Mat3.hpp

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// Copyright 2021-2023 Jan Niklas Hasse <jhasse@bixense.com>
// For conditions of distribution and use, see copyright notice in LICENSE.txt
#pragma once
 
#include <boost/qvm_lite.hpp>
#include <initializer_list>
 
namespace jngl {
 
class Pixels;
class Vec2;
 
class Mat3 {
public:
    Mat3() = default;
 
    Mat3(std::initializer_list<float>);
 
    Mat3& translate(const Vec2& v);
 
    Mat3& translate(Pixels x, Pixels y);
 
    Mat3& scale(float factor);
 
    Mat3& scale(float xfactor, float yfactor);
 
    Mat3& rotate(float radian);
 
    float data[9] = { 1, 0, 0, 0, 1, 0, 0, 0, 1 };
};
 
} // namespace jngl
 
namespace boost::qvm {
template <> struct mat_traits<jngl::Mat3> {
    static int const rows = 3;
    static int const cols = 3;
    using scalar_type = float;
 
    template <int R, int C> static scalar_type read_element(const jngl::Mat3& m) {
        return m.data[C * 3 + R];
    }
    template <int R, int C> static scalar_type& write_element(jngl::Mat3& m) {
        return m.data[C * 3 + R];
    }
};
} // namespace boost::qvm