aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/engine/state.h
blob: e7499e66c9d6477ab5b12612998ce355bdb4ff46 (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
/* 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.
 *
 */

#ifndef SCI_INCLUDE_ENGINE_H
#define SCI_INCLUDE_ENGINE_H

#include "common/scummsys.h"
#include "common/array.h"
#include "common/serializer.h"
#include "common/str-array.h"

namespace Common {
class SeekableReadStream;
class WriteStream;
}

#include "sci/sci.h"
#include "sci/engine/file.h"
#include "sci/engine/seg_manager.h"

#include "sci/parser/vocabulary.h"

#include "sci/sound/soundcmd.h"

namespace Sci {

class FileHandle;
class DirSeeker;
class EventManager;
class MessageState;
class SoundCommandParser;
class VirtualIndexFile;

enum AbortGameState {
	kAbortNone = 0,
	kAbortLoadGame = 1,
	kAbortRestartGame = 2,
	kAbortQuitGame = 3
};

// We assume that scripts give us savegameId 0->99 for creating a new save slot
//  and savegameId 100->199 for existing save slots. Refer to kfile.cpp
enum {
	SAVEGAMEID_OFFICIALRANGE_START = 100,
	SAVEGAMEID_OFFICIALRANGE_END = 199
};

enum {
	GAMEISRESTARTING_NONE = 0,
	GAMEISRESTARTING_RESTART = 1,
	GAMEISRESTARTING_RESTORE = 2
};

enum VideoFlags {
	kNone            = 0,
	kDoubled         = 1 << 0,
	kDropFrames      = 1 << 1,
	kBlackLines      = 1 << 2,
	kUnkBit3         = 1 << 3,
	kGammaBoost      = 1 << 4,
	kHoldBlackFrame  = 1 << 5,
	kHoldLastFrame   = 1 << 6,
	kUnkBit7         = 1 << 7,
	kStretch         = 1 << 8
};

struct VideoState {
	Common::String fileName;
	uint16 x;
	uint16 y;
	uint16 flags;

	void reset() {
		fileName = "";
		x = y = flags = 0;
	}
};

struct EngineState : public Common::Serializable {
public:
	EngineState(SegManager *segMan);
	virtual ~EngineState();

	virtual void saveLoadWithSerializer(Common::Serializer &ser);

public:
	SegManager *_segMan; /**< The segment manager */

	/* Non-VM information */

	uint32 lastWaitTime; /**< The last time the game invoked Wait() */
	uint32 _screenUpdateTime;	/**< The last time the game updated the screen */

	void speedThrottler(uint32 neededSleep);
	void wait(int16 ticks);

	uint32 _throttleCounter; /**< total times kAnimate was invoked */
	uint32 _throttleLastTime; /**< last time kAnimate was invoked */
	bool _throttleTrigger;
	bool _gameIsBenchmarking;

	/* Kernel File IO stuff */

	Common::Array<FileHandle> _fileHandles; /**< Array of file handles. Dynamically increased if required. */

	DirSeeker _dirseeker;

	int16 _lastSaveVirtualId; // last virtual id fed to kSaveGame, if no kGetSaveFiles was called inbetween
	int16 _lastSaveNewId;    // last newly created filename-id by kSaveGame

#ifdef ENABLE_SCI32
	VirtualIndexFile *_virtualIndexFile;
#endif

	// see detection.cpp / SciEngine::loadGameState()
	bool _delayedRestoreGame;  // boolean, that triggers delayed restore (triggered by ScummVM menu)
	int _delayedRestoreGameId; // the saved game id, that it supposed to get restored (triggered by ScummVM menu)

	uint _chosenQfGImportItem; // Remembers the item selected in QfG import rooms

	bool _cursorWorkaroundActive; // Refer to GfxCursor::setPosition()
	Common::Point _cursorWorkaroundPoint;
	Common::Rect _cursorWorkaroundRect;

public:
	/* VM Information */

	Common::List<ExecStack> _executionStack; /**< The execution stack */
	/**
	 * When called from kernel functions, the vm is re-started recursively on
	 * the same stack. This variable contains the stack base for the current vm.
	 */
	int executionStackBase;
	bool _executionStackPosChanged;   /**< Set to true if the execution stack position should be re-evaluated by the vm */

	// Registers
	reg_t r_acc; /**< Accumulator */
	reg_t r_prev; /**< previous comparison result */
	int16 r_rest; /**< current &rest register */

	StackPtr stack_base; /**< Pointer to the least stack element */
	StackPtr stack_top; /**< First invalid stack element */

	// Script state
	ExecStack *xs;
	reg_t *variables[4];		///< global, local, temp, param, as immediate pointers
	reg_t *variablesBase[4];	///< Used for referencing VM ops
	SegmentId variablesSegment[4];	///< Same as above, contains segment IDs
	int variablesMax[4];		///< Max. values for all variables

	AbortGameState abortScriptProcessing;
	int16 gameIsRestarting; // is set when restarting (=1) or restoring the game (=2)

	int scriptStepCounter; // Counts the number of steps executed
	int scriptGCInterval; // Number of steps in between gcs

	uint16 currentRoomNumber() const;
	void setRoomNumber(uint16 roomNumber);

	/**
	 * Sets global variables from script 0
	 */
	void initGlobals();

	/**
	 * Shrink execution stack to size.
	 * Contains an assert if it is not already smaller.
	 */
	void shrinkStackToBase();

	int gcCountDown; /**< Number of kernel calls until next gc */

	MessageState *_msgState;

	// MemorySegment provides access to a 256-byte block of memory that remains
	// intact across restarts and restores
	enum {
		kMemorySegmentMax = 256
	};
	uint16 _memorySegmentSize;
	byte _memorySegment[kMemorySegmentMax];

	VideoState _videoState;
	uint16 _vmdPalStart, _vmdPalEnd;
	bool _syncedAudioOptions;

	uint16 _palCycleToColor;

	/**
	 * Resets the engine state.
	 */
	void reset(bool isRestoring);
};

} // End of namespace Sci

#endif // SCI_INCLUDE_ENGINE_H