# VkImageViewASTCDecodeModeEXT(3) Manual Page

## Name

VkImageViewASTCDecodeModeEXT - Structure describing the ASTC decode mode for an image view

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## C Specification

If the `pNext` chain includes a `VkImageViewASTCDecodeModeEXT` structure, then that structure includes a parameter specifying the decode mode for image views using ASTC compressed formats.

The `VkImageViewASTCDecodeModeEXT` structure is defined as:

    // Provided by VK_EXT_astc_decode_mode
    typedef struct VkImageViewASTCDecodeModeEXT {
        VkStructureType    sType;
        const void*        pNext;
        VkFormat           decodeMode;
    } VkImageViewASTCDecodeModeEXT;

## Members

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

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

- `decodeMode` is the intermediate format used to decode ASTC compressed formats.

## Description

Valid Usage

- VUID-VkImageViewASTCDecodeModeEXT-decodeMode-02230
  `decodeMode` must be one of `VK_FORMAT_R16G16B16A16_SFLOAT`, `VK_FORMAT_R8G8B8A8_UNORM`, or `VK_FORMAT_E5B9G9R9_UFLOAT_PACK32`

- VUID-VkImageViewASTCDecodeModeEXT-decodeMode-02231
  If the `decodeModeSharedExponent` feature is not enabled, `decodeMode` must not be `VK_FORMAT_E5B9G9R9_UFLOAT_PACK32`

- VUID-VkImageViewASTCDecodeModeEXT-decodeMode-02232
  If `decodeMode` is `VK_FORMAT_R8G8B8A8_UNORM` the image view must not include blocks using any of the ASTC HDR modes

- VUID-VkImageViewASTCDecodeModeEXT-format-04084
  `format` of the image view must be one of the ASTC Compressed Image Formats

If `format` uses sRGB encoding then the `decodeMode` has no effect.

Valid Usage (Implicit)

- VUID-VkImageViewASTCDecodeModeEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_IMAGE_VIEW_ASTC_DECODE_MODE_EXT`

- VUID-VkImageViewASTCDecodeModeEXT-decodeMode-parameter
  `decodeMode` must be a valid VkFormat value

## See Also

VK_EXT_astc_decode_mode, VkFormat, VkStructureType

## 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