/** <title>NSOpenGLPixelFormat.m </title>

   <abstract>use to choose the type of GL context</abstract>

   Copyright (C) 1996 Free Software Foundation, Inc.

   Author:  Frederic De Jaeger
   Date: 2002

   This file is part of the GNUstep GUI Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; see the file COPYING.LIB.
   If not, see <http://www.gnu.org/licenses/> or write to the 
   Free Software Foundation, 51 Franklin Street, Fifth Floor, 
   Boston, MA 02110-1301, USA.
*/

#import <Foundation/NSString.h>
#import <Foundation/NSData.h>
#import <Foundation/NSDebug.h>
#import "AppKit/NSOpenGL.h"
#import "GNUstepGUI/GSDisplayServer.h"

@implementation NSOpenGLPixelFormat

+ (Class) _classPixelFormat
{
  Class glPixelFormatClass = [GSCurrentServer() glPixelFormatClass];

  if (glPixelFormatClass == nil)
    {
      NSWarnMLog(@"Backend doesn't have any glPixelFormatClass");
      return nil;
    }
  else
    {
      NSDebugMLLog(@"GLX", @"found a class %@", glPixelFormatClass);
      return glPixelFormatClass;
    }
}

+ (id) allocWithZone: (NSZone*) z
{
  Class c = [self _classPixelFormat];
  if (c)
    return NSAllocateObject(c, 0, z);
  else
    return nil;
}

- (void) getValues: (int*)vals 
      forAttribute: (NSOpenGLPixelFormatAttribute)attrib 
  forVirtualScreen: (int)screen
{
  [self subclassResponsibility: _cmd];
}

- (id) initWithAttributes: (NSOpenGLPixelFormatAttribute*)attribs
{
  [self subclassResponsibility: _cmd];
  return nil;
}

- (int) numberOfVirtualScreens
{
  [self subclassResponsibility: _cmd];
  return 0;
}

- (id) initWithCoder: (NSCoder*)aDecoder
{
  if ([aDecoder allowsKeyedCoding])
    {
      NSMutableData *attrs = [aDecoder decodeObjectForKey: @"NSPixelAttributes"];

      if (attrs != nil)
        {
          NSOpenGLPixelFormatAttribute *glattrs;
          unsigned char tmp = 0;

          // Ensure that it is zero-terminated
          [attrs appendBytes: &tmp length: sizeof(tmp)];
          // FIXME: Deserialize an integer array
          glattrs = (NSOpenGLPixelFormatAttribute *)[attrs mutableBytes];

          return [self initWithAttributes: glattrs];
        }
    }
  else
    {
    }

  return self;
}

- (void) encodeWithCoder: (NSCoder*)aCoder
{
  [self subclassResponsibility: _cmd];
}

@end