memory.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 LASTEXPRESS_MEMORY_H
#define LASTEXPRESS_MEMORY_H

#include "common/scummsys.h"

#include "lastexpress/lastexpress.h"

namespace LastExpress {

class LastExpressEngine;

struct MemPage {
    void *memPagePtr;
    uint32 memPageSize;
    int32 character;
    char pageName[81];
    bool allocatedFlag;

    MemPage() {
        memPagePtr = nullptr;
        memPageSize = 0;
        character = 0;
        memset(pageName, 0, sizeof(pageName));
        allocatedFlag = false;
    }

    void copyFrom(MemPage other) {
        memPagePtr = other.memPagePtr;
        memPageSize = other.memPageSize;
        character = other.character;
        memcpy(pageName, other.pageName, sizeof(pageName));
        allocatedFlag = other.allocatedFlag;
    }
};

enum MemoryFlags {
    kMemoryFlagInit    = 0x1,
    kMemoryFlagFXFree  = 0x2,
    kMemoryFlagSeqFree = 0x4,
};

class MemoryManager {
public:
    MemoryManager(LastExpressEngine *engine);
    ~MemoryManager() {}

    void initMem();
    void *allocMem(uint32 size, const char *name, int character);
    void freeMem(void *data);
    void releaseMemory();
    void freeFX();
    void lockFX();
    void lockSeqMem(uint32 size);
    void freeSeqMem();
    Seq *copySeq(Seq *sequenceToCopy);

private:
    LastExpressEngine *_engine = nullptr;

    int32 _nisSeqMemFlag = 0;
    MemPage _memoryPages[128];
    int _numAllocatedMemPages = 1;
    int32 _nisSeqMemAvailForLocking = 0;
};

} // End of namespace LastExpress

#endif // LASTEXPRESS_MEMORY_H