ViewFrustum.h

#pragma once
#include "glm.hpp"
#include "BoundingBox.h"
#include <iostream>


class ViewFrustum{
public:
    ViewFrustum();
    ~ViewFrustum();
    void defineCamera(float& nearDist, float& farDist, float& fieldOfView, float& ratio);
    void calcFrustum(glm::mat4& modelViewMat);
    bool ViewFrustum::isCullable(BoundingBox* b);

    class ViewFrustumPlane{
    public:
        ViewFrustumPlane();
        ~ViewFrustumPlane();
        void init(glm::vec3 a, glm::vec3 b, glm::vec3 c);
        bool isOutside(glm::vec3 point);
    private:
        glm::vec3 normalvector;
        float d; // ax+by+cz+d = 0
    };

private:
    float fov;
    float rat;
    glm::vec3 camPos;
    glm::vec3 camViewRayNormalized;
    float near_Dist;
    float far_Dist;
    float near_Height;
    float near_Width;
    float far_Height;
    float far_Width;
    glm::vec3 up;
    glm::vec3 right;

    //0:near, 1:right, 2:far, 3:left, 4:top, 5:bottom 
    ViewFrustumPlane clipping_planes[6];

    void ViewFrustum::createPlanes();


    
};