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Re: IDL/MSWin pixmap limitations, Part 2 [message #33058 is a reply to message #33055]

Mon, 25 November 2002 09:55

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"Craig Hamilton" <someone@microsoft.com> wrote

> In August I asked about a solution to the problem of "unable to
> create pixmap" when running IDL on MSWin 2000. The Most Noble
> David Fanning explained that pixmaps are created in video RAM,
> and, unless your video card is "smart", I am limited by the
> video card. He also suggested a workaround using unmapped draw
> widgets instead of pixmaps.
>
> I have questions about these two potential solutions:
>
> 1. Get a smarter video card (with loads of video RAM, I presume).
> Can anyone suggest a video card that can use system RAM when
> necessary?

Most all video cards on the PC can use system RAM if necessary. My guess is
that this is not a RAM issue, but a driver issue. Your experiences with the
128MB nVidia card and the 32MB ATI card although not definitive support
this. The drivers probably set some limit regardless of the system
resources available.

But, just for fun try upping your "AGP Aperture Size" in your BIOS:

"This option selects the size of the AGP aperture. The aperture is a portion
of the PCI memory address range dedicated as graphics memory address space.
Host cycles that hit the aperture range are forwarded to the AGP without
need for translation. This size also determines the maximum amount of system
RAM that can be allocated to the graphics card for texture storage."

Note that the actual amount of ram available is something like (AGP aperture
size - 12) / 2.

I still think your driver is limiting but give this a shot. The standard
disclaimers apply.

-Rick

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[Message index]

		Re: IDL/MSWin pixmap limitations, Part 2 By: David Fanning on Mon, 25 November 2002 11:30
		Re: IDL/MSWin pixmap limitations, Part 2 By: Pavel A. Romashkin on Mon, 25 November 2002 11:04
		Re: IDL/MSWin pixmap limitations, Part 2 By: Rick Towler on Mon, 25 November 2002 09:55
		Re: IDL/MSWin pixmap limitations, Part 2 By: Craig Hamilton on Mon, 25 November 2002 09:45
		Re: IDL/MSWin pixmap limitations, Part 2 By: David Fanning on Mon, 25 November 2002 08:53

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