# vkGetPipelineKeyKHR(3) Manual Page

## Name

vkGetPipelineKeyKHR - Generate the pipeline key from pipeline creation info

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## C Specification

To generate the key for a particular pipeline creation info, call:

    // Provided by VK_KHR_pipeline_binary
    VkResult vkGetPipelineKeyKHR(
        VkDevice                                    device,
        const VkPipelineCreateInfoKHR*              pPipelineCreateInfo,
        VkPipelineBinaryKeyKHR*                     pPipelineKey);

## Parameters

- `device` is the logical device that creates the pipeline object.

- `pPipelineCreateInfo` is `NULL` or a pointer to a VkPipelineCreateInfoKHR structure.

- `pPipelineKey` is a pointer to a VkPipelineBinaryKeyKHR structure in which the resulting key is returned.

## Description

If `pPipelineCreateInfo` is `NULL`, then the implementation must return the global key that applies to all pipelines. If the key obtained in this way changes between saving and restoring data obtained from vkGetPipelineBinaryDataKHR in a different VkDevice, then the application must assume that the restored data is invalid and cannot be passed to vkCreatePipelineBinariesKHR. Otherwise the application can assume the data is still valid.

If `pPipelineCreateInfo` is not `NULL`, the key obtained functions as a method to compare two pipeline creation info structures. Implementations may not compare parts of a pipeline creation info which would not contribute to the final binary output. If a shader module identifier is used instead of a shader module, the `pPipelineKey` generated must be equal to the key generated when using the shader module from which the identifier was queried. If the content of two `pPipelineKey` are equal, pipelines created with the two `pPipelineCreateInfo->pNext` create infos must produce the same VkPipelineBinaryKHR contents.

The pipeline key is distinct from pipeline binary key. Pipeline binary keys can only be obtained after compilation. The pipeline key is intended to optionally allow associating pipeline create info with multiple pipeline binary keys.

Valid Usage

- VUID-vkGetPipelineKeyKHR-pNext-09605
  The `pNext` chain of `pPipelineCreateInfo` must not set VkPipelineBinaryInfoKHR::`binaryCount` to a value greater than `0`

Valid Usage (Implicit)

- VUID-vkGetPipelineKeyKHR-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkGetPipelineKeyKHR-pPipelineCreateInfo-parameter
  If `pPipelineCreateInfo` is not `NULL`, `pPipelineCreateInfo` must be a valid pointer to a valid VkPipelineCreateInfoKHR structure

- VUID-vkGetPipelineKeyKHR-pPipelineKey-parameter
  `pPipelineKey` must be a valid pointer to a VkPipelineBinaryKeyKHR structure

Return Codes

On success, this command returns

  - `VK_SUCCESS`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

## See Also

VK_KHR_pipeline_binary, VkDevice, VkPipelineBinaryKeyKHR, VkPipelineCreateInfoKHR

## 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

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0