VK_NV_present_barrier

Other Extension Metadata

Last Modified Date

2022-05-16

Contributors

• Liya Li, Nvidia
• Martin Schwarzer, Nvidia
• Andy Wolf, Nvidia
• Ian Williams, Nvidia
• Ben Morris, Nvidia
• James Jones, Nvidia
• Jeff Juliano, Nvidia

Description

This extension adds support for synchronizing corresponding presentation requests across multiple swapchains using the present barrier.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDevicePresentBarrierFeaturesNV
• Extending VkSurfaceCapabilities2KHR:
  • VkSurfaceCapabilitiesPresentBarrierNV
• Extending VkSwapchainCreateInfoKHR:
  • VkSwapchainPresentBarrierCreateInfoNV

New Enum Constants

• VK_NV_PRESENT_BARRIER_EXTENSION_NAME
• VK_NV_PRESENT_BARRIER_SPEC_VERSION
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PRESENT_BARRIER_FEATURES_NV
  • VK_STRUCTURE_TYPE_SURFACE_CAPABILITIES_PRESENT_BARRIER_NV
  • VK_STRUCTURE_TYPE_SWAPCHAIN_PRESENT_BARRIER_CREATE_INFO_NV

Issues

1) Is there a query interface to check if a swapchain is using the present barrier?

RESOLVED. There is no such query interface. When creating a swapchain, an application can specify to use the present barrier, and if the swapchain is created successfully, this swapchain will be using the present barrier.

2) Do we need an extra interface to set up the present barrier across distributed systems?

RESOLVED. If the required hardware is presented in the system, and all settings for the physical synchronization with other systems are set up, an implementation manages the configuration automatically when creating a swapchain, without any extra calls from the application.

Version History

• Revision 1, 2022-07-20
  • Initial version