# vkGetRayTracingCaptureReplayShaderGroupHandlesKHR(3) Manual Page

## Name

vkGetRayTracingCaptureReplayShaderGroupHandlesKHR - Query ray tracing capture replay pipeline shader group handles

## C Specification

To query the optional capture handle information of shaders in the ray tracing pipeline, call:

    VkResult vkGetRayTracingCaptureReplayShaderGroupHandlesKHR(
        VkDevice                                    device,
        VkPipeline                                  pipeline,
        uint32_t                                    firstGroup,
        uint32_t                                    groupCount,
        size_t                                      dataSize,
        void*                                       pData);

## Parameters

- `device` is the logical device containing the ray tracing pipeline.

- `pipeline` is the ray tracing pipeline object containing the shaders.

- `firstGroup` is the index of the first group to retrieve a handle for from the VkRayTracingPipelineCreateInfoKHR::`pGroups` array.

- `groupCount` is the number of shader handles to retrieve.

- `dataSize` is the size in bytes of the buffer pointed to by `pData`.

- `pData` is a pointer to a user-allocated buffer where the results will be written.

## Description

Valid Usage

- The sum of `firstGroup` and `groupCount` must be less than the number of shader groups in `pipeline`.

- `dataSize` must be at least VkPhysicalDeviceRayTracingPropertiesKHR::`shaderGroupHandleCaptureReplaySize` × `groupCount`

- `VkPhysicalDeviceRayTracingFeaturesKHR`::`rayTracingShaderGroupHandleCaptureReplay` must be enabled to call this function.

Valid Usage (Implicit)

- `device` must be a valid VkDevice handle

- `pipeline` must be a valid VkPipeline handle

- `pData` must be a valid pointer to an array of `dataSize` bytes

- `dataSize` must be greater than `0`

- `pipeline` must have been created, allocated, or retrieved from `device`

Return Codes

On success, this command returns

  - `VK_SUCCESS`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

## See Also

VkDevice, VkPipeline

## 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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.