Add OpenGL support

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@14997 72102866-910b-0410-8b05-ffd578937521

Source/NSOpenGLContext.m

@@ -0,0 +1,171 @@
+/** <title>NSOpenGLContext.m </title>
+
+   <abstract>Context for openGL drawing</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 Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this library; see the file COPYING.LIB.
+   If not, write to the Free Software Foundation,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include <Foundation/NSDebug.h>
+#include <AppKit/NSOpenGL.h>
+#include <AppKit/GSDisplayServer.h>
+
+
+@implementation NSOpenGLContext
++ _classContext
+{
+  Class glContextClass = [GSCurrentServer() glContextClass];
+
+  if ( glContextClass == nil )
+    {
+      NSWarnMLog(@"Backend doesn't have any gl context");
+      return nil;
+    }
+  else
+    {
+      NSDebugMLLog(@"GLX", @"found something");
+      return glContextClass;
+    }
+}
+
+
++ allocWithZone: (NSZone *) z
+{
+  Class c = [self _classContext];
+  if ( c )
+    return NSAllocateObject(c, 0, z);
+  else
+    return nil;
+}
+
++ (void)clearCurrentContext
+{
+  [[self _classContext] clearCurrentContext];
+}
+
++ (NSOpenGLContext *)currentContext
+{
+  return [[self _classContext] currentContext];
+}
+
+- (void)clearDrawable
+{
+  [self subclassResponsibility: _cmd];
+}
+
+- (void)copyAttributesFromContext:(NSOpenGLContext *)context 
+			 withMask:(unsigned long)mask
+{
+  [self subclassResponsibility: _cmd];
+}
+
+- (void)createTexture:(unsigned long)target 
+	     fromView:(NSView*)view 
+       internalFormat:(unsigned long)format
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (int)currentVirtualScreen
+{
+  [self subclassResponsibility: _cmd];
+  return 0;
+}
+
+
+- (void)flushBuffer
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)getValues:(long *)vals 
+     forParameter:(NSOpenGLContextParameter)param
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (id)initWithFormat:(NSOpenGLPixelFormat *)format 
+	shareContext:(NSOpenGLContext *)share
+{
+  [self subclassResponsibility: _cmd];
+  return 0;
+}
+
+
+
+- (void)makeCurrentContext
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)setCurrentVirtualScreen:(int)screen
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)setFullScreen
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)setOffScreen:(void *)baseaddr 
+	       width:(long)width 
+	      height:(long)height 
+	    rowbytes:(long)rowbytes
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)setValues:(const long *)vals 
+     forParameter:(NSOpenGLContextParameter)param
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)setView:(NSView *)view
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (void)update
+{
+  [self subclassResponsibility: _cmd];
+}
+
+
+- (NSView *)view
+{
+  [self subclassResponsibility: _cmd];
+  return nil;
+}
+@end
+
+