# VkSubpassResolvePerformanceQueryEXT(3) Manual Page

## Name

VkSubpassResolvePerformanceQueryEXT - Structure specifying the efficiency of subpass resolve for an attachment with a format

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## C Specification

To query the performance characteristics of a subpass resolve operation for an attachment with a VkFormat, add a VkSubpassResolvePerformanceQueryEXT structure to the `pNext` chain of VkFormatProperties2.

The VkSubpassResolvePerformanceQueryEXT structure is defined as:

    // Provided by VK_EXT_multisampled_render_to_single_sampled
    typedef struct VkSubpassResolvePerformanceQueryEXT {
        VkStructureType    sType;
        void*              pNext;
        VkBool32           optimal;
    } VkSubpassResolvePerformanceQueryEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `optimal` specifies that a subpass resolve operation is optimally performed.

## Description

If `optimal` is `VK_FALSE` for a VkFormat, using a subpass resolve operation on a multisampled attachment with this format can incur additional costs, including additional memory bandwidth usage and a higher memory footprint. If an attachment with such a format is used in a multisampled-render-to-single-sampled subpass, the additional memory and memory bandwidth usage can nullify the benefits of using the `VK_EXT_multisampled_render_to_single_sampled` extension.

Valid Usage (Implicit)

- VUID-VkSubpassResolvePerformanceQueryEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_SUBPASS_RESOLVE_PERFORMANCE_QUERY_EXT`

## See Also

VK_EXT_multisampled_render_to_single_sampled, VkBool32, VkStructureType

## 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