# vkCmdDecompressMemoryIndirectCountNV(3) Manual Page

## Name

vkCmdDecompressMemoryIndirectCountNV - Indirect decompress data between memory regions

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## C Specification

To decompress data between one or more memory regions by specifying decompression parameters indirectly in a buffer, call:

    // Provided by VK_NV_memory_decompression
    void vkCmdDecompressMemoryIndirectCountNV(
        VkCommandBuffer                             commandBuffer,
        VkDeviceAddress                             indirectCommandsAddress,
        VkDeviceAddress                             indirectCommandsCountAddress,
        uint32_t                                    stride);

## Parameters

- `commandBuffer` is the command buffer into which the command will be recorded.

- `indirectCommandsAddress` is the device address containing decompression parameters laid out as an array of VkDecompressMemoryRegionNV structures.

- `indirectCommandsCountAddress` is the device address containing a 32-bit integer value specifying the decompression count.

- `stride` is the byte stride between successive sets of decompression parameters located starting from `indirectCommandsAddress`.

## Description

Each region specified in `indirectCommandsAddress` is decompressed from the source to destination region based on the specified `decompressionMethod`.

Valid Usage

- VUID-vkCmdDecompressMemoryIndirectCountNV-None-07692
  The `memoryDecompression` feature must be enabled

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsAddress-07694
  The VkBuffer that `indirectCommandsAddress` comes from must have been created with the `VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT` usage flag set

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsAddress-07695
  `indirectCommandsAddress` must be a multiple of `4`

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07697
  The VkBuffer that `indirectCommandsCountAddress` comes from must have been created with the `VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT` usage flag set

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07698
  `indirectCommandsCountAddress` must be a multiple of `4`

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07699
  The count stored in `indirectCommandsCountAddress` must be less than or equal to `VkPhysicalDeviceMemoryDecompressionPropertiesEXT`::`maxDecompressionIndirectCount`

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsAddress-11794
  All device addresses between `indirectCommandsAddress` and `indirectCommandsAddress` + (`stride` × (count stored in `indirectCommandsCountAddress`)) - 1 must be in the buffer device address range of the same buffer

- VUID-vkCmdDecompressMemoryIndirectCountNV-stride-11770
  `stride` must be a multiple of `4` and must be greater than or equal to sizeof(VkDecompressMemoryRegionNV)

## See Also

VK_NV_memory_decompression, VkCommandBuffer, VkDeviceAddress

## 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