RedCore/cocos2d/cocos/physics3d/CCPhysics3DWorld.h

/****************************************************************************
 Copyright (c) 2015-2017 Chukong Technologies Inc.
 
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#ifndef __PHYSICS_3D_WORLD_H__
#define __PHYSICS_3D_WORLD_H__

#include "math/CCMath.h"
#include "base/CCRef.h"
#include "base/ccConfig.h"

#if CC_USE_3D_PHYSICS

#if (CC_ENABLE_BULLET_INTEGRATION)

class btDynamicsWorld;
class btDefaultCollisionConfiguration;
class btCollisionDispatcher;
class btDbvtBroadphase;
class btSequentialImpulseConstraintSolver;
class btGhostPairCallback;
class btRigidBody;
class btCollisionObject;

NS_CC_BEGIN
/**
 * @addtogroup _3d
 * @{
 */

class Physics3DObject;
class Physics3DConstraint;
class Physics3DDebugDrawer;
class Physics3DComponent;
class Physics3DShape;
class Renderer;

/**
 * @brief The description of Physics3DWorld.
 */
struct CC_DLL Physics3DWorldDes
{
    bool           isDebugDrawEnabled; //using physics debug draw?, false by default
    cocos2d::Vec3  gravity;//gravity, (0, -9.8, 0)
    Physics3DWorldDes()
    {
        isDebugDrawEnabled = false;
        gravity = cocos2d::Vec3(0.f, -9.8f, 0.f);
    }
};

/**
 * @brief The physics information container, include Physics3DObjects, Physics3DConstraints, collision information and so on.
 */
class CC_DLL Physics3DWorld : public Ref
{
    friend class Physics3DComponent;
public:
    
    struct HitResult
    {
        cocos2d::Vec3 hitPosition;
        cocos2d::Vec3 hitNormal;
        Physics3DObject* hitObj;
    };
    
    /**
     * Creates a Physics3DWorld with Physics3DWorldDes. 
     *
     * @return An autoreleased Physics3DWorld object.
     */
    static Physics3DWorld* create(Physics3DWorldDes* info);
    
    /** set gravity for the physics world */
    void setGravity(const Vec3& gravity);
    
    /** get current gravity */
    Vec3 getGravity() const;
    
    /** Add a Physics3DObject. */
    void addPhysics3DObject(Physics3DObject* physicsObj);
    
    /** Remove a Physics3DObject. */
    void removePhysics3DObject(Physics3DObject* physicsObj);
    
    /** Remove all Physics3DObjects. */
    void removeAllPhysics3DObjects();
    
    /** Add a Physics3DConstraint. */
    void addPhysics3DConstraint(Physics3DConstraint* constraint, bool disableCollisionsBetweenLinkedObjs = true);
    
    /** Remove a Physics3DConstraint. */
    void removePhysics3DConstraint(Physics3DConstraint* constraint);
    
    /** Remove all Physics3DConstraint. */
    void removeAllPhysics3DConstraints();
    
    /** Simulate one frame. */
    void stepSimulate(float dt);
    
    /** Enable or disable debug drawing. */
    void setDebugDrawEnable(bool enableDebugDraw);
    
    /** Check debug drawing is enabled. */
    bool isDebugDrawEnabled() const;
    
    /** Internal method, the updater of debug drawing, need called each frame. */
    void debugDraw(cocos2d::Renderer* renderer);
    
    /** Get the list of Physics3DObjects. */
    const std::vector<Physics3DObject*>& getPhysicsObjects() const { return _objects; }
    
    /**
     * Ray cast method
     * @param startPos The start position of ray.
     * @param endPos The end position of ray.
     * @param result the result of ray cast.
     */
    bool rayCast(const cocos2d::Vec3& startPos, const cocos2d::Vec3& endPos, HitResult* result);
    
    /** Performs a swept shape cast on all objects in the Physics3DWorld. */
    bool sweepShape(Physics3DShape* shape, const cocos2d::Mat4& startTransform, const cocos2d::Mat4& endTransform, HitResult* result);
    
CC_CONSTRUCTOR_ACCESS:
    
    Physics3DWorld();
    virtual ~Physics3DWorld();
    
    bool init(Physics3DWorldDes* info);
    
    Physics3DObject* getPhysicsObject(const btCollisionObject* btObj);

    void collisionChecking();
    bool needCollisionChecking();
    void setGhostPairCallback();
    
protected:
    std::vector<Physics3DObject*>      _objects;
    std::vector<Physics3DComponent*>   _physicsComponents; //physics3d components
    bool _needCollisionChecking;
    bool _collisionCheckingFlag;
    bool _needGhostPairCallbackChecking;
    
#if (CC_ENABLE_BULLET_INTEGRATION)
    btDynamicsWorld* _btPhyiscsWorld;
    btDefaultCollisionConfiguration* _collisionConfiguration;
    btCollisionDispatcher* _dispatcher;
    btDbvtBroadphase* _broadphase;
    btSequentialImpulseConstraintSolver* _solver;
    btGhostPairCallback *_ghostCallback;
    Physics3DDebugDrawer*                _debugDrawer;
#endif // CC_ENABLE_BULLET_INTEGRATION
};

// end of 3d group
/// @}
NS_CC_END

#endif

#endif //CC_USE_3D_PHYSICS

#endif // __PHYSICS_3D_WORLD_H__