# VkBufferCollectionConstraintsInfoFUCHSIA(3) Manual Page

## Name

VkBufferCollectionConstraintsInfoFUCHSIA - Structure of general buffer collection constraints

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## C Specification

The `VkBufferCollectionConstraintsInfoFUCHSIA` structure is defined as:

    // Provided by VK_FUCHSIA_buffer_collection
    typedef struct VkBufferCollectionConstraintsInfoFUCHSIA {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           minBufferCount;
        uint32_t           maxBufferCount;
        uint32_t           minBufferCountForCamping;
        uint32_t           minBufferCountForDedicatedSlack;
        uint32_t           minBufferCountForSharedSlack;
    } VkBufferCollectionConstraintsInfoFUCHSIA;

## Members

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

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

- `minBufferCount` is the minimum number of buffers available in the collection

- `maxBufferCount` is the maximum number of buffers allowed in the collection

- `minBufferCountForCamping` is the per-participant minimum buffers for camping

- `minBufferCountForDedicatedSlack` is the per-participant minimum buffers for dedicated slack

- `minBufferCountForSharedSlack` is the per-participant minimum buffers for shared slack

## Description

Sysmem uses all buffer count parameters in combination to determine the number of buffers it will allocate. Sysmem defines buffer count constraints in `fuchsia.sysmem/constraints.fidl`.

Camping as referred to by `minBufferCountForCamping`, is the number of buffers that should be available for the participant that are not for transient use. This number of buffers is required for the participant to logically operate.

Slack as referred to by `minBufferCountForDedicatedSlack` and `minBufferCountForSharedSlack`, refers to the number of buffers desired by participants for optimal performance. `minBufferCountForDedicatedSlack` refers to the current participant. `minBufferCountForSharedSlack` refers to buffer slack for all participants in the collection.

Valid Usage (Implicit)

- VUID-VkBufferCollectionConstraintsInfoFUCHSIA-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_BUFFER_COLLECTION_CONSTRAINTS_INFO_FUCHSIA`

- VUID-VkBufferCollectionConstraintsInfoFUCHSIA-pNext-pNext
  `pNext` must be `NULL`

## See Also

VK_FUCHSIA_buffer_collection, VkBufferConstraintsInfoFUCHSIA, VkImageConstraintsInfoFUCHSIA, 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