTransition : IDisposable
+    internal class FadeAwayTransition : IDisposable, ITransition
     {
-        private const float RATE = 0.3f;
+        private const float TIME_REQUIRED = 2f;
-        public readonly Texture2D curtain;
+        public Texture2D curtain;
         public Rectangle curtainSize;
         private Color color;
         private float progR, progG, progB, progA;
         private float rR, rG, rB, rA;
-        internal FadeInTransition(GraphicsDevice graphicsDevice, Color startColor)
-        {
-            curtain = new Texture2D(graphicsDevice, 1, 1);
-            curtain.SetData(new[] { Color.White });
 
-            color = startColor;
+        internal FadeAwayTransition()
-        }
-
-        internal void Init(Rectangle dimensions)
         {
-            curtainSize = dimensions;
+            color = Color.White;
-            rR = (0 - color.R) / RATE;
+            rR = (0 - 254) / TIME_REQUIRED;
-            rG = (0 - color.G) / RATE;
+            rG = (0 - 254) / TIME_REQUIRED;
-            rB = (0 - color.B) / RATE;
+            rB = (0 - 254) / TIME_REQUIRED;
-            rA = (0 - color.A) / RATE;
+            rA = (0 - 254) / TIME_REQUIRED;
 
             progA = color.A;
             progR = color.R;
@@ -40,7 +34,12 @@ namespace RhythmBullet.Zer01HD.Game.Screens.Transitions
             progB = color.B;
         }
 
-        internal bool Fade(float deltaf)
+        public void InitiateTransition(Rectangle dimensions)
+        {
+            curtainSize = dimensions;
+        }
+
+        private bool Fade(float deltaf)
         {
             if (progR > 0 || progG > 0 || progB > 0)
             {
@@ -58,20 +57,32 @@ namespace RhythmBullet.Zer01HD.Game.Screens.Transitions
                 color.A = (byte)progA;
                 return false;
             }
-            return false;
+            return true;
         }
 
-        internal void Draw(SpriteBatch batch)
+        public void DrawTransition(SpriteBatch batch)
-        {
-            if (curtain != null)
         {
             batch.Draw(curtain, curtainSize, color);
         }
-        }
 
         public void Dispose()
         {
             curtain.Dispose();
         }
+
+        public bool EnteringTransition(double delta, bool assetsLoaded)
+        {
+            return Fade((float)delta);
+        }
+
+        public bool ExitingTransition(double delta, bool assetsLoaded)
+        {
+            return Fade((float)delta);
+        }
+
+        public void UpdatePreviousScreenFrame(RenderTarget2D previousScreenFrame)
+        {
+            curtain = previousScreenFrame;
+        }
     }
 }

RhythmBullet/Zer01HD/Utilities/UI/Modular/Text.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace RhythmBullet.Zer01HD.UI.Modular
 {
-    class Text : Module
+    public class Text : Module
     {
         private SpriteFont font;
         private float scale;

RhythmBullet/Zer01HD/Utilities/UI/Screen.cs

@@ -1,102 +0,0 @@
-using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Graphics;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace RhythmBullet.Zer01HD.Utilities.UI
-{
-    public enum ScreenState { EnterTransition, ExitTransition, Normal }
-
-    public class Screen
-    {
-        public bool UseRenderTargetForExitTransition;
-        private GraphicsDevice GraphicsDevice;
-        public Screen(bool useEnterTransition = false)
-        {
-            State = useEnterTransition ? ScreenState.EnterTransition : ScreenState.Normal;
-        }
-
-        public void Initiate(Rectangle screenSize, GraphicsDevice graphicsDevice)
-        {
-            Initiated = true;
-            this.ScreenSize = screenSize;
-            this.GraphicsDevice = graphicsDevice;
-            RenderTarget = new RenderTarget2D(graphicsDevice, ScreenSize.Width, ScreenSize.Height);
-        }
-
-        public virtual void Update(GameTime gameTime)
-        {
-
-        }
-
-        public virtual void Draw(SpriteBatch spriteBatch)
-        {
-
-        }
-
-        public virtual void EnteringTransition(double delta, bool assetsLoaded, ref Color backgroundColor, RenderTarget2D previousScreenExitFrame)
-        {
-
-        }
-
-        public virtual bool ExitingTransition(double delta, bool assetsLoaded, ref Color backgroundColor)
-        {
-            return true;
-        }
-
-        public virtual void Show()
-        {
-
-        }
-
-        public virtual void Hide()
-        {
-
-        }
-
-        public virtual void AssetLoadStateChange(bool state)
-        {
-
-        }
-
-        public ScreenState State { get; private set; }
-
-        public void DoneEnterTransition()
-        {
-            State = ScreenState.Normal;
-        }
-
-        public void StartExitTransition(bool UseRenderTargetForExitTransition = false)
-        {
-            this.UseRenderTargetForExitTransition = UseRenderTargetForExitTransition;
-            State = ScreenState.ExitTransition;
-        }
-
-        public Screen NextScreen
-        {
-            get; protected set;
-        }
-
-        public Rectangle ScreenSize
-        {
-            get;
-            protected set;
-            //Remember to init in init func
-        }
-
-        public RenderTarget2D RenderTarget
-        {
-            get;
-            private set;
-        }
-
-        public bool Initiated
-        {
-            get;
-            private set;
-        }
-    }
-}

RhythmBullet/Zer01HD/Utilities/UI/ScreenSystem/ITransition.cs

@@ -0,0 +1,48 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem
+{
+    public interface ITransition
+    {
+        /// <summary>
+        /// Called once when the transition is needed.
+        /// <param name="Dimensions">The dimensions of the screen.</param>
+        /// </summary>
+        void InitiateTransition(Rectangle dimensions);
+
+        /// <summary>
+        /// Called every frame if the state of the screen this transition is placed upon is in the enter transition phase.
+        /// </summary>
+        /// <param name="delta">The time passed in seconds since the last frame.</param>
+        /// <param name="assetsLoaded">Whether or not if all assets have been loaded by the <see cref="ContentSystem"/>.</param>
+        /// <param name="previousScreenExitFrame">The frame being rendered by the screen as it exits. This can be null.</param>
+        /// <returns>If this returns true, then it is considered that this transition is complete.</returns>
+        bool EnteringTransition(double delta, bool assetsLoaded);
+
+        /// <summary>
+        /// Called every frame if the state of the screen this transition is placed upon is in the exit phase.
+        /// </summary>
+        /// <param name="delta">The time passed in seconds since the last frame.</param>
+        /// <param name="assetsLoaded">Whether or not if all assets have been loaded by the <see cref="ContentSystem"/>.</param>
+        /// <returns>If this returns true, then it is considered that this transition is complete.</returns>
+        bool ExitingTransition(double delta, bool assetsLoaded);
+
+        /// <summary>
+        /// Called once every frame while transition is active. Meant to draw transition.
+        /// </summary>
+        /// <param name="spriteBatch"></param>
+        void DrawTransition(SpriteBatch spriteBatch);
+
+        /// <summary>
+        /// Updates if the previous screen uses a render target for exit transition.
+        /// </summary>
+        /// <param name="previousScreenFrame">The frame of the previous screen.</param>
+        void UpdatePreviousScreenFrame(RenderTarget2D previousScreenFrame);
+    }
+}

RhythmBullet/Zer01HD/Utilities/UI/ScreenSystem/LoadingScreen.cs

@@ -1,16 +1,14 @@
-using Microsoft.Xna.Framework;
+
+using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
-using RhythmBullet.Zer01HD.Game.Screens;
-using RhythmBullet.Zer01HD.Utilities.UI;
 using System;
-using System.Diagnostics;
 
-namespace RhythmBullet.Zer01HD.Game
+namespace RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem
 {
-    class LoadingScreen : Screen
+    class LoadingScreen : Screen, ITransition
     {
-        private const float ENTER_RATE = 2f;
+        private const float ENTER_TIME = 2f;
-        private const float EXIT_RATE = 1f;
+        private const float EXIT_TIME = 1f;
         readonly Texture2D texture;
         Color color;
         Rectangle textureBounds;
@@ -23,26 +21,40 @@ namespace RhythmBullet.Zer01HD.Game
         readonly bool rotate;
         Vector2 origin;
 
-        public LoadingScreen(Texture2D texture, float proportion, Rectangle dimensions, bool rotate = false) : base(true)
+        public LoadingScreen(Texture2D texture, float proportion, bool rotate = false) : base(true)
         {
             color = Color.White;
             this.texture = texture;
             this.proportion = proportion;
             this.rotate = rotate;
-            textureBounds.Width = (int)(dimensions.Height * proportion);
+            Transitions.Add(this);
-            textureBounds.Height = (int)(dimensions.Height * proportion);
+        }
-            textureBounds.X = (dimensions.Width) / 2;
+
-            textureBounds.Y = (dimensions.Height) / 2;
+        void DoRotate(float deltaf)
+        {
+            rotation += (2f / 3f) * (float)Math.PI * deltaf;
+            if (rotation >= 2 * Math.PI)
+            {
+                rotation = 0;
+            }
+        }
+
+        public void DrawTransition(SpriteBatch spriteBatch)
+        {
+            spriteBatch.Draw(texture, textureBounds, null, Color.White, rotation, origin, SpriteEffects.None, 0f);
+        }
+
+        public void InitiateTransition(Rectangle dimensions)
+        {
+            textureBounds.Width = (int)(ScreenSize.Height * proportion);
+            textureBounds.Height = (int)(ScreenSize.Height * proportion);
+            textureBounds.X = (ScreenSize.Width) / 2;
+            textureBounds.Y = (ScreenSize.Height) / 2;
             origin.X = texture.Width / 2;
             origin.Y = texture.Height / 2;
         }
 
-        public override void Update(GameTime gameTime)
+        public bool EnteringTransition(double delta, bool assetsLoaded)
-        {
-            base.Update(gameTime);
-        }
-
-        public override void EnteringTransition(double delta, bool assetsLoaded, ref Color BGColor, RenderTarget2D previousScreenExitFrame)
         {
             float deltaf = (float)delta;
             if (rotate)
@@ -55,9 +67,9 @@ namespace RhythmBullet.Zer01HD.Game
                 {
                     if (!recorded)
                     {
-                        rR = (Color.White.R - BGColor.R) / ENTER_RATE;
+                        rR = (Color.White.R - BackgroundColor.R) / ENTER_TIME;
-                        rG = (Color.White.G - BGColor.G) / ENTER_RATE;
+                        rG = (Color.White.G - BackgroundColor.G) / ENTER_TIME;
-                        rB = (Color.White.B - BGColor.B) / ENTER_RATE;
+                        rB = (Color.White.B - BackgroundColor.B) / ENTER_TIME;
                         recorded = true;
                     }
                     progR += rR * deltaf;
@@ -66,19 +78,20 @@ namespace RhythmBullet.Zer01HD.Game
                     progG = Math.Min(progG, 254);
                     progB += rB * deltaf;
                     progB = Math.Min(progB, 254);
-                    BGColor.R = (byte)progR;
+                    BackgroundColor.R = (byte)progR;
-                    BGColor.G = (byte)progG;
+                    BackgroundColor.G = (byte)progG;
-                    BGColor.B = (byte)progB;
+                    BackgroundColor.B = (byte)progB;
                 }
                 else
                 {
-                    DoneEnterTransition();
                     StartExitTransition(true);
+                    return true;
                 }
             }
+            return false;
         }
 
-        public override bool ExitingTransition(double delta, bool assetsLoaded, ref Color backgroundColor)
+        public bool ExitingTransition(double delta, bool assetsLoaded)
         {
             float deltaf = (float)delta;
             if (rotate)
@@ -87,7 +100,7 @@ namespace RhythmBullet.Zer01HD.Game
             }
             if (progC > 0)
             {
-                float rate = deltaf * 255 / EXIT_RATE;
+                float rate = deltaf * 255 / EXIT_TIME;
                 progC -= rate;
                 progC = Math.Max(progC, 0);
                 color.R = (byte)progC;
@@ -102,20 +115,5 @@ namespace RhythmBullet.Zer01HD.Game
             return false;
         }
 
-        void DoRotate(float deltaf)
-        {
-            rotation += (2f / 3f) * (float)Math.PI * deltaf;
-            if (rotation >= 2 * Math.PI)
-            {
-                rotation = 0;
-            }
-        }
-
-        public override void Draw(SpriteBatch spriteBatch)
-        {
-            spriteBatch.Draw(texture, textureBounds, null, color, rotation, origin, SpriteEffects.None, 0f);
-            base.Draw(spriteBatch);
-        }
-
     }
 }

RhythmBullet/Zer01HD/Utilities/UI/ScreenSystem/Screen.cs

@@ -0,0 +1,142 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RhythmBullet.Zer01HD.Utilities.UI.ScreenSystem
+{
+    public enum ScreenState { EnterTransition, ExitTransition, Normal }
+
+    public class Screen
+    {
+        public List<ITransition> Transitions;
+        public bool UseRenderTargetForExitTransition;
+        public Color BackgroundColor;
+        public Screen(bool useEnterTransition = false)
+        {
+            State = useEnterTransition ? ScreenState.EnterTransition : ScreenState.Normal;
+            Transitions = new List<ITransition>();
+        }
+
+        public void Initiate(Rectangle screenSize)
+        {
+            Initiated = true;
+            this.ScreenSize = screenSize;
+            foreach (ITransition transition in Transitions)
+            {
+                transition.InitiateTransition(screenSize);
+            }
+        }
+
+        public virtual void Update(GameTime gameTime)
+        {
+
+        }
+
+        public virtual void Draw(SpriteBatch spriteBatch)
+        {
+            foreach (ITransition transition in Transitions)
+            {
+                transition.DrawTransition(spriteBatch);
+            }
+        }
+
+        /// <summary>
+        /// Updates the transition.
+        /// </summary>
+        /// <param name="delta">Time passed since last frame in seconds.</param>
+        /// <param name="assetsLoaded">If waiting on assets.</param>
+        /// <param name="previousScreenExitFrame">The previous screen's frame. May be null.</param>
+        /// <returns>Only returns true if exit transition is complete. Returns false otherwise.</returns>
+        public bool UpdateTransition(double delta, bool assetsLoaded)
+        {
+            switch (State)
+            {
+                case ScreenState.EnterTransition:
+                    EnteringTransition(delta, assetsLoaded);
+                    break;
+                case ScreenState.ExitTransition:
+                    return ExitingTransition(delta, assetsLoaded);
+            }
+
+            return false;
+        }
+
+        private void EnteringTransition(double delta, bool assetsLoaded)
+        {
+            bool complete = true;
+            for (int transitionID = 0; transitionID < Transitions.Count; transitionID++)
+            {
+                ITransition transition = Transitions[transitionID];
+                if (!transition.EnteringTransition(delta, assetsLoaded))
+                {
+                    complete = false;
+                }
+            }
+            if (complete && State != ScreenState.ExitTransition)
+            {
+                State = ScreenState.Normal;
+            }
+        }
+
+        private bool ExitingTransition(double delta, bool assetsLoaded)
+        {
+            bool complete = true;
+            foreach (ITransition transition in Transitions)
+            {
+                if (!transition.ExitingTransition(delta, assetsLoaded))
+                {
+                    complete = false;
+                }
+
+            }
+            return complete;
+        }
+
+        public virtual void Show()
+        {
+
+        }
+
+        public virtual void Hide()
+        {
+
+        }
+
+        public virtual void AssetLoadStateChange(bool state)
+        {
+
+        }
+
+        public ScreenState State { get; private set; }
+
+        public void StartExitTransition(bool UseRenderTargetForExitTransition = false)
+        {
+            this.UseRenderTargetForExitTransition = UseRenderTargetForExitTransition;
+            State = ScreenState.ExitTransition;
+        }
+        
+        public virtual void UpdatePreviousScreenFrame(RenderTarget2D previousScreenFrame)
+        {
+            foreach (ITransition transition in Transitions)
+            {
+                transition.UpdatePreviousScreenFrame(previousScreenFrame);
+            }
+        }
+
+        public Screen NextScreen
+        { get; protected set; }
+
+        public Rectangle ScreenSize
+        { get; protected set; }
+
+        public bool Initiated
+        {
+            get;
+            private set;
+        }
+    }
+}