# vkCmdBeginCustomResolveEXT(3) Manual Page

## Name

vkCmdBeginCustomResolveEXT - Begins a shader resolve operation

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## C Specification

To begin resolving attachments using render pass draws, call:

    // Provided by VK_EXT_custom_resolve with VK_KHR_dynamic_rendering or VK_VERSION_1_3
    void vkCmdBeginCustomResolveEXT(
        VkCommandBuffer                             commandBuffer,
        const VkBeginCustomResolveInfoEXT*          pBeginCustomResolveInfo);

## Parameters

- `commandBuffer` is the command buffer in which to record the command.

- `pBeginCustomResolveInfo` is an optional struct with which to extend functionality.

## Description

Following this call, any `resolveImageView` with `resolveMode` set to `VK_RESOLVE_MODE_CUSTOM_BIT_EXT` will be written by outputs which would otherwise have written to the `imageView` image until the end of the current render pass instance.

Following this call, the fragment area may be reduced to (1,1) if a fragment density map is attached. If this occurs, reads of input attachments mapped to a color, depth, or stencil attachment return the value for the original larger fragment containing the smaller fragment. Reads of input attachments not mapped to a color, depth, or stencil attachment use the new fragment area.

Note | Shader resolve operations allow for custom resolve operations, but overdrawing pixels may have a performance and/or power cost. Furthermore, since the content of any depth/stencil resolve attachment as well as any color resolve attachment is undefined at the beginning of a resolve operation, any depth testing, stencil testing, or blending operation which sources these undefined values also has undefined result value.

Valid Usage

- VUID-vkCmdBeginCustomResolveEXT-commandBuffer-11517
  The current render pass instance must have been started or resumed by vkCmdBeginRendering in this `commandBuffer`

- VUID-vkCmdBeginCustomResolveEXT-None-11518
  vkCmdBeginCustomResolveEXT must not have already been recorded in the current render pass instance

- VUID-vkCmdBeginCustomResolveEXT-None-11519
  The current render pass instance must have specified `VK_RENDERING_CUSTOM_RESOLVE_BIT_EXT`

- VUID-vkCmdBeginCustomResolveEXT-None-11520
  The current render pass instance must not have specified `VK_RENDERING_SUSPENDING_BIT`

Valid Usage (Implicit)

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

- VUID-vkCmdBeginCustomResolveEXT-pBeginCustomResolveInfo-parameter
  If `pBeginCustomResolveInfo` is not `NULL`, `pBeginCustomResolveInfo` must be a valid pointer to a valid VkBeginCustomResolveInfoEXT structure

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

- VUID-vkCmdBeginCustomResolveEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support `VK_QUEUE_GRAPHICS_BIT` operations

- VUID-vkCmdBeginCustomResolveEXT-renderpass
  This command must only be called inside of a render pass instance

- VUID-vkCmdBeginCustomResolveEXT-suspended
  This command must not be called between suspended render pass instances

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

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 | Inside | Outside | VK_QUEUE_GRAPHICS_BIT | Action

Conditional Rendering

vkCmdBeginCustomResolveEXT is affected by conditional rendering

## See Also

VK_EXT_custom_resolve, VK_KHR_dynamic_rendering, VK_VERSION_1_3, VkBeginCustomResolveInfoEXT, VkCommandBuffer

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0