How and Where to start to build a game using Qt

[Dinesh Balu]

Hi Everyone...
I wanna create a game using Qt for Symbian 60
I have some knowledge in application development in Qt
I have some questions for you ?

What is QML?What's that for?
Is QML must in game development?
Where to get OpenGL libraries for Qt C++? How to import it into project?
How to create the project for game?
How to use Accelerometer?
Can anyone list some free library packages for physics ,audio ,controls and render engine?

Please help me.... Thank you....

[Chuck Gao]

1. QML is a declarative language, just like javascript. It's more easier to create UIs than Qt C++.
2. You can use it every where, and it's also good for game development
3. I think it's depend on what kind of game you want to develop.Qt also have a OpenGL implementation, so you can use the OpenGL native APIs
4. You can find the introduction in the Help doc. Qt Assistant specially.
5. For physics engine, Box2D i think it's for you. And it also have a QML Plugin, you can check the Gitorious. For audio, you can just use Qt MultiMediaKit or QML Audio element.

[Peppy]

That was quite a quick answer Chuck ;-) :-D

[Dinesh Balu]

bq. Where to get OpenGL libraries for Qt C++? How to import it into project?
bq. I think it’s depend on what kind of game you want to develop.Qt also have a OpenGL implementation, bq. so you can use the OpenGL native APIs

You mean we can use the OpenGL libraries that we use with Visual Studio ( the dlls and headers ).

[Chuck Gao]

[quote author="Dinesh Balu" date="1305725722"]
You mean we can use the OpenGL libraries that we use with Visual Studio ( the dlls and headers ).
[/quote]

Actually, it's difference between OpenGL in Windows(which Qt use Mesa, one implementation of OpenGL standards) and OpenGL ES in Symbian.

And talking about Windows, you just need add "opengl" to .pro file, then use it with QGLWidget. And for simple OpenGL game with QML in both Windows and Symbian, you can try "Qt3D" at "Qt3D Gitorious":git://gitorious.org/qt-labs/qt3d.git.

[ZapB]

Qt uses whatever OpenGL implementation is on your system. Qt does not provide it's own OpenGL implementation at all. Commonly, OpenGL implementations are provided by yoru graphics card vendor and are installed along with the other driver components.

If the vendor does not provide a hardware accelerated implementation of OpenGL then it is possible to use a completle ysoftware based version such as mesa although this will of course not be as fast.

To you OpenGL with Qt take a look at the QGLWidget class.

[Dinesh Balu]

Thanks Chuck.Gao and ZapB...

I tried to run the 5 in a row game given by Qt and I'm getting this error

bq. Cannot open include file :'QGLWidget' No such file or directory

does the QtOpenGL module libraries come with the Qt SDK or we have to include like a plugin...

I'm using Nokia's Qt Creator 2.0.1 - Based on Qt 4.7.0 (32 bit)

[ZapB]

You need to add:

@
QT += opengl
@

to your .pro file and re-run qmake if you wish to use OpenGL. This tells qmake to append the necessary include and library search paths to the generated Makefiles.

I've not looked at the example to see if this does so or even needs OpenGL.

[Dinesh Balu]

Thanks ZapB... It worked.....
but it now shows multiple errors in 'gl.h'...

one that is

bq. syntax error: 'void' should be preceeded by ';'

when I checked this error... it points to this line in gl.h

bq. WINGDIAPI void APIENTRY glAccum (GLenum op, GLfloat value);

[ZapB]

Can you post the code (or point me to it) that is causing this error please? I am not familiar with the example you are talking about.

[Dinesh Balu]

I got this project from this link:
"5 in a row":http://quitcoding.com/?page=work#5inarow

get the source code tar.gz file of the title 5 in a row

[lexan]

is it easy to create a game using QT quick?

[xsacha]

It depends on the complexity of the game.
For your game, I would recommend QML. Do you need to learn Qt/C++ for your class though?

Here is a QML game that uses 'levels' so you can see how transitions work:
http://qt-apps.org/content/show.php?content=134799

[lexan]

ah. so it will all depend on the "transitions"?

I might need to learn Qt/c++ I assume

[xsacha]

By transitions I just mean how they change from one level to the other. Basically, generating each level.
That game I linked to is written in QML/Javascript rather than Qt/C++.

P.S. Did you get the email?

[lexan]

Yeah I did. Thanks :D It really helped me a lot :)