# vkCmdSetRayTracingPipelineStackSizeKHR(3) Manual Page

## Name

vkCmdSetRayTracingPipelineStackSizeKHR - Set the stack size dynamically for a ray tracing pipeline

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## C Specification

To dynamically set the stack size for a ray tracing pipeline, call:

    // Provided by VK_KHR_ray_tracing_pipeline
    void vkCmdSetRayTracingPipelineStackSizeKHR(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    pipelineStackSize);

## Parameters

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

- `pipelineStackSize` is the stack size to use for subsequent ray tracing trace commands.

## Description

This command sets the stack size for subsequent ray tracing commands when the ray tracing pipeline is created with `VK_DYNAMIC_STATE_RAY_TRACING_PIPELINE_STACK_SIZE_KHR` set in VkPipelineDynamicStateCreateInfo::`pDynamicStates`. Otherwise, the stack size is computed as described in Ray Tracing Pipeline Stack.

Valid Usage

- VUID-vkCmdSetRayTracingPipelineStackSizeKHR-pipelineStackSize-03610
  `pipelineStackSize` must be large enough for any dynamic execution through the shaders in the ray tracing pipeline used by a subsequent trace call

Valid Usage (Implicit)

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

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

- VUID-vkCmdSetRayTracingPipelineStackSizeKHR-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support compute operations

- VUID-vkCmdSetRayTracingPipelineStackSizeKHR-renderpass
  This command must only be called outside of a render pass instance

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

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 | Outside | Outside | Compute | State

## See Also

VK_KHR_ray_tracing_pipeline, VkCommandBuffer

## 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