// Copyright (c) 2017-2019 Khronos Group. This work is licensed under a
// Creative Commons Attribution 4.0 International License; see
// http://creativecommons.org/licenses/by/4.0/

include::meta/VK_KHR_vulkan_memory_model.txt[]

*Last Modified Date*::
    2018-12-10
*IP Status*::
    No known IP claims.
*Interactions and External Dependencies*::
  - This extension requires
    https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_vulkan_memory_model.html[`SPV_KHR_vulkan_memory_model`]
*Contributors*::
  - Jeff Bolz, NVIDIA
  - Alan Baker, Google
  - Tobias Hector, AMD
  - David Neto, Google
  - Robert Simpson, Qualcomm Technologies, Inc.
  - Brian Sumner, AMD

The `VK_KHR_vulkan_memory_model` extension allows use of the
<<memory-model,Vulkan Memory Model>>, which formally defines how to
synchronize memory accesses to the same memory locations performed by
multiple shader invocations.

=== New Enum Constants

  * Extending elink:VkStructureType:
  ** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_MEMORY_MODEL_FEATURES_KHR

=== New Structures

  * slink:VkPhysicalDeviceVulkanMemoryModelFeaturesKHR

[NOTE]
.Note
====
Version 3 of the spec added a member
(pname:vulkanMemoryModelAvailabilityVisibilityChains) to
slink:VkPhysicalDeviceVulkanMemoryModelFeaturesKHR, which is an incompatible
change from version 2.
====

=== New SPIR-V Capabilities

  * <<spirvenv-capabilities-table-memorymodel,code:VulkanMemoryModelKHR>>

=== Issues

=== Version History

  * Revision 1, 2018-06-24 (Jeff Bolz)
    - Initial draft