# vkCmdBindTransformFeedbackBuffersEXT(3) Manual Page

## Name

vkCmdBindTransformFeedbackBuffersEXT - Bind transform feedback buffers to a command buffer

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## C Specification

To bind transform feedback buffers to a command buffer for use in subsequent drawing commands, call:

    // Provided by VK_EXT_transform_feedback
    void vkCmdBindTransformFeedbackBuffersEXT(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    firstBinding,
        uint32_t                                    bindingCount,
        const VkBuffer*                             pBuffers,
        const VkDeviceSize*                         pOffsets,
        const VkDeviceSize*                         pSizes);

## Parameters

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

- `firstBinding` is the index of the first transform feedback binding whose state is updated by the command.

- `bindingCount` is the number of transform feedback bindings whose state is updated by the command.

- `pBuffers` is a pointer to an array of buffer handles.

- `pOffsets` is a pointer to an array of buffer offsets.

- `pSizes` is `NULL` or a pointer to an array of VkDeviceSize buffer sizes, specifying the maximum number of bytes to capture to the corresponding transform feedback buffer. If `pSizes` is `NULL`, or the value of the `pSizes` array element is `VK_WHOLE_SIZE`, then the maximum number of bytes captured will be the size of the corresponding buffer minus the buffer offset.

## Description

The values taken from elements i of `pBuffers`, `pOffsets` and `pSizes` replace the current state for the transform feedback binding `firstBinding` + i, for i in [0, `bindingCount`). The transform feedback binding is updated to start at the offset indicated by `pOffsets`[i] from the start of the buffer `pBuffers`[i].

Valid Usage

- VUID-vkCmdBindTransformFeedbackBuffersEXT-transformFeedback-02355
  `VkPhysicalDeviceTransformFeedbackFeaturesEXT`::`transformFeedback` must be enabled

- VUID-vkCmdBindTransformFeedbackBuffersEXT-firstBinding-02356
  `firstBinding` must be less than `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackBuffers`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-firstBinding-02357
  The sum of `firstBinding` and `bindingCount` must be less than or equal to `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackBuffers`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pOffsets-02358
  All elements of `pOffsets` must be less than the size of the corresponding element in `pBuffers`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pOffsets-02359
  All elements of `pOffsets` must be a multiple of 4

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pBuffers-02360
  All elements of `pBuffers` must have been created with the `VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_BUFFER_BIT_EXT` flag

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pSize-02361
  If the optional `pSize` array is specified, each element of `pSizes` must either be `VK_WHOLE_SIZE`, or be less than or equal to `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackBufferSize`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pSizes-02362
  All elements of `pSizes` must be either `VK_WHOLE_SIZE`, or less than or equal to the size of the corresponding buffer in `pBuffers`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pOffsets-02363
  All elements of `pOffsets` plus `pSizes`, where the `pSizes`, element is not `VK_WHOLE_SIZE`, must be less than or equal to the size of the corresponding buffer in `pBuffers`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pBuffers-02364
  Each element of `pBuffers` that is non-sparse must be bound completely and contiguously to a single `VkDeviceMemory` object

- VUID-vkCmdBindTransformFeedbackBuffersEXT-None-02365
  Transform feedback must not be active when the `vkCmdBindTransformFeedbackBuffersEXT` command is recorded

Valid Usage (Implicit)

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

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pBuffers-parameter
  `pBuffers` must be a valid pointer to an array of `bindingCount` valid VkBuffer handles

- VUID-vkCmdBindTransformFeedbackBuffersEXT-pOffsets-parameter
  `pOffsets` must be a valid pointer to an array of `bindingCount` VkDeviceSize values

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

- VUID-vkCmdBindTransformFeedbackBuffersEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

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

- VUID-vkCmdBindTransformFeedbackBuffersEXT-bindingCount-arraylength
  `bindingCount` must be greater than `0`

- VUID-vkCmdBindTransformFeedbackBuffersEXT-commonparent
  Both of `commandBuffer`, and the elements of `pBuffers` 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 | Both | Outside | Graphics | State

## See Also

VK_EXT_transform_feedback, 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