script.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 ALCACHOFA_SCRIPT_H
#define ALCACHOFA_SCRIPT_H

#include "alcachofa/common.h"

#include "common/hashmap.h"
#include "common/span.h"
#include "common/stream.h"
#include "common/system.h"

namespace Alcachofa {

class Process;

// the ScriptOp and ScriptKernelTask enums represent the *implemented* order
// the specific Game instance maps the version-specific op codes to our order
// keep the order in sync with ScriptOpNames/KernelCallNames in script-debug.h

enum class ScriptOp {
    Nop,
    Dup,
    PushAddr,
    PushDynAddr,
    PushValue,
    Deref,
    Pop1,
    PopN,
    Store,
    LoadString,
    ScriptCall,
    KernelCall,
    JumpIfFalse,
    JumpIfTrue,
    Jump,
    Negate,
    BooleanNot,
    Mul,
    Add,
    Sub,
    Less,
    Greater,
    LessEquals,
    GreaterEquals,
    Equals,
    NotEquals,
    BitAnd,
    BitOr,
    ReturnValue,
    ReturnVoid,
    Crash
};

enum class ScriptKernelTask {
    Nop = 0,
    PlayVideo,
    PlaySound,
    PlayMusic,
    StopMusic,
    WaitForMusicToEnd,
    ShowCenterBottomText,
    StopAndTurn,
    StopAndTurnMe,
    ChangeCharacter,
    SayText,
    SayTextV2, // TODO: Reverse engineer this variant
    Go,
    Put,
    ChangeCharacterRoom,
    KillProcesses,
    LerpCharacterLodBias,
    On,
    Off,
    Pickup,
    CharacterPickup,
    Drop,
    CharacterDrop,
    Delay,
    HadNoMousePressFor,
    Fork,
    Animate,
    AnimateCharacter,
    AnimateTalking,
    ChangeRoom,
    ToggleRoomFloor,
    SetDialogLineReturn,
    DialogMenu,
    ClearInventory,
    FadeType0,
    FadeType1,
    LerpWorldLodBias,
    FadeType2,
    SetActiveTextureSet,
    SetMaxCamSpeedFactor,
    WaitCamStopping,
    CamFollow,
    CamShake,
    LerpCamXY,
    LerpCamZ,
    LerpCamScale,
    LerpCamToObjectWithScale,
    LerpCamToObjectResettingZ,
    LerpCamRotation,
    LerpOrSetCam, // only V1 and V2
    FadeIn,
    FadeOut,
    FadeIn2,
    FadeOut2,
    LerpCamXYZ,
    LerpCamToObjectKeepingZ,
    Disguise
};

enum class ScriptFlags {
    None = 0,
    AllowMissing = (1 << 0),
    IsBackground = (1 << 1)
};
inline ScriptFlags operator | (ScriptFlags a, ScriptFlags b) {
    return (ScriptFlags)(((uint)a) | ((uint)b));
}
inline bool operator & (ScriptFlags a, ScriptFlags b) {
    return ((uint)a) & ((uint)b);
}

struct ScriptInstruction {
    ScriptInstruction(Common::ReadStream &stream);

    int32 _op; 
    int32 _arg;
};

class Script {
public:
    Script();

    void syncGame(Common::Serializer &s);
    int32 variable(const char *name) const;
    int32 &variable(const char *name);
    Process *createProcess(
        MainCharacterKind character,
        const Common::String &procedure,
        ScriptFlags flags = ScriptFlags::None);
    Process *createProcess(
        MainCharacterKind character,
        const Common::String &behavior,
        const Common::String &action,
        ScriptFlags flags = ScriptFlags::None);
    bool hasProcedure(const Common::String &behavior, const Common::String &action) const;
    bool hasProcedure(const Common::String &procedure) const;
    Common::String procedureAt(uint32 pc) const;

    using VariableNameIterator = Common::HashMap<Common::String, uint32>::const_iterator;
    inline VariableNameIterator beginVariables() const { return _variableNames.begin(); }
    inline VariableNameIterator endVariables() const { return _variableNames.end(); }
    inline bool hasVariable(const char *name) const { return _variableNames.contains(name); }

    void setScriptTimer(bool reset);
    void fixNestedMenuPop(uint32 pc);
private:
    friend struct ScriptTask;
    friend struct ScriptTimerTask;
    Common::HashMap<Common::String, uint32> _variableNames;
    Common::HashMap<Common::String, uint32> _procedures;
    Common::Array<ScriptInstruction> _instructions;
    Common::Array<int32> _variables;
    Common::SpanOwner<Common::Span<char>> _strings;
    uint32 _scriptTimer = 0;
};

}

#endif // ALCACHOFA_SCRIPT_H