Frustum.h

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#pragma once
 
#include <array>
 
#include <tdme/tdme.h>
#include <tdme/engine/fwd-tdme.h>
#include <tdme/engine/primitives/fwd-tdme.h>
#include <tdme/engine/primitives/BoundingBox.h>
#include <tdme/engine/primitives/Plane.h>
#include <tdme/engine/primitives/Sphere.h>
#include <tdme/engine/subsystems/renderer/fwd-tdme.h>
#include <tdme/math/fwd-tdme.h>
#include <tdme/math/Matrix4x4.h>
 
using std::array;
 
using tdme::engine::primitives::BoundingBox;
using tdme::engine::primitives::Plane;
using tdme::engine::primitives::Sphere;
using tdme::engine::subsystems::renderer::Renderer;
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
 
/**
 * Frustum class
 * @author Mark Morley, Andreas Drewke
 * @version $Id$
 */
class tdme::engine::Frustum final
{
private:
    Renderer* renderer { nullptr };
 
    Matrix4x4 projectionMatrixTransposed;
    Matrix4x4 modelViewMatrixTransposed;
    Matrix4x4 frustumMatrix;
 
    array<Plane, 6> planes;
 
public:
    // right, left, bottom, top, far, near
    static constexpr int32_t PLANE_RIGHT { 0 };
    static constexpr int32_t PLANE_LEFT { 1 };
    static constexpr int32_t PLANE_BOTTOM { 2 };
    static constexpr int32_t PLANE_TOP { 3 };
    static constexpr int32_t PLANE_FAR { 4 };
    static constexpr int32_t PLANE_NEAR { 5 };
 
    /**
     * Public constructor
     */
    Frustum(Renderer* renderer);
 
    /**
     * @return planes
     */
    inline const array<Plane, 6>& getPlanes() {
        return planes;
    }
 
    /**
     * Setups frustum, should be called if frustum did change
     */
    void update();
 
    /**
     * Checks if given vertex is in frustum
     * @param vector vector
     * @return visibility
     */
    inline bool isVisible(const Vector3& vertex) {
        for (auto& p: planes) {
            if (Vector3::computeDotProduct(p.getNormal(), vertex) + p.getDistance() < 0.0f) {
                return false;
            }
        }
        return true;
    }
 
    /**
     * Checks if sphere is in frustum
     * @param s s
     * @return visibility
     */
    inline bool isVisible(Sphere* s) {
        auto& center = s->getCenter();
        auto radius = s->getRadius();
        for (auto& p: planes) {
            if (Vector3::computeDotProduct(p.getNormal(), center) + p.getDistance() < -radius) {
                return false;
            }
        }
        return true;
    }
 
    /**
     * Checks if bounding box is in frustum
     * @param b s
     * @return visibility
     */
    inline bool isVisible(BoundingBox* b) {
        auto minX = b->getMin()[0];
        auto minY = b->getMin()[1];
        auto minZ = b->getMin()[2];
        auto maxX = b->getMax()[0];
        auto maxY = b->getMax()[1];
        auto maxZ = b->getMax()[2];
        Vector3 point;
        for (auto& p :planes) {
            auto& normal = p.getNormal();
            auto distance = p.getDistance();
            if (Vector3::computeDotProduct(normal, point.set(minX, minY, minZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(maxX, minY, minZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(minX, maxY, minZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(maxX, maxY, minZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(minX, minY, maxZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(maxX, minY, maxZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(minX, maxY, maxZ)) + distance > 0.0f) continue;
            if (Vector3::computeDotProduct(normal, point.set(maxX, maxY, maxZ)) + distance > 0.0f) continue;
            return false;
        }
        return true;
    }
 
};