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🌈 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

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