# VkPipelineCacheHeaderVersionDataGraphQCOM(3) Manual Page

## Name

VkPipelineCacheHeaderVersionDataGraphQCOM - Structure describing the layout of the pipeline cache header for data graphs

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## C Specification

The data graph pipeline cache header is defined as:

    // Provided by VK_QCOM_data_graph_model
    typedef struct VkPipelineCacheHeaderVersionDataGraphQCOM {
        uint32_t                         headerSize;
        VkPipelineCacheHeaderVersion     headerVersion;
        VkDataGraphModelCacheTypeQCOM    cacheType;
        uint32_t                         cacheVersion;
        uint32_t                         toolchainVersion[VK_DATA_GRAPH_MODEL_TOOLCHAIN_VERSION_LENGTH_QCOM];
    } VkPipelineCacheHeaderVersionDataGraphQCOM;

## Members

- `headerSize` is the length in bytes of the pipeline cache header.

- `headerVersion` is a VkPipelineCacheHeaderVersion value specifying the version of the header. A consumer of the pipeline cache should use the cache version to interpret the remainder of the cache header. `headerVersion` must be written as exactly 4 bytes.

- `cacheType` is the VkDataGraphModelCacheTypeQCOM type of data graph cache encoded in the data.

- `cacheVersion` is the version of the encoding of the data graph cache.

- `toolchainVersion` is the version of the compiler that built the data graph cache.

## Description

The application should verify that the header info is compatible with the VkDataGraphProcessingEngineCreateInfoARM passed during pipeline creation. Implementations may return `VK_PIPELINE_COMPILE_REQUIRED_EXT` from vkCreateDataGraphPipelinesARM if the cache is not compatible.

Note | This cache type is built using offline compilation, therefore Vulkan does not define engine compatibility. The application should refer to the offline compiler used to create the cache for guidance on compatibility.

Unlike most structures declared by the Vulkan API, all fields of this structure are written with the least significant byte first, regardless of host byte-order.

The C language specification does not define the packing of structure members. This layout assumes tight structure member packing, with members laid out in the order listed in the structure, and the intended size of the structure is 28 bytes. If a compiler produces code that diverges from that pattern, applications must employ another method to set values at the correct offsets.

Valid Usage

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-None-11835
  The dataGraphModel feature must be enabled

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-headerSize-11836
  `headerSize` must be 28

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-headerVersion-11837
  `headerVersion` must be `VK_PIPELINE_CACHE_HEADER_VERSION_DATA_GRAPH_QCOM`

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-headerSize-11838
  `headerSize` must not exceed the size of the pipeline cache

Valid Usage (Implicit)

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-headerVersion-parameter
  `headerVersion` must be a valid VkPipelineCacheHeaderVersion value

- VUID-VkPipelineCacheHeaderVersionDataGraphQCOM-cacheType-parameter
  `cacheType` must be a valid VkDataGraphModelCacheTypeQCOM value

## See Also

VK_QCOM_data_graph_model, VkDataGraphModelCacheTypeQCOM, VkPipelineCacheHeaderVersion

## 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