ecsgame/ECS/Components/Transform.h

//
// Created by karl on 04.01.20.
//

#ifndef ECSGAME_TRANSFORM_H
#define ECSGAME_TRANSFORM_H

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

#include "glm/gtx/string_cast.hpp"

struct Transform {
    Transform() = default;

    glm::mat4 matrix = glm::mat4(1.0f); // Initialize as identity
    glm::vec3 origin = glm::vec3(0.0f, 0.0f, 0.0f);

    void translate(glm::vec3 offset) { matrix = glm::translate(matrix, offset); }

    glm::vec3 get_translation() { return glm::vec3(matrix[3]); }

    void uniform_scale(float factor) { scale(glm::vec3(factor, factor, factor)); }

    void scale(glm::vec3 factors) { matrix = glm::scale(matrix, factors); }

    void rotate(float degrees, glm::vec3 axis) {
        matrix = glm::rotate(matrix, glm::radians(degrees), axis);
    }

    void set_origin(glm::vec3 position) { origin = position; }

    void add_to_origin(glm::vec3 addition) { origin += addition; }

    void set_rotation_from_quat(glm::quat quaternion) {
        // Remember translation
        glm::vec4 save = matrix[3];

        matrix = glm::mat4_cast(quaternion);
        matrix[3] = save;
    }

    glm::vec3 get_origin() const { return origin; }

    glm::vec3 forward() const { return matrix * glm::vec4(0.0, 0.0, -1.0, 0.0); }

    glm::vec3 up() const { return matrix * glm::vec4(0.0, 1.0, 0.0, 0.0); }

    glm::vec3 right() const { return matrix * glm::vec4(1.0, 0.0, 0.0, 0.0); }
};

#endif // ECSGAME_TRANSFORM_H