vkCmdInitializeGraphScratchMemoryAMDX(3)

C Specification

To initialize scratch memory for a particular execution graph, call:

// Provided by VK_AMDX_shader_enqueue
void vkCmdInitializeGraphScratchMemoryAMDX(
    VkCommandBuffer                             commandBuffer,
    VkDeviceAddress                             scratch);

Parameters

commandBuffer is the command buffer into which the command will be recorded.
scratch is a pointer to the scratch memory to be initialized.

Description

This command must be called before using scratch to dispatch the currently bound execution graph pipeline.

Execution of this command may modify any memory locations in the range [scratch,scratch + size), where size is the value returned in VkExecutionGraphPipelineScratchSizeAMDX::size by VkExecutionGraphPipelineScratchSizeAMDX for the currently bound execution graph pipeline. Accesses to this memory range are performed in the VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT pipeline stage with the VK_ACCESS_2_SHADER_STORAGE_READ_BIT and VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT access flags.

If any portion of scratch is modified by any command other than vkCmdDispatchGraphAMDX, vkCmdDispatchGraphIndirectAMDX, vkCmdDispatchGraphIndirectCountAMDX, or vkCmdInitializeGraphScratchMemoryAMDX with the same execution graph, it must be reinitialized for the execution graph again before dispatching against it.

Valid Usage

VUID-vkCmdInitializeGraphScratchMemoryAMDX-scratch-09143
scratch must be the device address of an allocated memory range at least as large as the value of VkExecutionGraphPipelineScratchSizeAMDX::size returned by VkExecutionGraphPipelineScratchSizeAMDX for the currently bound execution graph pipeline.
VUID-vkCmdInitializeGraphScratchMemoryAMDX-scratch-09144
scratch must be a multiple of 64

Valid Usage (Implicit)

VUID-vkCmdInitializeGraphScratchMemoryAMDX-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle
VUID-vkCmdInitializeGraphScratchMemoryAMDX-commandBuffer-recording
commandBuffer must be in the recording state
VUID-vkCmdInitializeGraphScratchMemoryAMDX-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics, or compute operations
VUID-vkCmdInitializeGraphScratchMemoryAMDX-renderpass
This command must only be called outside of a render pass instance
VUID-vkCmdInitializeGraphScratchMemoryAMDX-videocoding
This command must only be called outside of a video coding scope
VUID-vkCmdInitializeGraphScratchMemoryAMDX-bufferlevel
commandBuffer must be a primary VkCommandBuffer