C Specification

To dynamically set the viewport W scaling parameters, call:

// Provided by VK_NV_clip_space_w_scaling
void vkCmdSetViewportWScalingNV(
    VkCommandBuffer                             commandBuffer,
    uint32_t                                    firstViewport,
    uint32_t                                    viewportCount,
    const VkViewportWScalingNV*                 pViewportWScalings);


  • 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.


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

This command sets the viewport W scaling for subsequent drawing commands when drawing using shader objects, or when the graphics pipeline is created with VK_DYNAMIC_STATE_VIEWPORT_W_SCALING_NV set in VkPipelineDynamicStateCreateInfo::pDynamicStates. Otherwise, this state is specified by the VkPipelineViewportWScalingStateCreateInfoNV::pViewportWScalings values used to create the currently active pipeline.

Valid Usage
  • VUID-vkCmdSetViewportWScalingNV-firstViewport-01324
    The sum of firstViewport and viewportCount must be between 1 and VkPhysicalDeviceLimits::maxViewports, inclusive

Valid Usage (Implicit)
  • VUID-vkCmdSetViewportWScalingNV-commandBuffer-parameter
    commandBuffer must be a valid VkCommandBuffer handle

  • VUID-vkCmdSetViewportWScalingNV-pViewportWScalings-parameter
    pViewportWScalings must be a valid pointer to an array of viewportCount VkViewportWScalingNV structures

  • VUID-vkCmdSetViewportWScalingNV-commandBuffer-recording
    commandBuffer must be in the recording state

  • VUID-vkCmdSetViewportWScalingNV-commandBuffer-cmdpool
    The VkCommandPool that commandBuffer was allocated from must support graphics operations

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

  • VUID-vkCmdSetViewportWScalingNV-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






See Also

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 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0