# VkDrawIndexedIndirectCommand(3) Manual Page

## Name

VkDrawIndexedIndirectCommand - Structure specifying a draw indexed indirect command

## C Specification

The `VkDrawIndexedIndirectCommand` structure is defined as:

    typedef struct VkDrawIndexedIndirectCommand {
        uint32_t    indexCount;
        uint32_t    instanceCount;
        uint32_t    firstIndex;
        int32_t     vertexOffset;
        uint32_t    firstInstance;
    } VkDrawIndexedIndirectCommand;

## Members

- `indexCount` is the number of vertices to draw.

- `instanceCount` is the number of instances to draw.

- `firstIndex` is the base index within the index buffer.

- `vertexOffset` is the value added to the vertex index before indexing into the vertex buffer.

- `firstInstance` is the instance ID of the first instance to draw.

## Description

The members of `VkDrawIndexedIndirectCommand` have the same meaning as the similarly named parameters of vkCmdDrawIndexed.

Valid Usage

- For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#fxvertex-input

- (`indexSize` * (`firstIndex` + `indexCount`) + `offset`) must be less than or equal to the size of the bound index buffer, with `indexSize` being based on the type specified by `indexType`, where the index buffer, `indexType`, and `offset` are specified via `vkCmdBindIndexBuffer`

- If the drawIndirectFirstInstance feature is not enabled, `firstInstance` must be `0`

## See Also

vkCmdDrawIndexedIndirect

## 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.