A particle sim with a bunch of profiler-guided optimizations, including:

• A spatial data structure
• GPU acceleration
• Misc GPU data upload/download optimizations
• Aligning data to enable autovectorization
• A thread pool implementation
• An SoA/AoS optimization
• Using a CPU intrinsic
• Frustum culling

On my machine, these optimizations result in:

• 100k particles: 6 ms per frame
• 1M particles: 65 ms per frame

For context, before optimization these numbers were:

• 1k particles: 5 ms per frame
• 10k particles: 190 ms per frame
• 100k particles: frozen

Also supports hot-reloading of shaders and C++ code. (Although I forgot to implement reloading of specifically the fluid sim's compute shaders.)

There are misc minor todos and bugfixes. The big goals I might get to, when I eventually have time:

• Collision with static objects, and more realistic fluid behavior
• Physically-based surface rendering (currently just draws individual particles)

The code is not particularly well-organized. I posted it so that I could point someone to a specific part of the implementation.