driver.cpp

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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 #include "stdafx.h"
00013 #include "debug.h"
00014 #include "sound/sound_driver.hpp"
00015 #include "music/music_driver.hpp"
00016 #include "video/video_driver.hpp"
00017 #include "string_func.h"
00018 
00019 VideoDriver *_video_driver;
00020 char *_ini_videodriver;
00021 int _num_resolutions;
00022 Dimension _resolutions[32];
00023 Dimension _cur_resolution;
00024 bool _rightclick_emulate;
00025 
00026 SoundDriver *_sound_driver;
00027 char *_ini_sounddriver;
00028 
00029 MusicDriver *_music_driver;
00030 char *_ini_musicdriver;
00031 
00032 char *_ini_blitter;
00033 
00034 const char *GetDriverParam(const char * const *parm, const char *name)
00035 {
00036   size_t len;
00037 
00038   if (parm == NULL) return NULL;
00039 
00040   len = strlen(name);
00041   for (; *parm != NULL; parm++) {
00042     const char *p = *parm;
00043 
00044     if (strncmp(p, name, len) == 0) {
00045       if (p[len] == '=')  return p + len + 1;
00046       if (p[len] == '\0') return p + len;
00047     }
00048   }
00049   return NULL;
00050 }
00051 
00052 bool GetDriverParamBool(const char * const *parm, const char *name)
00053 {
00054   return GetDriverParam(parm, name) != NULL;
00055 }
00056 
00057 int GetDriverParamInt(const char * const *parm, const char *name, int def)
00058 {
00059   const char *p = GetDriverParam(parm, name);
00060   return p != NULL ? atoi(p) : def;
00061 }
00062 
00069 Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
00070 {
00071   if (GetDrivers().size() == 0) return NULL;
00072 
00073   if (StrEmpty(name)) {
00074     /* Probe for this driver, but do not fall back to dedicated/null! */
00075     for (int priority = 10; priority > 0; priority--) {
00076       Drivers::iterator it = GetDrivers().begin();
00077       for (; it != GetDrivers().end(); ++it) {
00078         DriverFactoryBase *d = (*it).second;
00079 
00080         /* Check driver type */
00081         if (d->type != type) continue;
00082         if (d->priority != priority) continue;
00083 
00084         Driver *newd = d->CreateInstance();
00085         const char *err = newd->Start(NULL);
00086         if (err == NULL) {
00087           DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
00088           delete *GetActiveDriver(type);
00089           *GetActiveDriver(type) = newd;
00090           return newd;
00091         }
00092 
00093         DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
00094         delete newd;
00095       }
00096     }
00097     usererror("Couldn't find any suitable %s driver", GetDriverTypeName(type));
00098   } else {
00099     char *parm;
00100     char buffer[256];
00101     const char *parms[32];
00102 
00103     /* Extract the driver name and put parameter list in parm */
00104     strecpy(buffer, name, lastof(buffer));
00105     parm = strchr(buffer, ':');
00106     parms[0] = NULL;
00107     if (parm != NULL) {
00108       uint np = 0;
00109       /* Tokenize the parm. */
00110       do {
00111         *parm++ = '\0';
00112         if (np < lengthof(parms) - 1) parms[np++] = parm;
00113         while (*parm != '\0' && *parm != ',') parm++;
00114       } while (*parm == ',');
00115       parms[np] = NULL;
00116     }
00117 
00118     /* Find this driver */
00119     Drivers::iterator it = GetDrivers().begin();
00120     for (; it != GetDrivers().end(); ++it) {
00121       DriverFactoryBase *d = (*it).second;
00122 
00123       /* Check driver type */
00124       if (d->type != type) continue;
00125 
00126       /* Check driver name */
00127       if (strcasecmp(buffer, d->name) != 0) continue;
00128 
00129       /* Found our driver, let's try it */
00130       Driver *newd = d->CreateInstance();
00131 
00132       const char *err = newd->Start(parms);
00133       if (err != NULL) {
00134         delete newd;
00135         usererror("Unable to load driver '%s'. The error was: %s", d->name, err);
00136       }
00137 
00138       DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
00139       delete *GetActiveDriver(type);
00140       *GetActiveDriver(type) = newd;
00141       return newd;
00142     }
00143     usererror("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
00144   }
00145 }
00146 
00154 void DriverFactoryBase::RegisterDriver(const char *name, Driver::Type type, int priority)
00155 {
00156   /* Don't register nameless Drivers */
00157   if (name == NULL) return;
00158 
00159   this->name = strdup(name);
00160   this->type = type;
00161   this->priority = priority;
00162 
00163   /* Prefix the name with driver type to make it unique */
00164   char buf[32];
00165   strecpy(buf, GetDriverTypeName(type), lastof(buf));
00166   strecpy(buf + 5, name, lastof(buf));
00167 
00168   const char *longname = strdup(buf);
00169 
00170   std::pair<Drivers::iterator, bool> P = GetDrivers().insert(Drivers::value_type(longname, this));
00171   assert(P.second);
00172 }
00173 
00177 char *DriverFactoryBase::GetDriversInfo(char *p, const char *last)
00178 {
00179   for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
00180     p += seprintf(p, last, "List of %s drivers:\n", GetDriverTypeName(type));
00181 
00182     for (int priority = 10; priority >= 0; priority--) {
00183       Drivers::iterator it = GetDrivers().begin();
00184       for (; it != GetDrivers().end(); it++) {
00185         DriverFactoryBase *d = (*it).second;
00186         if (d->type != type) continue;
00187         if (d->priority != priority) continue;
00188         p += seprintf(p, last, "%18s: %s\n", d->name, d->GetDescription());
00189       }
00190     }
00191 
00192     p += seprintf(p, last, "\n");
00193   }
00194 
00195   return p;
00196 }
00197 
00201 DriverFactoryBase::~DriverFactoryBase()
00202 {
00203   if (this->name == NULL) return;
00204 
00205   /* Prefix the name with driver type to make it unique */
00206   char buf[32];
00207   strecpy(buf, GetDriverTypeName(type), lastof(buf));
00208   strecpy(buf + 5, this->name, lastof(buf));
00209 
00210   Drivers::iterator it = GetDrivers().find(buf);
00211   assert(it != GetDrivers().end());
00212 
00213   const char *longname = (*it).first;
00214 
00215   GetDrivers().erase(it);
00216   free((void *)longname);
00217 
00218   if (GetDrivers().empty()) delete &GetDrivers();
00219   free((void *)this->name);
00220 }

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