Name

    ANGLE_keyed_mutex

Name Strings

    EGL_ANGLE_keyed_mutex

Contributors

    Jeff Muizelaar

Contacts

    Jeff Muizelaar, Mozilla (jmuizelaar 'at' mozilla.org)

Status

    Implemented in ANGLE.

Version

    Version 1, Oct 29, 2014

Number

    EGL Extension #??

Dependencies

    Requires the EGL_ANGLE_query_surface_pointer extension.

    This extension is written against the wording of the EGL 1.4
    Specification.

Overview

    Some EGL implementations generate EGLSurface handles that are
    backed by Direct3D 11 2D textures.  This extension allows
    obtaining the IDXGIKeyedMutex for such EGL surfaces.

New Types

    None

New Procedures and Functions

    None

New Tokens

    Accepted in the <attribute> parameter of eglQuerySurfacePointerANGLE:

        EGL_DXGI_KEYED_MUTEX_ANGLE                       0x33A2

    Add to table 3.5, "Queryable surface attributes and types":

        Attribute                              Type      Description
        ---------                              ----      -----------
        EGL_DXGI_KEYED_MUTEX_ANGLE             pointer   IDXGIKeyedMutex

    Add before the last paragraph in section 3.5, "Surface attributes":

        "Querying EGL_DXGI_KEYED_MUTEX_ANGLE returns a IDXGIKeyedMutex, or NULL
        if a keyed mutex for the surface is not available.  The keyed mutex
        must be queried using eglQuerySurfaceAttribPointerANGLE.  Keyed Mutexes
        are only available from EGL surfaces backed by Direct3D 11 surfaces.
        Before using the keyed mutex, ensure that all rendering to the EGLSurface
        with EGL client APIs has completed."

Issues

Revision History

    Version 1, 2014/10/29 - first draft.