aboutsummaryrefslogtreecommitdiff
path: root/engines/adl/hires6.cpp
blob: c42b4165a6f6689577b79cf7a847e00cf4f58524 (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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "common/system.h"
#include "common/debug.h"
#include "common/error.h"
#include "common/file.h"
#include "common/stream.h"
#include "common/memstream.h"

#include "adl/hires6.h"
#include "adl/display.h"
#include "adl/graphics.h"
#include "adl/disk.h"

namespace Adl {

static const char *disks[] = { "DARK1A.DSK", "DARK1B.NIB", "DARK2A.NIB", "DARK2B.NIB" };

#define SECTORS_PER_TRACK 16
#define BYTES_PER_SECTOR 256

static Common::MemoryReadStream *loadSectors(DiskImage *disk, byte track, byte sector = SECTORS_PER_TRACK - 1, byte count = SECTORS_PER_TRACK) {
	const int bufSize = count * BYTES_PER_SECTOR;
	byte *const buf = (byte *)malloc(bufSize);
	byte *p = buf;

	while (count-- > 0) {
		StreamPtr stream(disk->createReadStream(track, sector, 0, 0));
		stream->read(p, BYTES_PER_SECTOR);

		if (stream->err() || stream->eos())
			error("Error loading from disk image");

		p += BYTES_PER_SECTOR;
		if (sector > 0)
			--sector;
		else {
			++track;

			// Skip VTOC track
			if (track == 17)
				++track;

			sector = SECTORS_PER_TRACK - 1;
		}
	}

	return new Common::MemoryReadStream(buf, bufSize, DisposeAfterUse::YES);
}

void HiRes6Engine::runIntro() const {
	DiskImage_DSK *boot(new DiskImage_DSK());

	if (!boot->open(disks[0]))
		error("Failed to open disk image '%s'", disks[0]);

	StreamPtr stream(loadSectors(boot, 11, 1, 96));

	_display->setMode(DISPLAY_MODE_HIRES);
	_display->loadFrameBuffer(*stream);
	_display->updateHiResScreen();
	delay(256 * 8609 / 1000);

	_display->loadFrameBuffer(*stream);
	_display->updateHiResScreen();
	delay(256 * 8609 / 1000);

	_display->loadFrameBuffer(*stream);

	delete boot;

	// Load copyright string from boot file
	Files_DOS33 *files(new Files_DOS33());

	if (!files->open(disks[0]))
		error("Failed to open disk image '%s'", disks[0]);

	stream.reset(files->createReadStream("\010\010\010\010\010\010"));
	Common::String copyright(readStringAt(*stream, 0x103, APPLECHAR('\r')));

	delete files;

	_display->updateHiResScreen();
	_display->home();
	_display->setMode(DISPLAY_MODE_MIXED);
	_display->moveCursorTo(Common::Point(0, 21));
	_display->printString(copyright);
	delay(256 * 8609 / 1000);
}

void HiRes6Engine::init() {
	_boot = new DiskImage_DSK();
	_graphics = new Graphics_v2(*_display);

	if (!_boot->open(disks[0]))
		error("Failed to open disk image '%s'", disks[0]);

	StreamPtr stream(loadSectors(_boot, 0x7));

	// Read parser messages
	_strings.verbError = readStringAt(*stream, 0x666);
	_strings.nounError = readStringAt(*stream, 0x6bd);
	_strings.enterCommand = readStringAt(*stream, 0x6e9);

	// Read line feeds
	_strings.lineFeeds = readStringAt(*stream, 0x408);

	// Read opcode strings (TODO)
	_strings_v2.saveInsert = readStringAt(*stream, 0xad8);
	readStringAt(*stream, 0xb95); // Confirm save
	// _strings_v2.saveReplace
	_strings_v2.restoreInsert = readStringAt(*stream, 0xc07);
	// _strings_v2.restoreReplace
	_strings.playAgain = readStringAt(*stream, 0xcdf, 0xff);

	_messageIds.cantGoThere = IDI_HR6_MSG_CANT_GO_THERE;
	_messageIds.dontUnderstand = IDI_HR6_MSG_DONT_UNDERSTAND;
	_messageIds.itemDoesntMove = IDI_HR6_MSG_ITEM_DOESNT_MOVE;
	_messageIds.itemNotHere = IDI_HR6_MSG_ITEM_NOT_HERE;
	_messageIds.thanksForPlaying = IDI_HR6_MSG_THANKS_FOR_PLAYING;

	// Item descriptions
	stream.reset(loadSectors(_boot, 0x6, 0xb, 2));
	stream->seek(0x34);
	for (uint i = 0; i < IDI_HR6_NUM_ITEM_DESCS; ++i)
		_itemDesc.push_back(readString(*stream, 0xff));

	// Load dropped item offsets
	stream.reset(_boot->createReadStream(0x8, 0x9, 0x16));
	for (uint i = 0; i < IDI_HR6_NUM_ITEM_OFFSETS; ++i) {
		Common::Point p;
		p.x = stream->readByte();
		p.y = stream->readByte();
		_itemOffsets.push_back(p);
	}

	// Location of game data for each disc
	stream.reset(_boot->createReadStream(0x5, 0xa, 0x03));
	for (uint i = 0; i < sizeof(disks); ++i) {
		DiskDataDesc desc;
		desc.track = stream->readByte();
		desc.sector = stream->readByte();
		desc.offset = stream->readByte();
		desc.volume = stream->readByte();
		_diskDataDesc.push_back(desc);
	}

	// DataBlockPtr offsets for each disk
	stream.reset(_boot->createReadStream(0x3, 0xf, 0x03));
	for (uint i = 0; i < sizeof(disks); ++i) {
		DiskOffset offset;
		offset.track = stream->readByte();
		offset.sector = stream->readByte();
		_diskOffsets.push_back(offset);
	}
}

void HiRes6Engine::loadDisk(byte disk) {
	delete _disk;
	_disk = new DiskImage_NIB();

	if (!_disk->open(disks[disk]))
		error("Failed to open disk image '%s'", disks[disk]);

	_curDisk = 0;

	// Load item picture data (indexed on boot disk)
	StreamPtr stream(_boot->createReadStream(0xb, 0xd, 0x08));
	_itemPics.clear();
	for (uint i = 0; i < IDI_HR6_NUM_ITEM_PICS; ++i) {
		stream->readByte();
		_itemPics.push_back(readDataBlockPtr(*stream));
	}

	_curDisk = disk;

	byte track = _diskDataDesc[disk].track;
	byte sector = _diskDataDesc[disk].sector;
	uint offset = _diskDataDesc[disk].offset;

	applyDiskOffset(track, sector);

	for (uint block = 0; block < 7; ++block) {
		stream.reset(_disk->createReadStream(track, sector, offset, 1));

		uint16 addr = stream->readUint16LE();
		uint16 size = stream->readUint16LE();

		stream.reset(_disk->createReadStream(track, sector, offset, size / 256 + 1));
		stream->skip(4);

		switch (addr) {
		case 0x9000: {
			// Messages
			_messages.clear();
			uint count = size / 4;
			for (uint i = 0; i < count; ++i)
				_messages.push_back(readDataBlockPtr(*stream));
			break;
		}
		case 0x4a80: {
			// Global pics
			_pictures.clear();
			byte picNr;
			while ((picNr = stream->readByte()) != 0xff) {
				if (stream->eos() || stream->err())
					error("Error reading global pic list");
				_pictures[picNr] = readDataBlockPtr(*stream);
			}
			break;
		}
		case 0x4000:
			// Verbs
			loadWords(*stream, _verbs, _priVerbs);
			break;
		case 0x1800:
			// Nouns
			loadWords(*stream, _nouns, _priNouns);
			break;
		case 0x0e00: {
			// Rooms
			uint count = size / 14 - 1;
			stream->skip(14); // Skip invalid room 0

			_state.rooms.clear();
			for (uint i = 0; i < count; ++i) {
				Room room;
				stream->readByte(); // number
				for (uint j = 0; j < 6; ++j)
					room.connections[j] = stream->readByte();
				room.data = readDataBlockPtr(*stream);
				room.picture = stream->readByte();
				room.curPicture = stream->readByte();
				room.isFirstTime = stream->readByte();
				_state.rooms.push_back(room);
			}
			break;
		}
		case 0x7b00:
			// Global commands
			readCommands(*stream, _globalCommands);
			break;
		case 0x9500:
			// Room commands
			readCommands(*stream, _roomCommands);
			break;
		default:
			error("Unknown data block found (addr %04x; size %04x)", addr, size);
		}

		offset += 4 + size;
		while (offset >= 256) {
			offset -= 256;
			++sector;
			if (sector >= 16) {
				sector = 0;
				++track;
			}
		}
	}
}

void HiRes6Engine::initGameState() {
	_state.vars.resize(IDI_HR6_NUM_VARS);

	loadDisk(1);

	StreamPtr stream(_boot->createReadStream(0x3, 0xe, 0x03));

	byte id;
	while ((id = stream->readByte()) != 0xff) {
		Item item = Item();
		item.id = id;
		item.noun = stream->readByte();
		item.room = stream->readByte();
		item.picture = stream->readByte();
		item.isLineArt = stream->readByte(); // Now seems to be disk number
		item.position.x = stream->readByte();
		item.position.y = stream->readByte();
		item.state = stream->readByte();
		item.description = stream->readByte();

		stream->readByte(); // Struct size

		byte picListSize = stream->readByte();

		// Flag to keep track of what has been drawn on the screen
		stream->readByte();

		for (uint i = 0; i < picListSize; ++i)
			item.roomPictures.push_back(stream->readByte());

		_state.items.push_back(item);
	}

	_currVerb = _currNoun = 0;
}

void HiRes6Engine::showRoom() {
	bool redrawPic = false;

	if (getVar(26) == 0xfe)
		setVar(26, 0);
	else if (getVar(26) != 0xff)
		setVar(26, _state.room);

	if (_state.room != _roomOnScreen) {
		loadRoom(_state.room);

		if (getVar(26) < 0x80 && getCurRoom().isFirstTime)
			setVar(26, 0);

		clearScreen();

		if (!_state.isDark)
			redrawPic = true;
	} else {
		if (getCurRoom().curPicture != _picOnScreen || _itemRemoved)
			redrawPic = true;
	}

	if (redrawPic) {
		_roomOnScreen = _state.room;
		_picOnScreen = getCurRoom().curPicture;

		drawPic(getCurRoom().curPicture);
		_itemRemoved = false;
		_itemsOnScreen = 0;

		Common::List<Item>::iterator item;
		for (item = _state.items.begin(); item != _state.items.end(); ++item)
			item->isOnScreen = false;
	}

	if (!_state.isDark)
		drawItems();

	_display->updateHiResScreen();
	setVar(2, 0xff);
	printString(_roomData.description);

	// FIXME: move to main loop?
	_linesPrinted = 0;
}

Common::String HiRes6Engine::formatVerbError(const Common::String &verb) const {
	Common::String err = _strings.verbError;

	for (uint i = 0; i < verb.size(); ++i)
		err.setChar(verb[i], i + 24);

	err.setChar(APPLECHAR(' '), 32);

	uint i = 24;
	while (err[i] != APPLECHAR(' '))
		++i;

	err.setChar(APPLECHAR('.'), i);

	return err;
}

Common::String HiRes6Engine::formatNounError(const Common::String &verb, const Common::String &noun) const {
	Common::String err = _strings.nounError;

	for (uint i = 0; i < noun.size(); ++i)
		err.setChar(noun[i], i + 24);

	for (uint  i = 35; i > 31; --i)
		err.setChar(APPLECHAR(' '), i);

	uint i = 24;
	while (err[i] != APPLECHAR(' '))
		++i;

	err.setChar(APPLECHAR('I'), i + 1);
	err.setChar(APPLECHAR('S'), i + 2);
	err.setChar(APPLECHAR('.'), i + 3);

	return err;
}

void HiRes6Engine::printString(const Common::String &str) {
	Common::String s;
	uint found = 0;

	// This does not emulate the corner cases of the original, hence this check
	if (getVar(27) > 1)
		error("Invalid value %i encountered for variable 27", getVar(27));

	for (uint i = 0; i < str.size(); ++i) {
		if (str[i] == '%') {
			++found;
			if (found == 3)
				found = 0;
		} else {
			if (found == 0 || found - 1 == getVar(27))
				s += str[i];
		}
	}

	if (getVar(2) != 0xff) {
		AdlEngine_v2::printString(s);
	} else {
		if (getVar(26) == 0) {
			if (str.size() != 1 || APPLECHAR(str[0]) != APPLECHAR(' '))
				return AdlEngine_v2::printString(s);
			setVar(2, APPLECHAR(' '));
		} else if (getVar(26) != 0xff) {
			setVar(2, 'P');
		} else {
			setVar(26, _state.room);
			setVar(2, 1);
		}

		doAllCommands(_globalCommands, _currVerb, _currNoun);
	}
}

Engine *HiRes6Engine_create(OSystem *syst, const AdlGameDescription *gd) {
	return new HiRes6Engine(syst, gd);
}

} // End of namespace Adl