Frustum.h

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#pragma once
 
#include <array>
#include <cmath>
#include "../core/MathUtils.h"
#include "../core/Matrix.h"
#include "../physics/AABB.h"
 
struct Plane {
    float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
 
    Plane() = default;
    Plane(float _a, float _b, float _c, float _d) : a(_a), b(_b), c(_c), d(_d) {}
 
    void Normalize() {
        float length = std::sqrt(a * a + b * b + c * c);
        if (length > 0.0f) {
            float invLength = 1.0f / length;
            a *= invLength;
            b *= invLength;
            c *= invLength;
            d *= invLength;
        }
    }
 
    float GetSignedDistanceToPlane(const Core::Vec3& point) const {
        return a * point.x + b * point.y + c * point.z + d;
    }
};
 
class Frustum {
public:
    Frustum() = default;
 
    void Update(const Core::Mat4& viewProjMatrix);
 
    bool IsBoxInVisibleFrustum(const AABB& box) const;
 
private:
    std::array<Plane, 6> m_arrPlanes;
};