C Specification

The VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT structure is defined as:

// Provided by VK_EXT_shader_module_identifier
typedef struct VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT {
    VkStructureType    sType;
    void*              pNext;
    uint8_t            shaderModuleIdentifierAlgorithmUUID[VK_UUID_SIZE];
} VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT;


The members of the VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT structure describe the following:


  • shaderModuleIdentifierAlgorithmUUID is an array of VK_UUID_SIZE uint8_t values which uniquely represents the algorithm used to compute an identifier in vkGetShaderModuleIdentifierEXT and vkGetShaderModuleCreateInfoIdentifierEXT. Implementations should not change this value in different driver versions if the algorithm used to compute an identifier is the same.


The algorithm UUID may be the same in different ICDs if the algorithms are guaranteed to produce the same results. This may happen in driver stacks which support different kinds of hardware with shared code.

Khronos' conformance testing can not guarantee that shaderModuleIdentifierAlgorithmUUID values are actually unique, so implementors should make their own best efforts to ensure that their UUID is unlikely to conflict with other implementations which may use a different algorithm. In particular, hard-coded values which easily conflict, such as all-0 bits, should never be used. Hard-coded values are acceptable if best effort is ensured that the value will not accidentally conflict.

If the VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT structure is included in the pNext chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Valid Usage (Implicit)
  • VUID-VkPhysicalDeviceShaderModuleIdentifierPropertiesEXT-sType-sType

See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright 2014-2022 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0