axmol/core/physics3d/Physics3DWorld.h

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 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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#ifndef __PHYSICS_3D_WORLD_H__
#define __PHYSICS_3D_WORLD_H__

#include "math/Math.h"
#include "base/Ref.h"
#include "base/Config.h"

#if AX_USE_3D_PHYSICS

#    if (AX_ENABLE_BULLET_INTEGRATION)

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

NS_AX_BEGIN
/**
 * @addtogroup _3d
 * @{
 */

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

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

/**
 * @brief The physics information container, include Physics3DObjects, Physics3DConstraints, collision information and
 * so on.
 */
class AX_DLL Physics3DWorld : public Ref
{
    friend class Physics3DComponent;

public:
    struct HitResult
    {
        ax::Vec3 hitPosition;
        ax::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(ax::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 ax::Vec3& startPos, const ax::Vec3& endPos, HitResult* result);

    /** Performs a swept shape cast on all objects in the Physics3DWorld. */
    bool sweepShape(Physics3DShape* shape,
                    const ax::Mat4& startTransform,
                    const ax::Mat4& endTransform,
                    HitResult* result);

    Physics3DWorld();
    virtual ~Physics3DWorld();

    bool init(Physics3DWorldDes* info);

    Physics3DObject* getPhysicsObject(const btCollisionObject* btObj);

    void collisionChecking();
    bool needCollisionChecking();
    void setGhostPairCallback();

protected:
    void removePhysics3DConstraintFromBullet(Physics3DConstraint* constraint);

    std::vector<Physics3DObject*> _objects;
    std::vector<Physics3DConstraint*> _constraints;
    std::vector<Physics3DComponent*> _physicsComponents;  // physics3d components
    bool _needCollisionChecking;
    bool _collisionCheckingFlag;
    bool _needGhostPairCallbackChecking;

#        if (AX_ENABLE_BULLET_INTEGRATION)
    btDynamicsWorld* _btPhyiscsWorld;
    btDefaultCollisionConfiguration* _collisionConfiguration;
    btCollisionDispatcher* _dispatcher;
    btDbvtBroadphase* _broadphase;
    btSequentialImpulseConstraintSolver* _solver;
    btGhostPairCallback* _ghostCallback;
    Physics3DDebugDrawer* _debugDrawer;
#        endif  // AX_ENABLE_BULLET_INTEGRATION
};

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

#    endif

#endif  // AX_USE_3D_PHYSICS

#endif  // __PHYSICS_3D_WORLD_H__