gui_matrix4.hpp

#ifndef LXGUI_GUI_MATRIX4_HPP
#define LXGUI_GUI_MATRIX4_HPP
 
#include "lxgui/gui_vector2.hpp"
#include "lxgui/lxgui.hpp"
 
#include <initializer_list>
#include <iosfwd>
 
namespace lxgui::gui {
 
struct matrix4f {
    using element_type = float;
 
    matrix4f() noexcept = default;
    matrix4f(std::initializer_list<element_type> list) noexcept;
    explicit matrix4f(const element_type* mat) noexcept;
 
    element_type& operator()(std::size_t row, std::size_t col) noexcept {
        return data[col + row * 4];
    }
 
    element_type operator()(std::size_t row, std::size_t col) const noexcept {
        return data[col + row * 4];
    }
 
    element_type& operator()(std::size_t i) noexcept {
        return data[i];
    }
 
    element_type operator()(std::size_t i) const noexcept {
        return data[i];
    }
 
    void transpose() noexcept;
    void invert() noexcept;
 
    static matrix4f translation(const vector2f& dx) noexcept;
    static matrix4f scaling(const vector2f& scale) noexcept;
    static matrix4f rotation(float rot) noexcept;
    static matrix4f transformation(const vector2f& dx, const vector2f& scale, float rot) noexcept;
    static matrix4f view(const vector2f& window) noexcept;
    static matrix4f view(const vector2f& window, const vector2f& center) noexcept;
 
    static matrix4f transpose(const matrix4f& m) noexcept;
    static matrix4f invert(const matrix4f& m) noexcept;
 
    element_type data[16] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
 
    static const matrix4f identity;
};
 
matrix4f operator+(const matrix4f& m1, const matrix4f& m2) noexcept;
matrix4f operator-(const matrix4f& m1, const matrix4f& m2) noexcept;
matrix4f operator*(const matrix4f& m1, const matrix4f& m2) noexcept;
vector2f operator*(const matrix4f& m, const vector2f& v) noexcept;
vector2f operator*(const vector2f& v, const matrix4f& m) noexcept;
 
std::ostream& operator<<(std::ostream& o, const matrix4f& m);
 
} // namespace lxgui::gui
 
#endif