VK_AMD_device_coherent_memory

Other Extension Metadata

Last Modified Date

2019-02-04

Contributors

• Ping Fu, AMD
• Timothy Lottes, AMD
• Tobias Hector, AMD

Description

This extension adds the device coherent and device uncached memory types. Any device accesses to device coherent memory are automatically made visible to any other device access. Device uncached memory indicates to applications that caches are disabled for a particular memory type, which guarantees device coherence.

Device coherent and uncached memory are expected to have lower performance for general access than non-device coherent memory, but can be useful in certain scenarios; particularly so for debugging.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceCoherentMemoryFeaturesAMD

New Enum Constants

• VK_AMD_DEVICE_COHERENT_MEMORY_EXTENSION_NAME
• VK_AMD_DEVICE_COHERENT_MEMORY_SPEC_VERSION
• Extending VkMemoryPropertyFlagBits:
  • VK_MEMORY_PROPERTY_DEVICE_COHERENT_BIT_AMD
  • VK_MEMORY_PROPERTY_DEVICE_UNCACHED_BIT_AMD
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_COHERENT_MEMORY_FEATURES_AMD

Version History

• Revision 1, 2019-02-04 (Tobias Hector)
  • Initial revision