# vkCmdSetViewportWScalingNV(3) Manual Page

## Name

vkCmdSetViewportWScalingNV - Set the viewport W scaling on a command buffer

## C Specification

If the bound pipeline state object was not created with the `VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV` dynamic state enabled, viewport W scaling parameters are specified using the `pViewportWScalings` member of VkPipelineViewportWScalingStateCreateInfoNV in the pipeline state object. If the pipeline state object was created with the `VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV` dynamic state enabled, the viewport transformation parameters are dynamically set and changed with the command:

    void vkCmdSetViewportWScalingNV(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    firstViewport,
        uint32_t                                    viewportCount,
        const VkViewportWScalingNV*                 pViewportWScalings);

## 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.

- `pViewportWScalings` is a pointer to an array of VkViewportWScalingNV structures specifying viewport parameters.

## Description

The viewport parameters taken from element i of `pViewportWScalings` replace the current state for the viewport index `firstViewport` + i, for i in [0, `viewportCount`).

Valid Usage

- `firstViewport` must be less than VkPhysicalDeviceLimits::`maxViewports`

- The sum of `firstViewport` and `viewportCount` must be between `1` and VkPhysicalDeviceLimits::`maxViewports`, inclusive

Valid Usage (Implicit)

- `commandBuffer` must be a valid VkCommandBuffer handle

- `pViewportWScalings` must be a valid pointer to an array of `viewportCount` VkViewportWScalingNV structures

- `commandBuffer` must be in the recording state

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

- `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 | Supported Queue Types | Pipeline Type
--- | --- | --- | ---
Primary Secondary | Both | Graphics |

## See Also

VkCommandBuffer, VkViewportWScalingNV

## 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.