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+Name
+
+    MESA_agp_offset
+
+Name Strings
+
+    GLX_MESA_agp_offset
+
+Contact
+
+    Brian Paul, Tungsten Graphics, Inc. (brian.paul 'at' tungstengraphics.com)
+    Keith Whitwell, Tungsten Graphics, Inc.  (keith 'at' tungstengraphics.com)
+
+Status
+
+    Shipping (Mesa 4.0.4 and later.  Only implemented in particular
+    XFree86/DRI drivers.)
+
+Version
+
+    1.0
+
+Number
+
+    TBD
+
+Dependencies
+
+    OpenGL 1.0 or later is required
+    GLX_NV_vertex_array_range is required.
+    This extensions is written against the OpenGL 1.4 Specification.
+
+Overview
+
+    This extensions provides a way to convert pointers in an AGP memory
+    region into byte offsets into the AGP aperture.
+    Note, this extension depends on GLX_NV_vertex_array_range, for which
+    no real specification exists.  See GL_NV_vertex_array_range for more
+    information.
+
+IP Status
+
+    None
+
+Issues
+
+    None
+
+New Procedures and Functions
+
+    unsigned int glXGetAGPOffsetMESA( const void *pointer )
+
+New Tokens
+
+    None
+
+Additions to the OpenGL 1.4 Specification
+
+    None
+
+Additions to Chapter 3 the GLX 1.4 Specification (Functions and Errors)
+
+    Add a new section, 3.6 as follows:
+
+    3.6 AGP Memory Access
+
+    On "PC" computers, AGP memory can be allocated with glXAllocateMemoryNV
+    and freed with glXFreeMemoryNV.  Sometimes it's useful to know where a
+    block of AGP memory is located with respect to the start of the AGP
+    aperture.  The function
+
+        GLuint glXGetAGPOffsetMESA( const GLvoid *pointer )
+
+    Returns the offset of the given memory block from the start of AGP
+    memory in basic machine units (i.e. bytes).  If pointer is invalid
+    the value ~0 will be returned.
+
+GLX Protocol
+
+    None.  This is a client side-only extension.
+
+Errors
+
+    glXGetAGPOffsetMESA will return ~0 if the pointer does not point to
+    an AGP memory region.
+
+New State
+
+    None
+
+Revision History
+
+    20 September 2002 - Initial draft
+    2 October 2002 - finished GLX chapter 3 additions
+    27 July 2004 - use unsigned int instead of GLuint, void instead of GLvoid