| // Copyright (c) 2021 The Khronos Group Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_KHR_format_feature_flags2.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2021-07-01 |
| *IP Status*:: |
| No known IP claims. |
| *Contributors*:: |
| - Lionel Landwerlin, Intel |
| - Jason Ekstrand, Intel |
| - Tobias Hector, AMD |
| - Spencer Fricke, Samsung Electronics |
| - Graeme Leese, Broadcom |
| - Jan-Harald Fredriksen, ARM |
| |
| === Description |
| |
| This extension adds a new elink:VkFormatFeatureFlagBits2KHR 64bits format |
| feature flag type to extend the existing elink:VkFormatFeatureFlagBits which |
| is limited to 31 flags. |
| At the time of this writing 29 bits of elink:VkFormatFeatureFlagBits are |
| already used. |
| |
| Because slink:VkFormatProperties2 is already defined to extend the Vulkan |
| 1.0 flink:vkGetPhysicalDeviceFormatProperties entry point, this extension |
| defines a new slink:VkFormatProperties3KHR to extend the |
| slink:VkFormatProperties. |
| |
| On top of replicating all the bits from elink:VkFormatFeatureFlagBits, |
| elink:VkFormatFeatureFlagBits2KHR adds the following bits : |
| |
| * ename:VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT_KHR and |
| ename:VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT_KHR indicate |
| that an implementation supports respectively reading and writing a given |
| elink:VkFormat through storage operations without specifying the format |
| in the shader. |
| |
| * ename:VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_DEPTH_COMPARISON_BIT_KHR |
| indicates that an implementation supports depth comparison performed by |
| code:OpImage*Dref instructions on a given elink:VkFormat. |
| Previously the result of executing a code:OpImage*Dref* instruction on |
| an image view, where the pname:format was not one of the depth/stencil |
| formats with a depth component, was undefined. |
| This bit clarifies on which formats such instructions can be used. |
| |
| include::{generated}/interfaces/VK_KHR_format_feature_flags2.txt[] |
| |
| === Version History |
| |
| * Revision 1, 2020-07-21 (Lionel Landwerlin) |
| - Initial draft |
