Taskflow Raytracer

A simple, multithreaded adaptation of Peter Shirley's Ray Tracing in One Weekend using the Taskflow concurrency library.

I modified color.h and camera.h to use Taskflow's for_each_index algorithm.

Performance

I benchmarked the performance difference on my Apple Silicon M2 Macbook, using C++ std::chrono timers.

Results

Implementation	Workers	Execution Time	Speedup
Sequential	1	~19.6s	1.00x
Taskflow	8*	~4.5s	4.35x

*Taskflow defaults to the number of available threads.

Dependencies

• C++20 compatible compiler
• CMake
• Taskflow
• (Optional) Nix package manager, if you want to use the flake.nix

Building and Running

To build the multithreaded version:

cmake -B build -DUSE_TASKFLOW=ON
cmake --build build
./build/raytracer > image.ppm

For the sequential version:

cmake -B build -DUSE_TASKFLOW=OFF
cmake --build build
./build/raytracer > image.ppm