org.lwjgl.vulkan

Class AMDBufferMarker

java.lang.Object

org.lwjgl.vulkan.AMDBufferMarker

public class AMDBufferMarker
extends java.lang.Object

This extension adds a new operation to execute pipelined writes of small marker values into a VkBuffer object.

The primary purpose of these markers is to facilitate the development of debugging tools for tracking which pipelined command contributed to device loss.

Examples

None.

Name String

VK_AMD_buffer_marker

Extension Type

Device extension

Registered Extension Number

180

Revision

1

Extension and Version Dependencies

• Requires Vulkan 1.0

Contact

• Daniel Rakos drakos-amd

Last Modified Date

2018-01-26

IP Status

No known IP claims.

Contributors

• Matthaeus G. Chajdas, AMD
• Jaakko Konttinen, AMD
• Daniel Rakos, AMD

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	VK_AMD_BUFFER_MARKER_EXTENSION_NAME The extension name.
static int	VK_AMD_BUFFER_MARKER_SPEC_VERSION The extension specification version.

Method Summary

Modifier and Type	Method and Description
static void	vkCmdWriteBufferMarkerAMD(org.lwjgl.vulkan.VkCommandBuffer commandBuffer, int pipelineStage, long dstBuffer, long dstOffset, int marker) Execute a pipelined write of a marker value into a buffer.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

VK_AMD_BUFFER_MARKER_SPEC_VERSION

public static final int VK_AMD_BUFFER_MARKER_SPEC_VERSION

The extension specification version.

See Also:

Constant Field Values

VK_AMD_BUFFER_MARKER_EXTENSION_NAME

public static final java.lang.String VK_AMD_BUFFER_MARKER_EXTENSION_NAME

The extension name.

See Also:

Constant Field Values

Method Detail

vkCmdWriteBufferMarkerAMD

public static void vkCmdWriteBufferMarkerAMD(org.lwjgl.vulkan.VkCommandBuffer commandBuffer,
                                             int pipelineStage,
                                             long dstBuffer,
                                             long dstOffset,
                                             int marker)

Execute a pipelined write of a marker value into a buffer.

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);

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 ACCESS_TRANSFER_WRITE_BIT, and the pipeline stages for identifying the synchronization scope must include both pipelineStage and 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 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

Parameters:

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

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

dstBuffer - the buffer where the marker will be written to.

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

marker - the 32-bit value of the marker.