# vkCmdSetDiscardRectangleEXT(3) Manual Page

## Name

vkCmdSetDiscardRectangleEXT - Set discard rectangles dynamically for a command buffer

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## C Specification

To dynamically set the discard rectangles, call:

    // Provided by VK_EXT_discard_rectangles
    void vkCmdSetDiscardRectangleEXT(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    firstDiscardRectangle,
        uint32_t                                    discardRectangleCount,
        const VkRect2D*                             pDiscardRectangles);

## Parameters

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

- `firstDiscardRectangle` is the index of the first discard rectangle whose state is updated by the command.

- `discardRectangleCount` is the number of discard rectangles whose state are updated by the command.

- `pDiscardRectangles` is a pointer to an array of VkRect2D structures specifying discard rectangles.

## Description

The discard rectangle taken from element i of `pDiscardRectangles` replace the current state for the discard rectangle at index `firstDiscardRectangle` + i, for i in [0, `discardRectangleCount`).

This command sets the discard rectangles for subsequent drawing commands when drawing using shader objects, or when the graphics pipeline is created with `VK_DYNAMIC_STATE_DISCARD_RECTANGLE_EXT` set in VkPipelineDynamicStateCreateInfo::`pDynamicStates`. Otherwise, this state is specified by the VkPipelineDiscardRectangleStateCreateInfoEXT::`pDiscardRectangles` values used to create the currently active pipeline.

Valid Usage

- VUID-vkCmdSetDiscardRectangleEXT-firstDiscardRectangle-00585
  The sum of `firstDiscardRectangle` and `discardRectangleCount` must be less than or equal to VkPhysicalDeviceDiscardRectanglePropertiesEXT::`maxDiscardRectangles`

- VUID-vkCmdSetDiscardRectangleEXT-x-00587
  The `x` and `y` member of `offset` in each VkRect2D element of `pDiscardRectangles` must be greater than or equal to `0`

- VUID-vkCmdSetDiscardRectangleEXT-offset-00588
  Evaluation of (`offset.x` + `extent.width`) in each VkRect2D element of `pDiscardRectangles` must not cause a signed integer addition overflow

- VUID-vkCmdSetDiscardRectangleEXT-offset-00589
  Evaluation of (`offset.y` + `extent.height`) in each VkRect2D element of `pDiscardRectangles` must not cause a signed integer addition overflow

- VUID-vkCmdSetDiscardRectangleEXT-viewportScissor2D-04788
  If this command is recorded in a secondary command buffer with VkCommandBufferInheritanceViewportScissorInfoNV::`viewportScissor2D` enabled, then this function must not be called

Valid Usage (Implicit)

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

- VUID-vkCmdSetDiscardRectangleEXT-pDiscardRectangles-parameter
  `pDiscardRectangles` must be a valid pointer to an array of `discardRectangleCount` VkRect2D structures

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

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

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

- VUID-vkCmdSetDiscardRectangleEXT-discardRectangleCount-arraylength
  `discardRectangleCount` 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_discard_rectangles, VkCommandBuffer, VkRect2D

## 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