Re: XWin can't hold OpenGL picture, has WS_DISABLED and WS_EX_TRANSPARENT styles?

[Mick Pearson <mick dot pearson at wildblue dot net>]

P.S. Sorry to add, the WM_ERASEBKGND message occurred to me, or setting the 
class-background to the "null" brush is a likely culprit. It is behaving like
a front-buffered old-fashioned application somewhat. Clipping and own-DC style 
should prevent damage, but I don't know, something seems to be responding to 
PAINT like events, that don't make sense for OpenGL.

Below is line formatted version of the old text. I have to do this manually for
new text, but the > quoted text is already hard-wrapped.

> XWin has never had a permanent picture with OpenGL. Any movement "damages" all
> windows. I know I've looked at it before, but I checked its window/class styles
> with MS's Spy++ tool today. The normal styles that govern clipping and
> permanence look fine, but it has some weird styles that normally for disabled
> and transparent windows that I wonder are the cause for its abnormal behavior
> in this regard. No OpenGL apps that just draw only OpenGL on a window have
> XWin's problem.
> 
> To be brief, it has these unnatural window-styles in this mail's subject line.
> Other than that, I think it may use Direct3D instead of OpenGL, but normally
> drawing OpenGL or Direct3D onto plain windows doesn't clobber other windows. I
> mean, you have to work hard to make it do something like that.
> 
> A second, unrelated, oddity is the window decorations are sometimes classic
> style, and sometimes current style. It's very odd. It's random in the same
> session. The windows seem to undergo a transition from classic to current, but
> get stuck in classic sometimes. Maybe they are using the old "animated" show
> functions that didn't survive the version of Windows that introduced them.
> 
> Niggling things like this could be fixed. But I don't know how many people use
> Cygwin. I've used it a lot over the years myself, to do development work. XWin
> is the most stable X server. Others don't really get close. But it's kind of
> too comfortable with its crumminess too. Not that I'm going to shove my work
> aside to try to remedy it myself.
> 
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