NSOpenGLPixelFormat

@interface NSOpenGLPixelFormat : NSObject <NSCoding>

 // Initializers

   - (id)initWithAttributes:(NSOpenGLPixelFormatAttribute*)attribs;

   - (id)initWithData:(NSData*)attribs;

 // Accessor Methods

   - (void)setAttributes:(NSData*)attribs;

   - (NSData*)attributes;

 // Instance Methods

   - (void)getValues:(long*)vals forAttribute:(NSOpenGLPixelFormatAttribute)attrib 
        forVirtualScreen:(int)screen;

   - (int)numberOfVirtualScreens;

 // Methods Implementing NSCoding

   - (void)encodeWithCoder:(NSCoder *)aCoder;

   - (id)initWithCoder:(NSCoder *)aDecoder;