Preliminary issue to track feature support for ray tracing.

• https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_KHR_ray_tracing_pipeline.html
• https://www.khronos.org/blog/vulkan-ray-tracing-final-specification-release
• https://docs.microsoft.com/en-us/windows/win32/direct3d12/direct3d-12-raytracing

Similar to compute pipelines, raytracing may need its own pipeline type, layout and shader programs.

Since this is a large-scale feature, the following bullets approximately track the progress:

• Acceleration structures
  • Support GPU virtual addresses in Vulkan and expose them to the buffer interfaces.
  • BLAS and TLAS structures.
  • Instance and Geometry flags.
  • Barrier support
  • Copying and compaction
  • Allow multiple acceleration structures to be stored in a single buffer.
  • Allow acceleration structure buffer release (backing buffers can be moved out of their acceleration structures, buffers for building can be released on demand).
• Ray tracing pipeline
  • Barrier support
  • Shader binding tables
  • Pipeline implementation
    • Vulkan
    • DirectX 12
• General
  • Matrix type
  • Inline Ray Tracing (Ray Queries)
  • Runtime option (instead of compile-time option)