Name

    GLX_OML_swap_method

Name Strings

    GLX_OML_swap_method

Contact

    Jon Leech, SGI (ljp 'at' sgi.com)

Status

    Complete. Approved by the Khronos SIG on July 19, 2001.

Version

    Last Modified Date: 07/23/2001
    Revision: $Header: //depot/main/doc/registry/extensions/OML/glx_swap_method.spec#4 $

Number

    237

Dependencies

    GLX 1.3 is required.

Overview

    This extension adds a new attribute, GLX_SWAP_METHOD, for a
    GLXFBConfig. The GLX_SWAP_METHOD indicates how front and back
    buffers are swapped when the GLXFBConfig is double-buffered.

IP Status

    No known issues.

Issues and Notes

  * Some hardware supports different swap methods in full screen mode
    vs. windowed mode. How should this be handled? This is not handled
    by this extension. GLX does not support the notion of fullscreen vs.
    windowed mode. A separate extension is required to properly support
    fullscreen mode.

New Procedures and Functions

    None.

New Tokens

    Accepted in the <attrib_list> parameter array of glXChooseFBConfig
    and as the <attribute> parameter for glXGetFBConfigAttrib:

	GLX_SWAP_METHOD_OML		    0x8060

Accepted as a value in the <attrib_list> parameter of glXChooseFBConfig
and returned in the <value> parameter of glXGetFBConfig:

	GLX_SWAP_EXCHANGE_OML		    0x8061
	GLX_SWAP_COPY_OML		    0x8062
	GLX_SWAP_UNDEFINED_OML		    0x8063

Additions to the OpenGL 1.2.1 Specification

    None

Additions to the GLX 1.3 Specification

  - (3.3.3, p. ?? "Configuration Management")

    Add to table 3.1:

    Attribute		 Type Notes
    ---------		 ---- -----
    GLX_SWAP_METHOD_OML  enum method used to swap front and back color buffers


    The GLX_SWAP_METHOD_OML attribute may be set to one of the following
    values: GLX_SWAP_EXCHANGE_OML, GLX_SWAP_COPY_OML or
    GLX_SWAP_UNDEFINED_OML. If this attribute is set to
    GLX_SWAP_EXCHANGE_OML then swapping exchanges the front and back
    buffer contents; if the attribute is set to GLX_SWAP_COPY_OML then
    swapping copies the back buffer contents to the front buffer,
    preserving the back buffer contents; if it is set to
    GLX_SWAP_UNDEFINED_OML then the back buffer contents are copied to
    the front buffer but the back buffer contents are undefined after
    the operation. If the GLXFBConfig does not support a back buffer,
    then the value of GLX_SWAP_METHOD_OML is set to
    GLX_SWAP_UNDEFINED_OML.

    Add to table 3.4:

    Attribute		Default		Selection and Sorting	Sort Priority
					Criteria
    ---------		-------		---------------------	-------------
    GLX_SWAP_METHOD_OML GLX_DONT_CARE	Exact			???

New State

    None

New Implementation Dependent State

    None

Revision History

    Revision 4, 07/24/2001 - Finalized Status for OpenML 1.0.
    Revision 3, 07/11/2001 - Assign enum values.
    Revision 2, 07/11/2001 - Assign extension numbers for the registry.
    Revision 1 - change Paula's draft to use OML affix.