# vkCmdSetPrimitiveRestartIndexEXT(3) Manual Page

## Name

vkCmdSetPrimitiveRestartIndexEXT - Set primitive assembly restart index dynamically for a command buffer

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## C Specification

To dynamically control which special vertex index value is treated as restarting the assembly of primitives, call:

    // Provided by VK_EXT_primitive_restart_index
    void vkCmdSetPrimitiveRestartIndexEXT(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    primitiveRestartIndex);

## Parameters

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

- `primitiveRestartIndex` controls which special vertex index value is treated as restarting the assembly of primitives. This overrides the default values specified in VkPipelineInputAssemblyStateCreateInfo::`primitiveRestartEnable`.

## Description

This command sets a custom primitive restart index for subsequent drawing commands. Binding an index buffer invalidates the custom index value.

Valid Usage

- VUID-vkCmdSetPrimitiveRestartIndexEXT-primitiveRestartIndex-12395
  The `primitiveRestartIndex` feature must be enabled

Valid Usage (Implicit)

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

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

- VUID-vkCmdSetPrimitiveRestartIndexEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support VK_QUEUE_GRAPHICS_BIT operations

- VUID-vkCmdSetPrimitiveRestartIndexEXT-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 | Both | Outside | VK_QUEUE_GRAPHICS_BIT | State

Conditional Rendering

vkCmdSetPrimitiveRestartIndexEXT is not affected by conditional rendering

## See Also

VK_EXT_primitive_restart_index, 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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0