# vkCmdFillBuffer(3) Manual Page

## Name

vkCmdFillBuffer - Fill a region of a buffer with a fixed value

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## C Specification

To clear buffer data, call:

    // Provided by VK_VERSION_1_0
    void vkCmdFillBuffer(
        VkCommandBuffer                             commandBuffer,
        VkBuffer                                    dstBuffer,
        VkDeviceSize                                dstOffset,
        VkDeviceSize                                size,
        uint32_t                                    data);

## Parameters

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

- `dstBuffer` is the buffer to be filled.

- `dstOffset` is the byte offset into the buffer at which to start filling, and must be a multiple of 4.

- `size` is the number of bytes to fill, and must be either a multiple of 4, or `VK_WHOLE_SIZE` to fill the range from `offset` to the end of the buffer. If `VK_WHOLE_SIZE` is used and the remaining size of the buffer is not a multiple of 4, then the nearest smaller multiple is used.

- `data` is the 4-byte word written repeatedly to the buffer to fill `size` bytes of data. The data word is written to memory according to the host endianness.

## Description

`vkCmdFillBuffer` is treated as a “transfer” operation for the purposes of synchronization barriers. The `VK_BUFFER_USAGE_TRANSFER_DST_BIT` must be specified in `usage` of VkBufferCreateInfo in order for the buffer to be compatible with `vkCmdFillBuffer`.

Valid Usage

- VUID-vkCmdFillBuffer-dstOffset-00024
  `dstOffset` must be less than the size of `dstBuffer`

- VUID-vkCmdFillBuffer-dstOffset-00025
  `dstOffset` must be a multiple of `4`

- VUID-vkCmdFillBuffer-size-00026
  If `size` is not equal to `VK_WHOLE_SIZE`, `size` must be greater than `0`

- VUID-vkCmdFillBuffer-size-00027
  If `size` is not equal to `VK_WHOLE_SIZE`, `size` must be less than or equal to the size of `dstBuffer` minus `dstOffset`

- VUID-vkCmdFillBuffer-size-00028
  If `size` is not equal to `VK_WHOLE_SIZE`, `size` must be a multiple of `4`

- VUID-vkCmdFillBuffer-dstBuffer-00029
  `dstBuffer` must have been created with `VK_BUFFER_USAGE_TRANSFER_DST_BIT` usage flag

- VUID-vkCmdFillBuffer-apiVersion-07894
  If the VK_KHR_maintenance1 extension is not enabled and VkPhysicalDeviceProperties::`apiVersion` is less than Vulkan 1.1, the VkCommandPool that `commandBuffer` was allocated from must support graphics or compute operations

- VUID-vkCmdFillBuffer-dstBuffer-00031
  If `dstBuffer` is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

- VUID-vkCmdFillBuffer-commandBuffer-01811
  If `commandBuffer` is an unprotected command buffer and `protectedNoFault` is not supported, `dstBuffer` must not be a protected buffer

- VUID-vkCmdFillBuffer-commandBuffer-01812
  If `commandBuffer` is a protected command buffer and `protectedNoFault` is not supported, `dstBuffer` must not be an unprotected buffer

Valid Usage (Implicit)

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

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

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

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

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

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

- VUID-vkCmdFillBuffer-commonparent
  Both of `commandBuffer`, and `dstBuffer` 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, VkCommandBuffer, VkDeviceSize

## 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