actor.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 DRAGONS_ACTOR_H
#define DRAGONS_ACTOR_H

#include "common/system.h"

namespace Dragons {
class Actor;
class ActorResourceLoader;
class ActorResource;
struct ActorFrame;

#define DRAGONS_ENGINE_NUM_ACTORS 64

enum ActorFlags {
    ACTOR_FLAG_1 = 1,
    ACTOR_FLAG_2 = 2,
    ACTOR_FLAG_4 = 4,
    ACTOR_FLAG_8 = 8,
    ACTOR_FLAG_10 = 0x10, //actor is walking a path
    ACTOR_FLAG_20 = 0x20,
    ACTOR_FLAG_40 = 0x40,
    ACTOR_FLAG_80 = 0x80,
    ACTOR_FLAG_100 = 0x100,
    ACTOR_FLAG_200 = 0x200,  // Use screen coordinates not map coordinates.
    ACTOR_FLAG_400 = 0x400,  // Actor is hidden
    ACTOR_FLAG_800 = 0x800,
    ACTOR_FLAG_1000 = 0x1000,
    ACTOR_FLAG_2000 = 0x2000,
    ACTOR_FLAG_4000 = 0x4000,
    ACTOR_FLAG_8000 = 0x8000  //Seems turn off semi trans mode when selected.
};

enum ActorFrameFlags {
    ACTOR_FRAME_FLAG_2 = 0x2,
    ACTOR_FRAME_FLAG_10 = 0x10,
    ACTOR_FRAME_FLAG_20 = 0x20
};

class ActorManager {
public:
    typedef Common::Array<Actor> Actors;

private:
    ActorResourceLoader *_actorResourceLoader;
    Actors _actors;
    uint16 _displayOrder[DRAGONS_ENGINE_NUM_ACTORS];
public:
    ActorManager(ActorResourceLoader *actorResourceLoader);

public:
    Actor *loadActor(uint32 resourceId, uint32 sequenceId, int16 x, int16 y);
    Actor *loadActor(uint32 resourceId, uint32 sequenceId, int16 x, int16 y, uint16 priorityLayer);
    Actor *loadActor(uint32 resourceId, uint16 actorId);
    Actor *getActor(uint16 actorId);
    Actor *getActorByDisplayOrder(uint16 position);
    void clearActorFlags(uint16 startingActorId);
    ActorResource *getActorResource(uint32 resourceId);
    void updateActorDisplayOrder();
private:
    Actor *findFreeActor(int16 resourceID);
    void resetDisplayOrder();
};

class Actor {
public:
    uint16 _actorID;
    ActorResource* _actorResource;
    uint16 _actorFileDictionaryIndex;
    int16 _resourceID;
    byte *_seqCodeIp;
    ActorFrame *_frame;
    Graphics::Surface *_surface;
    uint16 _sequenceTimerMaxValue;
    int16 _scale; // scale factor 0x100 is 100%
    uint16 _sequenceTimer;
    uint16 _sequenceID;
    int16 _direction;
    int16 _priorityLayer;
    uint16 _flags;
    int16 _x_pos;
    int16 _y_pos;
    int16 _walkDestX;
    int16 _walkDestY;
    int32 _xShl16;
    int32 _yShl16;
    int32 _walkSlopeX;
    int32 _walkSlopeY;
    uint16 _walkPointsTbl[32];
    int16 _walkPointsIndex;
    int16 _finalWalkDestX;
    int16 _finalWalkDestY;
    uint16 _field_7a;
    int32 _walkSpeed;
    uint16 _frame_flags;
public:

    Actor(uint16 id);
    void init(ActorResource *resource, int16 x, int16 y, uint32 sequenceID);
    void updateSequence(uint16 newSequenceID);
    void resetSequenceIP();
    byte *getSeqIpAtOffset(uint32 offset);
    void loadFrame(uint16 frameOffset);
    void freeFrame();
    void reset_maybe();
    bool startWalk(int16 destX, int16 destY, uint16 flags);
    void walkPath();
    void waitUntilFlag4IsSet();
    void waitUntilFlag8IsSet();
    void waitUntilFlag8And4AreSet();
    void waitUntilFlag8SetThenSet1000();
    void waitUntilFlag8SetThenSet1000AndWaitFor4();
    void waitForWalkToFinish();

    bool waitUntilFlag4IsSetAllowSkip();
    bool actorSetSequenceAndWaitAllowSkip(uint16 newSequenceID);

    void clearFlag(uint32 flag);
    void setFlag(uint32 flag);
    bool isFlagSet(uint32 flag);
    bool isFlagClear(uint32 flag) { return !isFlagSet(flag); }

    byte *getPalette();
    int16 getFrameYOffset();
private:
    void stopWalk();
    uint16 canWalkLine(int16 actor_x, int16 actor_y, int16 target_x, int16 target_y, uint16 walkFlags);
    int16 pathfindingFindClosestPoint(int16 actor_x, int16 actor_y, int16 target_x, int16 target_y, int16 unkType,
                                      bool *pointsInUseTbl);
    int startMoveToPoint(int destX, int destY);
};

} // End of namespace Dragons

#endif //DRAGONS_ACTOR_H