Differentials.h

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/*
    This source file is part of Rigs of Rods
    Copyright 2005-2012 Pierre-Michel Ricordel
    Copyright 2007-2012 Thomas Fischer
 
    For more information, see http://www.rigsofrods.org/
 
    Rigs of Rods is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 3, as
    published by the Free Software Foundation.
 
    Rigs of Rods 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 Rigs of Rods. If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <vector>
#include <OgreUTFString.h>
 
namespace RoR {
 
 
 
struct DifferentialData
{
    float speed[2];
    float delta_rotation; // sign is first relative to the second
    float out_torque[2];
    float in_torque;
    float dt;
};
 
class TransferCase
{
public:
    TransferCase(int a1, int a2, bool has_2wd, bool has_2wd_lo, std::vector<float> grs):
        tr_ax_1(a1), tr_ax_2(a2), tr_2wd(has_2wd), tr_2wd_lo(has_2wd_lo), tr_4wd_mode(false), tr_gear_ratios(grs) {};
 
    int   tr_ax_1;                      
    int   tr_ax_2;                      
    bool  tr_2wd;                       
    bool  tr_2wd_lo;                    
    bool  tr_4wd_mode;                  
    std::vector<float> tr_gear_ratios;  
};
 
enum DiffType
{
    SPLIT_DIFF = 0,
    OPEN_DIFF,
    VISCOUS_DIFF,
    LOCKED_DIFF,
    INVALID_DIFF
};
 
class Differential
{
public:
    Differential(): di_idx_1(0), di_idx_2(0), di_delta_rotation(0.0f) {};
 
    int       di_idx_1;          
    int       di_idx_2;          
    float     di_delta_rotation; 
 
    void             AddDifferentialType(DiffType diff) { m_available_diffs.push_back(diff); }
    void             ToggleDifferentialMode();
    void             CalcAxleTorque(DifferentialData& diff_data);
    Ogre::UTFString  GetDifferentialTypeName();
    DiffType         GetActiveDiffType() const { return m_available_diffs[0]; }
    int              GetNumDiffTypes() { return static_cast<int>(m_available_diffs.size()); }
    
    static void      CalcSeparateDiff(DifferentialData& diff_data);  
    static void      CalcOpenDiff(DifferentialData& diff_data );     
    static void      CalcViscousDiff(DifferentialData& diff_data );  
    static void      CalcLockedDiff(DifferentialData& diff_data );   
 
private:
    std::vector<DiffType> m_available_diffs;
};
 
 
} // namespace RoR