Re: MXE and GL_MULTISAMPLE

[PhilipNienhuis]

Rik-4 wrote
> On 05/24/2014 09:00 AM, 

> octave-maintainers-request@

>  wrote:
>> Date: Sat, 24 May 2014 06:17:33 -0700 (PDT)
>> From: PhilipNienhuis <

> pr.nienhuis@

> >
>> To: 

> octave-maintainers@

>> Subject: [MXE] build errors (GL_MULTISAMPLE etc not found)
>> Message-ID: <

> address@hidden

>>
>> Content-Type: text/plain; charset=us-ascii
>>
>> Hi,
>>
>> While trying to a cross-build a recent octave-4.1.0+ I get compile errors
>> (relating to core Octave cs be8d7721ac16 "Use OpenGL line smoothing when
>> multisample is not found"):
>>
>> : 
>> ..../gl-render.cc:647:17: error: 'GL_MULTISAMPLE' was not declared in
>> this
>> scope  
>>       glEnable (GL_MULTISAMPLE);
>> :
>> ..../gl-render.cc:649:22: error: 'GL_SAMPLE_BUFFERS' was not declared in
>> this scope
>>        glGetIntegerv (GL_SAMPLE_BUFFERS, &iMultiSample);
>> :
>> .../gl-render.cc:650:22: error: 'GL_SAMPLES' was not declared in this
>> scope
>>        glGetIntegerv (GL_SAMPLES, &iNumSamples);
>> :
>>
>> A few minute before, that same octave-4.1.0+ was built fine for (and runs
>> fine in) linux, all I did after that was "make all dist", copy that into
>> mxe-octave, fix the checksums, and start an mxe build.
>>
>> Comparing my system's  /usr/include/GL/gl.h  with  mxe's 
>> 
> <mxe-octave>
> /usr/usr/i686-w64-mingw32/include/GL/gl.h  I can confirm that
>> definitions for GL_MULTISAMPLE etc are lacking in the latter. 
>>
>> (A little surprising to me as my linux build system (Mageia-2) is a bit
>> old,
>> the octave build dependencies are the distro-supplied ones and I figured
>> in
>> MXE the various build tools & dependencies would be more up-to-date.)
>>
>> OK, my mxe build tree isn't bleeding edge (~5 weeks old, 
>> 578:583d3bf548e6
>> "texinfo: update to 5.2 and install all tools"). But in later changesets
>> I
>> didn't spot opengl-related updates.
> Philip,
> 
> According to this Stack Overflow question
> (http://stackoverflow.com/questions/4207506/where-is-gl-multisample-defined)
> Windows
> does not include GL_MULTISAMPLE in gl.h.  Apparently this doesn't mean it
> might not have the capability.  Before this capability was incorporated in
> to mainline code at OpenGL 1.3 it was an extension.  As a quick test, you
> might try "#include glext.h" and change GL_MULTISAMPLE to
> GL_MULTISAMPLE_ARB.  If that works I guess we could figure out a way to
> code that into a test for configure.ac.  I checked my MXE sources and
> glext.h includes the alternate definition.

Thanks, I'll give it a try.

Philip




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