summaryrefslogtreecommitdiff
path: root/src/driver.cpp
blob: a71f21cc7bed72b2bc83baac532388561106fd65 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/* $Id$ */

/** @file driver.cpp Base for all driver handling. */

#include "stdafx.h"
#include "openttd.h"
#include "debug.h"
#include "driver.h"

#include "sound/sound_driver.hpp"
#include "music/music_driver.hpp"
#include "video/video_driver.hpp"

VideoDriver *_video_driver;
char _ini_videodriver[32];
int _num_resolutions;
uint16 _resolutions[32][2];
uint16 _cur_resolution[2];

SoundDriver *_sound_driver;
char _ini_sounddriver[32];

MusicDriver *_music_driver;
char _ini_musicdriver[32];

char _ini_blitter[32];

static 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;
}

bool GetDriverParamBool(const char* const* parm, const char* name)
{
	return GetDriverParam(parm, name) != NULL;
}

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.
 * @post Sets the driver so GetCurrentDriver() returns it too.
 */
const Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
{
	if (GetDrivers().size() == 0) return NULL;

	if (*name == '\0') {
		/* Probe for this driver */
		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;
			}
		}
		error("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;
				error("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;
		}
		error("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
	}
}

/**
 * Register a driver internally, based on its name.
 * @param name the name of the driver.
 * @note an assert() will be trigger if 2 driver with the same name try to register.
 */
void DriverFactoryBase::RegisterDriver(const char *name, Driver::Type type, int priority)
{
	/* Don't register nameless Drivers */
	if (name == NULL) return;

	this->name = strdup(name);
	this->type = type;
	this->priority = priority;

	/* 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));

#if !defined(NDEBUG) || defined(WITH_ASSERT)
	/* NDEBUG disables asserts and gives a warning: unused variable 'P' */
	std::pair<Drivers::iterator, bool> P =
#endif /* !NDEBUG */
	GetDrivers().insert(Drivers::value_type(buf, this));
	assert(P.second);
}

/**
 * Build a human readable list of available drivers, grouped by type.
 */
char *DriverFactoryBase::GetDriversInfo(char *p, const char *last)
{
	for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) {
		p += snprintf(p, last - p, "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 += snprintf(p, last - p, "%18s: %s\n", d->name, d->GetDescription());
			}
		}

		p += snprintf(p, last - p, "\n");
	}

	return p;
}