Diligent Engine 2.5 has just been released and adds a number of major improvements:

• Pipeline resource signatures enable applications to define explicit shader resource layouts that allow sharing shader resources between different pipeline states without the need to rebind them.
• Multiple immediate contexts enable async compute and parallel rendering.
• Inline ray tracing (ray queries) is a powerful extension to ray tracing that allows casting rays from regular shaders (pixel, compute, etc.).
• Wave operations enable sharing data between threads in one shader thread group.
• Memoryless framebuffer attachments enable memory savings on mobile platforms.
• Ray tracing is now enabled on Metal

Starting with this release, the API will be much more stable with very few breaking changes expected in the future.

A new tutorial demonstrates how to implement a simple hybrid renderer that combines rasterization with ray tracing.