# driver.cpp

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    00001 /* $Id: driver.cpp 18809 2010-01-15 16:41:15Z rubidium $ */
    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
    00025 SoundDriver *_sound_driver;
    00026 char *_ini_sounddriver;
    00027
    00028 MusicDriver *_music_driver;
    00029 char *_ini_musicdriver;
    00030
    00031 char *_ini_blitter;
    00032
    00033 const char *GetDriverParam(const char * const *parm, const char *name)
    00034 {
    00035   size_t len;
    00036
    00037   if (parm == NULL) return NULL;
    00038
    00039   len = strlen(name);
    00040   for (; *parm != NULL; parm++) {
    00041     const char *p = *parm;
    00042
    00043     if (strncmp(p, name, len) == 0) {
    00044       if (p[len] == '=')  return p + len + 1;
    00045       if (p[len] == '\0') return p + len;
    00046     }
    00047   }
    00048   return NULL;
    00049 }
    00050
    00051 bool GetDriverParamBool(const char * const *parm, const char *name)
    00052 {
    00053   return GetDriverParam(parm, name) != NULL;
    00054 }
    00055
    00056 int GetDriverParamInt(const char * const *parm, const char *name, int def)
    00057 {
    00058   const char *p = GetDriverParam(parm, name);
    00059   return p != NULL ? atoi(p) : def;
    00060 }
    00061
    00068 Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
    00069 {
    00070   if (GetDrivers().size() == 0) return NULL;
    00071
    00072   if (StrEmpty(name)) {
    00073     /* Probe for this driver, but do not fall back to dedicated/null! */
    00074     for (int priority = 10; priority > 0; priority--) {
    00075       Drivers::iterator it = GetDrivers().begin();
    00076       for (; it != GetDrivers().end(); ++it) {
    00077         DriverFactoryBase *d = (*it).second;
    00078
    00079         /* Check driver type */
    00080         if (d->type != type) continue;
    00081         if (d->priority != priority) continue;
    00082
    00083         Driver *newd = d->CreateInstance();
    00084         const char *err = newd->Start(NULL);
    00085         if (err == NULL) {
    00086           DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
    00087           delete *GetActiveDriver(type);
    00088           *GetActiveDriver(type) = newd;
    00089           return newd;
    00090         }
    00091
    00092         DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
    00093         delete newd;
    00094       }
    00095     }
    00096     usererror("Couldn't find any suitable %s driver", GetDriverTypeName(type));
    00097   } else {
    00098     char *parm;
    00099     char buffer[256];
    00100     const char *parms[32];
    00101
    00102     /* Extract the driver name and put parameter list in parm */
    00103     strecpy(buffer, name, lastof(buffer));
    00104     parm = strchr(buffer, ':');
    00105     parms[0] = NULL;
    00106     if (parm != NULL) {
    00107       uint np = 0;
    00108       /* Tokenize the parm. */
    00109       do {
    00110         *parm++ = '\0';
    00111         if (np < lengthof(parms) - 1) parms[np++] = parm;
    00112         while (*parm != '\0' && *parm != ',') parm++;
    00113       } while (*parm == ',');
    00114       parms[np] = NULL;
    00115     }
    00116
    00117     /* Find this driver */
    00118     Drivers::iterator it = GetDrivers().begin();
    00119     for (; it != GetDrivers().end(); ++it) {
    00120       DriverFactoryBase *d = (*it).second;
    00121
    00122       /* Check driver type */
    00123       if (d->type != type) continue;
    00124
    00125       /* Check driver name */
    00126       if (strcasecmp(buffer, d->name) != 0) continue;
    00127
    00128       /* Found our driver, let's try it */
    00129       Driver *newd = d->CreateInstance();
    00130
    00131       const char *err = newd->Start(parms);
    00132       if (err != NULL) {
    00133         delete newd;
    00134         usererror("Unable to load driver '%s'. The error was: %s", d->name, err);
    00135       }
    00136
    00137       DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
    00138       delete *GetActiveDriver(type);
    00139       *GetActiveDriver(type) = newd;
    00140       return newd;
    00141     }
    00142     usererror("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
    00143   }
    00144 }
    00145
    00153 void DriverFactoryBase::RegisterDriver(const char *name, Driver::Type type, int priority)
    00154 {
    00155   /* Don't register nameless Drivers */
    00156   if (name == NULL) return;
    00157
    00158   this->name = strdup(name);
    00159   this->type = type;
    00160   this->priority = priority;
    00161
    00162   /* Prefix the name with driver type to make it unique */
    00163   char buf[32];
    00164   strecpy(buf, GetDriverTypeName(type), lastof(buf));
    00165   strecpy(buf + 5, name, lastof(buf));
    00166
    00167   const char *longname = strdup(buf);
    00168
    00169   std::pair<Drivers::iterator, bool> P = GetDrivers().insert(Drivers::value_type(longname, this));
    00170   assert(P.second);
    00171 }
    00172
    00176 char *DriverFactoryBase::GetDriversInfo(char *p, const char *last)
    00177 {
    00178   for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
    00179     p += seprintf(p, last, "List of %s drivers:\n", GetDriverTypeName(type));
    00180
    00181     for (int priority = 10; priority >= 0; priority--) {
    00182       Drivers::iterator it = GetDrivers().begin();
    00183       for (; it != GetDrivers().end(); it++) {
    00184         DriverFactoryBase *d = (*it).second;
    00185         if (d->type != type) continue;
    00186         if (d->priority != priority) continue;
    00187         p += seprintf(p, last, "%18s: %s\n", d->name, d->GetDescription());
    00188       }
    00189     }
    00190
    00191     p += seprintf(p, last, "\n");
    00192   }
    00193
    00194   return p;
    00195 }
    00196
    00199 DriverFactoryBase::~DriverFactoryBase()
    00200 {
    00201   if (this->name == NULL) return;
    00202
    00203   /* Prefix the name with driver type to make it unique */
    00204   char buf[32];
    00205   strecpy(buf, GetDriverTypeName(type), lastof(buf));
    00206   strecpy(buf + 5, this->name, lastof(buf));
    00207
    00208   Drivers::iterator it = GetDrivers().find(buf);
    00209   assert(it != GetDrivers().end());
    00210
    00211   const char *longname = (*it).first;
    00212
    00213   GetDrivers().erase(it);
    00214   free((void *)longname);
    00215
    00216   if (GetDrivers().empty()) delete &GetDrivers();
    00217   free((void *)this->name);
    00218 }