1// Copyright 2019-2021 The Khronos Group Inc. 2// 3// SPDX-License-Identifier: CC-BY-4.0 4 5include::{generated}/meta/{refprefix}VK_EXT_image_robustness.txt[] 6 7=== Other Extension Metadata 8 9*Last Modified Date*:: 10 2020-04-27 11*IP Status*:: 12 No known IP claims. 13*Contributors*:: 14 - Graeme Leese, Broadcom 15 - Jan-Harald Fredriksen, ARM 16 - Jeff Bolz, NVIDIA 17 - Spencer Fricke, Samsung 18 - Courtney Goeltzenleuchter, Google 19 - Slawomir Cygan, Intel 20 21=== Description 22 23This extension adds stricter requirements for how out of bounds reads from 24images are handled. 25Rather than returning undefined values, most out of bounds reads return R, 26G, and B values of zero and alpha values of either zero or one. 27Components not present in the image format may be set to zero or to values 28based on the format as described in <<textures-conversion-to-rgba, 29Conversion to RGBA>>. 30 31include::{generated}/interfaces/VK_EXT_image_robustness.txt[] 32 33=== Issues 34 351. How does this extension differ from VK_EXT_robustness2? 36 37The guarantees provided by this extension are a subset of those provided by 38the robustImageAccess2 feature of VK_EXT_robustness2. 39Where this extension allows return values of (0, 0, 0, 0) or (0, 0, 0, 1), 40robustImageAccess2 requires that a particular value dependent on the image 41format be returned. 42This extension provides no guarantees about the values returned for an 43access to an invalid Lod. 44 45=== Examples 46 47None. 48 49=== Version History 50 51 * Revision 1, 2020-04-27 (Graeme Leese) 52 - Initial draft 53