# driver.cpp

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    00001 /* $Id: driver.cpp 17690 2009-10-04 14:49:39Z smatz $ */
    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
    00018 VideoDriver *_video_driver;
    00019 char *_ini_videodriver;
    00020 int _num_resolutions;
    00021 Dimension _resolutions[32];
    00022 Dimension _cur_resolution;
    00023
    00024 SoundDriver *_sound_driver;
    00025 char *_ini_sounddriver;
    00026
    00027 MusicDriver *_music_driver;
    00028 char *_ini_musicdriver;
    00029
    00030 char *_ini_blitter;
    00031
    00032 const char *GetDriverParam(const char * const *parm, const char *name)
    00033 {
    00034   size_t len;
    00035
    00036   if (parm == NULL) return NULL;
    00037
    00038   len = strlen(name);
    00039   for (; *parm != NULL; parm++) {
    00040     const char *p = *parm;
    00041
    00042     if (strncmp(p, name, len) == 0) {
    00043       if (p[len] == '=')  return p + len + 1;
    00044       if (p[len] == '\0') return p + len;
    00045     }
    00046   }
    00047   return NULL;
    00048 }
    00049
    00050 bool GetDriverParamBool(const char * const *parm, const char *name)
    00051 {
    00052   return GetDriverParam(parm, name) != NULL;
    00053 }
    00054
    00055 int GetDriverParamInt(const char * const *parm, const char *name, int def)
    00056 {
    00057   const char *p = GetDriverParam(parm, name);
    00058   return p != NULL ? atoi(p) : def;
    00059 }
    00060
    00067 Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
    00068 {
    00069   if (GetDrivers().size() == 0) return NULL;
    00070
    00071   if (StrEmpty(name)) {
    00072     /* Probe for this driver, but do not fall back to dedicated/null! */
    00073     for (int priority = 10; priority > 0; priority--) {
    00074       Drivers::iterator it = GetDrivers().begin();
    00075       for (; it != GetDrivers().end(); ++it) {
    00076         DriverFactoryBase *d = (*it).second;
    00077
    00078         /* Check driver type */
    00079         if (d->type != type) continue;
    00080         if (d->priority != priority) continue;
    00081
    00082         Driver *newd = d->CreateInstance();
    00083         const char *err = newd->Start(NULL);
    00084         if (err == NULL) {
    00085           DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
    00086           delete *GetActiveDriver(type);
    00087           *GetActiveDriver(type) = newd;
    00088           return newd;
    00089         }
    00090
    00091         DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
    00092         delete newd;
    00093       }
    00094     }
    00095     usererror("Couldn't find any suitable %s driver", GetDriverTypeName(type));
    00096   } else {
    00097     char *parm;
    00098     char buffer[256];
    00099     const char *parms[32];
    00100
    00101     /* Extract the driver name and put parameter list in parm */
    00102     strecpy(buffer, name, lastof(buffer));
    00103     parm = strchr(buffer, ':');
    00104     parms[0] = NULL;
    00105     if (parm != NULL) {
    00106       uint np = 0;
    00107       /* Tokenize the parm. */
    00108       do {
    00109         *parm++ = '\0';
    00110         if (np < lengthof(parms) - 1) parms[np++] = parm;
    00111         while (*parm != '\0' && *parm != ',') parm++;
    00112       } while (*parm == ',');
    00113       parms[np] = NULL;
    00114     }
    00115
    00116     /* Find this driver */
    00117     Drivers::iterator it = GetDrivers().begin();
    00118     for (; it != GetDrivers().end(); ++it) {
    00119       DriverFactoryBase *d = (*it).second;
    00120
    00121       /* Check driver type */
    00122       if (d->type != type) continue;
    00123
    00124       /* Check driver name */
    00125       if (strcasecmp(buffer, d->name) != 0) continue;
    00126
    00127       /* Found our driver, let's try it */
    00128       Driver *newd = d->CreateInstance();
    00129
    00130       const char *err = newd->Start(parms);
    00131       if (err != NULL) {
    00132         delete newd;
    00133         usererror("Unable to load driver '%s'. The error was: %s", d->name, err);
    00134       }
    00135
    00136       DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
    00137       delete *GetActiveDriver(type);
    00138       *GetActiveDriver(type) = newd;
    00139       return newd;
    00140     }
    00141     usererror("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
    00142   }
    00143 }
    00144
    00152 void DriverFactoryBase::RegisterDriver(const char *name, Driver::Type type, int priority)
    00153 {
    00154   /* Don't register nameless Drivers */
    00155   if (name == NULL) return;
    00156
    00157   this->name = strdup(name);
    00158   this->type = type;
    00159   this->priority = priority;
    00160
    00161   /* Prefix the name with driver type to make it unique */
    00162   char buf[32];
    00163   strecpy(buf, GetDriverTypeName(type), lastof(buf));
    00164   strecpy(buf + 5, name, lastof(buf));
    00165
    00166   const char *longname = strdup(buf);
    00167
    00168   std::pair<Drivers::iterator, bool> P = GetDrivers().insert(Drivers::value_type(longname, this));
    00169   assert(P.second);
    00170 }
    00171
    00175 char *DriverFactoryBase::GetDriversInfo(char *p, const char *last)
    00176 {
    00177   for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
    00178     p += seprintf(p, last, "List of %s drivers:\n", GetDriverTypeName(type));
    00179
    00180     for (int priority = 10; priority >= 0; priority--) {
    00181       Drivers::iterator it = GetDrivers().begin();
    00182       for (; it != GetDrivers().end(); it++) {
    00183         DriverFactoryBase *d = (*it).second;
    00184         if (d->type != type) continue;
    00185         if (d->priority != priority) continue;
    00186         p += seprintf(p, last, "%18s: %s\n", d->name, d->GetDescription());
    00187       }
    00188     }
    00189
    00190     p += seprintf(p, last, "\n");
    00191   }
    00192
    00193   return p;
    00194 }
    00195
    00198 DriverFactoryBase::~DriverFactoryBase()
    00199 {
    00200   if (this->name == NULL) return;
    00201
    00202   /* Prefix the name with driver type to make it unique */
    00203   char buf[32];
    00204   strecpy(buf, GetDriverTypeName(type), lastof(buf));
    00205   strecpy(buf + 5, this->name, lastof(buf));
    00206
    00207   Drivers::iterator it = GetDrivers().find(buf);
    00208   assert(it != GetDrivers().end());
    00209
    00210   const char *longname = (*it).first;
    00211
    00212   GetDrivers().erase(it);
    00213   free((void *)longname);
    00214
    00215   if (GetDrivers().empty()) delete &GetDrivers();
    00216   free((void *)this->name);
    00217 }