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Date: Tue, 27 Sep 2016 08:57:35 -0700 (PDT)
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Subject: Re: OpenGL gl.getstring produces erroneous memory access under
 GLOBE_3D on Mac
From: Roger <rogermc@grapevine.com.au>
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Xref: news.eternal-september.org comp.lang.ada:31909
Date: 2016-09-27T08:57:35-07:00
List-Id: <comp.lang.ada>

On Monday, September 26, 2016 at 2:10:42 PM UTC+10, Roger wrote:
> Mac OSX 10.11.6
> XCode 8.0
> GNAT GPL 2016 (20160515-49)
> globe_3d_release_2016-07-05
> 
> I have been writing quite a lot of OPenGL in Ada using GLOBE_3D.
> 
> However, I have just tried to "Checking for OpenGL functionality" as described in Apple's OpenGL Programming Guide for Mac.
> However,  gl.GetString(GL.VENDOR) and other calls to  gl.GetString result in:
> raised CONSTRAINT_ERROR : erroneous memory access
> 
> even if gl.GetString(GL.VENDOR)  is in the only instruction in the program.
> 
> Any ideas on what's causing this will be appreciated.
> 
> Roge
Now it works!
It just needed  a window to be declared:
GLUT.CreateWindow( "Test" )