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