# VkDecompressMemoryRegionNV(3) Manual Page

## Name

VkDecompressMemoryRegionNV - Structure specifying decompression region parameters

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## C Specification

The `VkDecompressMemoryRegionNV` structure is defined as:

    // Provided by VK_NV_memory_decompression
    typedef struct VkDecompressMemoryRegionNV {
        VkDeviceAddress                       srcAddress;
        VkDeviceAddress                       dstAddress;
        VkDeviceSize                          compressedSize;
        VkDeviceSize                          decompressedSize;
        VkMemoryDecompressionMethodFlagsNV    decompressionMethod;
    } VkDecompressMemoryRegionNV;

## Members

- `srcAddress` is the address where compressed data is stored.

- `dstAddress` is the destination address where decompressed data will be written.

- `compressedSize` is the size of compressed data in bytes.

- `decompressedSize` is the size of decompressed data in bytes.

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

## Description

Valid Usage

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

- VUID-VkDecompressMemoryRegionNV-srcAddress-07685
  `srcAddress` must be 4 byte aligned

- VUID-VkDecompressMemoryRegionNV-srcAddress-07686
  The memory range defined by `srcAddress` and `compressedSize` must be contained within the size of the buffer bound to `srcAddress`, minus the offset of `srcAddress` from the base address of that buffer

- VUID-VkDecompressMemoryRegionNV-dstAddress-07687
  `dstAddress` must be 4 byte aligned

- VUID-VkDecompressMemoryRegionNV-dstAddress-07688
  The memory range defined by `dstAddress` and `decompressedSize` must be contained within the size of the buffer bound to `dstAddress`, minus the offset of `dstAddress` from the base address of that buffer

- VUID-VkDecompressMemoryRegionNV-decompressedSize-07689
  `decompressedSize` must be large enough to hold the decompressed data based on the `decompressionMethod`

- VUID-VkDecompressMemoryRegionNV-compressedSize-11795
  `compressedSize` must not be zero

- VUID-VkDecompressMemoryRegionNV-decompressedSize-11796
  `decompressedSize` must not be zero

- VUID-VkDecompressMemoryRegionNV-srcAddress-07691
  The memory range defined by `srcAddress` and `compressedSize` must not overlap the memory range defined by `dstAddress` and `decompressedSize`

- VUID-VkDecompressMemoryRegionNV-decompressionMethod-09395
  If `decompressionMethod` is `VK_MEMORY_DECOMPRESSION_METHOD_GDEFLATE_1_0_BIT_EXT`, then `decompressedSize` must be less than or equal to 65536 bytes

- VUID-vkCmdDecompressMemoryNV-memoryDecompression-11766
  The `memoryDecompression` feature must be enabled

## See Also

VK_NV_memory_decompression, VkDeviceAddress, VkDeviceSize, VkMemoryDecompressionMethodFlagsEXT, vkCmdDecompressMemoryNV

## 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