illusions.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef ILLUSIONS_ILLUSIONS_H
#define ILLUSIONS_ILLUSIONS_H

#include "illusions/graphics.h"
#include "audio/mixer.h"
#include "audio/decoders/aiff.h"

#include "common/array.h"
#include "common/events.h"
#include "common/file.h"
#include "common/memstream.h"
#include "common/random.h"
#include "common/str.h"
#include "common/substream.h"
#include "common/system.h"

#include "engines/engine.h"
#include "graphics/surface.h"
#include "illusions/detection.h"

namespace Illusions {

char *debugW2I(uint16 *wstr);
void swapBytesInWideString(byte * wstr);

#define ILLUSIONS_SAVEGAME_VERSION 0

class ResourceSystem;
class BaseResourceReader;

struct SurfInfo;

class ActorInstanceList;
struct ActorType;
class BackgroundInstanceList;
class BackgroundResource;
class Camera;
class Control;
class Controls;
class Cursor;
class Dictionary;
struct Fader;
class FramesList;
class Input;
class Screen;
class ScreenText;
class ScriptOpcodes;
class ScriptResource;
class ScriptStack;
struct Sequence;
class SoundMan;
class SpecialCode;
class TalkInstanceList;
class ThreadList;
class UpdateFunctions;
class GameState;
class ScreenPaletteBase;

class IllusionsEngine : public Engine {
public:
    IllusionsEngine(OSystem *syst, const IllusionsGameDescription *gd);
    ~IllusionsEngine() override;
    const Common::String getTargetName() { return _targetName; }
private:
    const IllusionsGameDescription *_gameDescription;
    Graphics::PixelFormat _pixelFormat;
public:

    Common::RandomSource *_random;
    Dictionary *_dict;
    ResourceSystem *_resSys;
    BaseResourceReader *_resReader;
    UpdateFunctions *_updateFunctions;
    GameState *_gameState;

    void updateEvents();

    Screen *_screen;
    ScreenPaletteBase *_screenPalette;
    ScreenText *_screenText;
    Input *_input;
    ActorInstanceList *_actorInstances;
    BackgroundInstanceList *_backgroundInstances;
    Camera *_camera;
    Controls *_controls;
    TalkInstanceList *_talkItems;
    ScriptOpcodes *_scriptOpcodes;
    SpecialCode *_specialCode;
    ThreadList *_threads;
    SoundMan *_soundMan;

    uint32 _nextTempThreadId;
    bool _doScriptThreadInit;
    ScriptStack *_stack;
    ScriptResource *_scriptResource;
    bool _rerunThreads;

    Fader *_fader;

    int _pauseCtr;

    int _resGetCtr;
    uint32 _resGetTime;
    bool _unpauseControlActorFlag;
    uint32 _lastUpdateTime;

    int _resumeFromSavegameRequested;
    int _savegameSlotNum;
    Common::String _savegameDescription;
    uint32 _savegameSceneId;
    uint32 _savegameThreadId;

    uint32 _fontId;
    int _field8;
    uint32 _fieldA;
    uint32 _subtitleDuration;

    WidthHeight _defaultTextDimensions;
    Common::Point _defaultTextPosition;

    int16 _menuChoiceOfs;

    int getGameId() const;
    Common::Language getGameLanguage() const;

    void runUpdateFunctions();
    int updateActors(uint flags);
    int updateSequences(uint flags);
    int updateGraphics(uint flags);
    int updateSoundMan(uint flags);
    int updateSprites(uint flags);

    uint32 getElapsedUpdateTime();
    Common::Point *getObjectActorPositionPtr(uint32 objectId);
    int getRandom(int max);
    int convertPanXCoord(int16 x);
    bool calcPointDirection(Common::Point &srcPt, Common::Point &dstPt, uint &facing);
    bool isSoundActive();

    virtual void updateFader() {};
    virtual void clearFader() {};
    virtual void pauseFader() {};
    virtual void unpauseFader() {};
    virtual bool isVideoPlaying() { return false; }

    void setCurrFontId(uint32 fontId);
    bool checkActiveTalkThreads();
    void setTextDuration(int kind, uint32 duration);
    uint32 clipTextDuration(uint32 duration);
    void getDefaultTextDimensions(WidthHeight &dimensions);
    void setDefaultTextDimensions(WidthHeight &dimensions);
    void getDefaultTextPosition(Common::Point &position);
    void setDefaultTextPosition(Common::Point &position);

    uint16 getSubtitleDuration();
    void setSubtitleDuration(uint16 duration);

    FramesList *findActorSequenceFrames(Sequence *sequence);

    virtual void setDefaultTextCoords() = 0;
    virtual void loadSpecialCode(uint32 resId) = 0;
    virtual void unloadSpecialCode(uint32 resId) = 0;
    virtual void notifyThreadId(uint32 &threadId) = 0;
    virtual bool testMainActorFastWalk(Control *control) = 0;
    virtual bool testMainActorCollision(Control *control) = 0;
    virtual Control *getObjectControl(uint32 objectId) = 0;
    virtual Common::Point getNamedPointPosition(uint32 namedPointId) = 0;
    virtual uint32 getPriorityFromBase(int16 priority) = 0;
    virtual uint32 getPrevScene() = 0;
    virtual uint32 getCurrentScene() = 0;
    virtual bool isCursorObject(uint32 actorTypeId, uint32 objectId) = 0;
    virtual void setCursorControlRoutine(Control *control) = 0;
    virtual void placeCursorControl(Control *control, uint32 sequenceId) = 0;
    virtual void setCursorControl(Control *control) = 0;
    virtual void showCursor() = 0;
    virtual void hideCursor() = 0;
    virtual void startScriptThreadSimple(uint32 threadId, uint32 callingThreadId) = 0;
    virtual uint32 startTempScriptThread(byte *scriptCodeIp, uint32 callingThreadId,
        uint32 value8, uint32 valueC, uint32 value10) = 0;

    // Savegame API

    enum kReadSaveHeaderError {
        kRSHENoError = 0,
        kRSHEInvalidType = 1,
        kRSHEInvalidVersion = 2,
        kRSHEIoError = 3
    };

    struct SaveHeader {
        Common::String description;
        uint32 version;
        byte gameID;
        uint32 flags;
        uint32 saveDate;
        uint32 saveTime;
        uint32 playTime;
        Graphics::Surface *thumbnail;
    };

    bool _isSaveAllowed;

    bool canLoadGameStateCurrently(Common::U32String *msg = nullptr) override { return _isSaveAllowed; }
    bool canSaveGameStateCurrently(Common::U32String *msg = nullptr) override { return _isSaveAllowed; }
    Common::Error loadGameState(int slot) override;
    Common::Error saveGameState(int slot, const Common::String &desc, bool isAutosave = false) override;
    Common::Error removeGameState(int slot);
    bool savegame(const char *filename, const char *description);
    bool loadgame(const char *filename);
    bool existsSavegame(int num);
    static Common::String getSavegameFilename(const Common::String &target, int num);
    static kReadSaveHeaderError readSaveHeader(Common::SeekableReadStream *in, SaveHeader &header, bool skipThumbnail = true);

};

} // End of namespace Illusions

#endif // ILLUSIONS_ILLUSIONS_H