# vkCmdEndTransformFeedbackEXT(3) Manual Page

## Name

vkCmdEndTransformFeedbackEXT - Make transform feedback inactive in the command buffer

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## C Specification

Transform feedback for specific transform feedback buffers is made inactive by calling:

    // Provided by VK_EXT_transform_feedback
    void vkCmdEndTransformFeedbackEXT(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    firstCounterBuffer,
        uint32_t                                    counterBufferCount,
        const VkBuffer*                             pCounterBuffers,
        const VkDeviceSize*                         pCounterBufferOffsets);

## Parameters

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

- `firstCounterBuffer` is the index of the first transform feedback buffer corresponding to `pCounterBuffers`[0] and `pCounterBufferOffsets`[0].

- `counterBufferCount` is the size of the `pCounterBuffers` and `pCounterBufferOffsets` arrays.

- `pCounterBuffers` is `NULL` or a pointer to an array of VkBuffer handles to counter buffers. The counter buffers are used to record the current byte positions of each transform feedback buffer where the next vertex output data would be captured. This can be used by a subsequent vkCmdBeginTransformFeedbackEXT call to resume transform feedback capture from this position. It can also be used by vkCmdDrawIndirectByteCountEXT to determine the vertex count of the draw call.

- `pCounterBufferOffsets` is `NULL` or a pointer to an array of VkDeviceSize values specifying offsets within each of the `pCounterBuffers` where the counter values can be written. The location in each counter buffer at these offsets must be large enough to contain 4 bytes of data. The data stored at this location is the byte offset from the start of the transform feedback buffer binding where the next vertex data would be written. If `pCounterBufferOffsets` is `NULL`, then it is assumed the offsets are zero.

## Description

Valid Usage

- VUID-vkCmdEndTransformFeedbackEXT-transformFeedback-02374
  `VkPhysicalDeviceTransformFeedbackFeaturesEXT`::`transformFeedback` must be enabled

- VUID-vkCmdEndTransformFeedbackEXT-None-02375
  Transform feedback must be active

- VUID-vkCmdEndTransformFeedbackEXT-firstCounterBuffer-02376
  `firstCounterBuffer` must be less than `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackBuffers`

- VUID-vkCmdEndTransformFeedbackEXT-firstCounterBuffer-02377
  The sum of `firstCounterBuffer` and `counterBufferCount` must be less than or equal to `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackBuffers`

- VUID-vkCmdEndTransformFeedbackEXT-counterBufferCount-02608
  If `counterBufferCount` is not `0`, and `pCounterBuffers` is not `NULL`, `pCounterBuffers` must be a valid pointer to an array of `counterBufferCount` `VkBuffer` handles that are either valid or VK_NULL_HANDLE

- VUID-vkCmdEndTransformFeedbackEXT-pCounterBufferOffsets-02378
  For each buffer handle in the array, if it is not VK_NULL_HANDLE it must reference a buffer large enough to hold 4 bytes at the corresponding offset from the `pCounterBufferOffsets` array

- VUID-vkCmdEndTransformFeedbackEXT-pCounterBuffer-02379
  If `pCounterBuffer` is `NULL`, then `pCounterBufferOffsets` must also be `NULL`

- VUID-vkCmdEndTransformFeedbackEXT-pCounterBuffers-02380
  For each buffer handle in the `pCounterBuffers` array that is not VK_NULL_HANDLE it must have been created with a `usage` value containing `VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_COUNTER_BUFFER_BIT_EXT`

Valid Usage (Implicit)

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

- VUID-vkCmdEndTransformFeedbackEXT-pCounterBufferOffsets-parameter
  If `counterBufferCount` is not `0`, and `pCounterBufferOffsets` is not `NULL`, `pCounterBufferOffsets` must be a valid pointer to an array of `counterBufferCount` VkDeviceSize values

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

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

- VUID-vkCmdEndTransformFeedbackEXT-renderpass
  This command must only be called inside of a render pass instance

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

- VUID-vkCmdEndTransformFeedbackEXT-commonparent
  Both of `commandBuffer`, and the elements of `pCounterBuffers` that are valid handles of non-ignored parameters 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 | Inside | 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0