clients.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 MEDIASTATION_CLIENTS_H
#define MEDIASTATION_CLIENTS_H

#include "mediastation/datafile.h"

namespace MediaStation {

class ParameterClient {
public:
    ParameterClient() {};
    virtual ~ParameterClient() {};

    virtual bool attemptToReadFromStream(Chunk &chunk, uint sectionType) = 0;
};

enum DeviceOwnerSectionType {
    kDeviceOwnerAllowMultipleSounds = 0x35,
    kDeviceOwnerAllowMultipleStreams = 0x36,
};

class DeviceOwner : public ParameterClient {
public:
    virtual bool attemptToReadFromStream(Chunk &chunk, uint sectionType) override;

    bool _allowMultipleSounds = false;
    bool _allowMultipleStreams = false;
};

enum DocumentSectionType {
    kDocumentContextLoadComplete = 0x10,
    kDocumentStartupInformation = 0x2e,
    kDocumentEntryScreen = 0x2f,
};

class Document : public ParameterClient {
public:
    virtual bool attemptToReadFromStream(Chunk &chunk, uint sectionType) override;
    void readStartupInformation(Chunk &chunk);
    void readContextLoadComplete(Chunk &chunk);

    void beginTitle(uint overriddenEntryPointScreenId = 0);
    void startContextLoad(uint contextId);
    bool isContextLoadInProgress(uint contextId);
    void branchToScreen();
    void scheduleScreenBranch(uint screenActorId);
    void scheduleContextRelease(uint contextId);

    void streamDidClose(uint streamId);
    void streamDidFinish(uint streamId);
    // These implementations are left empty because they are empty in the original,
    // but they are kept because they are technically still defined in the original.
    void streamDidOpen(uint streamId) {};
    void streamWillRead(uint streamId) {};

    void process();
    uint contextIdForScreenActorId(uint screenActorId);

private:
    uint _currentScreenActorId = 0;
    StreamFeed *_currentStreamFeed = nullptr;
    Common::Array<uint> _requestedContextReleaseId;
    Common::Array<uint> _contextLoadQueue;
    uint _requestedScreenBranchId = 0;
    bool _entryPointScreenIdWasOverridden = false;
    uint _entryPointScreenId = 0;
    uint _entryPointStreamId = 0;
    uint _loadingContextId = 0;
    uint _loadingScreenActorId = 0;

    void contextLoadDidComplete();
    void screenLoadDidComplete();
    void startFeed(uint streamId);
    // This is named stopFeed in the original, but it is a bit of a misnomer
    // because it also closes the stream feed. In the lower-level stream feed manager
    // and stream feeds themselves, stopping the stream feed and closing it is
    // two separate operations.
    void stopFeed();
    void blowAwayCurrentScreen();
    void preloadParentContexts(uint contextId);
    void addToContextLoadQueue(uint contextId);
    bool isContextLoadQueued(uint contextId);
    void checkQueuedContextLoads();
};

} // End of namespace MediaStation

#endif