gaming-core/math/View.cpp

#include "math/View.h"

const Matrix& View::update(float lengthAngle, float widthAngle,
                           const Vector3& pos) {
    back.setAngles(lengthAngle, widthAngle);
    right = back.cross(Vector3(0.0f, 1.0f, 0.0f));
    right.normalize();
    up = right.cross(back);
    up.normalize();
    back = -back;

    view.set(0, Vector4(right[0], right[1], right[2], right.dot(-pos)));
    view.set(1, Vector4(up[0], up[1], up[2], up.dot(-pos)));
    view.set(2, Vector4(back[0], back[1], back[2], back.dot(-pos)));
    view.set(3, Vector4(0.0f, 0.0f, 0.0f, 1.0f));
    return view;
}

const Matrix& View::update(const Quaternion& q, const Vector3& pos) {
    up = q * Vector3(0.0f, 1.0f, 0.0f);
    back = q * Vector3(-1.0f, 0.0f, 0.0f);
    right = up.cross(back);
    right.normalize();

    view.set(0, Vector4(right[0], right[1], right[2], right.dot(-pos)));
    view.set(1, Vector4(up[0], up[1], up[2], up.dot(-pos)));
    view.set(2, Vector4(back[0], back[1], back[2], back.dot(-pos)));
    view.set(3, Vector4(0.0f, 0.0f, 0.0f, 1.0f));
    return view;
}

Vector3 View::getUp() const {
    return up;
}

Vector3 View::getDown() const {
    return -up;
}

Vector3 View::getLeft() const {
    return -right;
}

Vector3 View::getRight() const {
    return right;
}

Vector3 View::getFront() const {
    return -back;
}

Vector3 View::getBack() const {
    return back;
}