# vkCmdSetViewportSwizzleNV(3) Manual Page

## Name

vkCmdSetViewportSwizzleNV - Specify the viewport swizzle state dynamically for a command buffer

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## C Specification

To dynamically set the viewport swizzle state, call:

    // Provided by VK_EXT_extended_dynamic_state3 with VK_NV_viewport_swizzle, VK_EXT_shader_object with VK_NV_viewport_swizzle
    void vkCmdSetViewportSwizzleNV(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    firstViewport,
        uint32_t                                    viewportCount,
        const VkViewportSwizzleNV*                  pViewportSwizzles);

## Parameters

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

- `firstViewport` is the index of the first viewport whose parameters are updated by the command.

- `viewportCount` is the number of viewports whose parameters are updated by the command.

- `pViewportSwizzles` is a pointer to an array of VkViewportSwizzleNV structures specifying viewport swizzles.

## Description

This command sets the viewport swizzle state for subsequent drawing commands when drawing using shader objects, or when the graphics pipeline is created with `VK_DYNAMIC_STATE_VIEWPORT_SWIZZLE_NV` set in VkPipelineDynamicStateCreateInfo::`pDynamicStates`. Otherwise, this state is specified by the VkPipelineViewportSwizzleStateCreateInfoNV::`viewportCount`, and VkPipelineViewportSwizzleStateCreateInfoNV::`pViewportSwizzles` values used to create the currently active pipeline.

Valid Usage

- VUID-vkCmdSetViewportSwizzleNV-None-09423
  At least one of the following must be true:

  - The `extendedDynamicState3ViewportSwizzle` feature is enabled

  - The `shaderObject` feature is enabled

Valid Usage (Implicit)

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

- VUID-vkCmdSetViewportSwizzleNV-pViewportSwizzles-parameter
  `pViewportSwizzles` must be a valid pointer to an array of `viewportCount` valid VkViewportSwizzleNV structures

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

- VUID-vkCmdSetViewportSwizzleNV-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

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

- VUID-vkCmdSetViewportSwizzleNV-viewportCount-arraylength
  `viewportCount` must be greater than `0`

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 | Graphics | State

## See Also

VK_EXT_extended_dynamic_state3, VK_EXT_shader_object, VK_NV_viewport_swizzle, VkCommandBuffer, VkViewportSwizzleNV

## 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