[cairo] OpenGL on Windows

[Roberto Delfiore]

> I compiled the 1.12.2 Cairo version under win32 using your advices and
> enabling the GL surfaces and the WGL functions.
> The build was apparently successfully but in my OpenGL program I was not
> able to display the Cairo surfaces, could you please show me your
> working example code.
>
> Thank you in advance,
>
> Roberto Delfiore


I refer to the following mail by Brent Fulgham Mon Jun 25 13:26:08 PDT 2012:
  

> Last night I was able to get an OpenGL-based Cairo test application to
> build and run under Windows using the 1.12.2 source base.
>
> Attached is the diff to accomplish this.  I found that the default
> function pointer declarations did not work with the Windows GL
> implementation because of differences in calling conventions.  I'm not
> sure if the approach I took to add the declarations is the right one,
> and was hoping someone could review the change and let me know.
>
> To actually build the software, you need the "OpenGL Registry"
> versions of wglext.h and glext.h, which do not ship with Windows.
>
> As I write this, I realize that I forgot to update the Makefile to
> include the GL and WGL source files; I will follow up with this
> missing piece, once I hear back on the other changes.
>
> Thanks,
>
> -Brent
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Roberto Delfiore

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