VK_EXT_image_compression_control

Other Extension Metadata

Last Modified Date

2022-05-02

IP Status

No known IP claims.

Contributors

• Jan-Harald Fredriksen, Arm
• Graeme Leese, Broadcom
• Andrew Garrard, Imagination
• Lisa Wu, Arm
• Peter Kohaut, Arm

Description

This extension enables fixed-rate image compression and adds the ability to control when this kind of compression can be applied. Many implementations support some form of framebuffer compression. This is typically transparent to applications as lossless compression schemes are used. With fixed-rate compression, the compression is done at a defined bitrate. Such compression algorithms generally produce results that are visually lossless, but the results are typically not bit-exact when compared to a non-compressed result. The implementation may not be able to use the requested compression rate in all cases. This extension adds a query that can be used to determine the compression scheme and rate that was applied to an image.

New Commands

• vkGetImageSubresourceLayout2EXT

New Structures

• VkImageSubresource2EXT
• VkSubresourceLayout2EXT
• Extending VkImageCreateInfo, VkSwapchainCreateInfoKHR, VkPhysicalDeviceImageFormatInfo2:
  • VkImageCompressionControlEXT
• Extending VkImageFormatProperties2, VkSurfaceFormat2KHR, VkSubresourceLayout2KHR:
  • VkImageCompressionPropertiesEXT
• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceImageCompressionControlFeaturesEXT

New Enums

• VkImageCompressionFixedRateFlagBitsEXT
• VkImageCompressionFlagBitsEXT

New Bitmasks

• VkImageCompressionFixedRateFlagsEXT
• VkImageCompressionFlagsEXT

New Enum Constants

• VK_EXT_IMAGE_COMPRESSION_CONTROL_EXTENSION_NAME
• VK_EXT_IMAGE_COMPRESSION_CONTROL_SPEC_VERSION
• Extending VkResult:
  • VK_ERROR_COMPRESSION_EXHAUSTED_EXT
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_IMAGE_COMPRESSION_CONTROL_EXT
  • VK_STRUCTURE_TYPE_IMAGE_COMPRESSION_PROPERTIES_EXT
  • VK_STRUCTURE_TYPE_IMAGE_SUBRESOURCE_2_EXT
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_IMAGE_COMPRESSION_CONTROL_FEATURES_EXT
  • VK_STRUCTURE_TYPE_SUBRESOURCE_LAYOUT_2_EXT

Version History

• Revision 1, 2022-05-02 (Jan-Harald Fredriksen)
  • Initial draft