# vkCmdCopyBuffer(3) Manual Page

## Name

vkCmdCopyBuffer - Copy data between buffer regions

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## C Specification

To copy data between buffer objects, call:

    // Provided by VK_VERSION_1_0
    void vkCmdCopyBuffer(
        VkCommandBuffer                             commandBuffer,
        VkBuffer                                    srcBuffer,
        VkBuffer                                    dstBuffer,
        uint32_t                                    regionCount,
        const VkBufferCopy*                         pRegions);

## Parameters

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

- `srcBuffer` is the source buffer.

- `dstBuffer` is the destination buffer.

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

- `pRegions` is a pointer to an array of VkBufferCopy structures specifying the regions to copy.

## Description

Each source region specified by `pRegions` is copied from the source buffer to the destination region of the destination buffer. If any of the specified regions in `srcBuffer` overlaps in memory with any of the specified regions in `dstBuffer`, values read from those overlapping regions are undefined.

Valid Usage

- VUID-vkCmdCopyBuffer-commandBuffer-01822
  If `commandBuffer` is an unprotected command buffer and `protectedNoFault` is not supported, `srcBuffer` must not be a protected buffer

- VUID-vkCmdCopyBuffer-commandBuffer-01823
  If `commandBuffer` is an unprotected command buffer and `protectedNoFault` is not supported, `dstBuffer` must not be a protected buffer

- VUID-vkCmdCopyBuffer-commandBuffer-01824
  If `commandBuffer` is a protected command buffer and `protectedNoFault` is not supported, `dstBuffer` must not be an unprotected buffer

- VUID-vkCmdCopyBuffer-srcOffset-00113
  The `srcOffset` member of each element of `pRegions` must be less than the size of `srcBuffer`

- VUID-vkCmdCopyBuffer-dstOffset-00114
  The `dstOffset` member of each element of `pRegions` must be less than the size of `dstBuffer`

- VUID-vkCmdCopyBuffer-size-00115
  The `size` member of each element of `pRegions` must be less than or equal to the size of `srcBuffer` minus `srcOffset`

- VUID-vkCmdCopyBuffer-size-00116
  The `size` member of each element of `pRegions` must be less than or equal to the size of `dstBuffer` minus `dstOffset`

- VUID-vkCmdCopyBuffer-pRegions-00117
  The union of the source regions, and the union of the destination regions, specified by the elements of `pRegions`, must not overlap in memory

- VUID-vkCmdCopyBuffer-srcBuffer-00118
  `srcBuffer` must have been created with `VK_BUFFER_USAGE_TRANSFER_SRC_BIT` usage flag

- VUID-vkCmdCopyBuffer-srcBuffer-00119
  If `srcBuffer` is non-sparse then it must be bound completely and contiguously to a single `VkDeviceMemory` object

- VUID-vkCmdCopyBuffer-dstBuffer-00120
  `dstBuffer` must have been created with `VK_BUFFER_USAGE_TRANSFER_DST_BIT` usage flag

- VUID-vkCmdCopyBuffer-dstBuffer-00121
  If `dstBuffer` is non-sparse then it must be bound completely and contiguously to a single `VkDeviceMemory` object

Valid Usage (Implicit)

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

- VUID-vkCmdCopyBuffer-srcBuffer-parameter
  `srcBuffer` must be a valid VkBuffer handle

- VUID-vkCmdCopyBuffer-dstBuffer-parameter
  `dstBuffer` must be a valid VkBuffer handle

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

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

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

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

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

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

- VUID-vkCmdCopyBuffer-commonparent
  Each of `commandBuffer`, `dstBuffer`, and `srcBuffer` must have been created, allocated, or retrieved from the same VkDevice

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 | Transfer Graphics Compute | Action

## See Also

VK_VERSION_1_0, VkBuffer, VkBufferCopy, VkCommandBuffer

## 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