Registered Extension Number

191

Revision

3

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2
or
Vulkan Version 1.1

Deprecation State

Contact

Other Extension Metadata

Last Modified Date

2018-08-03

IP Status

No known IP claims.

Contributors

  • Vikram Kushwaha, NVIDIA

  • Faith Ekstrand, Intel

Description

This extension allows instance-rate vertex attributes to be repeated for certain number of instances instead of advancing for every instance when instanced rendering is enabled.

New Structures

New Enum Constants

Issues

1) What is the effect of a non-zero value for firstInstance?

RESOLVED: The Vulkan API should follow the OpenGL convention and offset attribute fetching by firstInstance while computing vertex attribute offsets.

2) Should zero be an allowed divisor?

RESOLVED: Yes. A zero divisor means the vertex attribute is repeated for all instances.

Examples

To create a vertex binding such that the first binding uses instanced rendering and the same attribute is used for every 4 draw instances, an application could use the following set of structures:

    const VkVertexInputBindingDivisorDescriptionEXT divisorDesc =
    {
        .binding = 0,
        .divisor = 4
    };

    const VkPipelineVertexInputDivisorStateCreateInfoEXT divisorInfo =
    {
        .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_DIVISOR_STATE_CREATE_INFO_EXT,
        .pNext = NULL,
        .vertexBindingDivisorCount = 1,
        .pVertexBindingDivisors = &divisorDesc
    }

    const VkVertexInputBindingDescription binding =
    {
        .binding = 0,
        .stride = sizeof(Vertex),
        .inputRate = VK_VERTEX_INPUT_RATE_INSTANCE
    };

    const VkPipelineVertexInputStateCreateInfo viInfo =
    {
        .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_CREATE_INFO,
        .pNext = &divisorInfo,
        ...
    };
    //...

Version History

  • Revision 1, 2017-12-04 (Vikram Kushwaha)

    • First Version

  • Revision 2, 2018-07-16 (Faith Ekstrand)

    • Adjust the interaction between divisor and firstInstance to match the OpenGL convention.

    • Disallow divisors of zero.

  • Revision 3, 2018-08-03 (Vikram Kushwaha)

    • Allow a zero divisor.

    • Add a physical device features structure to query/enable this feature.

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification.

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

Copyright

Copyright 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0