OpenXR Specification (Source) 1.0.18

OpenXR Specification 1.0.18 (2021-07-30)

The main changes in this release include clarifications to the Session chapter
of the specification, plus the addition of diagrams to the text describing grip
and aim pose. The release also adds one new ratified KHR extension (promoted
from a vendor extension), and a number of new vendor extensions.

• Registry
  • Add ratified XR_KHR_swapchain_usage_input_attachment_bit Khronos extension.
    (Promotion of XR_MND_swapchain_usage_input_attachment_bit, which is now
    deprecated.)
    (internal MR 2045)
  • Add new XR_FB_foveation, XR_FB_foveation_configuration, and
    XR_FB_foveation_vulkan vendor extensions.
    (internal MR 2050)
  • Add additional extension dependencies to XR_FB_swapchain_update_state.
    (internal MR 2072,
    internal issue 1572)
  • Add new XR_FB_composition_layer_secure_content vendor extension.
    (internal MR 2075)
  • Add new XR_FB_composition_layer_alpha_blend vendor extension.
    (internal MR 2078)
  • Add new XR_FB_composition_layer_image_layout vendor extension.
    (internal MR 2090)
  • Add new XR_MSFT_spatial_anchor_persistence vendor extension.
    (internal MR 2093)
  • Add some simple Schematron rules and a script to
    check the XML registry against them.
    (internal MR 2103)
  • Register author ID and reserve vendor extensions for Unity.
    (internal MR 2105)
  • Reserve extension ID range 187-196 for LIV Inc.
    (internal MR 2102)
• Specification
  • Rewrite the introduction of Session chapter to explain a typical session
    lifecycle.
    (internal MR 2087)
  • Add grip diagram to specification
    (internal MR 2092,
    internal issue 1545,
    OpenXR-Docs PR 45,
    OpenXR-Docs issue 44)
  • Describe how runtimes may register themselves at installation time for manual
    selection.
    (internal MR 2081,
    internal MR 2109,
    internal issue 1574)
  • Document new ratified XR_KHR_swapchain_usage_input_attachment_bit Khronos
    extension. (Promotion of XR_MND_swapchain_usage_input_attachment_bit, which
    is now deprecated.)
    (internal MR 2045)
  • Document new XR_FB_foveation, XR_FB_foveation_configuration, and
    XR_FB_foveation_vulkan vendor extensions.
    (internal MR 2050)
  • Document new XR_FB_composition_layer_secure_content vendor extension.
    (internal MR 2075)
  • Document new XR_FB_composition_layer_alpha_blend vendor extension.
    (internal MR 2078)
  • Document new XR_FB_composition_layer_image_layout vendor extension.
    (internal MR 2090)
  • Document new XR_MSFT_spatial_anchor_persistence vendor extension.
    (internal MR 2093)
  • Minor cleanups to the loader documentation/specification.
    (internal MR 2108)
  • Revise Varjo vendor extensions so that the sample code is buildable (and build
    during CI testing).
    (internal MR 2020)
  • Scripts: Verify externsync attributes of destroy calls.
    (internal MR 2065)
  • Update XR_MSFT_spatial_anchor to note the external sync requirements of the
    destroy call.
    (internal MR 2065)
  • Add missing copyright/license notice for FB extension sources
    (internal MR 2076,
    internal issue 1562)
  • Add missing item to new enum constants of spatial anchors extension
    (internal MR 2088)
  • scripts: Handle aliased bitmask values properly in header files.
    (internal MR 2045)