# VkSpecializationMapEntry(3) Manual Page

## Name

VkSpecializationMapEntry - Structure specifying a specialization map entry

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## C Specification

The `VkSpecializationMapEntry` structure is defined as:

    // Provided by VK_VERSION_1_0
    typedef struct VkSpecializationMapEntry {
        uint32_t    constantID;
        uint32_t    offset;
        size_t      size;
    } VkSpecializationMapEntry;

## Members

- `constantID` is the ID of the specialization constant in SPIR-V.

- `offset` is the byte offset of the specialization constant value within the supplied data buffer.

- `size` is the byte size of the specialization constant value within the supplied data buffer.

## Description

If a `constantID` value is not a specialization constant ID used in the shader, that map entry does not affect the behavior of the pipeline.

Valid Usage

- VUID-VkSpecializationMapEntry-constantID-00776
  For a `constantID` specialization constant declared in a shader, `size` must match the byte size of the `constantID`. If the specialization constant is of type `boolean`, `size` must be the byte size of VkBool32

## See Also

VK_VERSION_1_0, VkSpecializationInfo

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0