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

[Mick Pearson <mick.pearson@wildblue.net>]

I've put forward a patch (https://sourceware.org/bugzilla/show_bug.cgi?id=25170) to this for anyone interested. I'll
explore putting it elsewhere, but I really think these mailing lists are an albatross, not sure I want to join another.

----- Original Message -----
> From: "Mick Pearson" <mick.pearson@wildblue.net>
> To: "cygwin" <cygwin@cygwin.com>
> Sent: Wednesday, November 13, 2019 1:27:53 AM
> Subject: Re: XWin can't hold OpenGL picture, has WS_DISABLED and WS_EX_TRANSPARENT styles?

> Sorry (I don't know how to you L A Walsh reply so am replying to myself with the
> same subject)
> I think I meant to include this
> (https://sourceware.org/bugzilla/show_bug.cgi?id=25170) link that
> includes this link:
> 
> https://www.mail-archive.com/search?l=cygwin-xfree@cygwin.com&q=subject:"Re\%3A+Probable+bug+in+WGL+implementation+\(AIGLX\)+of+GLX+calls+in+XWin+\-wgl"&o=newest&f=1
> 
> I was too zealous to be brief, and I think now the window styles are a red
> herring. In any case the
> problems arise in "overdraw" scenarios wherein a window passes over the OpenGL
> windows, that
> is when the background is "erased" and the picture is lose (not held) which
> makes it impossible to
> use XWin for anything but one screen demonstrations of graphical effects. Some
> applications use
> multiple windows and do rendering with OpenGL instead of GTK widgets for
> example. Those can't
> use XWin. I think OpenGL doesn't work with MS Windows X servers. I hope it works
> with Linux ones.
> 
> The other X servers available to Windows are in disarray with regard to OpenGL.
> So it would be good
> if one of them could be made to work. XWin is closest since it doesn't crash and
> does draw correctly
> other than it can't hold a picture.
> 
> ----- Original Message -----
>> From: "Mick Pearson" <mick.pearson@wildblue.net>
>> To: "cygwin" <cygwin@cygwin.com>
>> Sent: Saturday, November 9, 2019 3:49:12 AM
>> Subject: Re: XWin can't hold OpenGL picture, has WS_DISABLED and
>> WS_EX_TRANSPARENT styles?
> 
>> 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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>> 
>> --
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> 
> --
> As with mail, anyone who wishes may send email from your email address. In the
> case you receive obscene or unusual email from an address with which you are
> familiar. It could be someone is impersonating that email address. Always
> return a copy of the email to the sender for review and response.

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