## C Specification

To write a 32-bit marker value into a buffer as a pipelined operation, call:

void vkCmdWriteBufferMarkerAMD(
VkCommandBuffer                             commandBuffer,
VkPipelineStageFlagBits                     pipelineStage,
VkBuffer                                    dstBuffer,
VkDeviceSize                                dstOffset,
uint32_t                                    marker);

## Parameters

• commandBuffer is the command buffer into which the command will be recorded.

• pipelineStage is one of the VkPipelineStageFlagBits values, specifying the pipeline stage whose completion triggers the marker write.

• dstBuffer is the buffer where the marker will be written to.

• dstOffset is the byte offset into the buffer where the marker will be written to.

• marker is the 32-bit value of the marker.

## Description

The command will write the 32-bit marker value into the buffer only after all preceding commands have finished executing up to at least the specified pipeline stage. This includes the completion of other preceding vkCmdWriteBufferMarkerAMD commands so long as their specified pipeline stages occur either at the same time or earlier than this command’s specified pipelineStage.

While consecutive buffer marker writes with the same pipelineStage parameter are implicitly complete in submission order, memory and execution dependencies between buffer marker writes and other operations must still be explicitly ordered using synchronization commands. The access scope for buffer marker writes falls under the VK_ACCESS_TRANSFER_WRITE_BIT, and the pipeline stages for identifying the synchronization scope must include both pipelineStage and VK_PIPELINE_STAGE_TRANSFER_BIT.

 Note Similar to vkCmdWriteTimestamp, if an implementation is unable to write a marker at any specific pipeline stage, it may instead do so at any logically later stage.
 Note Implementations may only support a limited number of pipelined marker write operations in flight at a given time, thus excessive number of marker write operations may degrade command execution performance.
Valid Usage
• dstOffset must be less than or equal to the size of dstBuffer minus 4

• dstBuffer must have been created with VK_BUFFER_USAGE_TRANSFER_DST_BIT usage flag

• If dstBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• dstOffset must be a multiple of 4

Valid Usage (Implicit)
• commandBuffer must be a valid VkCommandBuffer handle

• pipelineStage must be a valid VkPipelineStageFlagBits value

• dstBuffer must be a valid VkBuffer handle

• commandBuffer must be in the recording state

• The VkCommandPool that commandBuffer was allocated from must support transfer, graphics, or compute operations

• 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 Supported Queue Types Pipeline Type

Primary
Secondary

Both

Transfer
Graphics
Compute

Transfer

VkBuffer, VkCommandBuffer, VkDeviceSize, VkPipelineStageFlagBits