# 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 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 decompression method.

Valid Usage

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

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsAddress-07693
  If `indirectCommandsAddress` comes from a non-sparse buffer then it must be bound completely and contiguously to a single `VkDeviceMemory` object

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

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

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07696
  If `indirectCommandsCountAddress` comes from a non-sparse buffer then it must be bound completely and contiguously to a single `VkDeviceMemory` object

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07697
  The VkBuffer that `indirectCommandsCountAddress` comes from must have been created with the `VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT` bit 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 `VkPhysicalDeviceMemoryDecompressionPropertiesNV`::`maxDecompressionIndirectCount`

- VUID-vkCmdDecompressMemoryIndirectCountNV-stride-07700
  `stride` must be a multiple of `4` and must be greater than or equal to sizeof(`VkDecompressMemoryRegionNV`)

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07701
  If the count stored in `indirectCommandsCountAddress` is equal to `1`, (`offset` + sizeof(`VkDecompressMemoryRegionNV`)) must be less than or equal to the size of the VkBuffer that `indirectCommandsAddress` comes from

- VUID-vkCmdDecompressMemoryIndirectCountNV-indirectCommandsCountAddress-07702
  If the count stored in `indirectCommandsCountAddress` is greater than `1`, `indirectCommandsAddress` + sizeof(`VkDecompressMemoryRegionNV`) + (`stride` × (count stored in `countBuffer` - 1)) must be less than or equal to the last valid address in the VkBuffer that `indirectCommandsAddress` was created from

Valid Usage (Implicit)

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

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

- VUID-vkCmdDecompressMemoryIndirectCountNV-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, or compute operations

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

- VUID-vkCmdDecompressMemoryIndirectCountNV-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 | Graphics Compute | Action

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0