Major check-in of changes for GL_EXT_framebuffer_object extension.

Main driver impacts:
- new code for creating the Mesa GLframebuffer
- new span/pixel read/write code
Some drivers not yet updated/tested.

src/mesa/swrast/s_span.h

@@ -2,7 +2,7 @@
  * Mesa 3-D graphics library
  * Version:  6.3
  *
- * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -60,11 +60,11 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span);
 
 
 extern void
-_swrast_read_rgba_span( GLcontext *ctx, GLframebuffer *buffer,
+_swrast_read_rgba_span( GLcontext *ctx, struct gl_renderbuffer *rb,
                         GLuint n, GLint x, GLint y, GLchan rgba[][4] );
 
 extern void
-_swrast_read_index_span( GLcontext *ctx, GLframebuffer *buffer,
+_swrast_read_index_span( GLcontext *ctx, struct gl_renderbuffer *rb,
                          GLuint n, GLint x, GLint y, GLuint indx[] );
 
 #endif