OpenGL 3.2 on MacBook Air

Nick

Sage

Posts: 1,066
Joined: 2004.07

Post: #1

Jul 21, 2011 — 08:28 AM

I have a MacBook Air with the NVIDIA GeForce 320M. I just got Lion installed and wanted to start playing with OpenGL 3.2. I watched one of the WWDC videos and they explained how to get a 3.2 context, however no matter what I try I always end up with a 2.1 version coming back from glGetString. Any ideas?

Here's the code I'm trying to use:

Code:

NSOpenGLPixelFormatAttribute attr[] = 

{

    NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,

    NSOpenGLPFAColorSize, 24,

    NSOpenGLPFAAlphaSize, 8,

    NSOpenGLPFAAccelerated, 0

};

NSOpenGLPixelFormat *pix = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];    

[self.glView setPixelFormat:pix];

NSString *versionString = [NSString stringWithCString:(const char*)glGetString(GL_VERSION)

                                             encoding:NSASCIIStringEncoding];

NSLog(@"OpenGL Version: %@", versionString);

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Jul 21, 2011 — 08:57 AM

I don't know that setting the pixel format on an OpenGL view recreates the context, and it certainly doesn't make the context current...

You might like to start with eg. https://github.com/onesadcookie/ObjCGameBase and modify the pixel format attributes there.

Nick

Sage

Posts: 1,066
Joined: 2004.07

Post: #3

Jul 21, 2011 — 09:16 AM

Thanks, I'll give that a try when I get home from work tonight.

Nick

Sage

Posts: 1,066
Joined: 2004.07

Post: #4

Jul 21, 2011 — 04:32 PM

You were right on the contexts. I changed to creating my own context and setting it on the view, plus calling the makeCurrentContext method and now I'm getting a nice 3.2 version back from OpenGL. Excellent. Thanks.

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