Real life XNA

Real lifeJohan Lindfors

windows phone for games• impressive performance• sensors and touch• potentially xbox-live• ads and trials

kinectimals

harvest

implode

doodle fit

ilomilo

other favorites

xna in 1 minute• a comprehensive framework for games• integrated management of content• games with 2d and ”sprites”• games with 3d and ”meshes”• shared features for pc, wp, xbox

initialize update render

managing content• content pipeline• import common files• leverage compile time• optimized binary format• extensible

first some 2d• x and y (and z)• spriteBatch• sprites/sprite sheets• blending

and then some 3d• x, y and z• camera is described with matrices • view • projection• world matrix transforms objects relatively • movement (translation) • rotation • size (scale)

effects - shaders• configurable • basic • skinned • environmentMap • dualTexture • alphaTest

”hardware scaler”• 800x480 = 384 000 pixels• 600x360 = 216 000 pixels (56%)• 400x240 = 96 000 pixels (25%) graphics.PreferredBackBufferHeight = 800; graphics.PreferredBackBufferWidth = 480;

performance tips• manage the stack and heap • reference types live on the _______! • value types live on the _______!• pass large structures by reference Matrix a, b, c; c = Matrix.Multiply(a, b); // copies 192 bytes! Matrix.Multiply(ref a, ref b, out c);• don’t foreach or linq (know code cost)

performance tips• gc is ”simpler” than on pc • allocate objects early, reuse• GC.Collect() can be your friend! • after load, while paused• cpu or gpu based? • you can go up to 60 fps (60 hz)

sound and music• soundEffect• load as content• wp handles 64 simultaneously• possible to change • pitch • volume • 3d location

orientation graphics.SupportedOrientations = DisplayOrientation.Portrait | DisplayOrientation.LandscapeLeft | DisplayOrientation.LandscapeRight;• default is ”LandscapeLeft”

orientation Window.OrientationChanged += (s, e) => { switch (Window.CurrentOrientation) { case DisplayOrientation.Portrait: graphics.PreferredBackBufferHeight = 800; graphics.PreferredBackBufferWidth = 480; break; default: graphics.PreferredBackBufferHeight = 480; graphics.PreferredBackBufferWidth = 800; break; } graphics.ApplyChanges(); };

accelerometer using Microsoft.Devices.Sensors;• measures acceleration in X, Y and Z• values returned between -1 and +1• event based• read values in event, store for usage

start accelerometer Accelerometer accel; private void startAccelerometer() { accel = new Accelerometer(); accel.ReadingChanged += new EventHandler <AccelerometerReadingEventArgs> (accel_ReadingChanged); accel.Start(); }

read the accelerometer Vector3 accelReading; void accel_ReadingChanged(object sender, AccelerometerReadingEventArgs e) { lock (this) { accelReading.X = (float)e.X; accelReading.Y = (float)e.Y; accelReading.Z = (float)e.Z; } }

touch• windows phone handles 4 touch points • all points have unique id • pressed | moved | released TouchCollection touches; protected override void Update(GameTime gt) { touches = TouchPanel.GetState(); ... }

gestures• wp can also handle gestures • tap | drag | hold | flick | pinch ... TouchPanel.EnabledGestures = GestureType.Flick; while (TouchPanel.IsGestureAvailable) { GestureSample g = TouchPanel.ReadGesture(); if (g.GestureType == GestureType.Flick) { ... } }

network• http, rest, xml, sockets... void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) { if (e.Error == null) { mapImage = Texture2D.FromStream( graphics.GraphicsDevice, e.Result); } }

xbox live• avatars and “trials” available for all• developers with agreements • profile • invites • achievements • leaderboard • gamerServices• contact: wpgames@microsoft.com

trial mode #if DEBUG Guide.SimulateTrialMode = true; #endif bool isTrial = Guide.IsTrialMode; ... Guide.ShowMarketplace(PlayerIndex.One);• call to IsTrialMode takes 60 ms, cache!• be creative in feature set• trial or free light?

ads• instead of user paying for app• not for swedish apps yet* using Microsoft.Advertising.Mobile.Xna; ... AdManager adManager; Ad bannerAd; *not from Microsoft that is, there are options

marketplace• local structure• test kit in VS2010• updates• auto-publish

protect yourself• ready for obfuscation?public void d(bp.b A_0){ this.l = A_0; this.i = new List<string>(); this.i.Add(am.a().e("SK_NO")); this.i.Add(am.a().e("SK_YES")); this.g = bo.a; SignedInGamer.SignedIn += new EventHandler<SignedInEventArgs>(this.d);}

news in mango• silverlight + xna• fast application switching• profiling• combined api for movement

tripeaks solitaire• fabrication games• true 3D• all code in objective-c

-(BOOL) animate{ if([self animation] == nil) { [self draw]; return NO; } else { BOOL animationDone = [[self animation] animate]; [self draw]; if (animationDone) { x += [[self animation] currentX]; y += [[self animation] currentY]; z += [[self animation] currentZ]; rotation += [[self animation] currentRotation]; [animations removeObjectAtIndex:0]; } return animationDone; }}

public bool Animate(){ if (this.Animation == null) { this.Draw(); return false; } else { bool animationDone = this.Animation.Animate(); this.Draw(); if (animationDone) { x += this.Animation.CurrentX; y += this.Animation.CurrentY; z += this.Animation.CurrentZ; rotation += this.Animation.CurrentRotation; animations.RemoveAt(0); } return animationDone; }}

public bool Animate(GraphicsDevice graphics, BasicEffect effect){ if (this.Animation == null) { this.Draw(graphics, effect); return false; } else { bool animationDone = this.Animation.Animate(); this.Draw(graphics, effect); if (animationDone) { x += this.Animation.CurrentX; y += this.Animation.CurrentY; z += this.Animation.CurrentZ; rotation += this.Animation.CurrentRotation; animations.RemoveAt(0); } return animationDone; }}

future of xna?• silverlight 5.0 • subset of XNA • focused on business apps• windows 8 • leverages directx 11 • likely to attract commercial studios

johan.lindfors@coderox.se

resources• create.msdn.com• jodegreef.wordpress.com - angry pigs• www.xnaresources.com• http://msdn.microsoft.com/en- us/library/bb417503(XNAGameStudio.41).aspx• programmeramera.se• www.coderox.se

Real life XNA

by Johan Lindfors

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Real life XNA Presentation Transcript

Real life XNA

by Johan Lindfors

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Real life XNA Presentation Transcript

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