draw to a RenderTarget & scale that to screen

GitOrigin-RevId: b4635c5fab

Jumpy.Shared/JumpyGame.cs

@@ -7,6 +7,7 @@ using System.Collections.Generic;
 namespace Jumpy {
   public class JumpyGame : Game {
     GraphicsDeviceManager graphics;
+    RenderTarget2D renderTarget;
     SpriteBatch spriteBatch;
     SpriteFont font;
     KeyboardInput keyboardInput = new KeyboardInput();
@@ -27,6 +28,10 @@ namespace Jumpy {
       display.Initialize(Window, graphics);
       display.SetFullScreen(fullScreen);
 
+      renderTarget = new RenderTarget2D(
+        GraphicsDevice, 320, 180, false /* mipmap */,
+        GraphicsDevice.PresentationParameters.BackBufferFormat, DepthFormat.Depth24);
+
       base.Initialize();
     }
 
@@ -34,7 +39,7 @@ namespace Jumpy {
     protected override void LoadContent() {
       spriteBatch = new SpriteBatch(GraphicsDevice);
       font = Content.Load<SpriteFont>("font");
-      player = new Player(Content.Load<Texture2D>("player"));
+      player = new Player(Content.Load<Texture2D>("player_1x"));
 
     }
 
@@ -66,13 +71,25 @@ namespace Jumpy {
 
     // Called when the game should draw itself.
     protected override void Draw(GameTime gameTime) {
+      // Draw scene to RenderTarget.
+      GraphicsDevice.SetRenderTarget(renderTarget);
+      // GraphicsDevice.DepthStencilState = new DepthStencilState() { DepthBufferEnable = true };
       GraphicsDevice.Clear(Color.CornflowerBlue);
-
       spriteBatch.Begin();
       player.Draw(gameTime, spriteBatch);
       spriteBatch.End();
 
-      // spriteBatch.DrawString(font, "hello world", new Vector2(100, 100), Color.Black);
+      // Draw RenderTarget to screen.
+      GraphicsDevice.SetRenderTarget(null);
+      GraphicsDevice.Clear(Color.Black);
+      spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque,
+            SamplerState.PointClamp, DepthStencilState.Default,
+            RasterizerState.CullNone);
+      Rectangle drawRect = new Rectangle(
+        0, 0, GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height);
+      spriteBatch.Draw(renderTarget, drawRect, Color.White);
+      // spriteBatch.DrawString(font, "hello world", new Vector2(10, 10), Color.Black);
+      spriteBatch.End();
 
       base.Draw(gameTime);
     }

Jumpy.Shared/Player.cs

@@ -9,16 +9,16 @@ namespace Jumpy {
     enum Pose { Walking, Standing, Crouching, Stretching, SwordSwing, Jumping };
     enum AirState { Jumping, Ground };
 
-    private const int spriteSize = 144;
-    private const int spriteWidth = 20;
-    private const int moveSpeed = 600;
-    private const int jumpSpeed = 1800;
-    private const int gravity = 6000;
+    private const int spriteSize = 48;
+    private const int spriteWidth = 8;
+    private const int moveSpeed = 200;
+    private const int jumpSpeed = 600;
+    private const int gravity = 2000;
     private Texture2D texture;
 
     // TODO: stop assuming 1920x1080.
-    private const int groundLevel = 1080 - spriteSize / 2 - 200;
-    private Vector2 position = new Vector2(200, groundLevel);
+    private const int groundLevel = 180 - spriteSize / 2 - 10;
+    private Point position = new Point(200, groundLevel);
     private Facing facing = Facing.Right;
     private Pose pose = Pose.Standing;
     private AirState airState = AirState.Ground;
@@ -48,11 +48,11 @@ namespace Jumpy {
       if (gamePad.DPad.Left == ButtonState.Pressed || leftStick.X < -0.5) {
         facing = Facing.Left;
         pose = Pose.Walking;
-        position.X -= moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
+        position.X -= (int) (moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds);
       } else if (gamePad.DPad.Right == ButtonState.Pressed || leftStick.X > 0.5) {
         facing = Facing.Right;
         pose = Pose.Walking;
-        position.X += moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;
+        position.X += (int) (moveSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds);
       } else if (gamePad.DPad.Down == ButtonState.Pressed || leftStick.Y < -0.5) {
         pose = Pose.Crouching;
       } else if (gamePad.DPad.Up == ButtonState.Pressed || leftStick.Y > 0.5) {
@@ -70,8 +70,8 @@ namespace Jumpy {
       }
 
       if (airState == AirState.Jumping) {
-        position.Y += (float)(ySpeed * gameTime.ElapsedGameTime.TotalSeconds);
-        ySpeed += gravity * (float)gameTime.ElapsedGameTime.TotalSeconds;
+        position.Y += (int) (ySpeed * gameTime.ElapsedGameTime.TotalSeconds);
+        ySpeed += gravity * (float) gameTime.ElapsedGameTime.TotalSeconds;
         if (position.Y > groundLevel) {
           position.Y = groundLevel;
           ySpeed = 0;
@@ -82,7 +82,7 @@ namespace Jumpy {
         pose = Pose.Jumping;
       }
    
-      position.X = Math.Min(Math.Max(position.X, 0 + spriteWidth), 1920 - spriteWidth);
+      position.X = (int) Math.Min(Math.Max(position.X, 0 + spriteWidth), 320 - spriteWidth);
     }
 
     private Point spritePosition(Pose pose, GameTime time) {
@@ -126,7 +126,8 @@ namespace Jumpy {
       Vector2 spriteCenter = new Vector2(spriteSize / 2, spriteSize / 2);
       SpriteEffects effect = facing == Facing.Right ?
         SpriteEffects.FlipHorizontally : SpriteEffects.None;
-      spriteBatch.Draw(texture, position, textureSource, Color.White, 0f, spriteCenter,
+      Vector2 drawPos = new Vector2(position.X, position.Y);
+      spriteBatch.Draw(texture, drawPos, textureSource, Color.White, 0f, spriteCenter,
         Vector2.One, effect, 0f);
     }
   }