Name

    SGIX_visual_select_group

Name Strings

    GLX_SGIX_visual_select_group

Contact

    David Gorgen, Silicon Graphics (dgorgen 'at' sgi.com)
    Wei Li, Silicon Graphics (weili 'at' sgi.com)

Status

    Complete

Version

    Last Modified Date: November 28, 2000
    Author Revision: 1.0
    $Date: 2000/11/28 10:27:39 $Revision: 1.0 $

Number

    234

Dependencies

    None

Overview

    This extension provides a mechanism to lower visual selection 
    priorities that glXChooseVisual or glXChooseFBConfig defines.  
    A new visual attribute is introduced, providing a way for servers
    to group visuals to different visual selection categories.
    The visual selection priorities of all the visuals in one category
    may be higher or lower than the ones in another category.  
    The visual selection priorities in one category follow the rules
    of glXChooseVisual or glXChooseFBConfig.  The new attribute is 
    invisible to users so can't be queried by glXGetConfig or 
    glXGetFBConfigAttrib.

IP Status

    TBD

Issues

    None

New Procedures and Functions

    None

New Tokens

    The token

        GLX_VISUAL_SELECT_GROUP_SGIX   0x8028

    is used to communicate between servers and GLX client.

Additions to Chapter 2 of the OpenGL 1.2.1 Specification (OpenGL Operation)

    None

Additions to Chapter 3 of the OpenGL 1.2.1 Specification (Rasterization)

    None

Additions to Chapter 4 of the OpenGL 1.2.1 Specification (Per-Fragment
Operations and the Frame Buffer)

    None

Additions to Chapter 5 of the OpenGL 1.2.1 Specification (Special Functions)

    None

Additions to Chapter 6 of the OpenGL 1.2.1 Specification (State and
State Requests)

    None

Additions to Appendix A of the OpenGL 1.2.1 Specification (Invariance)

    None

Additions to Chapter 2 of the GLX 1.3 Specification (GLX Operation)

    None

Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors)

    The attribute GLX_VISUAL_SELECT_GROUP_SGIX is used to specify the visual
    selection categories. Visuals in the i-th category have higher visual 
    selection priorities than the ones in (i+1)-th category.  If a matching 
    visual is found in the i-th category, glXChooseVisual will return 
    the best match and will not continue searching, while glXChooseFBConfig 
    will continue searching all the categories and will sort the matches 
    such that the matches in the i-th category are listed before the matches 
    in the (i+1)-th category in the matching list.

    The attribute GLX_VISUAL_SELECT_GROUP_SGIX is used for the communication
    between servers and GLX client.  It is not accepted by the <attrib_list>
    parameter of glXChooseVisual, or glXChooseFBConfig, or glXGetConfig, or
    glXGetFBConfigAttrib.

    All visuals which have no GLX_VISUAL_SELECT_GROUP_SGIX attribute behave 
    as though its value was zero.

Additions to Chapter 4 of the GLX 1.3 Specification (Encoding on the X
Byte Stream)

    None

Additions to Chapter 5 of the GLX 1.3 Specification (Extending OpenGL)

    None

Additions to Chapter 6 of the GLX 1.3 Specification (GLX Versions)

    None
 
GLX Protocol

    None

Errors

    None

New State

    None

New Implementation Dependent State 
   
    None

Revision History

    None