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Re: Can a CALL_EXTERNAL .dll create a window? [message #36294 is a reply to message #36289]

Fri, 29 August 2003 14:56

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"Karl Schultz" wrote in message...
>
> "Matt Feinstein" wrote in message...
>> Hi all--
>>
>> I'm trying to write a CALL_EXTERNAL .dll that does off-screen
>> hardware-assisted OpenGL rendering.
>
> One (rather different) approach is to create an object of some sort that
is
> derived from an existing IDL graphics object and override its Draw method.
> You can override the Draw method in IDL .PRO code and have it do a
> CALL_EXTERNAL to your C code that calls OpenGL. At this point, there is
> already a window and GL context active that were created by IDL and are
the
> window and GL context that your OpenGL calls will be directed to. Of
> course, this means you'll be using a window provided by IDL.
>
> I know this works because I recently hacked up a class derived from
> IDLgrVolume that calls the Volume Graphics library (VGL -
> http://www.volumegraphics.com/products/vgl/) to render a volume, instead
of
> using IDL's volume renderer. When I told the VGL to render, it just
happily
> used its OpenGL calls in the IDL window and context. The results were
> pretty encouraging, but my time and trial VGL license expired. I've been
> thinking about tossing what I have into the user-conrtrib lib anyhow.
>

Hi Karl,

When you get a chance, *do* put this into the user contrib site. It sounds
like a wad of fun just waiting to burn my time.

-Rick

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[Message index]

		Re: Can a CALL_EXTERNAL .dll create a window? By: Karl Schultz on Wed, 03 September 2003 09:03
		Re: Can a CALL_EXTERNAL .dll create a window? By: Matt Feinstein on Sat, 30 August 2003 04:39
		Re: Can a CALL_EXTERNAL .dll create a window? By: Rick Towler on Fri, 29 August 2003 14:56
		Re: Can a CALL_EXTERNAL .dll create a window? By: Karl Schultz on Fri, 29 August 2003 14:23
		Re: Can a CALL_EXTERNAL .dll create a window? By: Matt Feinstein on Fri, 29 August 2003 13:33
		Re: Can a CALL_EXTERNAL .dll create a window? By: Rick Towler on Fri, 29 August 2003 12:21

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