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Re: IDL 6.1.1 : how to activate opengl in hardware ? [message #42353 is a reply to message #42348]

Fri, 28 January 2005 06:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

=?ISO-8859-1?Q?J=E9r=F4me_Boivin?= writes:

> Ok, I think I understand... when you set RETAIN=2 in Widget_Draw(), then
> it desactivate hardware rendering !!! With RETAIN=0, I must control the
> drawing update, but hardware rendering is back ! Is it a bug, or I
> misunderstood what RETAIN keyword means ?

I doubt hardware rendering is deactivated, but having IDL
maintain backing store definitely means that IDL has to
render each scene twice, once to the window and once to
the restoring pixmap. No doubt it would be slower. And,
depending upon how this is implemented, it may even be
much slower.

In the early days, setting RETAIN=2 on an object graphics
window caused an error. These days it is allowed, but still
seems rather pointless, since you carry around the means
to restore the window in your view anyway. No sense carrying
it around twice! As a rule, I always set RETAIN=0 in all
object graphics windows.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: Karl Schultz on Fri, 28 January 2005 10:05
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: David Fanning on Fri, 28 January 2005 06:40
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: Jérôme Boivin on Fri, 28 January 2005 06:26
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: Jérôme Boivin on Fri, 28 January 2005 05:19
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: David Fanning on Thu, 27 January 2005 22:31
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: netnews.comcast.net on Thu, 27 January 2005 22:13
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: David Fanning on Thu, 27 January 2005 13:06
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: Jérôme Boivin on Thu, 27 January 2005 12:52
		Re: IDL 6.1.1 : how to activate opengl in hardware ? By: David Fanning on Thu, 27 January 2005 10:51

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