# VkHdrMetadataEXT(3) Manual Page

## Name

VkHdrMetadataEXT - Specify HDR metadata

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## C Specification

The `VkHdrMetadataEXT` structure is defined as:

    // Provided by VK_EXT_hdr_metadata
    typedef struct VkHdrMetadataEXT {
        VkStructureType    sType;
        const void*        pNext;
        VkXYColorEXT       displayPrimaryRed;
        VkXYColorEXT       displayPrimaryGreen;
        VkXYColorEXT       displayPrimaryBlue;
        VkXYColorEXT       whitePoint;
        float              maxLuminance;
        float              minLuminance;
        float              maxContentLightLevel;
        float              maxFrameAverageLightLevel;
    } VkHdrMetadataEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `displayPrimaryRed` is a VkXYColorEXT structure specifying the red primary of the display used to optimize the content

- `displayPrimaryGreen` is a VkXYColorEXT structure specifying the green primary of the display used to optimize the content

- `displayPrimaryBlue` is a VkXYColorEXT structure specifying the blue primary of the display used to optimize the content

- `whitePoint` is a VkXYColorEXT structure specifying the white-point of the display used to optimize the content

- `maxLuminance` is the maximum luminance of the display used to optimize the content in nits

- `minLuminance` is the minimum luminance of the display used to optimize the content in nits

- `maxContentLightLevel` is the value in nits of the desired luminance for the brightest pixels in the displayed image.

- `maxFrameAverageLightLevel` is the value in nits of the average luminance of the frame which has the brightest average luminance anywhere in the content.

## Description

If any of the above values are unknown, they can be set to 0.

Note | The meta-data provided here is intended to be used as defined in the SMPTE 2086, CTA 861.3 and CIE 15:2004 specifications. The validity and use of this data is outside the scope of Vulkan.

Valid Usage (Implicit)

- VUID-VkHdrMetadataEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_HDR_METADATA_EXT`

- VUID-VkHdrMetadataEXT-pNext-pNext
  `pNext` must be `NULL` or a pointer to a valid instance of VkHdrVividDynamicMetadataHUAWEI

- VUID-VkHdrMetadataEXT-sType-unique
  The `sType` value of each structure in the `pNext` chain must be unique

## See Also

VK_EXT_hdr_metadata, VkStructureType, VkXYColorEXT, vkSetHdrMetadataEXT

## 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