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This optional functionality is intended to be used by tools and not by applications directly.

accelerationStructureCaptureReplay indicates whether the implementation supports saving and reusing acceleration structure device addresses for trace capture and replay.

This is required by all implementations supporting this extension.

accelerationStructure indicates whether the implementation supports the acceleration structure functionality.

The features of this extension are described by the VkPhysicalDeviceAccelerationStructureFeaturesKHR structure: The VK_KHR_acceleration_structure extension provides a common base for acceleration functionality that is used by both the VK_KHR_ray_tracing_pipeline and VK_KHR_ray_query extensions. Some of this functionality is optional, so be sure to check for the supported features and properties on your driver!

VK_KHR_ray_query - providing ray query intrinsics for all shader stages.

VK_KHR_ray_tracing_pipeline - providing ray tracing shader stages and pipelines, and.

VK_KHR_acceleration_structure - which provides functionality for acceleration structure building and management.

The Vulkan Ray Tracing functionality consists of a number of Vulkan, SPIR-V, and GLSL extensions. Introduction to the Vulkan Ray Tracing Extensions It also improves the overall lighting in the scene and eliminates the lighting artifacts on the sides and floor of the doorway.

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Note the improved reflections on the metal walls, on the floor through the doorway, and on the windows inside the room. We look forward to seeing how you put these extensions to use! Figure 1: Wolfenstein: Youngblood - Ray Tracing OFF Figure 2: Wolfenstein: Youngblood - Ray Tracing ON. There are many additional innovative techniques that can leverage an accelerated ray tracing framework, including non-rendering techniques.

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Vulkan Ray Tracing can also be used for accelerating offline production rendering and creative tools, for example offline light-map baking. See Figures 1 and 2 for an example of hybrid rendering using Vulkan in Wolfenstein: Youngblood. Some examples include rasterization post-processing after tracing primary rays, using ray tracing for shadow map generation, and dynamic light baking asynchronously with other system tasks. One critical use case for Vulkan Ray Tracing is real-time ray tracing in games - typically using a hybrid combination of a rasterized scene with some ray traced aspects. Consequently we used a familiar overall architecture, including the re-use of HLSL shaders, while also introducing new functionality and implementation flexibility.

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ISVs were also very clear-we needed to enable content using contemporary proprietary APIs, such as NVIDIA OptiX™ or Microsoft DirectX Raytracing, to be easily portable to Vulkan.

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For this first version, we are primarily aiming to expose the full functionality of modern desktop hardware.

We enabled selected parts of the framework to be optional for deployment flexibility in keeping with the Vulkan philosophy. One overarching design goal was to provide a single, coherent cross-platform and multi-vendor framework for ray tracing acceleration that could be easily used together with existing Vulkan API functionality. Real-time techniques for ray tracing are still being actively researched and so the first version of Vulkan Ray Tracing has been designed to provide an effective framework, while setting an extensible stage for future developments. The TSG received a number of design contributions from IHVs and examined requirements from both ISVs and IHVs. On November 23, 2020, the final specifications were released and on Decemthe Vulkan 1.2.162.0 SDK was announced, which incorporated support for these extensions, enabling developers to be able to easily integrate Vulkan Ray Tracing into their applications. In March 2020, the provisional ray tracing extensions were released to gather public review and input into the final design of these extensions. The Ray Tracing TSG was formed in early 2018 and tasked to bring a tightly integrated, cross-vendor, ray tracing solution to Vulkan. This blog summarizes how the Vulkan Ray Tracing extensions were developed, and illustrates how they can be used by developers to bring ray tracing functionality to their applications. The Khronos Vulkan Ray Tracing Task Sub Group (TSG) has developed and released a set of extensions that seamlessly integrate ray tracing functionality into the existing Vulkan framework.

Introduction to the Vulkan Ray Tracing Extensions.

Vulkan SDK shipping today with ray tracing support including Validation Layers. This blog has been updated to include the latest techniques available (Originally posted March 17, 2020).