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/*
* 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 "error.h"
#include "sound/sound_driver.hpp"
#include "music/music_driver.hpp"
#include "video/video_driver.hpp"
#include "string_func.h"
#include "table/strings.h"
#include <string>
#include <sstream>
#include "safeguards.h"
std::string _ini_videodriver; ///< The video driver a stored in the configuration file.
std::vector<Dimension> _resolutions; ///< List of resolutions.
Dimension _cur_resolution; ///< The current resolution.
bool _rightclick_emulate; ///< Whether right clicking is emulated.
std::string _ini_sounddriver; ///< The sound driver a stored in the configuration file.
std::string _ini_musicdriver; ///< The music driver a stored in the configuration file.
std::string _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 StringList &parm, const char *name)
{
if (parm.empty()) return nullptr;
size_t len = strlen(name);
for (auto &p : parm) {
if (p.compare(0, len, name) == 0) {
if (p.length() == len) return "";
if (p[len] == '=') return p.c_str() + len + 1;
}
}
return nullptr;
}
/**
* 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 StringList &parm, const char *name)
{
return GetDriverParam(parm, name) != nullptr;
}
/**
* 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 StringList &parm, const char *name, int def)
{
const char *p = GetDriverParam(parm, name);
return p != nullptr ? 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.
*/
void DriverFactoryBase::SelectDriver(const std::string &name, Driver::Type type)
{
if (!DriverFactoryBase::SelectDriverImpl(name, type)) {
name.empty() ?
usererror("Failed to autoprobe %s driver", GetDriverTypeName(type)) :
usererror("Failed to select requested %s driver '%s'", GetDriverTypeName(type), name.c_str());
}
}
/**
* 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.
* @return True upon success, otherwise false.
*/
bool DriverFactoryBase::SelectDriverImpl(const std::string &name, Driver::Type type)
{
if (GetDrivers().size() == 0) return false;
if (name.empty()) {
/* 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;
if (type == Driver::DT_VIDEO && !_video_hw_accel && d->UsesHardwareAcceleration()) continue;
Driver *oldd = *GetActiveDriver(type);
Driver *newd = d->CreateInstance();
*GetActiveDriver(type) = newd;
const char *err = newd->Start({});
if (err == nullptr) {
Debug(driver, 1, "Successfully probed {} driver '{}'", GetDriverTypeName(type), d->name);
delete oldd;
return true;
}
*GetActiveDriver(type) = oldd;
Debug(driver, 1, "Probing {} driver '{}' failed with error: {}", GetDriverTypeName(type), d->name, err);
delete newd;
if (type == Driver::DT_VIDEO && _video_hw_accel && d->UsesHardwareAcceleration()) {
_video_hw_accel = false;
ErrorMessageData msg(STR_VIDEO_DRIVER_ERROR, STR_VIDEO_DRIVER_ERROR_NO_HARDWARE_ACCELERATION);
ScheduleErrorMessage(msg);
}
}
}
usererror("Couldn't find any suitable %s driver", GetDriverTypeName(type));
} else {
/* Extract the driver name and put parameter list in parm */
std::istringstream buffer(name);
std::string dname;
std::getline(buffer, dname, ':');
std::string param;
std::vector<std::string> parms;
while (std::getline(buffer, param, ',')) {
parms.push_back(param);
}
/* 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(dname.c_str(), d->name) != 0) continue;
/* Found our driver, let's try it */
Driver *newd = d->CreateInstance();
const char *err = newd->Start(parms);
if (err != nullptr) {
delete newd;
usererror("Unable to load driver '%s'. The error was: %s", d->name, err);
}
Debug(driver, 1, "Successfully loaded {} driver '{}'", GetDriverTypeName(type), d->name);
delete *GetActiveDriver(type);
*GetActiveDriver(type) = newd;
return true;
}
usererror("No such %s driver: %s\n", GetDriverTypeName(type), dname.c_str());
}
}
/**
* 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));
Drivers &drivers = GetDrivers();
assert(drivers.find(buf) == drivers.end());
drivers.insert(Drivers::value_type(buf, this));
}
/**
* 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());
GetDrivers().erase(it);
if (GetDrivers().empty()) delete &GetDrivers();
}
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