1// Copyright 2021-2024 The Khronos Group Inc. 2// 3// SPDX-License-Identifier: CC-BY-4.0 4 5include::{generated}/meta/{refprefix}VK_EXT_image_compression_control.adoc[] 6 7=== Other Extension Metadata 8 9*Last Modified Date*:: 10 2022-05-02 11*IP Status*:: 12 No known IP claims. 13*Contributors*:: 14 - Jan-Harald Fredriksen, Arm 15 - Graeme Leese, Broadcom 16 - Andrew Garrard, Imagination 17 - Lisa Wu, Arm 18 - Peter Kohaut, Arm 19 20=== Description 21 22This extension enables fixed-rate image compression and adds the ability to 23control when this kind of compression can be applied. 24Many implementations support some form of framebuffer compression. 25This is typically transparent to applications as lossless compression 26schemes are used. 27With fixed-rate compression, the compression is done at a defined bitrate. 28Such compression algorithms generally produce results that are visually 29lossless, but the results are typically not bit-exact when compared to a 30non-compressed result. 31The implementation may not be able to use the requested compression rate in 32all cases. 33This extension adds a query that can be used to determine the compression 34scheme and rate that was applied to an image. 35 36include::{generated}/interfaces/VK_EXT_image_compression_control.adoc[] 37 38=== Version History 39 40 * Revision 1, 2022-05-02 (Jan-Harald Fredriksen) 41 ** Initial draft 42