In my GLUT app I use a 2048x2048 texture. If I switch from windowed to fullscreen and then back to windowed the texture gets corrupted. Heres an example http://planet3d.demonews.com/Glut.JPG
The top left corner(1024x1024) is fine.
All I do is call glutFullScreen() for fullscreen and
glutPositionWindow(Storedx,Storedy)
glutReshapeWindow(Storedwidth,Storedheight)
to get back to windowed mode.
This problem only occurs if running at a resolution above 1024x768.
At 1024x768 and below I can switch between fullscreen and windowed as much as I want with no problems.
Does this look like a driver bug or am I doing something wrong?
I am using detonators 12.2 on a geforce2.
[This message has been edited by Adrian (edited 06-09-2001).]
I think when you change modes like that in GLUT, you’ll be losing your GL settings – like display lists, textures, matrix stacks, etc. You’ll probably need to re-initialize them. It’s possible they’ll still work even without re-initializing, but anything going to the card may end up stepping on them eventually (like video ram allocations)…
I was reinitialising but it meant a few seconds delay between switching modes. What gets me is that this problem is dependent on screen resolution. To me this points to either a bug in GLUT or drivers rather than a feature of glutfullscreen. I’ve looked at the spec and found no mention of needing to reinitialise.
You’ve looked at the GLUT spec and it doesn’t say to re-init? Try this: do a glGenLists(1) and see if you get a new number or if it starts to re-use old ones. If it’s starts back at 1, then you know the GL has lots its states.
I went through this with a non-GLUT system and had to re-init everything. I could swear that I read something about losing the GL state in regards to GLUT, but that might be in relation to the exit function.
Hmm… interesting. I guess “fullscreen” is more akin to resizing a window than recreating it.
While we’re on the topic of GLUT, I’ve seen on the Mac (as part of their openGL 1.2.1 release) a very comprehensive and up-to-date GLUT reference PDF. The best I can do on the PC is the horribly outdated “glut 3 spec”. Do you know where I could find a version of that reference PDF that’s NOT part of the mac openGL distribution?
To tie up this loose end…
I upgraded from an ELSA GF2 to an ELSA GF3 and the problem disappeared, I am using the same drivers. So looks like it was hardware and not driver related.
MV I dont have the full spec for GLUT, I only found a page specific to glutfullscreen.
While Im here, any one know why
glutGet(GLUT_WINDOW_DEPTH_SIZE)
is returning 16 bits on my GF3, when running identical code on a GF2 and radeon it returns 24. My demo needs a 24 bit z buffer. Could it be to do with the zbuffer compression the gf3 uses?
