Re: CAOpenGLLayer

FROM : John Harper
DATE : Wed Apr 02 22:19:07 2008

Hi,

yes, that seems like a good solution,

   John


On Apr 2, 2008, at 12:23 PM, Stefan Hafeneger wrote:
> Hi John,
>
> I now setup the environment in copyCGLContextForPixelFormat. The 
> folling code seemd to work fine. Do you see anything that would 
> create a crash or is this okay? The code should work if the view 
> moves from one screen to another, shouldn't it?
>
> [CODE]
> - (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask {
>     CGLPixelFormatAttribute attributes[] =
>     {
>         kCGLPFADisplayMask, mask,
>         kCGLPFAAccelerated,
>         kCGLPFAColorSize, 24,
>         kCGLPFAAlphaSize, 8,
>         kCGLPFADepthSize, 16,
>         kCGLPFANoRecovery,
>         kCGLPFAMultisample,
>         kCGLPFASupersample,
>         kCGLPFASampleAlpha,
>         0
>     };
>     CGLPixelFormatObj pixelFormatObj = NULL;
>     GLint numPixelFormats = 0;
>     CGLChoosePixelFormat(attributes, &pixelFormatObj, &numPixelFormats);
>     if(pixelFormatObj == NULL)
>         NSLog(@"Error: Could not choose pixel format!");
>     return pixelFormatObj;
> }
>
> - (void)releaseCGLPixelFormat:(CGLPixelFormatObj)pixelFormat {
>     CGLDestroyPixelFormat(pixelFormat);
> }
>
> - (CGLContextObj)copyCGLContextForPixelFormat:
> (CGLPixelFormatObj)pixelFormat {
>     CGLContextObj contextObj = NULL;
>     CGLCreateContext(pixelFormat, NULL, &contextObj);
>     if(contextObj == NULL)
>         NSLog(@"Error: Could not create context!");
>     
>     CGLSetCurrentContext(contextObj);
>     
>     //
>     // Setup OpenGL environment.
>     //
>     
>     return contextObj;
> }
>
> - (void)releaseCGLContext:(CGLContextObj)glContext {
>     
>     //
>     // Clean up OpenGL environment.
>     //
>     
>     CGLDestroyContext(glContext);
> }
> [/CODE]
>
> With best wishes, Stefan