Deprecation state
-
Promoted to Vulkan 1.3
Contact
-
Jan-Harald Fredriksen janharaldfredriksen-arm
Other Extension Metadata
- Last Modified Date
-
2019-05-28
- Interactions and External Dependencies
-
-
Promoted to Vulkan 1.3 Core
-
- IP Status
-
No known issues.
- Contributors
-
-
Jan-Harald Fredriksen, Arm
-
Description
This extension adds support for textures compressed using the Adaptive Scalable Texture Compression (ASTC) High Dynamic Range (HDR) profile.
When this extension is enabled, the HDR profile is supported for all ASTC formats listed in ASTC Compressed Image Formats.
New Enum Constants
-
VK_EXT_TEXTURE_COMPRESSION_ASTC_HDR_EXTENSION_NAME
-
VK_EXT_TEXTURE_COMPRESSION_ASTC_HDR_SPEC_VERSION
-
Extending VkFormat:
-
VK_FORMAT_ASTC_10x10_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_10x5_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_10x6_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_10x8_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_12x10_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_12x12_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_5x4_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_5x5_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_6x5_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_6x6_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_8x5_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_8x6_SFLOAT_BLOCK_EXT
-
VK_FORMAT_ASTC_8x8_SFLOAT_BLOCK_EXT
-
-
Extending VkStructureType:
-
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TEXTURE_COMPRESSION_ASTC_HDR_FEATURES_EXT
-
Promotion to Vulkan 1.3
This extension has been partially promoted. Functionality in this extension is included in core Vulkan 1.3, with the EXT suffix omitted. However, the feature is made optional in Vulkan 1.3. The original type, enum and command names are still available as aliases of the core functionality.
Issues
1) Should we add a feature or limit for this functionality?
Yes. It is consistent with the ASTC LDR support to add a feature like textureCompressionASTC_HDR.
The feature is strictly speaking redundant as long as this is just an extension; it would be sufficient to just enable the extension. But adding the feature is more forward-looking if wanted to make this an optional core feature in the future.
2) Should we introduce new format enums for HDR?
Yes.
Vulkan 1.0 describes the ASTC format enums as UNORM, e.g.
VK_FORMAT_ASTC_4x4_UNORM_BLOCK
, so it is confusing to make these
contain HDR data.
Note that the OpenGL (ES) extensions did not make this distinction because a
single ASTC HDR texture may contain both unorm and float blocks.
Implementations may not be able to distinguish between LDR and HDR ASTC
textures internally and just treat them as the same format, i.e. if this
extension is supported then sampling from a
VK_FORMAT_ASTC_4x4_UNORM_BLOCK
image format may return HDR results.
Applications can get predictable results by using the appropriate image
format.
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.