plib-users

[Plib-users] Errors using PW

[Tinoshi K. <ti...@li...>]

Hello everybody!

I have got a big problem with PW. Well, when I use PW my program crashes =
whenever I call something like glOrtho(), or glVertex() etc... The =
debugger says it's due to an access violation. I guess it is 'cause I =
created my windows using pwInit() and OpenGL doesn't know what is the =
'current' window (i.e. says 'this' is NULL).=20
What can I do? I want to use pwInit() instead of glutMainLoop() etc. =
'cause I need a keyboard function who can deal with multiple pressed and =
released keys.=20
It is not a 'coding' problem because using the 'glut approach' =
(glutMainLoop etc... and callbacks) everything works great!

Thanks!  

Re: [Plib-users] Errors using PW

[Steve B. <sjb...@ai...>]

Tinoshi Kitazawa wrote:
> Hello everybody!
>  
> I have got a big problem with PW. Well, when I use PW my program crashes 
> whenever I call something like glOrtho(), or glVertex() etc... The 
> debugger says it's due to an access violation. I guess it is 'cause I 
> created my windows using pwInit() and OpenGL doesn't know what is the 
> 'current' window (i.e. says 'this' is NULL).

Weird.

I havn't seen that happen before.

Do the 'PW' demo programs work on your machine?

> What can I do? I want to use pwInit() instead of 
> glutMainLoop() etc. 'cause I need a keyboard function who can deal with 
> multiple pressed and released keys. 

You can do that in GLUT.

Check out:  glutKeyboardUpFunc/glutSpecialUpFunc.

You can use the regular glutKeyboardFunc to detect keys pressed down
and use the UpFunc to figure out when they are released - then you can
keep an array with one element per key character to handle multiple
press/releases.

However:

1) Be sure to disable key auto-repeat - which confuse the issue horribly.
2) Beware of the situation where someone presses (say) 'a' - then pushes
down the shift key - then releases the 'a'...which will now report as the
capital 'A' being released.

PW has the same kinds of problems.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
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V-- PS++ PE- Y-- PGP-- t+ 5 X R+++ tv b++ DI++ D G+ e++ h--(-) r+++ y++++
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Re: [Plib-users] Errors using PW

[Tinoshi K. <ti...@li...>]

Thanks for the answer,

I solved the problem, but I really don't know why. I know how, however: I 
cut&pasted my old code (where I used glutMainLoop() etc... ), put some 
objects into the scenegraph, the sky, the sea etc... used the functions 
begin2D() and end2D() given in viewer.cxx. Everything worked fine. Then I've 
simply commented the glut initialization and main loop and put the pwInit() 
etc.. instead. The crash happened while trying to
glutGet ( (GLenum) GLUT_WINDOW_HEIGHT ) ;
and, deleting this line, in glOrtho(). The strange thing is that if I don't 
show the 2D text and figures (I'm developing a Flight simulator, so I mean 
the HUD etc..) the sea and the sky are displayed correctly, but nothing in 
the scenegraph is drawned.
Well, I re-wrote the whole code, avoided using begin2D() etc... and now 
everything works fine... but I don't know really what happened. It was just 
a stupid mistake I think so I ask you please forgive me, but the gl calls 
are quite the same in the working code and in the crashing one!
The debugger only said access violation for the glutGet(), so I thought that 
it didn't know my pw window's address... or something like that.
Well, excuse me for bothering, but I was going crazy...

May I ask you a few questions? Where can I find a list of changes between 
plib 1.8.3 and 1.8.4? Where can I find source code using plib's collision 
detection not only for HOT, but also for the other two methods?

THANK YOU SO MUCH!!!! 

Re: [Plib-users] Errors using PW

[Steve B. <sjb...@ai...>]

Tinoshi Kitazawa wrote:

 > The crash happened while trying to
> glutGet ( (GLenum) GLUT_WINDOW_HEIGHT ) ;

Wooaah.  You aren't trying to use glutGet inside a PW program are you?

That wouldn't work.  *EITHER* use GLUT *OR* use PW - you can't mix them.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
-----BEGIN GEEK CODE BLOCK-----
GCS d-- s:+ a+ C++++$ UL+++$ P--- L++++$ E--- W+++ N o+ K? w--- !O M-
V-- PS++ PE- Y-- PGP-- t+ 5 X R+++ tv b++ DI++ D G+ e++ h--(-) r+++ y++++
-----END GEEK CODE BLOCK-----