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## Extension and Version Dependencies

• Requires Vulkan 1.0

• Requires VK_FUCHSIA_external_memory

• Requires VK_KHR_sampler_ycbcr_conversion

## Contact

2021-09-23

IP Status

No known IP claims.

Contributors

## Description

A buffer collection is a collection of one or more buffers which were allocated together as a group and which all have the same properties. These properties describe the buffers' internal representation such as its dimensions and memory layout. This ensures that all of the buffers can be used interchangeably by tasks that require swapping among multiple buffers, such as double-buffered graphics rendering.

By sharing such a collection of buffers between components, communication about buffer lifecycle can be made much simpler and more efficient. For example, when a content producer finishes writing to a buffer, it can message the consumer of the buffer with the buffer index, rather than passing a handle to the shared memory.

On Fuchsia, the Sysmem service uses buffer collections as a core construct in its design. VK_FUCHSIA_buffer_collection is the Vulkan extension that allows Vulkan applications to interoperate with the Sysmem service on Fuchsia.

## New Enum Constants

• VK_FUCHSIA_BUFFER_COLLECTION_EXTENSION_NAME

• VK_FUCHSIA_BUFFER_COLLECTION_SPEC_VERSION

• Extending VkDebugReportObjectTypeEXT:

• VK_DEBUG_REPORT_OBJECT_TYPE_BUFFER_COLLECTION_FUCHSIA_EXT

• Extending VkObjectType:

• VK_OBJECT_TYPE_BUFFER_COLLECTION_FUCHSIA

• Extending VkStructureType:

• VK_STRUCTURE_TYPE_BUFFER_COLLECTION_BUFFER_CREATE_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_BUFFER_COLLECTION_CONSTRAINTS_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_BUFFER_COLLECTION_CREATE_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_BUFFER_COLLECTION_IMAGE_CREATE_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_BUFFER_COLLECTION_PROPERTIES_FUCHSIA

• VK_STRUCTURE_TYPE_BUFFER_CONSTRAINTS_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_IMAGE_CONSTRAINTS_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_IMAGE_FORMAT_CONSTRAINTS_INFO_FUCHSIA

• VK_STRUCTURE_TYPE_IMPORT_MEMORY_BUFFER_COLLECTION_FUCHSIA

• VK_STRUCTURE_TYPE_SYSMEM_COLOR_SPACE_FUCHSIA

## Issues

1) When configuring a VkImageConstraintsInfoFUCHSIA structure for constraint setting, should a NULL pFormatConstraints parameter be allowed ?

RESOLVED: No. Specifying a NULL pFormatConstraints results in logical complexity of interpreting the relationship between the VkImageCreateInfo::usage settings of the elements of the pImageCreateInfos array and the implied or desired VkFormatFeatureFlags.

The explicit requirement for pFormatConstraints to be non-NULL simplifies the implied logic of the implementation and expectations for the Vulkan application.

## Version History

• Revision 2, 2021-09-23 (John Rosasco)

• Review passes

• Revision 1, 2021-03-09 (John Rosasco)

• Initial revision

## Document Notes

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

Copyright 2014-2022 The Khronos Group Inc.