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From: fungus <openglMYSO...@artlum.com>
Newsgroups: comp.graphics.api.opengl
Subject: Re: Getting started in Windows
Date: Sat, 1 Jan 2011 03:46:46 -0800 (PST)
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On Dec 31 2010, 10:27=A0pm, "James Van Buskirk" <not_va...@comcast.net>
wrote:
> "fungus" <openglMYSO...@artlum.com> wrote in message
>
> news:b3bd2e8a-a1e2-4690-aab2-57f20c01ae7b@32g2000yqz.googlegroups.com...
>
> > Easy way to find out: Take a screenshot and
> > see if what's captured matches what your
> > eyes were seeing.
>
> I did try capturing the screen with <CTRL><PrtScn> and then pasting
> it into Paint, and there was only one image with obvious jaggies.
> However in one screen shot there was tearing. =A0Does that mean I'm
> not getting double-buffering or can <CTRL><PrtScn> switch buffers
> in the middle of its operation?
>

I think you'd notice if you didn't have
double-buffer... :-)

Most graphics cards can't swap individual
areas of the screen so SwapBuffers() usually
has to do a copy from back buffer to front
buffer in a window. I guess the screenshot
can interrupt that copy.