# VkDecompressMemoryInfoEXT(3) Manual Page

## Name

VkDecompressMemoryInfoEXT - Structure specifying decompression memory info

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## C Specification

The `VkDecompressMemoryInfoEXT` structure is defined as:

    // Provided by VK_EXT_memory_decompression
    typedef struct VkDecompressMemoryInfoEXT {
        VkStructureType                        sType;
        const void*                            pNext;
        VkMemoryDecompressionMethodFlagsEXT    decompressionMethod;
        uint32_t                               regionCount;
        const VkDecompressMemoryRegionEXT*     pRegions;
    } VkDecompressMemoryInfoEXT;

## Members

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

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

- `decompressionMethod` is a bitmask of VkMemoryDecompressionMethodFlagBitsEXT with a single bit set specifying the method used to decompress data.

- `regionCount` is the number of regions to decompress.

- `pRegions` is a pointer to an array of VkDecompressMemoryRegionEXT structures specifying the regions to decompress.

## Description

Each memory region specified in `pRegions` is decompressed from the source to the destination address based on the decompression method specified in `decompressionMethod`. If any of the specified source and destination regions overlap in memory, then the results of decompression are undefined.

Valid Usage

- VUID-VkDecompressMemoryInfoEXT-decompressionMethod-07690
  The `decompressionMethod` must have a single bit set

- VUID-VkDecompressMemoryInfoEXT-decompressionMethod-11762
  If `decompressionMethod` is `VK_MEMORY_DECOMPRESSION_METHOD_GDEFLATE_1_0_BIT_EXT`, then for each element of `pRegions`, `decompressedSize` must be less than or equal to 65536 bytes

- VUID-VkDecompressMemoryInfoEXT-decompressionMethod-11763
  `decompressionMethod` must be a valid bit specified in `VkPhysicalDeviceMemoryDecompressionPropertiesEXT`::`decompressionMethods`

Valid Usage (Implicit)

- VUID-VkDecompressMemoryInfoEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_DECOMPRESS_MEMORY_INFO_EXT`

- VUID-VkDecompressMemoryInfoEXT-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkDecompressMemoryInfoEXT-decompressionMethod-parameter
  `decompressionMethod` must be a valid combination of VkMemoryDecompressionMethodFlagBitsEXT values

- VUID-VkDecompressMemoryInfoEXT-decompressionMethod-requiredbitmask
  `decompressionMethod` must not be `0`

- VUID-VkDecompressMemoryInfoEXT-pRegions-parameter
  `pRegions` must be a valid pointer to an array of `regionCount` VkDecompressMemoryRegionEXT structures

- VUID-VkDecompressMemoryInfoEXT-regionCount-arraylength
  `regionCount` must be greater than `0`

## See Also

VK_EXT_memory_decompression, VkDecompressMemoryRegionEXT, VkMemoryDecompressionMethodFlagsEXT, VkStructureType, vkCmdDecompressMemoryEXT

## 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