camera.h

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#pragma once
#include "transformations.h"
class camera {
  public:
    vec3 viewDir;
    vec3 up;
    float pitchAngle;
 
    vec3 eye;
    float nearPoint{-1}, farPoint{-10};
    float FOV{90};
    float sensitivity = 0.000005;
    float speed = 0.00001;
 
    camera() : viewDir(0.0f, 0.0f, -1.0f), eye(0.0f, 0.0f, 20.0f), up(0.0f, 1.0f, 0.0f), pitchAngle(0) {
        checkCorrectness();
    }
 
    camera(const vec3 &pos, const vec3 &up, const vec3 &dir) : viewDir(dir), up(vec3::normalize(up)), eye(pos), pitchAngle(0) {
        checkCorrectness();
    }
 
    void changeDir(vec3 dir) {
        viewDir = std::move(dir);
        up = vec3(0, 1, 0);
        correct();
    }
 
    void newDelYaw(float angle_in_deg) {
        auto rot = trans::rotation(angle_in_deg * radian, up);
        viewDir = rot * (vec4)viewDir;
        viewDir.normalize();
        up = vec3(0, 1, 0);
        correct();
    }
 
    void DelRoll(float angle_in_deg) {
        up = trans::rotation(angle_in_deg * radian, (viewDir)) * (vec4)up;
        up.normalize();
    }
 
    void DelYaw(float angle_in_deg) {
        auto rot = trans::rotation(angle_in_deg * radian, up);
        viewDir = rot * (vec4)viewDir;
        viewDir.normalize();
    }
 
    void DelPitch(float angle_in_deg) {
        if (pitchAngle + angle_in_deg > 90) {
            pitchAngle = 90;
        } else if (pitchAngle + angle_in_deg < -90) {
            pitchAngle = -90;
        } else {
            vec3 right = vec3::cross(viewDir, up);
            auto rot = trans::rotation(angle_in_deg * radian, right);
            up = vec3(rot * (vec4)up);
            viewDir = vec3(rot * (vec4)viewDir);
            viewDir.normalize();
            auto dot = vec3::dot(viewDir, vec3(0, 1, 0));
            pitchAngle = 90 - acosf(dot) * 180 / pi;
        }
    }
 
    vec3 getUp() const { return up; }
    vec3 getViewDir() const { return viewDir; }
 
  private:
    inline void checkCorrectness() {
        auto dot = vec3::dot(viewDir, up);
        if (dot > epsilon && dot < -epsilon) {
            correct();
        }
    }
    inline void correct() {
        up = vec3::normalize(vec3::cross(viewDir, vec3::cross(up, viewDir)));
    }
};