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Offline DavidYazel

Junior Devvie




Java games rock!


« Posted 2003-07-27 02:38:01 »


I tried rendering when the GLCanvas was not visible.  The Frame that the GLCanvas was in was not visible.  All I got was a black readback from the color buffer.

Is there a trick to this?

David Yazel
Xith3D Project Founder
http://xith3d.dev.java.net

It may look complicated, but in the end it is just a bunch of triangles
Offline Ken Russell

JGO Coder




Java games rock!


« Reply #1 - Posted 2003-07-27 05:58:56 »

Probably won't work because the GLCanvas expects the underlying device context to be present. You might try using a subordinate pbuffer to a GLCanvas, though. JOGL's pbuffer support currently works on Windows and X11 with the Mac OS X port coming once 10.3 is released. See the jogl-demos project for a couple of examples that use pbuffers. However they all currently expect the parent window to be visible and I'm not sure whether they will work if it is hidden.
Offline DavidYazel

Junior Devvie




Java games rock!


« Reply #2 - Posted 2003-07-27 11:37:50 »

OK.  I will open up an enhancement request on the project page.  Being able to render to an offscreen canvas is a pretty necessary thing.

Basically there are lots of places where you need to take pictures to include into your regular scene.  Rendering to pbuffers is also important, but what I am talking about is needing a whole new context, with different configuration, size, etc.


David Yazel
Xith3D Project Founder
http://xith3d.dev.java.net

It may look complicated, but in the end it is just a bunch of triangles
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Offline Ken Russell

JGO Coder




Java games rock!


« Reply #3 - Posted 2003-07-28 02:03:09 »

Please look at the pbuffer support JOGL currently has before you file an RFE. It provides a completely new, hardware-accelerated, offscreen context.
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