kc3-lang/angle/extensions/ANGLE_platform_angle_vulkan.txt

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• Hash : 0448ec84
  Author :
  Date : 2016-12-23T13:41:47
  

  Vulkan: Enable validation layers on request.
  
  Also adds the build files for the Vulkan layers.
  
  The layers are enabled by default for the tests.
  
  BUG=angleproject:1319
  
  Change-Id: I0b442b36312a1299a932922e1c4e39f00801de49
  Reviewed-on: https://chromium-review.googlesource.com/367751
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• extensions/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 1, 2016-11-17
  
  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
  
      Accepted as an attribute name in the <attrib_list> argument of
      eglGetPlatformDisplayEXT:
  
          EGL_PLATFORM_ANGLE_ENABLE_VALIDATION_LAYER_ANGLE   0x3451
  
  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_ENABLE_VALIDATION_LAYER_ANGLE is specified, it
      controls enabling the standard Vulkan validation layers. EGL_TRUE enables
      the validation and EGL_FALSE disables it. Any value other than these will
      result in an error. If the flag is not specified, validation may default
      to either enabled or disabled, depending on compile-time parameters in the
      implementation.
  
      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) Would it be better to specify validation layers individually?
  
         RESOLVED: It would give more fined grained control, but the layers
         are sensitive to ordering, and there may be new ones added or old ones
         removed, this abstracts the logic into a simpler form. The validation
         layers maintainers are also moving towards a single-layer model from
         the current multiple layers approach.
  
      2) Should the validation layers default to on, off, or no guarantee?
  
         Defaulting to off offers some consistency. However, it's customary for
         some applications like ANGLE to turn on debugging features by default
         in Debug builds.
  
      3) 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
  

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