driver.h

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD 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, version 2.
00006  * OpenTTD 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.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef DRIVER_H
00013 #define DRIVER_H
00014 
00015 #include "core/enum_type.hpp"
00016 #include "core/string_compare_type.hpp"
00017 #include <map>
00018 
00019 const char *GetDriverParam(const char * const *parm, const char *name);
00020 bool GetDriverParamBool(const char * const *parm, const char *name);
00021 int GetDriverParamInt(const char * const *parm, const char *name, int def);
00022 
00024 class Driver {
00025 public:
00031   virtual const char *Start(const char * const *parm) = 0;
00032 
00036   virtual void Stop() = 0;
00037 
00038   virtual ~Driver() { }
00039 
00041   enum Type {
00042     DT_BEGIN = 0, 
00043     DT_MUSIC = 0, 
00044     DT_SOUND,     
00045     DT_VIDEO,     
00046     DT_END,       
00047   };
00048 
00053   virtual const char *GetName() const = 0;
00054 };
00055 
00056 DECLARE_POSTFIX_INCREMENT(Driver::Type)
00057 
00058 
00059 
00060 class DriverFactoryBase {
00061 private:
00062   Driver::Type type; 
00063   const char *name;  
00064   int priority;      
00065 
00066   typedef std::map<const char *, DriverFactoryBase *, StringCompare> Drivers; 
00067 
00071   static Drivers &GetDrivers()
00072   {
00073     static Drivers &s_drivers = *new Drivers();
00074     return s_drivers;
00075   }
00076 
00082   static Driver **GetActiveDriver(Driver::Type type)
00083   {
00084     static Driver *s_driver[3] = { NULL, NULL, NULL };
00085     return &s_driver[type];
00086   }
00087 
00093   static const char *GetDriverTypeName(Driver::Type type)
00094   {
00095     static const char * const driver_type_name[] = { "music", "sound", "video" };
00096     return driver_type_name[type];
00097   }
00098 
00099 protected:
00100   void RegisterDriver(const char *name, Driver::Type type, int priority);
00101 
00102 public:
00103   DriverFactoryBase() :
00104     name(NULL)
00105   {}
00106 
00107   virtual ~DriverFactoryBase();
00108 
00112   static void ShutdownDrivers()
00113   {
00114     for (Driver::Type dt = Driver::DT_BEGIN; dt < Driver::DT_END; dt++) {
00115       Driver *driver = *GetActiveDriver(dt);
00116       if (driver != NULL) driver->Stop();
00117     }
00118   }
00119 
00120   static Driver *SelectDriver(const char *name, Driver::Type type);
00121   static char *GetDriversInfo(char *p, const char *last);
00122 
00127   virtual const char *GetDescription() = 0;
00128 
00133   virtual Driver *CreateInstance() = 0;
00134 };
00135 
00136 #endif /* DRIVER_H */

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