[Gl4java-development] problems with gljMakeCurrent/gljFree

[Thorsten R. <ni...@gm...>]

Hi *,

here comes rather a feedback than a question... Have fun with my bad
english... 8-)
(I hope it's not off-topic)

I wonder if somebody else has the same problems:

I've wrote a tiny test-application, doing nothing but "swapping" front and
back buffer.
(ok, copying back to front buffer via "gljSwap()" - have a look at the
attachment)

I've got the following log:

=== schnipp ===

[...<java emptyLoop_GLCanvas>...]

(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 0 drawables, 0
clients
(II) NVIDIA(0): purgeCache: Free=0x198f000 Total=0x1fd0000
(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 0 drawables, 1
clients
(II) [GLX]: Updating NV driver (scrn 0) with 0 contexts, 0 drawables, 1
clients
(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 0 drawables, 1
clients
(II) [GLX]: Updating NV driver (scrn 0) with 0 contexts, 0 drawables, 1
clients
(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 0 drawables, 1
clients
(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 1 drawables, 1
clients
emptyLoop_canvas.init
emptyLoop_canvas.reshape
..(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 2 drawables, 1
clients
.(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 3 drawables, 1
clients
.(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 4 drawables, 1
clients

[...<counting "drawables" 5-3888> ...]

(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 3889 drawables, 1
clients
# # An unexpected exception has been detected in native code outside the
VM.# Program counter=0x48c3cf8c
#
# Problematic Thread: prio=5 tid=0x81f1498 nid=0x581 runnable
#
Aborted
[thr@elite thr]$ (II) [GLX]: Updating NV driver (scrn 0) with 1 contexts,
3888 drawables, 1 clients
(II) [GLX]: Updating NV driver (scrn 0) with 1 contexts, 0 drawables, 1
clients

[...<last line repeats ~20 times> ...]
[...<auto re-init of X/nvidia-driver> ...]

=== schnipp ===

Configuration:

	PC
	- AMD Athlon 600MHz
	- Asus K7M Mainboard
	- 256MB Ram
	- Asus GeForce2 32MB V7700
	- SBLive Player 1024

	Linux Red Hat 7.0
	- XFree 4.01
	- Gnome (default version on redhat 7.0)
	- KDE (default version on redhat 7.0)

	OpenGL
	- gl4java 2.5.0.0
	- nVidia Drivers 0.94 - 0.96

	also tried
	- Kernel 2.2.18
	- kde 2.01
	- no window manager at all

So I wrote a tiny "GLAnimCanvas" class for my own. As a result there is no
need to call "gljMakeCurrent()" and "gljFree()" in the display() method
anymore (both are called only once at initialization time). Via a
SwingUtilities like method "invokeLater" and "invokeAndWait" other Threads
are able to use OpenGL commands getting executed in the main Render-Thread.
Now no more crashes after two days of running tests. Then I studied the
differences between the class implementations.

My thesis: It look's like something (i.e. the nvidia driver, X, or whatever)
doesn't "like" the gljMakeCurrent()/gljFree() combination called to often.
What is the reason having to call both methods in GLAnimCanvas.display()
every frame?

Any comments ?
[ ] what a hero! ;-)
[ ] nice to know
[ ] what a pain to read
[ ] text to long
[ ] never send attachments
[ ] just get away

ciao, Thorsten