| Brian Paul | 8420ad9 | 2002-10-02 17:32:26 +0000 | [diff] [blame] | 1 | Name |
| 2 | |
| 3 | MESA_agp_offset |
| 4 | |
| 5 | Name Strings |
| 6 | |
| 7 | GLX_MESA_agp_offset |
| 8 | |
| 9 | Contact |
| 10 | |
| 11 | Brian Paul, Tungsten Graphics, Inc. (brian 'at' tungstengraphics.com) |
| 12 | Keith Whitwell, Tungsten Graphics, Inc. (keith 'at' tungstengraphics.com) |
| 13 | |
| 14 | Status |
| 15 | |
| 16 | Shipping (Mesa 4.0.4 and later. Only implemented in particular |
| 17 | XFree86/DRI drivers.) |
| 18 | |
| 19 | Version |
| 20 | |
| 21 | 1.0 |
| 22 | |
| 23 | Number |
| 24 | |
| 25 | TBD |
| 26 | |
| 27 | Dependencies |
| 28 | |
| 29 | OpenGL 1.0 or later is required |
| 30 | GLX_NV_vertex_array_range is required. |
| 31 | This extensions is written against the OpenGL 1.4 Specification. |
| 32 | |
| 33 | Overview |
| 34 | |
| 35 | This extensions provides a way to convert pointers in an AGP memory |
| 36 | region into byte offsets into the AGP aperture. |
| 37 | Note, this extension depends on GLX_NV_vertex_array_range, for which |
| 38 | no real specification exists. See GL_NV_vertex_array_range for more |
| 39 | information. |
| 40 | |
| 41 | IP Status |
| 42 | |
| 43 | None |
| 44 | |
| 45 | Issues |
| 46 | |
| 47 | None |
| 48 | |
| 49 | New Procedures and Functions |
| 50 | |
| 51 | GLuint glXGetAGPOffsetMESA( const GLvoid *pointer ) |
| 52 | |
| 53 | New Tokens |
| 54 | |
| 55 | None |
| 56 | |
| 57 | Additions to the OpenGL 1.4 Specification |
| 58 | |
| 59 | None |
| 60 | |
| 61 | Additions to Chapter 3 the GLX 1.4 Specification (Functions and Errors) |
| 62 | |
| 63 | Add a new section, 3.6 as follows: |
| 64 | |
| 65 | 3.6 AGP Memory Access |
| 66 | |
| 67 | On "PC" computers, AGP memory can be allocated with glXAllocateMemoryNV |
| 68 | and freed with glXFreeMemoryNV. Sometimes it's useful to know where a |
| 69 | block of AGP memory is located with respect to the start of the AGP |
| 70 | aperature. The function |
| 71 | |
| 72 | GLuint glXGetAGPOffsetMESA( const GLvoid *pointer ) |
| 73 | |
| 74 | Returns the offset of the given memory block from the start of AGP |
| 75 | memory in basic machine units (i.e. bytes). If pointer is invalid |
| 76 | the value ~0 will be returned. |
| 77 | |
| 78 | GLX Protocol |
| 79 | |
| 80 | None. This is a client side-only extension. |
| 81 | |
| 82 | Errors |
| 83 | |
| 84 | glXGetAGPOffsetMESA will return ~0 if the pointer does not point to |
| 85 | an AGP memory region. |
| 86 | |
| 87 | New State |
| 88 | |
| 89 | None |
| 90 | |
| 91 | Revision History |
| 92 | |
| 93 | 20 September 2002 - Initial draft |
| 94 | 2 October 2002 - finished GLX chapter 3 additions |