vkCmdEndTransformFeedbackEXT(3)

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