glutInitDisplayString problem

[Chris Marshall-2]

I'm trying to use glutDisplayString() to request
an RGBA, double buffered, depth buffered with an
alpha buffer.  If hardware alpha buffer is not
available than an RGB display is OK.

The string I used to request this was:

   glutInitDisplayString("rgb alpha>=0 double depth");

which returns

   freeglut (test.pl): WARNING - Display string token not recognized:  alpha>=0

A quick look at the source and it appears the
current implementation is pretty much a wrapper
around plain old glutInitDisplay() with little
of the flexibility in display selection that I
had hoped for from glutInitDisplayString().

Is there a work around using FreeGLUT to request
a display with an optional (but preferred if
available) alpha channel?

Thanks,
Chris

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[Fay, John F Dr CTR USAF AFMC 46 SK]

Chris,

        Hello and welcome to the "freeglut" community.

        Unfortunately I don't know of a good workaround for you.  The
full "glutInitDisplayString" functionality has been on my "to do" list
for a LONG time and I simply have never had the time and energy
available to do it.

        A not-so-good workaround might be hack the code itself in
"freeglut_window.c" around lines 85-265 for Posix/X11 or around lines
372-534 for Windows.  That is where the pixel formats are set from the
unpacked display string data.

John F. Fay
Technical Fellow
Jacobs Technology TEAS Group
850-883-1294

-----Original Message-----
From: Chris Marshall [mailto:chm@...]
Sent: Monday, June 15, 2009 2:21 PM
To: freeglut-developer@...
Subject: [Freeglut-developer] glutInitDisplayString problem

I'm trying to use glutDisplayString() to request
an RGBA, double buffered, depth buffered with an
alpha buffer.  If hardware alpha buffer is not
available than an RGB display is OK.

The string I used to request this was:

   glutInitDisplayString("rgb alpha>=0 double depth");

which returns

   freeglut (test.pl): WARNING - Display string token not recognized:
alpha>=0

A quick look at the source and it appears the
current implementation is pretty much a wrapper
around plain old glutInitDisplay() with little
of the flexibility in display selection that I
had hoped for from glutInitDisplayString().

Is there a work around using FreeGLUT to request
a display with an optional (but preferred if
available) alpha channel?

Thanks,
Chris

------------------------------------------------------------------------
------
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royalty-free distribution of the report engine for externally facing
server and web deployment.
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Freeglut-developer@...
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server and web deployment.
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[Chris Marshall-2]

John,

Thanks for the pointer to the code.  I took
a quick look but had not browsed to the
relevant part.  I'm currently working to
port the Perl Data Language to use FreeGLUT
and the Perl OpenGL module instead of the
legacy GLX+X11 code.  That should allow for
operations on win32 and *nix/os x platforms.

--Chris

Fay, John F Dr CTR USAF AFMC 46 SK wrote:

> Chris,
>
> Hello and welcome to the "freeglut" community.
>
> Unfortunately I don't know of a good workaround for you.  The
> full "glutInitDisplayString" functionality has been on my "to do" list
> for a LONG time and I simply have never had the time and energy
> available to do it.
>
> A not-so-good workaround might be hack the code itself in
> "freeglut_window.c" around lines 85-265 for Posix/X11 or around lines
> 372-534 for Windows.  That is where the pixel formats are set from the
> unpacked display string data.
>
> John F. Fay
> Technical Fellow
> Jacobs Technology TEAS Group
> 850-883-1294
>
> -----Original Message-----
> From: Chris Marshall [mailto:chm@...]
> Sent: Monday, June 15, 2009 2:21 PM
> To: freeglut-developer@...
> Subject: [Freeglut-developer] glutInitDisplayString problem
>
> I'm trying to use glutDisplayString() to request
> an RGBA, double buffered, depth buffered with an
> alpha buffer.  If hardware alpha buffer is not
> available than an RGB display is OK.
>
> The string I used to request this was:
>
>    glutInitDisplayString("rgb alpha>=0 double depth");
>
> which returns
>
>    freeglut (test.pl): WARNING - Display string token not recognized:
> alpha>=0
>
> A quick look at the source and it appears the
> current implementation is pretty much a wrapper
> around plain old glutInitDisplay() with little
> of the flexibility in display selection that I
> had hoped for from glutInitDisplayString().
>
> Is there a work around using FreeGLUT to request
> a display with an optional (but preferred if
> available) alpha channel?
>
> Thanks,
> Chris

------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
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