Problem with reshape calling JOGL

[Andrew Lentvorski]

I'm trying to use jogl from Jython.  I tried the demo at:
http://wiki.python.org/jython/JythonMonthly/Articles/January2007/2

This got me a nice segmentation fault.  So, I backed up and tried a
plain java JOGL demo.  That works fine and validates that I have JOGL
installed correctly.

So, then I tried to isolate a bunch of stuff.  After chopping a lot of
the code away, I noticed that the "reshape" function is being called
multiple times with *different number of arguments*.

I can obviously just test for the number of arguments, but do I *really*
want to do this?  It seems like something is fundamentally flawed with
this approach.  Why is reshape being called with two different numbers
of arguments?  Is this expected?

Code follows.

Thanks,
-a



from javax.swing import *
from java.awt import *
from javax.media.opengl import *

from java.lang import InterruptedException
from java.lang import Thread

class GLPanel2A(JPanel, GLEventListener):
     def __init__(self):
         print "GLPanel __init__..."
         self.canvas = GLCanvas()
         self.canvas.addGLEventListener(self)
         self.add(self.canvas)
         self.setSize(320,480)
         self.canvas.setSize(320,480)
         self.canvas.setVisible(True)

     def init(self, glDrawable):
         print "GLPanel init..."

     def reshape(self, *a):
         print "Reshape... Numargs:", len(a)
         print a

     def display(self, *a):
         print "Display... Numargs:", len(a)
         print a

class JOGLTest(JFrame):
     def __init__(self):
         print "__init__..."
         self.running = False
         self.animThread = None
         self.a = None
         self.b = None

     def init(self):
         print "init..."
         glPanelA = GLPanel2A()
         self.getContentPane().add(glPanelA)
         self.a = glPanelA

if __name__== "__main__":
    jogl = JOGLTest()
    jogl.init()
    jogl.setSize(400, 400)
    jogl.visible = True

    while (True):
        try:
            Thread.sleep(100)
        except InterruptedException, e:
            raise



------------------------------------------------------------------------------
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
_______________________________________________
Jython-users mailing list
Jython-users@...
https://lists.sourceforge.net/lists/listinfo/jython-users

[Marc Downie]

Why is reshape being called with two different numbers
of arguments?  Is this expected?

I'll guess: reshape(x,y,w,h) in JComponent (JPanel superclass) and reshape(GLAutoDrawable, x,y,w,h) in GLEventListener.

A segfault is always bad news (and hard to pin on Jython --- whoever is making your JVM might be interested in a bug report), but JOGL is very low level — some times, depending on drivers, I have been able to give you a page of Python that locks up a machine.

best of luck,

Marc.

-------------------------------

openendedgroup.com

------------------------------------------------------------------------------
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
_______________________________________________
Jython-users mailing list
Jython-users@...
https://lists.sourceforge.net/lists/listinfo/jython-users

[Josh Juneau-3]

I'm glad to hear that you tried out the sample, sorry to hear that it failed for you.  I went back and ran the same code that I posted in my sample on a different machine and also had a seg fault.  This is perhaps due to a different JDK since I tried to run it on a Mac this time.  It may also be due to a different version of JOGL.  Sorry that I'm no expert in JOGL so I cannot say for certain.

I agree with Marc's response that reshape() is implemented different ways within the JComponent and GLEventListener...that's probably why you get the different # of args...but I can't be sure without digging more deeply into the code.

Hope that you're able to work something out to overcome the issues.

Best

Josh Juneau
juneau001@...
http://jj-blogger.blogspot.com
http://www.gathereventplanning.com
Twitter ID:  javajuneau

On Thu, Jun 4, 2009 at 6:27 PM, Andrew Lentvorski <bsder@...> wrote:

I'm trying to use jogl from Jython.  I tried the demo at:
http://wiki.python.org/jython/JythonMonthly/Articles/January2007/2

This got me a nice segmentation fault.  So, I backed up and tried a
plain java JOGL demo.  That works fine and validates that I have JOGL
installed correctly.

So, then I tried to isolate a bunch of stuff.  After chopping a lot of
the code away, I noticed that the "reshape" function is being called
multiple times with *different number of arguments*.

I can obviously just test for the number of arguments, but do I *really*
want to do this?  It seems like something is fundamentally flawed with
this approach.  Why is reshape being called with two different numbers
of arguments?  Is this expected?

Code follows.

Thanks,
-a



from javax.swing import *
from java.awt import *
from javax.media.opengl import *

from java.lang import InterruptedException
from java.lang import Thread

class GLPanel2A(JPanel, GLEventListener):
    def __init__(self):
        print "GLPanel __init__..."
        self.canvas = GLCanvas()
        self.canvas.addGLEventListener(self)
        self.add(self.canvas)
        self.setSize(320,480)
        self.canvas.setSize(320,480)
        self.canvas.setVisible(True)

    def init(self, glDrawable):
        print "GLPanel init..."

    def reshape(self, *a):
        print "Reshape... Numargs:", len(a)
        print a

    def display(self, *a):
        print "Display... Numargs:", len(a)
        print a

class JOGLTest(JFrame):
    def __init__(self):
        print "__init__..."
        self.running = False
        self.animThread = None
        self.a = None
        self.b = None

    def init(self):
        print "init..."
        glPanelA = GLPanel2A()
        self.getContentPane().add(glPanelA)
        self.a = glPanelA

if __name__== "__main__":
   jogl = JOGLTest()
   jogl.init()
   jogl.setSize(400, 400)
   jogl.visible = True

   while (True):
       try:
           Thread.sleep(100)
       except InterruptedException, e:
           raise



------------------------------------------------------------------------------
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
_______________________________________________
Jython-users mailing list
Jython-users@...
https://lists.sourceforge.net/lists/listinfo/jython-users

------------------------------------------------------------------------------
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
_______________________________________________
Jython-users mailing list
Jython-users@...
https://lists.sourceforge.net/lists/listinfo/jython-users