Update README with logo

Add logo

CMakeLists.txt

@@ -4,8 +4,14 @@ project(SmathExamples LANGUAGES CXX VERSION 0.1.0)
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-option(BUILD_EXAMPLES "Build example programs" ON)
+option(SMATH_BUILD_EXAMPLES "Build example programs" ON)
-option(BUILD_TESTS "Build unit tests" ON)
+option(SMATH_BUILD_TESTS "Build unit tests" ON)
+option(SMATH_BUILD_MODULES "Enable C++20 modules support" OFF)
+
+if(SMATH_BUILD_MODULES)
+	message(STATUS "Building smath C++ module")
+	add_subdirectory(src/modules)
+endif()
 
 add_library(smath INTERFACE)
 target_include_directories(smath
@@ -55,7 +61,7 @@ install(FILES
 	DESTINATION lib/cmake/smath
 )
 
-if(BUILD_EXAMPLES)
+if(SMATH_BUILD_EXAMPLES)
 	file(GLOB EXAMPLE_SOURCES "${CMAKE_SOURCE_DIR}/examples/*.cpp")
 	foreach(EXAMPLE_FILE ${EXAMPLE_SOURCES})
 		get_filename_component(EXAMPLE_NAME ${EXAMPLE_FILE} NAME_WE)
@@ -64,7 +70,7 @@ if(BUILD_EXAMPLES)
 	endforeach()
 endif()
 
-if(BUILD_TESTS)
+if(SMATH_BUILD_TESTS)
 	enable_testing()
 
 	find_package(GTest QUIET)

README.md

@@ -1,6 +1,43 @@
-# smath
+<p align="center">
+  <img alt="smath logo" src="https://github.com/user-attachments/assets/d6f2ef4b-eca0-4004-9099-37423528bcba" />
+<br><br>
+  <a href="https://github.com/slendidev/smath/actions/workflows/build.yml">
+		<img src="https://github.com/slendidev/smath/actions/workflows/build.yml/badge.svg" alt="Build">
+	</a>
+	<a href="LICENSE.txt">
+		<img src="https://img.shields.io/badge/license-Apache%202.0-blue.svg" alt="License: Apache-2.0">
+	</a>
+	<a href="https://en.cppreference.com/w/cpp/23">
+		<img src="https://img.shields.io/badge/C%2B%2B-23-00599C.svg" alt="C++23">
+	</a>
+</p>
 
-Single-file, header-only linear algebra math library for C++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
 
@@ -12,8 +49,8 @@ Single-file, header-only linear algebra math library for C++23.
 - 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.
+This library is licensed under the Apache License 2.0. See the [LICENSE.txt](LICENSE.txt) file for more details.
-

include/smath.hpp

@@ -188,9 +188,12 @@ public:
 	// NOTE: This can (probably) be improved with C++26 reflection in the
 	// future.
 #define VEC_ACC(component, req, idx) \
-	constexpr auto component() noexcept -> T &requires(N >= req) { \
+	constexpr auto component() noexcept -> T & \
+	requires(N >= req) \
+	{ \
 		return (*this)[idx]; \
-	} constexpr auto component() const->T const & \
+	} \
+	constexpr auto component() const -> T const & \
 	requires(N >= req) \
 	{ \
 		return (*this)[idx]; \
@@ -421,8 +424,9 @@ public:
 	}
 
 	template<class U>
-	requires(std::is_arithmetic_v<U> && N >= 1) constexpr explicit(
+	requires(std::is_arithmetic_v<U> && N >= 1)
-	    !std::is_convertible_v<T, U>) operator Vec<N, U>() const noexcept
+	constexpr explicit(!std::is_convertible_v<T, U>)
+	operator Vec<N, U>() const noexcept
 	{
 		Vec<N, U> r {};
 		for (std::size_t i = 0; i < N; ++i)
@@ -446,9 +450,8 @@ private:
 	}
 #ifdef SMATH_IMPLICIT_CONVERSIONS
 	template<class U>
-	requires std::is_arithmetic_v<U>
+	requires std::is_arithmetic_v<U> && (!std::is_same_v<U, T>)constexpr void
-	    && (!std::is_same_v<U, T>)constexpr void fill_one(
+	fill_one(std::size_t &i, const U &v) noexcept
-	    std::size_t &i, const U &v) noexcept
 	{
 		(*this)[i++] = static_cast<T>(v);
 	}
@@ -577,44 +580,54 @@ using Vec2d = Vec<2, double>;
 using Vec3d = Vec<3, double>;
 using Vec4d = Vec<4, double>;
 
-template<class T> constexpr auto deg(T const value) -> T
+template<class T>
+using angle_ret_t = std::conditional_t<std::is_same_v<T, float>, float, double>;
+
+template<class T> constexpr auto deg(T value)
 {
+	using R = angle_ret_t<T>;
+
 	if constexpr (detail::SMATH_ANGLE_UNIT_ID == detail::AngularUnit::Degrees) {
-		return value;
+		return static_cast<R>(value);
 	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
 	    == detail::AngularUnit::Radians) {
-		return value * static_cast<T>(std::numbers::pi / 180.0);
+		return static_cast<R>(value) * static_cast<R>(std::numbers::pi / 180.0);
-	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
+	} else {
-	    == detail::AngularUnit::Turns) {
+		return static_cast<R>(value) / static_cast<R>(360.0);
-		return value / static_cast<T>(360.0);
 	}
 }
 
-template<class T> constexpr auto rad(T const value) -> T
+template<class T> constexpr auto rad(T value)
 {
+	using R = angle_ret_t<T>;
+
 	if constexpr (detail::SMATH_ANGLE_UNIT_ID == detail::AngularUnit::Degrees) {
-		return value * static_cast<T>(180.0 / std::numbers::pi);
+		return static_cast<R>(value) * static_cast<R>(180.0 / std::numbers::pi);
 	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
 	    == detail::AngularUnit::Radians) {
-		return value;
+		return static_cast<R>(value);
-	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
+	} else {
-	    == detail::AngularUnit::Turns) {
+		return static_cast<R>(value)
-		return value / (static_cast<T>(2.0) * static_cast<T>(std::numbers::pi));
+		    / (static_cast<R>(2.0) * static_cast<R>(std::numbers::pi));
 	}
 }
 
-template<class T> constexpr auto turns(T const value) -> T
+template<class T> constexpr auto turns(T value)
 {
+	using R = angle_ret_t<T>;
+
 	if constexpr (detail::SMATH_ANGLE_UNIT_ID == detail::AngularUnit::Degrees) {
-		return value * static_cast<T>(360.0);
+		return static_cast<R>(value) * static_cast<R>(360.0);
 	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
 	    == detail::AngularUnit::Radians) {
-		return value * (static_cast<T>(2.0) * static_cast<T>(std::numbers::pi));
+		return static_cast<R>(value)
-	} else if constexpr (detail::SMATH_ANGLE_UNIT_ID
+		    * (static_cast<R>(2.0) * static_cast<R>(std::numbers::pi));
-	    == detail::AngularUnit::Turns) {
+	} else {
-		return value;
+		return static_cast<R>(value);
 	}
 }
+template<std::size_t R, std::size_t C, typename T>
+requires std::is_arithmetic_v<T> struct Mat;
 
 template<class T> struct Quaternion : Vec<4, T> {
 	using Base = Vec<4, T>;
@@ -625,9 +638,13 @@ template<class T> struct Quaternion : Vec<4, T> {
 	constexpr Base const &vec() const noexcept { return *this; }
 
 	constexpr T &x() noexcept { return Base::x(); }
+	constexpr T const &x() const noexcept { return Base::x(); }
 	constexpr T &y() noexcept { return Base::y(); }
+	constexpr T const &y() const noexcept { return Base::y(); }
 	constexpr T &z() noexcept { return Base::z(); }
+	constexpr T const &z() const noexcept { return Base::z(); }
 	constexpr T &w() noexcept { return Base::w(); }
+	constexpr T const &w() const noexcept { return Base::w(); }
 
 	constexpr auto operator*(Quaternion const &rhs) const noexcept -> Quaternion
 	{
@@ -645,6 +662,42 @@ template<class T> struct Quaternion : Vec<4, T> {
 
 		return r;
 	}
+
+	[[nodiscard]] constexpr auto as_matrix() const noexcept -> Mat<4, 4, T>
+	{
+		auto const xx = x() * x();
+		auto const yy = y() * y();
+		auto const zz = z() * z();
+		auto const xy = x() * y();
+		auto const xz = x() * z();
+		auto const yz = y() * z();
+		auto const wx = w() * x();
+		auto const wy = w() * y();
+		auto const wz = w() * z();
+
+		return Mat<4, 4, T> {
+			Vec<4, T> { 1 - 2 * (yy + zz), 2 * (xy + wz), 2 * (xz - wy), 0 },
+			Vec<4, T> { 2 * (xy - wz), 1 - 2 * (xx + zz), 2 * (yz + wx), 0 },
+			Vec<4, T> { 2 * (xz + wy), 2 * (yz - wx), 1 - 2 * (xx + yy), 0 },
+			Vec<4, T> { 0, 0, 0, 1 },
+		};
+	}
+
+	[[nodiscard]] static constexpr auto from_axis_angle(
+	    Vec<3, T> const &axis, T const angle) noexcept -> Quaternion
+	{
+		auto const normalized_axis { axis.normalized_safe() };
+		auto const half_angle { angle / static_cast<T>(2) };
+		auto const sine { std::sin(half_angle) };
+		auto const cosine { std::cos(half_angle) };
+
+		return Quaternion {
+			normalized_axis.x() * sine,
+			normalized_axis.y() * sine,
+			normalized_axis.z() * sine,
+			cosine,
+		};
+	}
 };
 
 template<class T>
@@ -1096,28 +1149,18 @@ inline auto matrix_perspective(
 
 template<typename T>
 [[nodiscard]] inline auto matrix_look_at(Vec<3, T> const eye,
-    Vec<3, T> const center, Vec<3, T> const up, bool flip_z_axis = false)
+    Vec<3, T> const center, Vec<3, T> const up) -> Mat<4, 4, T>
-    -> Mat<4, 4, T>
 {
-	auto f = (center - eye).normalized();
+	auto f = (center - eye).normalized_safe();
-	auto s = f.cross(up).normalized();
+	auto s = f.cross(up).normalized_safe();
 	auto u = s.cross(f);
 
-	if (!flip_z_axis) {
 	return Mat<4, 4, T> {
-			Vec<4, T> { s.x(), s.y(), s.z(), 0 },
+		Vec<4, T> { s.x(), u.x(), -f.x(), 0 },
-			Vec<4, T> { u.x(), u.y(), u.z(), 0 },
+		Vec<4, T> { s.y(), u.y(), -f.y(), 0 },
-			Vec<4, T> { -f.x(), -f.y(), -f.z(), 0 },
+		Vec<4, T> { s.z(), u.z(), -f.z(), 0 },
 		Vec<4, T> { -s.dot(eye), -u.dot(eye), f.dot(eye), 1 },
 	};
-	} else {
-		return Mat<4, 4, T> {
-			Vec<4, T> { s.x(), s.y(), s.z(), 0 },
-			Vec<4, T> { u.x(), u.y(), u.z(), 0 },
-			Vec<4, T> { f.x(), f.y(), f.z(), 0 },
-			Vec<4, T> { -s.dot(eye), -u.dot(eye), -f.dot(eye), 1 },
-		};
-	}
 }
 
 template<typename T>

src/modules/CMakeLists.txt

@@ -0,0 +1,8 @@
+add_library(smath_modules)
+
+target_sources(smath_modules PUBLIC FILE_SET CXX_MODULES FILES smath.cppm)
+
+target_link_libraries(smath_modules PUBLIC smath::smath)
+
+target_compile_features(smath_modules PUBLIC cxx_std_20)
+

src/modules/smath.cppm

@@ -0,0 +1,54 @@
+module;
+
+#include "smath.hpp"
+
+export module smath;
+
+export namespace smath {
+export using ::smath::Vec;
+export using ::smath::VecOrScalar;
+export using ::smath::Quaternion;
+export using ::smath::Mat;
+
+export using ::smath::Vec2;
+export using ::smath::Vec3;
+export using ::smath::Vec4;
+
+export using ::smath::Vec2d;
+export using ::smath::Vec3d;
+export using ::smath::Vec4d;
+
+export using ::smath::Mat2;
+export using ::smath::Mat3;
+export using ::smath::Mat4;
+
+export using ::smath::Mat2d;
+export using ::smath::Mat3d;
+export using ::smath::Mat4d;
+
+export using ::smath::swizzle;
+
+export using ::smath::deg;
+export using ::smath::rad;
+export using ::smath::turns;
+
+export using ::smath::pack_unorm4x8;
+export using ::smath::pack_snorm4x8;
+export using ::smath::unpack_unorm4x8;
+export using ::smath::unpack_snorm4x8;
+
+export using ::smath::operator*;
+
+export using ::smath::translate;
+export using ::smath::rotate;
+export using ::smath::scale;
+
+export using ::smath::shear_x;
+export using ::smath::shear_y;
+export using ::smath::shear_z;
+
+export using ::smath::matrix_ortho3d;
+export using ::smath::matrix_perspective;
+export using ::smath::matrix_infinite_perspective;
+export using ::smath::matrix_look_at;
+}