mat2.h

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#pragma once
 
#include "base/vec2.h"
#include "base/angle.h"
 
 
namespace eu
{
    struct mat2f
    {
        bool operator==(const mat2f& rhs) = delete;
 
        [[nodiscard]] static mat2f from_col_major
        (
            float t00, float t01,
            float t10, float t11
        );
 
        [[nodiscard]] constexpr static mat2f from_row_major
        (
            float t00, float t10,
            float t01, float t11
        )
        {
            return
            {
                t00, t01,
                t10, t11
            };
        }
 
        [[nodiscard]] constexpr static mat2f from_scalar(float scalar)
        {
            const float z = 0;
            return from_row_major
            (
                scalar, z,
                z, scalar
            );
        }
        [[nodiscard]] static mat2f from_stretch_x(float k);
        [[nodiscard]] static mat2f from_stretch_y(float k);
        [[nodiscard]] static mat2f from_rotation(const Angle& a);
 
        float* get_data_ptr();
 
        [[nodiscard]] float get(int row, int col) const;
        [[nodiscard]] vec2f get_column(int c) const;
        [[nodiscard]] vec2f get_row(int r) const;
 
        [[nodiscard]] const float* get_data_ptr() const;
 
        void operator+=(const mat2f& rhs);
        void operator-=(const mat2f& rhs);
 
    private:
        float data[4];
 
        mat2f() = default;
 
        constexpr mat2f
        (
            float t00, float t01,
            float t10, float t11
        )
            : data
            {
                t00, t01,
                t10, t11
            }
        {
        }
    };
 
    constexpr mat2f m2_identity = mat2f::from_scalar(1);
 
 
    std::string to_string(const mat2f& m);
 
    mat2f operator+(const mat2f& lhs, const mat2f& rhs);
    mat2f operator-(const mat2f& lhs, const mat2f& rhs);
    mat2f operator*(const mat2f& lhs, const mat2f& rhs);
    vec2f operator*(const mat2f& lhs, const vec2f& rhs);
}
 
// todo(Gustav): add a multi line format option?
ADD_DEFAULT_FORMATTER(eu::mat2f, std::string, eu::to_string);