//  $Id: physics.hpp 839 2006-10-24 00:01:56Z hiker $
//
//  SuperTuxKart - a fun racing game with go-kart
//  Copyright (C) 2006 Joerg Henrichs
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#ifndef HEADER_PHYSICS_H
#define HEADER_PHYSICS_H

#include "kart.hpp"
#include <plib/sg.h>

#ifdef BULLET
#include "btBulletDynamicsCommon.h"
#include "bullet/Demos/OpenGL/GLDebugDrawer.h"
class Physics
{
protected:
    btDynamicsWorld                 *m_dynamics_world;
    Kart                            *m_kart;
    GLDebugDrawer                   *m_debug_drawer;
    btCollisionDispatcher           *m_dispatcher;
    btBroadphaseInterface           *m_axis_sweep;
    btDefaultCollisionConfiguration *m_collision_conf;
    btConstraintSolver              *m_constraint_solver;

    void convertTrack(ssgEntity *track, sgMat4 m,  btTriangleMesh* track_mesh);
public:
          Physics         (float gravity);
         ~Physics         ();
    void  addKart         (const Kart *k, btRaycastVehicle *v);
    void  addBody         (btRigidBody* b) {m_dynamics_world->addRigidBody(b);}
    void  removeKart      (const Kart *k);
    void  removeBody      (btRigidBody* b) {m_dynamics_world->removeRigidBody(b);}
    void  update          (float dt);
    void  handleCollisions();
    void  draw            ();
    void  setTrack        (ssgEntity *track);
    btDynamicsWorld*
          getPhysicsWorld () const {return m_dynamics_world;}
    void  debugDraw       (float m[16], btCollisionShape *s, const btVector3 color);
    static float NOHIT;
    float getHAT          (btVector3 pos);
    bool  getTerrainNormal(btVector3 pos, btVector3* normal);
};
// For non-bullet version: empty object
#else
class Physics
{
public:
    Physics(float gravity) {};
    ~Physics() {};
    void update(float dt) {};
    void setTrack(ssgEntity *track) {};
    void draw     () {};
};

#endif

#endif
/* EOF */