EGL_ANGLE_platform_angle_vulkan.txt

Name

    ANGLE_platform_angle_vulkan

Name Strings

    EGL_ANGLE_platform_angle_vulkan

Contributors

    Jamie Madill, Google

Contacts

    Jamie Madill, Google (jmadill 'at' google 'dot' com)

Status

    Draft

Version

    Version 2, 2017-07-19

Number

    EGL Extension XXX

Extension Type

    EGL client extension

Dependencies

    Requires ANGLE_platform_angle.

Overview

    This extension enables selection of Vulkan display types.

New Types

    None

New Procedures and Functions

    None

New Tokens

    Accepted as values for the EGL_PLATFORM_ANGLE_TYPE_ANGLE attribute:

        EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE               0x3450

Additions to the EGL Specification

    None.

New Behavior

    To request a display that is backed by a Vulkan driver, the value of
    EGL_PLATFORM_ANGLE_TYPE_ANGLE should be
    EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE.

    If EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE and
    EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE are not specified, the
    implementation will decide which version of Vulkan to instantiate. If they
    are specified, it will choose a version that is lower or equal to the
    specified major and minor versions. The only current values accepted for
    major and minor version are 1 for major and 0 for minor.

Issues

    1) Should ANGLE always instantiate the highest available version of Vulkan?

       RESOLVED: It's possible that in a future implementation of Vulkan there
       may be driver issues present only on some version of Vulkan, and there's
       no explicit guarantee higher versions will be more stable. Hence, we should
       give ANGLE some flexiblity in this regard and leave this unspecified.

Revision History

    Version 1, 2016-11-17 (Jamie Madill)
      - Initial draft
    Version 2, 2017-07-19 (Jamie Madill)
      - Moved debug layer control to EGL_ANGLE_platform_angle