overte-HifiExperiments/libraries/octree/src/AABox.h

//
//  AABox.h
//  libraries/octree/src
//
//  Created by Brad Hefta-Gaub on 04/11/13.
//  Copyright 2013 High Fidelity, Inc.
//
//  Originally from lighthouse3d. Modified to utilize glm::vec3 and clean up to our coding standards
//  Simple axis aligned box class.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#ifndef hifi_AABox_h
#define hifi_AABox_h

#include <glm/glm.hpp>

enum BoxFace {
    MIN_X_FACE,
    MAX_X_FACE,
    MIN_Y_FACE,
    MAX_Y_FACE,
    MIN_Z_FACE,
    MAX_Z_FACE,
    UNKNOWN_FACE
};

enum BoxVertex {
    BOTTOM_LEFT_NEAR   = 0,
    BOTTOM_RIGHT_NEAR  = 1,
    TOP_RIGHT_NEAR     = 2,
    TOP_LEFT_NEAR      = 3,
    BOTTOM_LEFT_FAR    = 4,
    BOTTOM_RIGHT_FAR   = 5,
    TOP_RIGHT_FAR      = 6,
    TOP_LEFT_FAR       = 7
};

const int FACE_COUNT = 6;

class AABox {

public:
    AABox(const glm::vec3& corner, float size);
    AABox();
    ~AABox() {};

    void setBox(const glm::vec3& corner, float scale);

    // for use in frustum computations
    glm::vec3 getVertexP(const glm::vec3& normal) const;
    glm::vec3 getVertexN(const glm::vec3& normal) const;

    void scale(float scale);

    const glm::vec3& getCorner() const     { return _corner; };
    float getScale() const { return _scale; }

    glm::vec3 calcCenter() const;
    glm::vec3 calcTopFarLeft() const;

    glm::vec3 getVertex(BoxVertex vertex) const;

    bool contains(const glm::vec3& point) const;
    bool contains(const AABox& otherBox) const;
    bool touches(const AABox& otherBox) const;
    bool expandedContains(const glm::vec3& point, float expansion) const;
    bool expandedIntersectsSegment(const glm::vec3& start, const glm::vec3& end, float expansion) const;
    bool findRayIntersection(const glm::vec3& origin, const glm::vec3& direction, float& distance, BoxFace& face) const;
    bool findSpherePenetration(const glm::vec3& center, float radius, glm::vec3& penetration) const;
    bool findCapsulePenetration(const glm::vec3& start, const glm::vec3& end, float radius, glm::vec3& penetration) const;

private:
    glm::vec3 getClosestPointOnFace(const glm::vec3& point, BoxFace face) const;
    glm::vec3 getClosestPointOnFace(const glm::vec4& origin, const glm::vec4& direction, BoxFace face) const;
    glm::vec4 getPlane(BoxFace face) const;

    static BoxFace getOppositeFace(BoxFace face);

    glm::vec3 _corner;
    float _scale;
};

#endif // hifi_AABox_h