abi.exdream.com - Benjamin Nitschke's Blog - Racing Game

All XNA Games converted to XNA 2.0 from Rocket Commander to the Racing Game.

Benjamin Nitschke (abi) — Mon, 11 Feb 2008 23:48:36 GMT

Even when I did not post much last week I was very busy converting all the old XNA 1.0 games to XNA 2.0. I did not only convert all projects (8 games in total, see below), but I also tested them extensively on Windows XP, Vista (32 and 64 bit) and the Xbox 360. Additionally a lot of usability improvements have been implemented in the games, for example the XNA Shooter is now much easier (was almost impossible to even reach 50% of the level) and a lot more fun due better balancing. The XNA Racing Game has now a better physic engine and will not longer let the car fly out of the track or leave ground in loopings. Due the better input control and fixed physics the cars drive now much faster and it is more challenging to complete the tracks in shorter time frames.

Games in this article:

Chapter1Game
Xna Pong
Xna Breakout
Xna Tetris
Rocket Commander Xna
Xna Shooter
Xna Racing Game
Dungeon Quest GDC

Please read my previous post about Converting XNA 1.0 games to XNA 2.0 for all technical tips. All the games can also be found on http://XnaProjects.net, but I will also make them easier accessible on this blog soon, which has an update overdue (need to clean up the left and right sides) ^^

Thanks to the great VS2005 support of XNA 2.0 all games have now just one single solution file, which works on Windows and the Xbox 360. The projects can be opened in XNA Game Studio 2.0 and Visual Studio 2005 without having to convert the files over and over again like in the past. The Icons for all games were also improved. Lets take a look at the Icons (.ico files) on Windows:

For the Xbox 360 game icons the .png files (usually named GameThumbnail.png) are used:

Ok, let's take a look at the games and what has changed for them. Most games are pretty much the same as for XNA 1.0, but a lot of smaller bugs were fixed and they have been tested more.

Chapter1Game: This application is not really a game, but a test project to check out if XNA 2.0 is properly working on both Windows and the Xbox 360. It is from the first chapter of my book "Professional XNA Game Programming". BTW: The second edition of the book is coming out soon, there are 3 more chapters about Multiplayer game programming and a cool new role playing game.
- Game Installer: Chapter1GameSetup.exe (210 KB)
- Source Code and Game Content: Chapter1GameSourceCode.zip (57 KB)
- Screenshot:
Xna Pong: Xna Pong is a simple clone of the favorite pong game from 1978. It is just a few hunderd lines of code and should be very easy to understand.

This game is from the book "Professional XNA Game Programming" by Benjamin Nitschke. For more information read chapter 2. (2008-02-10: Now updated to XNA 2.0)
- Game Installer: XnaPongSetup.exe (309 KB)
- Source Code and Game Content: XnaPongSourceCode.zip (258 KB)
- Screenshot:
Xna Breakout: XNA Breakout is a simple Breakout/Arcanoid game based on the XNA Pong game from the previous chapter.

It is fully described and covered in Chapter 3 of my book "Professional XNA Game Programming". The code is quite short and should be easy to understand. (2008-02-10: Now updated to XNA 2.0)
- Game Installer: XnaBreakoutSetup.exe (383 KB)
- Source Code and Game Content: XnaBreakoutSourceCode.zip (316 KB)
- Screenshot:
Xna Tetris: This is a simple, but highly addictive Tetris game. You can control the blocks with your cursor keys, aswd or a game pad and the game works both on Windows and the Xbox 360. Reaching levels above 5 is really hard. My highest level was 9, try to reach more :) (2008-02-10: Now updated to XNA 2.0)

This game introduces the helper classes (chapter 4 of my book) and makes more use of unit testing and game components in XNA.
- Game Installer: XnaTetrisSetup.exe (310 KB)
- Source Code and Game Content: XnaTetrisSourceCode.zip (277 KB)
- Screenshot:
Rocket Commander Xna: XNA port of the famous Rocket Commander game. The game principle stayed the same, but the controls were a little bit simplified to make it more fun on the Xbox 360.

If you want to learn more about the Rocket Commander game, check out its official website www.RocketCommander.com and check out the Video Tutorials on Coding4Fun by MSDN. (2008-02-10: Now updated to XNA 2.0, also supports very big resolutions now and runs faster on the Xbox 360)
- Game Installer: RocketCommanderXnaSetup.exe (16.5 MB)
- Source Code and Game Content: RocketCommanderXnaSourceCode.zip (52.8 MB)
- Screenshot:
Xna Shooter: Shoot'n'up game specifically created for my book "Professional XNA Game Programming". It features full HDTV support, runs on Windows and the Xbox 360, 5 weapon types, 5 enemy types, a powerful ship and some power ups. It is quite fun to play and it gets harder and harder the longer you play. Based partly on the Rocket Commander XNA engine, but also features lots of new effects and shaders. (2008-02-10: Now updated to XNA 2.0, also much easier and balanced)

This game and the racing game are the most improved. The game works now much better in high resolutions and on the Xbox 360. But most importantly the game is now much easier, balanced and more fun. Additionally a level percentage is now visible on the bottom and more EMP bombs can be picked up to make it easier at the end of the level.
- Game Installer: XnaShooterSetup.exe (14.9 MB)
- Source Code and Game Content: XnaShooterSourceCode.zip (32.2 MB)
- Screenshot:
Xna Racing Game: XNA Racing Game Starter Kit I wrote for http://creators.xna.com. More information and more downloads can be found on http://XnaRacingGame.com. It runs best on the Xbox 360 in HDTV (1920x1200), but it also runs fine on the PC. (2008-02-10: Now updated to XNA 2.0, driving also improved a lot, better tested on Xbox 360 and fixed some issues).

Following things were improved: Shadow mapping on very big resolutions works now (crashed before), more options for lower quality settings, fixed physics, car now always stays on the road, fixed loopings, cars are much faster now, winning conditions work better now, and fixed several other bugs.
- Game Installer: XnaRacingGameSetup.exe (40.2 MB)
- Source Code and Game Content: XnaRacingGameSourceCode.zip (95.4 MB)
- Screenshot:
Dungeon Quest GDC: And finally the Dungeon Quest XNA Game, which was developed in just 4 days on the GDC 2007 at the XNA Contest. Dungeon Quest GDC is a relatively complex 3D role playing game (at least for just 4 days of work). An early version even supported coop multiplayer on the Xbox 360 via splitscreen. The game was developed by Benjamin Nitschke (abi.exDream.com) and Christoph Rienaecker (WAII). (2008-02-10: Now updated to XNA 2.0). This is NOT the full Dungeon Quest game (see www.DungeonQuestGame.com for that), this is just the GDC version.

Please note that the level was reduced to allow loading on the Xbox 360 (which otherwise crashes with an OutOfMemoryException), the game is not fully playable, only the first part is implemented. You can also press F2 to toggle the Options menu and some minor bugs were fixed. But this game is no longer supported, I will not improve it anymore! Please check out the new Dungeon Quest game from www.DungeonQuestGame.com, which is coming in a month or so.
- Game Installer: DungeonQuestGDCSetup.exe (25.6 MB)
- Source Code and Game Content: DungeonQuestGDCSourceCode.zip (67.2 MB)
- Screenshot:

Have fun with all the games :)

Converting XNA 1.0 Projects to XNA 2.0

Benjamin Nitschke (abi) — Fri, 01 Feb 2008 00:32:32 GMT

When I wrote this (a little bit each day while working on converting the old XNA projects) I was very aware about the disappointment of my blog readers about the fact that I did not blog much in the last couple of months, especially on XNA. I not only got a lot of emails about that, but also quite a lot of questions, especially since XNA 2.0 was released. I made yet another promise to myself to change that and finally blog more, maybe not only when something very interesting pops up, but instead about the everyday issues I run into.

Some Notes about XNA 2.0: More solid, lots of little new features, networking, while it may not be a very complete solution, at least it is now possible on the Xbox 360 and overall I have the feeling even more people are interested in XNA than a year ago. Plus the guys at the XNA Team doing a great job and are constantly improving the XNA Creators Club website for us game programmers and artists :)

Several people had problems using the old XNA 1.0 code of my games and make them work with XNA 2.0, so here is a little help in case you want to convert XNA 1.0 projects to XNA 2.0. You will also notice this if you go to any XNA community site as most samples will still be in XNA 1.0 and not work out of the box in XNA 2.0, and many of those will probably never be changed since they are not longer actively being developed.

For most games almost all of the code can stay unchanged, you just have to poke at a few things that have changed in the framework or were improved. More information about converting projects can be found here (read this first, this article is based on the stuff there). You can also use the Cross-Platform Game Project Converter from XNA 2.0 to add a Xbox 360 project to your existing Windows XNA project without having to create a separate project (it is helpful, but I used pretty much the same trick for all of my XNA 1.0 games anyway).

Let's go through the steps:

Either use the XNA project conversion utility (can be found on the XNA Creators Club website) or just create a new XNA 2.0 project in VS 2005.
If you created a new project, drag all source code files into the project and seperate the content files out and put them all in the existing Content directory (only there the content pipeline is activated). If you just converted a project and the content files did not move, move them yourself to the content directory. Gladly all my projects with more than 5 content files had a special content directory anyway, so no need to change anything content-wise for them. If you don't want some of the files to be compiled to .xnb files, you have to change the build action from "compile" to "content" (and then use the "copy to output directory" switch) or to "none" if you want them to be ignored like for .wav files, which are automatically processed by the .xct (XACT) file for you.
Find the line content = new ContentManager(Services); and replace it with Content.RootDirectory = "Content";. If you do that, get rid of the content manager in your game class since you can now use the build-in Content property to access the underlying Game content manager. In case you don't want to do that or if you need an extra variable, replace the above line with content = new ContentManager(Services, "Content");. Both ways will make sure all the content is now loaded from the content directory instead from the main directory of the application. In more complex XNA games you can also change the BaseGameDirectory to the content directory, but then you would also have to move all other resource files to this directory (config files, save games, levels, etc.). It is usually a good idea to separate the compiled (.xnb) content from the content the user can change (config, levels, etc.), so I suggest just redirecting the content directory of the content manager.
Replace the LoadGraphicsContent(bool) method with LoadContent, remove all the if (loadAllContent) commands (was never false anyway, just let the content of the if loop stay) and also remove the call to base.LoadGraphicsContent(bool) (does not do anything like all the Load or Unload methods in the XNA Game class, they are just empty virtual methods). You can also ignore this and the next step since it will only generate depreciated warnings, but I suggest cleaning up your source code whenever an opportunity like this presents itself. I also added some missing region blocks to the code and some comments here and there were they were missing.
Finally delete the UnloadGraphicsContent method unless it did anything beside base.Unload and base.UnloadGraphicsContent. In my XNA games the UnloadGraphicsContent usually looked like this and can be safely removed now (at least if nothing else is in there):

/// <summary>
/// Unload graphic content if the device gets lost.
/// </summary>
/// <param name="unloadAllContent">Unload everything?</param>
protected override void UnloadGraphicsContent(bool unloadAllContent)
{
if (unloadAllContent == true)
content.Unload();

base.UnloadGraphicsContent(unloadAllContent);
} // UnloadGraphicsContent(loadAllContent)

In case you load sound and music via the AudioEngine, you have to change the directory to the content directory too, which will not be done automatically for you since you load the .xct file directly in the AudioEngine constructor. Basically just exchange the following code:

audioEngine = new AudioEngine("YourSound.xgs");
waveBank = new WaveBank(audioEngine, "Wave Bank.xwb");
soundBank = new SoundBank(audioEngine, "Sound Bank.xsb");

with:

audioEngine = new AudioEngine("Content\\YourSound.xgs");
waveBank = new WaveBank(audioEngine, "Content\\Wave Bank.xwb");
soundBank = new SoundBank(audioEngine, "Content\\Sound Bank.xsb");
In case you have used the StorageDevice and specifically the ShowStorageDeviceGuide helper method, it is gone now in XNA 2.0. I had it in some helper classes, but never actually used it. In case you want to show a save game dialog (or some network game select dialog for example), please follow the XNA 2.0 help instructions to do this asynchronously now.
In case you use any ResourceUsage enum, replace it with TextureUsage instead or remove it if the issue is not texture related. You can also safely remove any ResourceManagementMode.Automatic parameters, which are not longer supported. Everything is now automatic anyway. Just if you have been using ResourceUsage.RenderTarget you will need to change the Texture2D class to a ResolveTexture2D class in order to archive the same behaviour as before. Some calls to the device (e.g. ResolveBackBuffer) have also changed and require a ResolveTexture2D now. You may also want to check if you have any manual texture management or disposing, which you can remove or simplify.
For simpler games (2D) games you should be done now. More complex games using render targets and other features that have changed in XNA 2.0 will require some more changes, but after you have done them once (or know where to change what) this is also a quick process.

RocketCommanderXna

XnaShooter

XnaRacingGame

First of all make sure the old XNA 1.1 code gets compileable by going though the changes mentioned above (e.g. replacing ResourceUsage with TextureUsage or BufferUsage) and removing everything that does not exist anymore (like ResourceManagementMode.Automatic). If a method is non-existent in XNA 2.0 like ResolveRenderTarget, comment it out and remember where it happened.
You might go through other issues, but you have to come back to the RenderTarget issue. This took the most time in the converting process for me (probably half of all my issues come by something related to changes with RenderTargets in XNA 2.0). For that reason always make sure that rendering to textures still works while you make changing. I always used the TestCreateRenderToTexture unit test inside the RenderToTexture class to figure things out.
Additionally to making some changes in the BaseGame class (loading content via LoadContent, using the base.Content instead of creating a new content manager, etc.) I also removed all the RenderTarget helper methods and fields from the BaseGame class (SetRenderTarget, ResetRenderTarget, etc.) and moved them into the RenderToTexture class. While this makes the code more clean and restructured by making a few more fields private, if you do not call the new InitializeDepthBufferFormatAndMultisampling of the RenderToTexture class the calls to SetRenderTarget and ResetRenderTarget will not work correctly and will not restore the default depth buffer (which has to be remembered first). If you get the following exception it means the DepthBuffer Device.DepthStencilBuffer was set to null, but is obviously still used. In order to fix that make sure the remDepthBuffer variable is set to a correct value in the InitializeDepthBufferFormatAndMultisampling method!

An error has occurred during the Clear operation while trying to clear the depth or stencil buffer, no DepthStencilBuffer surface exists.
System.InvalidOperationException: An error has occurred during the Clear operation while trying to clear the depth or stencil buffer, no DepthStencilBuffer surface exists.
at Microsoft.Xna.Framework.Graphics.GraphicsDevice.Clear(ClearOptions options, Color color, Single depth, Int32 stencil, Rectangle[] regions)
at Microsoft.Xna.Framework.Graphics.GraphicsDevice.Clear(Color color)

4. Even if you have now done everything, the app may still crash when you are trying to clear a render target (which usually happens at the start of each pre or post screen shader). The reason for the following error is the multi sampling format, which might be set to the background buffer, but not to the render targets:

The active render target and depth stencil surface must have the same pixel size and multisampling type.
System.InvalidOperationException: The active render target and depth stencil surface must have the same pixel size and multisampling type.
at Microsoft.Xna.Framework.Graphics.GraphicsDevice.VerifyDepthRenderTargetCompat()
at Microsoft.Xna.Framework.Graphics.GraphicsDevice.Clear(ClearOptions options, Color color, Single depth, Int32 stencil, Rectangle[] regions)

In order to get rid of this error without changing the RenderToTexture class a lot, you can just comment out the line where multi sampling is activated in BaseGame:

//this.graphics.PreferMultiSampling = true;

http://XnaProjects.net

CoDe Magazine: Microsoft XNA: Ready for Prime Time?

Benjamin Nitschke (abi) — Thu, 09 Aug 2007 18:43:04 GMT

Microsoft XNA: Ready for Prime Time?

is the name of the Article of the CoDe Magazine. It is very well written and a really long (9 pages) read with tons of information in it.
Together with 6 other guys I was interviewed about my experiences with XNA and the development process of the
XNA Racing Game and Dungeon Quest, which are 2 of the best looking XNA games so far :)

Check it out, good work Nick Landry.

Silverlight and I spotted A Racing Game Mod: Cyber Car

Benjamin Nitschke (abi) — Tue, 08 May 2007 03:55:20 GMT

I heard about all the Silverlight fuss from the MIX2007 conference last week, but I did not have time to check it out with all the stress and projects I'm currently involved in. I already use VS Orcas for a while (see post from last month) and I played around with WPF in the past (formerly Avalon, now Silverlight, which is still in beta, but will be released this summer finally), but I did not find anything compelling for a game programmer since we use DirectX or XNA anyway. But with the ability to build websites with Silverlight and still allowing the .NET framework to exist in that environment while simplifying the development process and getting away from building static html like pages with some dynamic features (ajax or not, it is still somewhat static and hard to do), Silverlight gets much sexier than just WPF on a windows app by itself.

Why is Silverlight cool? It is .NET, it runs on Firefox, IE, Safari, Mac, etc. it is just 2 MB download, it is amazingly fast, it has many cool new features, it allows many windows-only apps to be developed for the browser in a more natural way, it will be pushed like crazy and a lot of people will have it till the end of this year, there are already some cool tools out there including the Expression toolkit and Visual Studio Orcas, and probably a lot of other reasons you can checkout yourself!

Maybe it is even possible to interop with some DirectX or XNA stuff somehow. I have no idea if this is possible at all or if there are security issues or this kind of functionality is not possible at all, but instead of waiting for another week until I find a few minutes to test this out, why not announce it here first that this would be cool and maybe someone else can test it for me :)

Even for just doing websites, Silverlight will definitely become a BIG competitor to Flash based websites, developing in .NET will be a lot easier than working with Flash/Actionscript/whatever and I would bet that there are more VB/C# developers that can now do some great websites without having to learn much while creating Flash sites or even doing ASP.NET (with or without Ajax) development is much harder and less compelling for certain kinds of applications. Great examples are the FOX Movies site and some widgets on MSDN or some early test controls from Telerik.

BTW: Archor wrote me an email about his Cyber Car XNA game he wanted to submit to the XnaProjects.Net site I made last week. This is actually a Racing Game Mod, I first guessed he used the simple racing game version, but this one is based on the full racing game from the XNA creators website. Pretty cool style in my opinion. Thanks Archor!

http://xbox360.archor.com/

My XNA book is out and XnaProjects.Net launches

Benjamin Nitschke (abi) — Fri, 04 May 2007 13:29:43 GMT

Yes. My XNA book is finally out and some people even got an early version last week. There is also some discussion going on in the XNA Forums and on the official Wrox forum for the book.

The coolest thing yesterday that my book was on Rank #16 for Computer/Technical books on Amazon.com and on Rank 500 something for all books. Quite impressive if you ask me, hopefully it will continue to stay high and make me filthy rich .. just kidding.

Yesterday I wanted to put all the samples from the book on my blog, but it is already way to overloaded here with screenshots and games, adding another 10 games will not make anything better. Instead I had a crazy idea to create a XNA Community site in one day. It is called XnaProjects.Net. The idea is for everyone to submit their games and links. News are grabbed with Google Blog Search and more features will come in July 2007 when I got more than 5 minutes time in a row.

Anyway, check out this great new website, submit your games and links and check out whats already submitted by me (10 Games so far, yes, thats a lot of XNA games I did in the past few months):

XNA Pong
XNA Breakout
XNA Tetris
Rocket Commander XNA
XNA Shooter
XNA Racing Game
SimpleRacingGame
SpeedyRacer
Dungeon Quest
Skinning with Collada Models in XNA

You can find source code and game installers for all of these games, including some nice screenshots and a YouTube video for each of them on the XnaProjects.Net website. Check it out:

XnaRacingGame.com goes online

Benjamin Nitschke (abi) — Fri, 27 Apr 2007 19:24:34 GMT

I have put together a little website for the XNA Racing Game Starter Kit released yesterday on
http://creators.xna.com/Education/StarterKits.aspx

Here you go: http://www.XnaRacingGame.com

A little rant about the XNA Racing Game Starter Kit download: The download file is 130 MB in size and will eat up almost 290 MB of your hard disk space extracted. It is also only available in the .vsi format and can't be used in anything but XNA Game Studio Express or Visual C# Express. The main reason for this incredible size is the Textures directory, with uses mainly uncompressed .TGA files. The original Racing Game version had only about 50-70 MB in total with DDS textures and the Simple Racing Game version from my book is even smaller (30 MB I think, but a lot of content is not in there, its a also a much smaller and simplified project).

Microsoft has also removed all credits of me, all readmes, all unit tests, most comments, some screens like the credit screens. It's a little bit sad for me because all references to me or my website were removed and I'm not even mentioned on the starter kit download page :( I think the starter kit is now much harder to understand because there are no unit tests in the code to test anything out. Anyway, I just hope the XNA Racing Game Starter Kit is useful for you guys, it helps XNA and everyone wins :-)

Update 2007-05-01: I'm now mentioned on http://creators.xna.com and happy :)

XNA Racing Game downloads now available on creators.xna.com

Benjamin Nitschke (abi) — Fri, 27 Apr 2007 09:28:15 GMT

Nice one. The Racing Game Starter kit for XNA Game Studio Express I made last year is now available on
http://creators.xna.com/Education/StarterKits.aspx

More information will be available shortly on the in-official website for the Racing Game (link to the xna creators club, screenshots, mod support and forums later):
http://www.XnaRacingGame.com

Enjoy the Racing Game ;-)

My book Professional XNA Game Programming for the Xbox 360 and Windows seems to be out too. I have not received a copy myself yet, but I received some emails about other guys already holding it in their hands ^^ If you try to download the source code for the book from the Wrox website and encounter problems, please be aware that the download link is currently pointing to an older version, which still has some issues. I will try to sort that out as soon as possible. The official release date was 11 May, 2007, but Amazon says it is already available, while their own release date is stated as 30 April, 2007. Confusing, isn't it?

If you find any issues with the starter kit or the book download please write me a message so I can fix it as soon as possible. Many thanks to ZMan (Andy Dunn) for an early bug report.