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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file driver.cpp Base for all driver handling. */
#include "stdafx.h"
#include "debug.h"
#include "sound/sound_driver.hpp"
#include "music/music_driver.hpp"
#include "video/video_driver.hpp"
#include "string_func.h"
#include "safeguards.h"
VideoDriver *_video_driver; ///< The currently active video driver.
char *_ini_videodriver; ///< The video driver a stored in the configuration file.
int _num_resolutions; ///< The number of resolutions.
Dimension _resolutions[32]; ///< List of resolutions.
Dimension _cur_resolution; ///< The current resolution.
bool _rightclick_emulate; ///< Whether right clicking is emulated.
SoundDriver *_sound_driver; ///< The currently active sound driver.
char *_ini_sounddriver; ///< The sound driver a stored in the configuration file.
MusicDriver *_music_driver; ///< The currently active music driver.
char *_ini_musicdriver; ///< The music driver a stored in the configuration file.
char *_ini_blitter; ///< The blitter as stored in the configuration file.
bool _blitter_autodetected; ///< Was the blitter autodetected or specified by the user?
/**
* Get a string parameter the list of parameters.
* @param parm The parameters.
* @param name The parameter name we're looking for.
* @return The parameter value.
*/
const char *GetDriverParam(const char * const *parm, const char *name)
{
size_t len;
if (parm == NULL) return NULL;
len = strlen(name);
for (; *parm != NULL; parm++) {
const char *p = *parm;
if (strncmp(p, name, len) == 0) {
if (p[len] == '=') return p + len + 1;
if (p[len] == '\0') return p + len;
}
}
return NULL;
}
/**
* Get a boolean parameter the list of parameters.
* @param parm The parameters.
* @param name The parameter name we're looking for.
* @return The parameter value.
*/
bool GetDriverParamBool(const char * const *parm, const char *name)
{
return GetDriverParam(parm, name) != NULL;
}
/**
* Get an integer parameter the list of parameters.
* @param parm The parameters.
* @param name The parameter name we're looking for.
* @param def The default value if the parameter doesn't exist.
* @return The parameter value.
*/
int GetDriverParamInt(const char * const *parm, const char *name, int def)
{
const char *p = GetDriverParam(parm, name);
return p != NULL ? atoi(p) : def;
}
/**
* Find the requested driver and return its class.
* @param name the driver to select.
* @param type the type of driver to select
* @post Sets the driver so GetCurrentDriver() returns it too.
*/
Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
{
if (GetDrivers().size() == 0) return NULL;
if (StrEmpty(name)) {
/* Probe for this driver, but do not fall back to dedicated/null! */
for (int priority = 10; priority > 0; priority--) {
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); ++it) {
DriverFactoryBase *d = (*it).second;
/* Check driver type */
if (d->type != type) continue;
if (d->priority != priority) continue;
Driver *newd = d->CreateInstance();
const char *err = newd->Start(NULL);
if (err == NULL) {
DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
delete *GetActiveDriver(type);
*GetActiveDriver(type) = newd;
return newd;
}
DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
delete newd;
}
}
usererror("Couldn't find any suitable %s driver", GetDriverTypeName(type));
} else {
char *parm;
char buffer[256];
const char *parms[32];
/* Extract the driver name and put parameter list in parm */
strecpy(buffer, name, lastof(buffer));
parm = strchr(buffer, ':');
parms[0] = NULL;
if (parm != NULL) {
uint np = 0;
/* Tokenize the parm. */
do {
*parm++ = '\0';
if (np < lengthof(parms) - 1) parms[np++] = parm;
while (*parm != '\0' && *parm != ',') parm++;
} while (*parm == ',');
parms[np] = NULL;
}
/* Find this driver */
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); ++it) {
DriverFactoryBase *d = (*it).second;
/* Check driver type */
if (d->type != type) continue;
/* Check driver name */
if (strcasecmp(buffer, d->name) != 0) continue;
/* Found our driver, let's try it */
Driver *newd = d->CreateInstance();
const char *err = newd->Start(parms);
if (err != NULL) {
delete newd;
usererror("Unable to load driver '%s'. The error was: %s", d->name, err);
}
DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
delete *GetActiveDriver(type);
*GetActiveDriver(type) = newd;
return newd;
}
usererror("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
}
}
/**
* Build a human readable list of available drivers, grouped by type.
* @param p The buffer to write to.
* @param last The last element in the buffer.
* @return The end of the written buffer.
*/
char *DriverFactoryBase::GetDriversInfo(char *p, const char *last)
{
for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
p += seprintf(p, last, "List of %s drivers:\n", GetDriverTypeName(type));
for (int priority = 10; priority >= 0; priority--) {
Drivers::iterator it = GetDrivers().begin();
for (; it != GetDrivers().end(); it++) {
DriverFactoryBase *d = (*it).second;
if (d->type != type) continue;
if (d->priority != priority) continue;
p += seprintf(p, last, "%18s: %s\n", d->name, d->GetDescription());
}
}
p += seprintf(p, last, "\n");
}
return p;
}
/**
* Construct a new DriverFactory.
* @param type The type of driver.
* @param priority The priority within the driver class.
* @param name The name of the driver.
* @param description A long-ish description of the driver.
*/
DriverFactoryBase::DriverFactoryBase(Driver::Type type, int priority, const char *name, const char *description) :
type(type), priority(priority), name(name), description(description)
{
/* Prefix the name with driver type to make it unique */
char buf[32];
strecpy(buf, GetDriverTypeName(type), lastof(buf));
strecpy(buf + 5, name, lastof(buf));
const char *longname = stredup(buf);
std::pair<Drivers::iterator, bool> P = GetDrivers().insert(Drivers::value_type(longname, this));
assert(P.second);
}
/**
* Frees memory used for this->name
*/
DriverFactoryBase::~DriverFactoryBase()
{
/* Prefix the name with driver type to make it unique */
char buf[32];
strecpy(buf, GetDriverTypeName(type), lastof(buf));
strecpy(buf + 5, this->name, lastof(buf));
Drivers::iterator it = GetDrivers().find(buf);
assert(it != GetDrivers().end());
const char *longname = (*it).first;
GetDrivers().erase(it);
free(longname);
if (GetDrivers().empty()) delete &GetDrivers();
}
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