EGL_ANGLE_global_fence_sync.txt

Name

    ANGLE_global_fence_sync

Name Strings

    EGL_ANGLE_global_fence_sync

Contributors

    Shahbaz Youssefi, Google

Contacts

    Shahbaz Youssefi, Google (syoussefi 'at' google.com)

Status

    Draft

Version

    Version 1, 2024-02-13

Number

    EGL Extensions XXX

Extension Type

    EGL display extension

Dependencies

    This extension is written against the wording of the EGL 1.5
    Specification.

Overview

    This extension enables the creation of EGL fence sync objects that
    synchronize with all past submissions of all contexts.  Normally, if two
    contexts make submissions, even on the same thread, the inserted fence sync
    only guarantees synchronization with the submissions from the context in
    which the fence was inserted.  With the new fence sync type introduced by
    this extension, the application can synchronize with both contexts in this
    example using a single fence.

New Types

    None.

New Procedures and Functions

    None.

New Tokens

    Accepted by the <type> parameter of eglCreateSync, and returned
    in <value> when eglGetSyncAttrib is called with <attribute>
    EGL_SYNC_TYPE:

    EGL_SYNC_GLOBAL_FENCE_ANGLE                         0x34DE

Additions to the EGL Specification

    Add the following after the second paragraph of Section 3.8.1.1 (Creating
    Fence Sync Objects),

    "If <type> is EGL_SYNC_GLOBAL_FENCE_ANGLE, behavior is identical to
    EGL_SYNC_FENCE except that synchronization is additionally done with all
    previously submitted commands by all contexts."

    In the Errors of eglCreateSync, replace all instances of "If type is
    EGL_SYNC_FENCE" with "If type is EGL_SYNC_FENCE or
    EGL_SYNC_GLOBAL_FENCE_ANGLE".

Issues

    None.

Revision History

    Version 1, 2024-02-13
      - Initial draft