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 SCUMM_SCRIPT_H
#define SCUMM_SCRIPT_H

#include "common/func.h"

namespace Scumm {

typedef Common::Functor0<void> Opcode;

struct OpcodeEntry : Common::NonCopyable {
    Opcode *proc;
#ifndef REDUCE_MEMORY_USAGE
    const char *desc;
#endif

#ifndef REDUCE_MEMORY_USAGE
    OpcodeEntry() : proc(0), desc(0) {}
#else
    OpcodeEntry() : proc(0) {}
#endif
    ~OpcodeEntry() {
        setProc(0, 0);
    }

    void setProc(Opcode *p, const char *d) {
        if (proc != p) {
            delete proc;
            proc = p;
        }
#ifndef REDUCE_MEMORY_USAGE
        desc = d;
#endif
    }
};


// This is to help devices with small memory (PDA, smartphones, ...)
// to save abit of memory used by opcode names in the Scumm engine.
#ifndef REDUCE_MEMORY_USAGE
#   define _OPCODE(ver, x)  setProc(new Common::Functor0Mem<void, ver>(this, &ver::x), #x)
#else
#   define _OPCODE(ver, x)  setProc(new Common::Functor0Mem<void, ver>(this, &ver::x), "")
#endif

enum {
    NUM_SCRIPT_SLOT = 80,
    NUM_SCRIPT_LOCAL = 25
};

/* Script status type (slot.status) */
enum {
    ssDead = 0,
    ssPaused = 1,
    ssRunning = 2
};

struct ScriptSlot {
    uint32 offs;
    int32 delay;
    uint16 number;
    uint16 delayFrameCount;
    bool freezeResistant, recursive;
    bool didexec;
    byte status;
    byte where;
    byte freezeCount;
    byte cutsceneOverride;
    byte cycle;
};

struct NestedScript {
    uint16 number;
    uint8 where;
    uint8 slot;
};

enum {
    kMaxCutsceneNum = 5,

    kMaxScriptNesting = 15
};

struct VirtualMachineState {
    uint32 cutScenePtr[kMaxCutsceneNum];
    byte cutSceneScript[kMaxCutsceneNum];
    int16 cutSceneData[kMaxCutsceneNum];
    int16 cutSceneScriptIndex;
    byte cutSceneStackPointer;
    ScriptSlot slot[NUM_SCRIPT_SLOT];
    // Why does localvar have space for one extra local variable?
    int32 localvar[NUM_SCRIPT_SLOT][NUM_SCRIPT_LOCAL + 1];

    NestedScript nest[kMaxScriptNesting];
    byte numNestedScripts;
};

} // End of namespace Scumm

#endif