bbvs.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 BBVS_BBVS_H
#define BBVS_BBVS_H

#include "audio/mixer.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 "bbvs/detection.h"

struct ADGameDescription;

namespace Bbvs {

class ActionCommands;
struct Action;
class GameModule;
struct Condition;
struct Conditions;
struct ActionResult;
struct ActionResults;
struct ActionCommand;
struct CameraInit;
struct SceneObjectDef;
struct SceneObjectInit;
struct SceneExit;
struct Animation;
struct SceneSound;
class DrawList;
class SpriteModule;
class Screen;
class SoundMan;

#define BBVS_SAVEGAME_VERSION 0

enum {
    kVerbLook      = 0,
    kVerbUse       = 1,
    kVerbTalk      = 2,
    kVerbWalk      = 3,
    kVerbInvItem   = 4,
    kVerbShowInv   = 5
};

enum {
    kITNone         = 0,
    kITEmpty        = 1,
    KITSceneObject  = 2,
    kITBgObject     = 3,
    kITDialog       = 4,
    kITScroll       = 5,
    kITSceneExit    = 6,
    kITInvItem      = 7
};

enum {
    kGSScene        = 0,
    kGSInventory    = 1,
    kGSVerbs        = 2,
    kGSWait         = 3,
    kGSDialog       = 4,
    kGSWaitDialog   = 5
};

enum {
    kActionCmdStop                  = 0,
    kActionCmdWalkObject            = 3,
    kActionCmdMoveObject            = 4,
    kActionCmdAnimObject            = 5,
    kActionCmdSetCameraPos          = 7,
    kActionCmdPlaySpeech            = 8,
    kActionCmdPlaySound             = 10,
    kActionCmdStartBackgroundSound  = 11,
    kActionCmdStopBackgroundSound   = 12
};

enum {
    kCondUnused                     = 1,
    kCondSceneObjectVerb            = 2,
    kCondBgObjectVerb               = 3,
    kCondSceneObjectInventory       = 4,
    kCondBgObjectInventory          = 5,
    kCondHasInventoryItem           = 6,
    kCondHasNotInventoryItem        = 7,
    kCondIsGameVar                  = 8,
    kCondIsNotGameVar               = 9,
    kCondIsPrevSceneNum             = 10,
    kCondIsCurrTalkObject           = 11,
    kCondIsDialogItem               = 12,
    kCondIsCameraNum                = 13,
    kCondIsNotPrevSceneNum          = 14,
    kCondDialogItem0                = 15,
    kCondIsButtheadAtBgObject       = 16,
    kCondIsNotSceneVisited          = 17,
    kCondIsSceneVisited             = 18,
    kCondIsCameraNumTransition      = 19
};

enum {
    kActResAddInventoryItem     = 1,
    kActResRemoveInventoryItem  = 2,
    kActResSetGameVar           = 3,
    kActResUnsetGameVar         = 4,
    kActResStartDialog          = 5,
    kActResChangeScene          = 6
};

enum {
    kLeftButtonClicked  = 1,
    kRightButtonClicked = 2,
    kLeftButtonDown     = 4,
    kRightButtonDown    = 8,
    kAnyButtonClicked   = kLeftButtonClicked | kRightButtonClicked,
    kAnyButtonDown      = kLeftButtonDown | kRightButtonDown
};

struct BBPoint {
    int16 x, y;
};

struct BBRect {
    int16 x, y, width, height;
};

struct BBPolygon {
    const BBPoint *points;
    int pointsCount;
};

struct Rect {
    int16 left, top, right, bottom;
};

struct SceneObject {
    uint32 x, y;
    SceneObjectDef *sceneObjectDef;
    Animation *anim;
    int animIndex;
    int frameIndex;
    int frameTicks;
    int walkCount;
    int xIncr, yIncr;
    int turnValue, turnCount, turnTicks;
    Common::Point walkDestPt;

    SceneObject() {
        clear();
    }

    void clear() {
        x = 0;
        y = 0;
        sceneObjectDef = nullptr;
        anim = nullptr;
        animIndex = 0;
        frameIndex = 0;
        frameTicks = 0;
        walkCount = 0;
        xIncr = 0;
        yIncr = 0;
        turnValue = 0;
        turnCount = 0;
        turnTicks = 0;
        walkDestPt.x = 0;
        walkDestPt.y = 0;
    }
};

struct SceneObjectAction {
    int sceneObjectIndex;
    int animationIndex;
    Common::Point walkDest;
};

struct WalkInfo {
    int16 x, y;
    int delta;
    int direction;
    Common::Point midPt;
    int walkAreaIndex;
};

struct WalkArea {
    int16 x, y, width, height;
    bool checked;
    int linksCount;
    WalkArea *links[16];
    WalkInfo *linksD1[32];
    WalkInfo *linksD2[32];
    bool contains(const Common::Point &pt) const;
};

const int kSnapshotSize = 23072;
const int kSceneObjectsCount = 64;
const int kSceneSoundsCount = 8;
const int kInventoryItemStatusCount = 50;
const int kDialogItemStatusCount = 50;
const int kGameVarsCount = 2000;
const int kSceneVisitedCount = 64;

const int kMainMenu = 44;
const int kCredits  = 45;

const int kMaxDistance = 0xFFFFFF;
static const int8 kWalkTurnTbl[] = {
    7, 9, 4, 8, 6, 10, 5, 11
};

class BbvsEngine : public Engine {
protected:
    Common::Error run() override;
    bool hasFeature(EngineFeature f) const override;
public:
    BbvsEngine(OSystem *syst, const ADGameDescription *gd);
    ~BbvsEngine() override;
    void newGame();
    void continueGameFromQuickSave();
    void setNewSceneNum(int newSceneNum);
    const Common::String getTargetName() { return _targetName; }
    const ADGameDescription *_gameDescription;

    bool isDemo() const;
    bool isLoogieDemo() const;
    bool isLoogieAltDemo() const;

    int getAutosaveSlot() const override { return -1; }
private:
    Graphics::PixelFormat _pixelFormat;

#ifdef USE_TRANSLATION
    Common::String _oldGUILanguage;
#endif

public:
    Common::RandomSource *_random;

    GameModule *_gameModule;
    SpriteModule *_spriteModule;
    SoundMan *_sound;

    Screen *_screen;

    int _bootSaveSlot;

    int _mouseX, _mouseY;
    uint _mouseButtons;
    Common::KeyCode _keyCode;

    int _mouseCursorSpriteIndex;

    int _gameState;
    int _gameTicks;

    Common::Point _mousePos;
    Common::Point _verbPos;
    Common::Point _walkMousePos;

    int _activeItemType;
    int _activeItemIndex;
    int _currTalkObjectIndex;

    Common::Point _cameraPos, _newCameraPos;

    int _newSceneNum, _prevSceneNum, _currSceneNum;
    int _playVideoNumber;

    int _dialogSlotCount;
    byte _dialogItemStatus[kDialogItemStatusCount];

    byte _gameVars[kGameVarsCount];
    byte _sceneVisited[kSceneVisitedCount];

    int _currVerbNum;

    int _currInventoryItem;
    byte _inventoryItemStatus[kInventoryItemStatusCount];
    int _inventoryButtonIndex;

    Action *_currAction;
    uint32 _currActionCommandTimeStamp;
    int _currActionCommandIndex;

    Common::Array<Action*> _walkAreaActions;

    SceneObject _sceneObjects[kSceneObjectsCount];
    Common::Array<SceneObjectAction> _sceneObjectActions;

    SceneObject *_buttheadObject, *_beavisObject;
    int _currCameraNum;

    byte _backgroundSoundsActive[kSceneSoundsCount];
    Audio::SoundHandle _speechSoundHandle;

    int _walkAreasCount;
    WalkArea _walkAreas[80];
    int _walkInfosCount;
    WalkInfo _walkInfos[256];
    int _walkableRectsCount;
    Common::Rect _walkableRects[256];
    Common::Rect _tempWalkableRects1[256];
    Common::Rect _tempWalkableRects2[256];
    WalkInfo *_walkInfoPtrs[256];

    WalkArea *_sourceWalkArea, *_destWalkArea;
    Common::Point _sourceWalkAreaPt, _destWalkAreaPt, _finalWalkPt;
    int _currWalkDistance;
    bool _walkReachedDestArea;

    bool _hasSnapshot;
    byte *_snapshot;
    Common::SeekableMemoryWriteStream *_snapshotStream;

    char _easterEggInput[7];

    void updateEvents();
    int getRandom(int max);

    void drawDebugInfo();
    void drawScreen();

    void updateGame();

    bool evalCondition(Conditions &conditions);
    bool evalCameraCondition(Conditions &conditions, int value);
    int evalDialogCondition(Conditions &conditions);
    void evalActionResults(ActionResults &results);

    void updateBackgroundSounds();

    void loadScene(int sceneNum);
    void initScene(bool sounds);
    bool changeScene();
    bool update(int mouseX, int mouseY, uint mouseButtons, Common::KeyCode keyCode);

    void buildDrawList(DrawList &drawList);

    void updateVerbs();
    void updateDialog(bool clicked);
    void updateInventory(bool clicked);
    void updateScene(bool clicked);

    bool performActionCommand(ActionCommand *actionCommand);
    bool processCurrAction();
    void skipCurrAction();

    void updateCommon();

    void updateWalkableRects();
    void startWalkObject(SceneObject *sceneObject);
    void updateWalkObject(SceneObject *sceneObject);
    void walkObject(SceneObject *sceneObject, const Common::Point &destPt, int walkSpeed);
    void turnObject(SceneObject *sceneObject);

    int rectSubtract(const Common::Rect &rect1, const Common::Rect &rect2, Common::Rect *outRects);

    WalkInfo *addWalkInfo(int16 x, int16 y, int delta, int direction, int16 midPtX, int16 midPtY, int walkAreaIndex);
    void initWalkAreas(SceneObject *sceneObject);
    WalkArea *getWalkAreaAtPos(const Common::Point &pt);
    bool canButtheadWalkToDest(const Common::Point &destPt);
    void canWalkToDest(WalkArea *walkArea, int infoCount);
    bool walkTestLineWalkable(const Common::Point &sourcePt, const Common::Point &destPt, WalkInfo *walkInfo);
    void walkFindPath(WalkArea *sourceWalkArea, int infoCount);
    int calcDistance(const Common::Point &pt1, const Common::Point &pt2);
    void walkFoundPath(int count);

    void updateSceneObjectsTurnValue();
    void updateDialogConditions();

    void playSpeech(int soundNum);
    void stopSpeech();

    void playSound(uint soundNum, bool loop = false);
    void stopSound(uint soundNum);
    void stopSounds();

    bool runMinigame(int minigameNum);
    void playVideo(int videoNum);

    void runMainMenu();
    void checkEasterEgg(char key);

    // 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 &description, bool isAutosave = false) override;
    void savegame(const char *filename, const char *description);
    void loadgame(const char *filename);
    bool existsSavegame(int num);
    static Common::String getSavegameFilename(const Common::String &target, int num);
    WARN_UNUSED_RESULT static kReadSaveHeaderError readSaveHeader(Common::SeekableReadStream *in, SaveHeader &header, bool skipThumbnail = true);

    void allocSnapshot();
    void freeSnapshot();
    void saveSnapshot();

    void writeContinueSavegame();

};

} // End of namespace Bbvs

#endif // BBVS_BBVS_H