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DirectXMath
DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
Nice writeup with helpful diagrams, thanks for sharing!
Readers might also find this short intro [1] helpful, including tips on porting. (Disclosure: author)
1: https://github.com/google/highway/blob/master/g3doc/highway_...
> many available instructions are missing from the wrappers
Highway can interop with platform-specific intrinsics (on x86/ARM, hwy_vec.raw is the native intrinsic type).
> vectorized integer math often treats vectors as having different lanes count on every line of code
Fair point, that's a cost of type safety. We usually write `auto` to avoid spelling it out.
Switching compilers is often too high-risk, but there are header-only libraries that get you most of the same benefits with normal C++ and wrappers around the intrinsics: https://github.com/richgel999/CppSPMD_Fast
For videogame applications, look there before writing these intrinsics: https://github.com/microsoft/DirectXMath/ That library already implements a lot of complicated things, relatively well.
Here’s for frustum culling https://github.com/microsoft/DirectXMath/blob/jan2021/Inc/Di... Relatively inefficient when you have many boxes to test against same frustum, but (a) compiler may inline and optimize (b) failing that, it’s easy to copy-paste and optimize manually, compute these 6 planes and call BoundingBox::ContainedBy method yourself.