developing wp7 apps using xna

8/3/2019 Developing WP7 apps using XNA

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http://blogs.msdn.com/glengordon


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Windows Phone will extend theXbox LIVE brand beyond the

console for the first timeWindows Phone is the first steptowards our vision of aubiquitous gaming service

Differentiates your title fromthe rest

Gamertag

Friends

Achievements

MerchandisingPremium Placement


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Without Xbox LIVE You can still write

andpublish games forWindows Phone

Create great games for marketplace

http://developer.windowsphone.com

Were interested in your great games!

[email protected]

To use the greatfeatures of Xbox LIVE

Find a publisher!Lots to choose from!


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Consistent sets of hardware capabilitiesdefined by Microsoft

ResolutionTouch InputCPU / GPURAM

Hardware keyboard is optional


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Modern XAML/event-driven application UIframework

Rapid creation of visuallyrich apps

HTML/Javascript

Mature, robust, widelydeployed technology

High performance gameframework

Rapid creation of multi-screen2D and 3D games

Rich content pipeline

Mature, robust, widelyadopted technologyspanning Xbox,Windows, and Zune

GAMES(and applications)

APPLICATIONS(and games)


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Powerful

Productive

Portable


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Makes game development easier

XNA Framework provides robust APIs for games

C#, .NET and Visual Studio tooling

Solutions for game content processing

Not an engine solution

CreatingGames


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XNA Game Studio 4.0

Develop for

Windows

Phone 7

Simplifiedgraphics APIs

Visual Studio2010

integration

Enhanced

audio

support

New

configurable

effects


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Uses the .NET platform

Windows Phone 7

Managed code platform, no unsafe code

XNA Game Studio 4.0 is C# exclusive

800+ managed code

games on XBLA/XBLIG

Windows gamespublished

through portals

.NET/XNA is usedfor games today!

[email protected]


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Frameworksdesigned

for performance

Frameworksdesigned

for performance

Frameworksdesigned

for performance

Frameworksdesigned

for performance

XNA Frameworkdesigned for

gaming scenarios

Commitment tofuture

of managed codeNo unnecessary

garbage generation

Math libraries optimized

Efficient APIs with tunedtransitions to native code

Three + years of profilingand investment

Weve built for performanceon Windows Phone 7


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Productive development with .NET and C#

High performance IDE

Intellisense makes coding faster

Integrated build/deploy/debug experience

MSBuild engine for build automation


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Simplify Your Content Usage


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The XNA Framework Game Loop is layered ontop of the Silverlight Application object onWindows Phone 7

Provides the bulk of integration of APIs

Most of the XNA Framework can be accessed from

Silverlight applicationsIncluding Gamer Services (Xbox LIVE)

In this release some sharing/composition is notcomplete

Scenes using GraphicsDevice from XNA Frameworkand UIElements from Silverlight

Youll want to choose the technology that worksbest for your scenarios


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GraphicsUI control heavy consider Silverlight

Desire vector graphics in XAML

MediaRich video support in application

ToolingIf you use Microsoft Blend in yourpipeline


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GraphicsUsing 3D graphics

Sprite heavy 2D applications should considerthe XNA Framework Game Loop

Simulation/DrawingThose who prefer a traditional update/draw/present frame loop

Tooling

Those who want to use the XNA FrameworkContent Pipeline graphics types


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XNA Framework Game Loop Example

System integration withWindows Phone 7 best practices

Translated to existingXNA Framework concepts

Traditional update/draw/present frame loop

Core programming model

consistent with previous releasesChanges implemented yield betterpower performance on devices

protectedoverridevoid Update(GameTime gameTime){

// Allows the game to exit

if

(GamePad.GetState(PlayerIndex.One).Buttons.Back ==

ButtonState.Pressed)

this.Exit();

// TODO: Add your update logic here

base.Update(gameTime);

}

protectedoverridevoid Draw(GameTime gameTime)

{

GraphicsDevice.Clear(Color.CornflowerBlue);

// TODO: Add your drawing code here

base.Draw(gameTime);

}

Start simple and customize!


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Evolution of our existing immediate mode rendering API

Simplifies for resource and render state management

Feature segmentation between Reach/HiDef profiles

Rendering primitives 2D and 3D


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New configurable effectclasses on all platforms

BasicEffect

SkinnedEffect

EnvironmentMapEffect

DualTextureEffect

AlphaTestEffect

Custom effects not availableon Windows Phone 7


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Scaler

Write your game without worrying about native resolution or orientationAutomatic rotation between portrait and landscapeTouch automatically supports both scale and orientation changes

Scaler can drastically improve performance

Trade off performance for crispness and shade fewer pixels800x480 = 384,000 pixels, 480x320 = 153,600 pixels

Upsample an arbitrary back buffer to native device resolution

Far higher quality than bilinear filteringAllows for easier porting from other platforms

Scaling/Rotation comes for free from Hardware


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Audio Capture Example

publicvoid EventDrivenCapture()

{

mic = Microphone.Default;

buffer = new byte[mic.GetSampleSizeInBytes(mic.BufferDuration)];

mic.BufferReady += newEventHandler(OnBufferReady);

DynamicPlayback = newDynamicSoundEffectInstance (mic.SampleRate,AudioChannels.Mono);

}

publicvoid OnBufferReady(object sender, EventArgs args)

{

// Get the latest captured audio.

int duration = mic.GetData(buffer);

// Do some post-capture processing and playback.

MakeMeSoundLikeARobot(buffer, duration);DynamicPlayback.SubmitBuffer(buffer);

}

Audio Capture andPlayback

Simple API to play back WAV data

Modify pitch, volume, pan audio

Ability to play synthesized/buffered audio

Serialize captured data

Provides more control over System.Mediatypes on Windows Phone 7

Microphone/BluetoothSupport

Playback through headset

Capture through mic or headset

Audio Playback Example

// Load a sound effect from a raw stream

SoundEffecteffect1 =

SoundEffect.FromStream(GetStreamFromTheWeb( "http://url.wav"));

effect1.Play();

// Create dynamic audio on the fly

byte[] fluteSound = GetFluteNote();

effect2 = newSoundEffect(fluteSound, SampleRate,

AudioChannels.Stereo);

SoundEffectInstanceinstance = effect2.CreateInstance();

instance.Pan = -1; instance.Pitch = 1.5f;

instance.Play();


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URI Song Playback Example

Retrieve Image Data

Music Enumeration and Playback// Constructs a song from a URIUri mediaStreamUri = new

Uri("http://song.asx");

Song streamedSong =

Song.FromUri("Song",

mediaStreamUri);

// Play the song

MediaPlayer.Play(streamedSong);

MediaLibrarymedia = newMediaLibrary();

// Get the JPEG image dataStreammyJpegImage =

ReadAndModifyPicture(somePicture);

// Save texture to Media Library

media.SavePicture("Awesome", myJpegImage);

Picture Enumeration and Playback

Video Playback

Control and enumerate usersmedia within a game

Ability to play songs from URI/URL(i.e. music app)

Supports photopicking/editing/publishing

Uses standard video player API

Show/Hide controls


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Touch Input Handling

Cross Platform Input API

Touch API

Xbox 360 Controllers(Xbox/Windows)

Keyboard(Xbox/Windows/Windows Phone 7)

Available across platforms for portability(fewer #ifdefs)

Multipoint on Windows Phone 7and Windows

Orientation and resolution aware

Developer can override

var touchCollection = TouchPanel.GetState();

//...

foreach (var touchLocation in touchCollection)

{

if (touchLocation.State ==

TouchLocationState.Released)

{

//...}

}


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Accelerometer Example

VibrationExampleLeverage Platform Featureson Windows Phone 7

Location

Accelerometer

Vibration

Accelerometer accelerometer = new

Accelerometer();

accelerometer.ReadingChanged +=

AccelerometerReadingChanged;

accelerometer.Start();

VibrateController rumbler;

rumbler.Start(TimeSpan.FromSeconds(2));


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Windows Phone 7 OS

Xbox LIVE

Gamer Services

HTTP

Invites

ProfileAchieve-

ments

Leader-

boards

Trial

Mode

Push

Avatars


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Read a Players Profile

// Profile access

SignedInGamer gamer =Gamer.SignedInGamers[0];

// Get the player's GamerTag to display

string gamerTag = gamer.Gamertag;

// A SignedInGamer has a ProfileGamerProfile profile = gamer.GetProfile();

// Get the player's current GamerScore

int gamerScore = profile.GamerScore;

// get the gamer picture (PNG file stream)Stream gamerPictureStream = profile.GamerPicture;


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Award an Achievement

// Award an achievementSignedInGamer gamer = Gamer.SignedInGamers[0];

gamer.AwardAchievement("Attended TechEd 2010");

Read Achievements

// Get achievements

AchievementCollection achievements =gamer.GetAchievements();

// walk through achievements

foreach (Achievement ain achievements)

{

string name = a.Name;

string description = a.Description;

bool earned = a.IsEarned;

int score = a.GamerScore;

Stream icon = a.Picture;

}

Real achieventments Real gamerscore Up to 20 awards,

200G total Dead simple API,

deep game design


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Write to a Leaderboard

// Create leaderboard identity with game mode 1

LeaderboardIdentity id =

LeaderboardIdentity.Create(LeaderboardKey.BestScoreLifeTime, 1);

// get the leaderboard writer from the signed in gamer

LeaderboardWriterwriter = gamer.LeaderboardWriter;

// get the leaderboard entry for the identity

LeaderboardEntry entry = writer.GetLeaderboard(id);

// write new leaderboard data

entry.Rating = 1000;

entry.columns.SetValue("Outcome",LeaderboardOutcome.Win);

Read From a Leaderboard

// Read from leaderboard with page size of 10

LeaderboardReader reader =LeaderboardReader.Read(id, gamer, 10);

foreach (LeaderboardEntryein reader.Entries)

{

// score or time, as defined by identity. Rating determines

rank.

long rating = e.Rating;

// read additional column data

long wins = e.Columns.GetValueInt64("Wins");

Stream blob = e.Columns.GetValueStream("Blob");

}

reader.PageDown();

Compete withFriends

Score- or Time-based

Fixed columns

10k blob data

Pivot on gamer


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Trial Mode

Guide.SimulateTrialMode =true;

// if we are in trial mode, show a marketplace offering

if(Guide.IsTrialMode)

{

PlayerIndex playerIndex =Gamer.SignedInGamers[0].PlayerIndex;

Guide.ShowMarketplace(playerIndex);

}

Simple check Simulate for testing

Send user to your Marketplace offer


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http://avatar.xboxlive.com/avatar/Major%20Nelson/avatar-body.png

Currently supported through web service only

Static pose rendered on LIVE back-end

Download as a stream


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Game invites are handled through email Guide.ShowGameInvite() invokes platform picker UI

Player chooses game invite recipients

Friends see invitations in their games hub


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XNA Framework designedto be cross platform

Smaller time investmentand target more sockets

Project synchronization

between platforms


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HiDef

Reach Designed for compatibility across screens/devicesThis profile includes Windows Phone 7

Platform showcase features

Xbox 360/Windows Only


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SummaryPowerful

Productive

Portable

Great managed code games, working today

Windows Phone provides a powerful platform for gaming

Focus on being a game developer

Great tools make you more productive

Target more platforms easily

Focus on your game differences, not the technology


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Call to ActionDownload the Windows Phone Developer Tools

http://developer.windowsphone.com

Create awesome games!


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Additional Resources

Hundreds of samples

Lots of MVPs and experts tohelp you get started

XNA Creators Club @http://creators.xna.com

Team Blog @http://blogs.msdn.com/xna/

Shawn Hargreaves @http://blogs.msdn.com/shawnhar/

(Great Tech Info!)

Email:[email protected]

On the web:http://developer.windowsphone.com

Peer Support @http://forums.xna.com

Blogs Contact Microsoft
http://creators.xna.com/http://blogs.msdn.com/xna/http://blogs.msdn.com/shawnhar/mailto:[email protected]://developer.windowsphone.com/http://forums.xna.com/http://forums.xna.com/http://developer.windowsphone.com/mailto:[email protected]://blogs.msdn.com/shawnhar/http://blogs.msdn.com/xna/http://creators.xna.com/


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