gl4java-usergroup

[gl4java-usergroup] Integer for Constant

[Alex A. <Az...@ne...>]

Hi,

I'm in need to retrieve the int value for a GL String constant when parsing 
quake3 shaders from a file.

Example:
		blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA

I prepared a method like:
		int getIntForConstant("GL_SRC_ALPHA")

But is there a way to get around this without having to prepare a lookup table 
(Hashtable or similar), maybe a static method in GLContext ?

Java QuakeIIIArena is on the way...

-=[AziD]=-

[gl4java-usergroup] Problem using glDeleteTextures and glDeleteLists methods

[Dragana P. <zm...@an...>]

Hi,

I have a subclass of GLAnimCanvas that prepare DisplayList. Polygons in =
my display list have different textures. Also I have a subclass of =
Applet that create, start, stop and destroy previously described canvas. =
And it works fine.
The goal I want to achieve is to change textures on the fly ... First I =
tried this with glDeleteTextures,  and glDeleteList (note: I used the =
same "pointer" that I used in glGenTextures and glGenLists ) , but JVM =
throws exception:
  " An unexpected exception has been detected in native code outside the =
VM.
  Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at =
PC=3D0x69514194
  Function name=3DglDeleteTextures
  Library=3DC:\WINNT\System32\OPENGL32.DLL

  Current Java thread:
   at gl4java.GLFuncJauJNI.glDeleteTextures(Native Method)=20
  ....."

I solved this problem by destroying and creating GLContext each time I =
want to change texture, but I am not satisfied with this solution.=20
My question is how to use glDeleteTextures and glDeleteLists and when is =
the right time and place to call these methods. I understand that =
problem is in native code, but how to avoid this.=20
I am using JDK 1.3, JRE1.3 and JVM 1.3.1-b24 mixed mode.

Thanks in advance,
Dragana

Re: [gl4java-usergroup] glReadPixels(...) not working

[<Px...@ao...>]

More info:
     When it came time to graph I tried to render my graph to GLOffScreenDrawable and then do glReadPixels it produced the same problem---a pixel array of 0's (from when it was initialized). I've even put some 1's in the initial pixel array to see if anything would change but the 1's stay ones--glReadPixels isn't doing anything.
    Then I tried TGATextureGrabber to save it as a .tga, but it was still an all black (all 0's) picture.
    THEN, I went to the demo's for GLOffScreenDrawable and grabbed the classes gearsOffScreen2Tga.java and gearRenderer and tried to execute the main in gearsOffScreen2Tga and got a big exception.  Here are the first few and last lines of it...

An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6D2150D6
Function=JNU_GetEnv+0xC
Library=c:\j2sdk1.4.0_01\jre\bin\java.dll

Current Java thread:
    at sun.awt.font.NativeFontWrapper.registerFonts(Native Method)
    - locked <06BABD58> (a java.lang.Class)
    at sun.java2d.SunGraphicsEnvironment.addPathFonts(SunGraphicsEnvironment.java:709)
    at sun.java2d.SunGraphicsEnvironment.registerFonts(SunGraphicsEnvironment.java:560)
    at sun.java2d.SunGraphicsEnvironment.access$000(SunGraphicsEnvironment.java:57)
    at sun.java2d.SunGraphicsEnvironment$1.run(SunGraphicsEnvironment.java:160)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.java2d.SunGraphicsEnvironment.<init>(SunGraphicsEnvironment.java:86)

.......

Local Time = Thu Jun 13 09:36:09 2002
Elapsed Time = 1
#
# The exception above was detected in native code outside the VM
#
# Java VM: Java HotSpot(TM) Client VM (1.4.0_01-b03 mixed mode)
#


Is this just a matter of permissions somewhere??  If it is can you point me in the right direction?  I really do appreciate any and all help.

Dennis

Re: [gl4java-usergroup] drawing in native code

[Sven G. <sgo...@ja...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Saturday 08 June 2002 22:32, Robert Voigt wrote:
> Hi,
>
> I have a subclass of GLAnimCanvas. It does all the usual stuff and it
> works. I thought it might be a good idea to do the actual drawing
> (everything from glBegin() to glEnd() ) in native code to speed it up. In
> my case I get the arrays with the vertices and colors from the native side
> anyway.
>
> So I just use the subclass of GLAnimCanvas to set up GL, and call a native
> method in display(). It works, and it even displays different things in
> different canvases if I tell it to. Why does it work? Am I just doing what
> GL4Java would do otherwise (calling native methods)? Why is GL not confused
> about where the drawing commands come from? And does it make sense?
>

well, the curretn gl context is being used, even in your native code, 
if you do not change the gl context.

your native code runs in the same native thread, as the java methods would do.

and yes, the gl calls are native ones, so it gives you nearly _no_ 
speed enhancements (may be 1-5%) just to group a couple of gl calls in 
a native proprietary function.

also - your application ain't compatible anymore, meaning you must provide
a native dynamic library for all plattforms where you want to see your
application running.

this effort in porting gl4java to many plattfroms and to provide binaries
are the most stress factors within our development.
e.g. we have to provide / specificate functionality which must be avaiable
on all the OS / GL implementations etc.

so IMHO it makes no sense to encapsulate some functionality within native methods.

this is true, especially since jdk1.4's NIO Buffers
- - jdk 1.4 with its hotspot vm is a high performance system,
which gives us about 90% of native speed for applications
on modern cpu's (>= 1.2 GHz).

of course this depends on the data management (copy it only once, or many times - etc.).

i hope this is usefull.

look at kenneth's (and my) JavaOne 2002 demo papers .. (search at sun's)

cheers, sven

- -- 
health & wealth
mailto:sgo...@ja...
www   : http://www.jausoft.com ; pgp: http://www.jausoft.com/gpg/
voice : +49-521-2399440 ; fax : +49-521-2399442
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UFHtnbl/qom7pYCAXrVjLQY=
=hdV/
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[gl4java-usergroup] glReadPixels(...) not working

[<Px...@ao...>]

    I'm writing a Java application, not applet, that draws linegraphs/scatterplots, etc.  I have a swing window that has a canvas in the middle of it that displays the graph, and that canvas is a class that extends GLCanvas.
    Drawing the graph is fine---everything shows up perfectly.  My goal and problem is in saving a screenshot of the canvas.  I'm using glReadPixels but nothing's happening.  I create a pixel array: byte[] pixels = new byte[getWidth() * getHeight() * 3];  Then I call gl.glReadPixels(0,0,getWidth(), getHeight(),GL_RGB,GL_UNSIGNED_BYTE,pixels);

BUT, pixels--my array--remains unchanged.  I've tried specifying a buffer with glReadBuffer with all possible buffers but it's still not doing anything.

If a solution isn't obvious please ask me questions so I can be more specific how things are set up.  I'm pretty lost here.

btw I'm using a windows 2000 box with j2sdk1.4.0, and gl4java v. 2.8.2.0.  Any help would be greatly appreciated.

Dennis

RE: [gl4java-usergroup] what is the recommended way of swapping o ne canvas for another?-working now

[Combe, C. <C....@na...>]

thanks Max,
i'd have replied sooner but have been away for a few days. Things are
working now.
I think there was some sort of problem with adding and removing the GLCanvas
components from  a Panel or Frame, just treating them like i would any other
component didn't work anyway. After re-adding them nothing would appear in
them. In my efforts to make it work I just ended up over complicating things
- this was how i got into destroying and creating new instances and using
cvsDispose.
Anyway, I now add all the canvas's i'm going to use to the panel at the
start and set them visible or invisible as required. It confuses layout
managers a bit but i can live with that.
cheers,
colin

-----Original Message-----
From: Max Gilead [mailto:gi...@li...]
Sent: 07 June 2002 16:59
To: gl4...@li...
Subject: Re: [gl4java-usergroup] what is the recommended way of swapping
one canvas for another?


Combe, Colin wrote:

>What is the recommended way of swapping one canvas for another? I'll be
most
>grateful for any advice. I'd really like to use gl4java for this project
and
>the actual drawing of the scene works fine and is fast - its just this
>canvas changing thing that is the problem. :-(
>
Is there any reason you have to destroy the canvas each time? It is very 
inefficient as initialization takes time each time you create a canvas. 
If I were you I would keep two instances of GL canvas, one on screen and 
one in inactive state. If the canvas is invisible (ie. removed from the 
GUI) it won't do anything and you can safely keep it in memory, 
re-adding to the GUI later and it will draw perfectly well. cvsDispose 
call is required when you dump the canvas completely and want it to be GC'd.

HTH,
Max



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[gl4java-usergroup] gljReadPixelGL2AWT

[Andreas W. <a....@gm...>]

Hello

Has anyone ever used the method gljReadPixelGL2AWT from GLContext? I
didn't find much information about it.

I thought that the following code should work, but it didn't.

BufferedImage image =
              new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
DataBufferInt dbInt =
              (DataBufferInt)image.getRaster().getDataBuffer();
glj.gljReadPixelGL2AWT(w,
                       0,
                       0,
                       0,
                       0,
                       w,
                       h,
                       GL_BGRA,
                       GL_UNSIGNED_BYTE,
                       glj.isDoubleBuffer()?GL_BACK:GL_FRONT,
                       dbInt.getData());

Thanks, Andy

[gl4java-usergroup] drawing in native code

[Robert V. <f1...@gm...>]

Hi,

I have a subclass of GLAnimCanvas. It does all the usual stuff and it works. 
I thought it might be a good idea to do the actual drawing (everything from 
glBegin() to glEnd() ) in native code to speed it up. In my case I get the 
arrays with the vertices and colors from the native side anyway. 

So I just use the subclass of GLAnimCanvas to set up GL, and call a native 
method in display(). It works, and it even displays different things in 
different canvases if I tell it to. Why does it work? Am I just doing what 
GL4Java would do otherwise (calling native methods)? Why is GL not confused 
about where the drawing commands come from? And does it make sense? 

Any opinions are appreciated.

Re: [gl4java-usergroup] Newbie: Using GLJPanel

[Chad S. <sta...@ea...>]

Oops, looks like I spoke too soon.  The gljSwap() works just fine, thank =
you.  It's the gljFree() that was throwing the exception.  Please forget =
all the nonsense that I spouted in my previous email.

Thanks, Chad

PS - This does, however, raise the question "When to use gljFree()?

Re: [gl4java-usergroup] Newbie: Using GLJPanel

[Chad S. <sta...@ea...>]

Problem resolved - Only after turning on the GLContext debugging (whose =
debugging capabilities should be much more prominently documented) was I =
able to determine that an exception was being thrown at the end of my =
display method.  It turns out that the glSwap call was the problem.  If =
I remove it and instead wrapper the display methods in a pushMatrix(), =
popMatrix() combo, everything works fine.

Now my question is: Why doesn't glSwap work even after I changed the =
constructor to specify doubleBuffer =3D true?  Does anyone know the =
rules?  I notice that the converted NeHe tutorials use glSwap, but are =
run within the context of an Applet.  None of the Swing demos use =
glSwap.  Is its usage verboten in Swing?

Thanks in Advance, Chad
  ----- Original Message -----=20
  From: Chad Stansbury=20
  To: gl4...@li...=20
  Sent: Friday, June 07, 2002 6:13 PM
  Subject: [gl4java-usergroup] Newbie: Using GLJPanel


  Hello, I'm attempting to learn OpenGL by following the NeHe tutorials, =
and using the GLJPanel to do so.  However, I have so far been unable to =
get anything to display.  The frame is being displayed, but nothing is =
being painted.  I get no error message until I resize or close the =
window, at which point I'm notified that gljDestroy failed (free).

  Any help would be appreciated.

  Thanks, Chad

  Below is the code I'm running:
  ---------------------------------------------------------------------

  import gl4java.swing.GLJPanel;
  import java.awt.BorderLayout;
  import javax.swing.JFrame;

  public class Exercise2
  extends GLJPanel
  {

   // Constructors

   public Exercise2()
   {
    super(true);
   }

   // Overridden GLJPanel Protocol

   public void
   init()
   {
    super.init();
    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    gl.glClearDepth(1.0f);
    gl.glShadeModel(GL_SMOOTH);
    gl.glEnable(GL_DEPTH_TEST);
    gl.glDepthFunc(GL_LESS);
    gl.glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
   }

   public void
   display()
   {
    if (!glj.gljMakeCurrent())
    {
     System.out.println("Make current failed");
     return;
    }

    System.out.println("Started rendering");

    gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    gl.glLoadIdentity();

    gl.glColor3f(1.0f, 1.0f, 1.0f);
    gl.glTranslatef(-1.5f, 0.0f, -6.0f);
    gl.glBegin(GL_TRIANGLES);
     gl.glVertex3f(0.0f, 1.0f, 0.0f);
     gl.glVertex3f(-1.0f, -1.0f, 0.0f);
     gl.glVertex3f(1.0f, -1.0f, 0.0f);
    gl.glEnd();

    System.out.println("Ended rendering");

    glj.gljSwap();
    glj.gljFree();
   }

   public void
   reshape(int pWidth, int pHeight)
   {
    gl.glViewport(0, 0, pWidth, pHeight);
    gl.glMatrixMode(GL_PROJECTION);
    gl.glLoadIdentity();
    glu.gluPerspective(45.0f, (float)pWidth/(float)pHeight, 0.1f, =
100.0f);
    gl.glMatrixMode(GL_MODELVIEW);
   }

   // Test Driver

   public static void
   main(String[] args)
   {
    JFrame lFrame =3D new JFrame("Exercise2");
    Exercise2 lPanel =3D new Exercise2();

    lFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    lFrame.getContentPane().add(lPanel, BorderLayout.CENTER);
    lFrame.setSize(300, 300);
    lFrame.show();
   }

  }

[gl4java-usergroup] Newbie: Using GLJPanel

[Chad S. <sta...@ea...>]

Hello, I'm attempting to learn OpenGL by following the NeHe tutorials, =
and using the GLJPanel to do so.  However, I have so far been unable to =
get anything to display.  The frame is being displayed, but nothing is =
being painted.  I get no error message until I resize or close the =
window, at which point I'm notified that gljDestroy failed (free).

Any help would be appreciated.

Thanks, Chad

Below is the code I'm running:
---------------------------------------------------------------------

import gl4java.swing.GLJPanel;
import java.awt.BorderLayout;
import javax.swing.JFrame;

public class Exercise2
extends GLJPanel
{

 // Constructors

 public Exercise2()
 {
  super(false);
 }

 // Overridden GLJPanel Protocol

 public void
 init()
 {
  super.init();
  gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  gl.glClearDepth(1.0f);
  gl.glShadeModel(GL_SMOOTH);
  gl.glEnable(GL_DEPTH_TEST);
  gl.glDepthFunc(GL_LESS);
  gl.glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 }

 public void
 display()
 {
  if (!glj.gljMakeCurrent())
  {
   System.out.println("Make current failed");
   return;
  }

  System.out.println("Started rendering");

  gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  gl.glLoadIdentity();

  gl.glColor3f(1.0f, 1.0f, 1.0f);
  gl.glTranslatef(-1.5f, 0.0f, -6.0f);
  gl.glBegin(GL_TRIANGLES);
   gl.glVertex3f(0.0f, 1.0f, 0.0f);
   gl.glVertex3f(-1.0f, -1.0f, 0.0f);
   gl.glVertex3f(1.0f, -1.0f, 0.0f);
  gl.glEnd();

  System.out.println("Ended rendering");

  glj.gljSwap();
  glj.gljFree();
 }

 public void
 reshape(int pWidth, int pHeight)
 {
  gl.glViewport(0, 0, pWidth, pHeight);
  gl.glMatrixMode(GL_PROJECTION);
  gl.glLoadIdentity();
  glu.gluPerspective(45.0f, (float)pWidth/(float)pHeight, 0.1f, 100.0f);
  gl.glMatrixMode(GL_MODELVIEW);
 }

 // Test Driver

 public static void
 main(String[] args)
 {
  JFrame lFrame =3D new JFrame("Exercise2");
  Exercise2 lPanel =3D new Exercise2();

  lFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  lFrame.getContentPane().add(lPanel, BorderLayout.CENTER);
  lFrame.setSize(300, 300);
  lFrame.show();
 }

}

[gl4java-usergroup] Texture Loading in Swing

[Powell, M. A. <Mar...@ps...>]

I'm playing with NeHe's Lesson 6 ("Texture Loading") I downloaded
Hodglim's gl4java port. He wrote his as an Applet and I have been
working on moving it to a JFrame. I have done the same to all his
previous apps, but I have having trouble with this one, specifically:=20

	PngTextureLoader texLoader =3D new PngTextureLoader(gl, glu);
	texLoader.readTexture("data/nehe.png");

I removed getCodeBase() as the first param to readTexture as
getCodeBase() is specific to Applet.=20

When I run, the applet clears the screen and then hangs on the
readTexture call. Putting an System.out.println after that line proves
as much. What am I missing? Thanks for any help.

Mark

Re: [gl4java-usergroup] what is the recommended way of swapping one canvas for another?

[Max G. <gi...@li...>]

Combe, Colin wrote:

>What is the recommended way of swapping one canvas for another? I'll be most
>grateful for any advice. I'd really like to use gl4java for this project and
>the actual drawing of the scene works fine and is fast - its just this
>canvas changing thing that is the problem. :-(
>
Is there any reason you have to destroy the canvas each time? It is very 
inefficient as initialization takes time each time you create a canvas. 
If I were you I would keep two instances of GL canvas, one on screen and 
one in inactive state. If the canvas is invisible (ie. removed from the 
GUI) it won't do anything and you can safely keep it in memory, 
re-adding to the GUI later and it will draw perfectly well. cvsDispose 
call is required when you dump the canvas completely and want it to be GC'd.

HTH,
Max

Re: [gl4java-usergroup] could not lock JAWT reference / openOpenGLNative returns false

[Max G. <gi...@li...>]

Hi Colin!

>After using cvsDispose, when I re-add the canvas to the frame it is not
>enabled or initialised, so trying to draw to it doesn't work.
>
If I understand your problem right you should just let the component to 
be drawn on screen. GL context is initialized when the component is 
drawn on screen for the first time and I doubt there is another 
possibility to initialize it.
If you need to draw things without visible component then create 
offscreen context.

HTH,
Max

[gl4java-usergroup] what is the recommended way of swapping one canvas for another?

[Combe, C. <C....@na...>]

hi,
if you've looked at any of my previous emails you'll know that i'm trying to
replace a GLCanvas of one sort with a AWTCanvas or a GLCanvas of a different
sort inside a Frame. No matter what I try it doesn't work. Destroying the
canvas then creating a new object appears to work but it is always leaving
behind a reference to a THread and eventually the prog slows to a crawl. I'm
pretty certain that i'm not leaving behind this reference elsewhere in my
prog. If I avoid creating new objects then after doing cvsDispose and
removing the canvas I cannot get the GLCanvas to be initialised again.
Removing and adding the canvas without ever calling cvsDispose works
sometimes but eventually crashes (this is expected as the documentation says
to always call cvsDispose before removing).

Attatched is a version of my Frame class which tries to destroy and create
the new GL canvas objects.

What is the recommended way of swapping one canvas for another? I'll be most
grateful for any advice. I'd really like to use gl4java for this project and
the actual drawing of the scene works fine and is fast - its just this
canvas changing thing that is the problem. :-(

please help...
colin

[gl4java-usergroup] Re: osx & swing problems

[gerard z. <gzi...@ap...>]

guys,

I'm a little busy with work, right now, but I will look into this as 
soon as possible.

In the meantime, don't forget that you can build gl4java for MacOS X 
now yourself. Dive into the code :-)


cheers

On Thursday, June 6, 2002, at 12:13PM, 
gl4...@li... wrote:

> I am having the exact same problem as Daniel. When starting a GLJPanel
> and GLAnimPanel app it gives me the class cast exception in mac os x. 
> Is
> there a fix? What should I do in the meantime. Gerard, you mentioned
> that this problem occurs if hwaccel is on. Should I turn it off for the
> time being, and if so, how?

[gl4java-usergroup] get_GC error in OS X

[Mark P. <mp...@ps...>]

I downloaded Gerard's latest Mac OS X version of GL4Java and that seemed 
to fix my previous problem of the ClassCastException when using 
GLJPanel, etc. (See osx & swing problems thread). However, now I am 
getting the following error:

set fps    := 20.0 -> 50 [ms/frame]
get_GC: Error, pData is zero
could not open a GL widget -- GL CONTEXT
can't create a GL context

In code that works fine on windows. Am I doing something stupid?

Thanks for any help.
Mark

[gl4java-usergroup] could not lock JAWT reference / openOpenGLNative returns false

[Combe, C. <C....@na...>]

hi, its me again
I'm making some progress but am now stuck again.
I've realized what some of the problems i've been having are. This is what i
currently think is going on - please correct me if i'm wrong... (i'm new to
all this).

Before i can remove the GLCanvas I must do cvsDispose(). My canvas is drawn
by the thread from the model part of the program passing through my subclass
of GLCanvas, the way I was calling cvsDispose() didn't work because it was
the event thread for the button that was doing it, so i got errors to do
with 'not holding context'. This was fixed by using
shaded3D.getGLContext().gljMakeCurrent() before calling cvsDispose().
(shaded3D is my subclass of GLCanvas.)

After using cvsDispose, when I re-add the canvas to the frame it is not
enabled or initialised, so trying to draw to it doesn't work. I can enable
it by using setGLEnabled(true), but then it still isn't initialised. To
initialise it i have to use createGLContext(Graphics g), but I'm not sure
how to do this. createGLContext() is a method in GLContext so I need a
GLContext before I can call it. So in my Frame class I'm doing
shaded3D.getGLContext().createGLContext(this.getGraphics());

This doesn't work, I've tried to pursue the cause of why it doesn't work
into the gl4java source code and the reason is that openOpenGLNative()
returns false. 
The error messages are:

could not open a GL widget -- GL CONTEXT
can't create a GL context
GL4Java ERROR: openOpen could not lock JAWT reference! 

I've tried passing createGLContext() the graphics object from both the
GLCanvas and the Frame.
Any suggestions about what i'm doing wrong?

thanks again,
colin




-----Original Message-----
From: Combe, Colin 
Sent: 04 June 2002 16:41
To: Combe, Colin
Cc: gl4...@li...
Subject: RE: [gl4java-usergroup] prog never returns from
gljMakeCurrent()


thanks, i just tried changing it but it didn't help :-(
I'll leave it as a subclass of GLCanvas.
colin

-----Original Message-----
From: Kenneth B. Russell [mailto:kbr...@al...]
Sent: 04 June 2002 16:26
To: Colin Combe
Cc: gl4...@li...
Subject: Re: [gl4java-usergroup] prog never returns from
gljMakeCurrent()



> hi, i've been trying different ways of swapping one type of GLCanvas in an
> application for another. Here's the current problem - after removing a
> GLAnimCanvas from the a JPanel and then adding it again, the program never
> returns from the glj.gljMakeCurrent() method, it just fails silently. The
> following bit of code prints "hello" and nothing else, and then the
program
> is frozen.

Have you tried subclassing GLCanvas instead? It has fewer
assumptions built into it.

Re: [gl4java-usergroup] Re: osx & swing problems

[Mark P. <mp...@ps...>]

Hi

I am having the exact same problem as Daniel. When starting a GLJPanel 
and GLAnimPanel app it gives me the class cast exception in mac os x. Is 
there a fix? What should I do in the meantime. Gerard, you mentioned 
that this problem occurs if hwaccel is on. Should I turn it off for the 
time being, and if so, how?

Thanks for any help.
Mark

On Tuesday, March 19, 2002, at 01:16  PM, gerard ziemski wrote:

> Daniel
>
> The hwaccel mechanism in Apple's Java implementation uses OpenGL. 
> Currently, if you turn hwaccel on, you will run into problems if you 
> try to run gl4java at the same time. It should be easy to make gl4java 
> work with hwaccel, after all, they use the same hardware accelerated 
> surface, so the entire step of gl4java asking and pinning down its own 
> hwaccel surface goes away. But it takes time, however little, to do it 
> and right now I'm busy working on Java and preparing for WWDC. After 
> all what good is gl4java without kick ass Java support underneath it 
> right? ;-)
>
> I will look at gl4java shortly and update it.
>
> cheers
>
>
>> Date: Sat, 16 Mar 2002 23:34:40 +0100
>> From: Daniel Bisig <db...@if...>
>> To: gl4...@li...
>> Subject: [gl4java-usergroup] osx & swing problems
>>
>> Hi all,
>>
>> I trying to get the swing demo files to run under Mac OS X 10.1.3. The
>> gl4java Version is 2.7.2.0. which I downloaded from Gerard Ziemski 
>> page.
>> At the moment, these demos and all the other examples that I found 
>> which
>> make use of either GLAnimPanel or GLJPanel produce the follwing
>> exception:
>>
>> An exception is thrown, while creating a GL context
>>
>> java.lang.ClassCastException:
>> com.apple.mrj.internal.awt.basepeers.VContainerPeer
>> java.lang.ClassCastException:
>> com.apple.mrj.internal.awt.basepeers.VContainerPeer
>> ...etc...
>>
>> I have no clue whether this is a problem of apple's java implementation
>> or of gl4java. I would really like to include some opengl functionality
>> in my visualization program which makes heavy use of swing. For this
>> reason I appreciate any tips and tricks how to get gl4java and swing to
>> work under Mac OS X.
>>
>> Thanks in advance!
>>
>>         Daniel
>
>
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup
>

RE: [gl4java-usergroup] prog never returns from gljMakeCurrent()

[Combe, C. <C....@na...>]

thanks, i just tried changing it but it didn't help :-(
I'll leave it as a subclass of GLCanvas.
colin

-----Original Message-----
From: Kenneth B. Russell [mailto:kbr...@al...]
Sent: 04 June 2002 16:26
To: Colin Combe
Cc: gl4...@li...
Subject: Re: [gl4java-usergroup] prog never returns from
gljMakeCurrent()



> hi, i've been trying different ways of swapping one type of GLCanvas in an
> application for another. Here's the current problem - after removing a
> GLAnimCanvas from the a JPanel and then adding it again, the program never
> returns from the glj.gljMakeCurrent() method, it just fails silently. The
> following bit of code prints "hello" and nothing else, and then the
program
> is frozen.

Have you tried subclassing GLCanvas instead? It has fewer
assumptions built into it.

Re: [gl4java-usergroup] prog never returns from gljMakeCurrent()

[Kenneth B. R. <kbr...@al...>]

> hi, i've been trying different ways of swapping one type of GLCanvas in an
> application for another. Here's the current problem - after removing a
> GLAnimCanvas from the a JPanel and then adding it again, the program never
> returns from the glj.gljMakeCurrent() method, it just fails silently. The
> following bit of code prints "hello" and nothing else, and then the program
> is frozen.

Have you tried subclassing GLCanvas instead? It has fewer
assumptions built into it.

[gl4java-usergroup] prog never returns from gljMakeCurrent()

[Combe, C. <C....@na...>]

hi, i've been trying different ways of swapping one type of GLCanvas in an
application for another. Here's the current problem - after removing a
GLAnimCanvas from the a JPanel and then adding it again, the program never
returns from the glj.gljMakeCurrent() method, it just fails silently. The
following bit of code prints "hello" and nothing else, and then the program
is frozen.

            System.out.println("hello");
            //Ensure GL is initialised correctly
            if (glj.gljMakeCurrent() == false)
                        {
                        System.out.print("whoops");
                        return;
                        }
            System.out.println("made it");  

any suggestions?
thanks,
col

RE: [gl4java-usergroup] how to make GLAnimCanvas release all reso urces?

[Combe, C. <C....@na...>]

thanks max - but unfortunately i still have the same problem. I should =
have
said before that the destroy method in the classes that inherit from
GLAnimCanvas call cvsDispose, sorry for this ommission. I changed the =
code
so that cvsDispose is called before I remove the canvas from the =
JPanel, but
it didn't help. I've also tried destroying the GLContext myself rather =
than
via cvsDispose but no luck there. The action performed method for the =
change
view button is now as follows (i think my desperation is apparent in =
the way
the switch statement has been written :-)=20

    void changeView_actionPerformed(ActionEvent e)
    {
        land.running =3D false;
        while (land.isAlive())
        {
            System.out.println("waiting");
            try {Thread.sleep(150);}
            catch (InterruptedException ex)
{System.err.println(ex.toString());}
        }
        land =3D null;
        switch (canvasType)
        {
            case 1: displayPanel.remove((Canvas2D) canvas);
                    canvasType =3D 2;
                    canvas =3D new Shaded3D (800, 600);
                    displayPanel.add((Shaded3D) canvas);
                    break;
            case 2: ((Shaded3D)canvas).stop();
                    ((Shaded3D)canvas).getGLContext().gljFree();
                    ((Shaded3D)canvas).getGLContext().gljDestroy();
                    ((Shaded3D) canvas).cvsDispose();
                    ((Shaded3D)canvas).setVisible(false);
                    ((Shaded3D)canvas).setEnabled(false);
                    displayPanel.remove((Shaded3D) canvas);
                    canvas =3D null;
                    canvasType =3D 3;
                    canvas =3D new Coloured3D (800, 600);
                    displayPanel.add((Coloured3D) canvas);
                    break;
            case 3: ((Coloured3D) canvas).stop();
                    ((Coloured3D)canvas).getGLContext().gljFree();
                    ((Coloured3D)canvas).getGLContext().gljDestroy();
                    ((Coloured3D) canvas).cvsDispose();
                    ((Coloured3D)canvas).setVisible(false);
                    ((Coloured3D)canvas).setEnabled(false);
                    displayPanel.remove((Coloured3D) canvas);
                    canvas =3D null;
                    canvasType =3D 1;
                    canvas =3D new Canvas2D ();
                    displayPanel.add((Canvas2D) canvas);
                    break;
        }
        land =3D new NormLand(canvas);
        canvas.setLand(land);
	  land.running =3D true;
        land.start();
    }

'land' is the thread that the model runs in, i know its not the this =
thread
that i'm not recovering resources from as the button that stops and =
restarts
the model works fine. Also, after chnaging the view a few times, the =
program
still runs at the normal speed when seen in the 2D display, its only =
the
GLCanvas's that are slowed down. I'm using java version 1.3.1_02.=20

cheers,
colin

-----Original Message-----
From: Max Gilead [mailto:gi...@li...]
Sent: 02 June 2002 19:31
To: gl4...@li...
Subject: Re: [gl4java-usergroup] how to make GLAnimCanvas release all
resources?


Combe, Colin wrote:

>any suggestions about what i'm doing wrong?
> =20
>
Most probably it's missing cvsDispose call (from GLCanvas Javadoc):

"IF you remove/release a GLCanvas, e.g. you want to close/dispose =
it=B4s=20
Window (which contains this GLCanvas), you HAVE TO call:

cvsDispose <cid:par...@li...>
=20

You should call this before releasing/dispose this Window ! Also you =
can=20
overwrite this class, to dispose your own elements, e.g. a Frame etc. - =

but be shure that you call cvsDispose implementation call this one !"

HTH,
Max

Re: [gl4java-usergroup] how to make GLAnimCanvas release all resources?

[Max G. <gi...@li...>]

Combe, Colin wrote:

>any suggestions about what i'm doing wrong?
>  
>
Most probably it's missing cvsDispose call (from GLCanvas Javadoc):

"IF you remove/release a GLCanvas, e.g. you want to close/dispose it´s 
Window (which contains this GLCanvas), you HAVE TO call:

cvsDispose <cid:par...@li...>
 

You should call this before releasing/dispose this Window ! Also you can 
overwrite this class, to dispose your own elements, e.g. a Frame etc. - 
but be shure that you call cvsDispose implementation call this one !"

HTH,
Max

[gl4java-usergroup] Followup: opengl font + JNI

[Alban <aco...@wa...>]

>> 1. Is the buffer of GL4Java compactible with the buffer of opengl(c++)??
>> Though GL4Java is developed from opengl, i don't know do the buffers can=
 be
>> shared?? By my concept, Java's memory is on the Virtual Machine; C++'s
>> memory is OS dependent.
> Anyone? Sven? IMHO it is very interesting question. I suppose that it
> should be possible to reuse opengl context by both native and java code
> (after all gl4java calls native library) but I think someone who really
> knows gl4j guts should speak up :-)
I guess this should be possible as well, but I don't beleive there is any
interest using gl4java if you end up coding in c++, having to manage bridge=
s
between c++ and java code, having to modify and recompile the gl4java
library and so on. In that case, it seems better to go straight for c++ !
=20
>> 3.Moreover, on the nehe web site. I found that the tutorial lesson17-dra=
w
>> textured font. Could I drawing the textured font with GL4Java??? such as
>> using glTexParameteri(), glGenLists() , glGenLists()....
> Sure, why not? These are normal OpenGL commands so they're perfectly
> useable with GL4Java.
I you look at the end of the article on NEHE website, there is a link to
download the source and binaries in gl4java.

>> 4. I am thinking, haven't make any decision. Should I use glFont lib as =
JNI
>> ?? info got form:http://students.cs.byu.edu/~bfish/glfont2.php
>>=20
> I have not checked it in detail but Java has got nice true type font
> support and I am wondering if it wouldn't be just simpler to write a
> Java implementation of such library instead of messing with JNI.
There are some demos apparently made by  Sven in the cathegory Misc demos
that makes use of glutfonts. They are named GLUT Font Stroke 1, GLUT Font
Bitmap 1 & 2.
But this kind of font support seems to be strictly limited to a small count
of typos (like arial, helvetica, sans-serif), and doesn't appear to provide
font antialiasing.=20
Sven, what can you tell us about this kind of font support ? Is it limited
to a few fonts or opened to virtually any true type font ?

My guess is that if you want to get perfect portability and any kind of fon=
t
support, the best is to go for textured fonts, the Nehe's lesson 17's way.

Anyway I am very interested by the topic. If you guys have some good ideas
for a smooth way of dealing with textured fonts (especialy the font texture
generation, or the import of glfont files as pure java) I'm interested to
discuss it. Glfont files could probably be read from from java. But when it
comes to translate a c++ fread, I don't know how to deal with this.
Any c++ guru coding in java willing to help ?

Regards,

Alban Cousini=E9