🌈 Vulkan raytracing with liblava

Features

Support for the Vulkan KHR ray tracing extensions, integrated into liblava with idiomatic wrappers in lava::extras::raytracing.

Acceleration structures

• abstraction over VK_KHR_acceleration_structure
• bottom_level_acceleration_structure (BLAS) and top_level_acceleration_structure (TLAS) objects to
  • create
  • build
  • update
  • compact

Raytracing pipeline

• abstraction over VK_KHR_ray_tracing_pipeline
• raytracing_pipeline object with support for shader groups

Shader binding table

• shader_binding_table object to automatically

  • generate SBT layout with correct alignments
  • fill SBT with shader group handles
  • and shader record data (parameters)

  from a raytracing_pipeline

Demo

raytracing cubes • raytraced reflecting cubes

This demo showcases:

• BLAS and TLAS creation
• BLAS compaction
• TLAS update each frame with transformation matrices
• callable shader
• SBT shader records

Build it with:

mkdir build & cd build
cmake ..
cmake --build . --parallel

To recompile shaders, run the appropriate gen_spirv script in demo/res/cubes.

TODO

Non-exhaustive list:

• host command support for acceleration structures
• serialization support
• test intersection shaders
• move SBT to device-local memory