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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
GLuint glXGetAGPOffsetMESA( const GLvoid *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
aperature. 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
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