VK_QCOM_render_pass_store_ops(3)

# VK_QCOM_render_pass_store_ops(3) Manual Page

## Name

VK_QCOM_render_pass_store_ops - device extension

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## Registered Extension Number

302

## Revision

2

## Extension and Version Dependencies

- Requires Vulkan 1.0

## Contact

- Bill Licea-Kane wwlk

## Other Extension Metadata

Last Modified Date

  2020-03-25

Contributors

  - Bill Licea-Kane, Qualcomm Technologies, Inc.

## Description

Renderpass attachments can be read-only for the duration of a render pass.

Examples include input attachments and depth attachments where depth tests are enabled but depth writes are not enabled.

In such cases, there can be no contents generated for an attachment within the render area.

This extension adds a new VkAttachmentStoreOp `VK_ATTACHMENT_STORE_OP_NONE_QCOM` specifying that the contents within the render area may not be written to memory, but that the prior contents of the attachment in memory are preserved. However, if any contents were generated within the render area during rendering, the contents of the attachment will be undefined inside the render area.

| Note The VkAttachmentStoreOp `VK_ATTACHMENT_STORE_OP_STORE` may force an implementation to assume that the attachment was written and force an implementation to flush data to memory or to a higher level cache. The VkAttachmentStoreOp `VK_ATTACHMENT_STORE_OP_NONE_QCOM` may allow an implementation to assume that the attachment was not written and allow an implementation to avoid such a flush..

## New Enum Constants

- `VK_QCOM_RENDER_PASS_STORE_OPS_EXTENSION_NAME`

- `VK_QCOM_RENDER_PASS_STORE_OPS_SPEC_VERSION`

- Extending VkAttachmentStoreOp:

  - `VK_ATTACHMENT_STORE_OP_NONE_QCOM`

## Version History

- Revision 1, 2019-12-20 (wwlk)

  - Initial version

- Revision 2, 2020-03-25 (wwlk)

  - Minor renaming

## See Also

No cross-references are available

## Document Notes

For more information, see the Vulkan Specification

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

## Copyright

Copyright 2014-2022 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0