Re: 2 questions about Application Services, 1 about backend

[Xavier Glattard]

Julien Isorce a écrit :
> Hi,
>
> I am playing with GNUstep for some hours now and I still wondering about 
> 3 things that I discarded at start.
>
> ** 1. Using GNUstep,  
> CGDisplayIDToOpenGLDisplayMask(kCGDirectMainDisplay) seems to be not 
> supported.
(...)
CG* functions are Apple specific. Look for WGL similar functions on 
Windows, or for GLUT or SDL functions. This is not a GNUstep related issue.

> ** 2. CGCaptureAllDisplays and CGReleaseAllDisplays seem to be not 
> supported on GNUstep.
(...)
This may help:
http://www.cocoadev.com/index.pl?WindowOnEveryScreen

> ** 3. How can I check at runtime if a function is implemented by the 
> platform backend ?
> For example "setValues" is not implemented on win32:
>  [[self openGLContext] setValues:&swapInterval 
> forParameter:NSOpenGLCPSwapInterval];

A call to a non-implemented method raises an exception. You may catch 
it. As it's only implemented by Apple a compile time check should do the 
job. But is this what you need ?
Once again you might have to look for WGL functions
See WGL_EXT_swap_control. This is an extension and might not be 
supported by some old PC hardware.

'back/Source/win32/w32_GLcontext.m' might be the place to put your 
changes in ;)

Regards
- Xavier