# smath

Single-file, header-only linear algebra math library for C++23.

[![Build](https://github.com/slendidev/smath/actions/workflows/build.yml/badge.svg)](https://github.com/slendidev/smath/actions/workflows/build.yml)
[![License: Apache-2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE.txt)
[![C++23](https://img.shields.io/badge/C%2B%2B-23-00599C.svg)](https://en.cppreference.com/w/cpp/23)

## Quick Start

Create `main.cpp`:

```cpp
#include <print>
#include <smath.hpp>

int main() {
  using namespace smath;

  Vec3 a{1.0f, 2.0f, 3.0f};
  Vec3 b{3.0f, 2.0f, 1.0f};

  std::println("a + b = {}", a + b);
  std::println("dot(a, b) = {}", a.dot(b));
  std::println("normalized(a) = {}", a.normalized());
}
```

Build and run:

```bash
g++ -std=c++23 -Iinclude main.cpp -o quickstart
./quickstart
```

## Features

- Generic `Vec<N, T>` class with useful aliases `Vec2/Vec3/Vec4` and friendly accessors (`x/y/z/w`, `r/g/b/a`). They support approx-equal and tuple/structured bindings.
- `std::format` support.
- Compile-time swizzles via `swizzle<"...">`.
- Generic matrix `Mat` class with useful aliases `Mat2/Mat3/Mat4`.
- `Quaternion<T>` built on `Vec4`.
- Angle helpers `rad/deg/turns` respecting a configurable base unit via the macro `SMATH_ANGLE_UNIT`.
- Optional implicit conversions.
- Packing utilities for normalized RGBA (`pack_unorm4x8`, `unpack_snorm4x8`, etc.).
- C++20 modules support.

## License

This library is licensed under the Apache License 2.0. See the [LICENSE.txt](LICENSE.txt) file for more details.