Beginning in Qt with OpenGL

Dinesh Balu · wrote on 23 May 2011, 06:15

bq. As you asked in another thread(http://developer.qt.nokia.com/forums/viewthread/6068/) before, do you try other exmaples? You can just make a QGLWidget yourself, and build to see what happen with your SDK or enviorment.

Yeah , this is not the same project , I have started a fresh project myself and added basic codes to IntializeGL,ResizeGL,paintGL and to draw a triangle...

but the errors haven't changed...

bq. By the way, which platform you are working with?

I'm working in Windows Xp with Nokia's QT SDK for Nokia N97 mini

Chuck Gao · wrote on 23 May 2011, 06:35

Do you build for desktop or symbian device ? Can you send your code to me, i can try it on my computer for you. Email: chuckgao.cg@gmail.com

Dinesh Balu · wrote on 23 May 2011, 06:38

Sure,... Thank you Chuck.Gao

Chuck Gao · wrote on 23 May 2011, 06:54

[quote author="Dinesh Balu" date="1306132718"]Sure,... Thank you Chuck.Gao[/quote]

The code have some wrong syntax. right one is modified

GamePlay::InitializeGL() --> GamePlay::initializeGL() in both header and source file
glViewPort --> glViewport
draw() --> GamePlay::draw()

I can build it on both Desktop(also simulator) and Symbian device, but it'll crash some where.

Dinesh Balu · wrote on 23 May 2011, 06:59

k, I have change it as you said... but still the same errors are there...

did you get the output?

Chuck Gao · wrote on 23 May 2011, 07:05

no, it's OK for me. Maybe there have some problem with your environment or SDK, i'm not sure. You can paste the log on this thread, i think someone can resolve your problem

Dinesh Balu · wrote on 23 May 2011, 07:09

how to get the log? I couldn't copy the error, it's disabled...!
There is no log file in the debug directory..

Is it would work if I re-install the SDK

ZapB · wrote on 23 May 2011, 09:15

Have you added #include <gl.h> yourself? If so there is no need, QGLWidget takes care of all that for you. I seem to think there can be issues if OpenGL headers and Windows headers are #include'd in the wrong order.

Dinesh Balu · wrote on 23 May 2011, 09:19

No, I didn't add them... now I'm re-installing the Qt SDK...

Chuck Gao · wrote on 23 May 2011, 09:25

[quote author="Dinesh Balu" date="1306142398"]No, I didn't add them... now I'm re-installing the Qt SDK...[/quote]

Good luck :-)

Dinesh Balu · wrote on 23 May 2011, 09:27

Um.... Let's see... what if it's still not working :(

Dinesh Balu · wrote on 24 May 2011, 06:58

I have re-installed the SDK... Now the errors are gone ,.. and application is running successfully.. except I'm not getting the exact output....

@Chuck.Gao : what was the output you got with the project?

The Project type is Qt Mobile Application , doesn't it support OpenGL and should I go for OpenGL ES...

Chuck Gao · wrote on 24 May 2011, 07:07

The mobile use OpenGL ES, but not OpenGL.
Output for what ? Sorry, i can't see anything until the application crash.

Dinesh Balu · wrote on 24 May 2011, 07:11

[quote author="Chuck.Gao" date="1306134308"]no, it's OK for me. Maybe there have some problem with your environment or SDK, i'm not sure. You can paste the log on this thread, i think someone can resolve your problem[/quote]

You said that you got my app running on your sdk... right?
did you get any output in that?

I have drawn a triangle in that app...

how to use OpenGL ES with QT

Chuck Gao · wrote on 24 May 2011, 07:15

I can build it on both Desktop(also simulator) and Symbian device, but it’ll crash some where.
Qt will use OpenGL ES automatically if you build Symbian based application.

Dinesh Balu · wrote on 24 May 2011, 07:21

[quote author="Chuck.Gao" date="1306221357"]I can build it on both Desktop(also simulator) and Symbian device, but it’ll crash some where.
[/quote]

You mean the application that I sent you will crash somewhere,...

[quote author="Chuck.Gao" date="1306221357"]Qt will use OpenGL ES automatically if you build Symbian based application.
[/quote]

Then why is it not working.... I got the simulator window opened but the triangle is not drawn on the screen...

ZapB · wrote on 24 May 2011, 07:27

That's for you to debug. It's your app. Run it in the debugger and see why it crashes.

Dinesh Balu · wrote on 24 May 2011, 07:37

When I started debugging...
A Warning is shown..
It says..

bq. The preferred debugger engine for debugging binaries of type 'x86-windows-msvc2008-pe-32bit' is not available.
The debugger engine 'Gdb engine' will be used as a fallback.
Details:There is no CDB binary available for binaries in format 'x86-windows-msvc2008-pe-32bit'

What does that mean?

ZapB · wrote on 24 May 2011, 07:40

Which build are you trying to debug? Desktop/simulator/symbian? I would try getting it working on the desktop first.

Dinesh Balu · wrote on 24 May 2011, 07:46

[quote author="ZapB" date="1306222858"]Which build are you trying to debug? Desktop/simulator/symbian? I would try getting it working on the desktop first.[/quote]

That was Qt Simulator -> N900 simulator

I tried that with desktop simulator,... It says Debugging starts..
It does nothing...

No window appears... no output...

This is a Qt Mobile application...