Re: [GtkGLExt] X crash in double mode

[Florent Teichteil <florent_teichteil yahoo fr>]

Michalis Kamburelis a écrit :
> Alex Queiroz wrote:
> 
>> Hallo,
>>
>>        I'm basically using the logo.cc demo as a guide, but my
>> application fails when I request a double-buffered mode. The error
>> message from Gdk is:
>>
>> === BEGIN ===
>> The program 'orbis' received an X Window System error.
>> This probably reflects a bug in the program.
>> The error was 'BadColor (invalid Colormap parameter)'.
>>   (Details: serial 360 error_code 12 request_code 1 minor_code 0)
>>   (Note to programmers: normally, X errors are reported asynchronously;
>>    that is, you will receive the error a while after causing it.
>>    To debug your program, run it with the --sync command line
>>    option to change this behavior. You can then get a meaningful
>>    backtrace from your debugger if you break on the gdk_x_error()
>> function.)
>> === END ===
>>
>>      If a request a single-buffered mode the application starts ok.
>> Has anybody seen this before?
>>
> 
> Are you requesting some additional OpenGL buffers, e.g. stencil or
> accumulation buffer ? Or maybe you're requesting some unusually large
> color depth ? Depending on your graphic card and OpenGL implementation
> you may not be able to get double-buffered visuals if you request such
> additional buffers (especially with large bits, i.e. pixel size). If
> you're under XWindows, you can use `glxinfo' program to check if what
> you request is available.
> 
> Note that the error message you show, "BadColor (invalid Colormap
> parameter)", doesn't suggest the above explanation. But the symptoms
> that you describe (program runs with single buffer, doesn't run with
> double buffer) would suggest the above explanation.
> 
> Michalis

I asyncronously have the same error using gtkglextmm-1.1.0 . I read in a
post that it is a bug in XFree86-dri with some video cards. It can be
due to a bad initialization of OpenGL parameters in your program too.
Please inform us if you find the solution.

Florent