# vkCmdDecompressMemoryIndirectCountEXT(3) Manual Page

## Name

vkCmdDecompressMemoryIndirectCountEXT - 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_EXT_memory_decompression
    void vkCmdDecompressMemoryIndirectCountEXT(
        VkCommandBuffer                             commandBuffer,
        VkMemoryDecompressionMethodFlagsEXT         decompressionMethod,
        VkDeviceAddress                             indirectCommandsAddress,
        VkDeviceAddress                             indirectCommandsCountAddress,
        uint32_t                                    maxDecompressionCount,
        uint32_t                                    stride);

## Parameters

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

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

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

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

- `maxDecompressionCount` is maximum number of decompressions that will be executed. The actual number of executed decompressions is the minimum of the count specified in `indirectCommandsCountAddress` and `maxDecompressionCount`.

- `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-vkCmdDecompressMemoryIndirectCountEXT-None-07692
  The `memoryDecompression` feature must be enabled

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

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

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

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

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

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

- VUID-vkCmdDecompressMemoryIndirectCountEXT-stride-11767
  `stride` must be a multiple of `4` and must be greater than or equal to sizeof(VkDecompressMemoryRegionEXT)

- VUID-vkCmdDecompressMemoryIndirectCountEXT-maxDecompressionCount-11768
  `maxDecompressionCount` must be less than or equal to `VkPhysicalDeviceMemoryDecompressionPropertiesEXT`::`maxDecompressionIndirectCount`

- VUID-vkCmdDecompressMemoryIndirectCountEXT-decompressionMethod-11769
  If `decompressionMethod` is `VK_MEMORY_DECOMPRESSION_METHOD_GDEFLATE_1_0_BIT_EXT`, then all values in VkDecompressMemoryRegionEXT::`decompressedSize` must be less than or equal to 65536 bytes

- VUID-vkCmdDecompressMemoryIndirectCountEXT-decompressionMethod-11810
  `decompressionMethod` must be a valid bit specified in `VkPhysicalDeviceMemoryDecompressionPropertiesEXT`::`decompressionMethods`

Valid Usage (Implicit)

- VUID-vkCmdDecompressMemoryIndirectCountEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

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

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

- VUID-vkCmdDecompressMemoryIndirectCountEXT-indirectCommandsAddress-parameter
  `indirectCommandsAddress` must be a valid VkDeviceAddress value

- VUID-vkCmdDecompressMemoryIndirectCountEXT-indirectCommandsCountAddress-parameter
  `indirectCommandsCountAddress` must be a valid VkDeviceAddress value

- VUID-vkCmdDecompressMemoryIndirectCountEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdDecompressMemoryIndirectCountEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support `VK_QUEUE_COMPUTE_BIT`, or `VK_QUEUE_GRAPHICS_BIT` operations

- VUID-vkCmdDecompressMemoryIndirectCountEXT-renderpass
  This command must only be called outside of a render pass instance

- VUID-vkCmdDecompressMemoryIndirectCountEXT-suspended
  This command must not be called between suspended render pass instances

- VUID-vkCmdDecompressMemoryIndirectCountEXT-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Outside | Outside | VK_QUEUE_COMPUTE_BIT VK_QUEUE_GRAPHICS_BIT | Action

Conditional Rendering

vkCmdDecompressMemoryIndirectCountEXT is not affected by conditional rendering

## See Also

VK_EXT_memory_decompression, VkCommandBuffer, VkDeviceAddress, VkMemoryDecompressionMethodFlagsEXT

## 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