axmol/core/renderer/GroupCommand.h

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
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 all copies or substantial portions of the Software.

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#ifndef _AX_GROUPCOMMAND_H_
#define _AX_GROUPCOMMAND_H_

#include <vector>
#include <unordered_map>

#include "base/Object.h"
#include "renderer/RenderCommand.h"

/**
 * @addtogroup renderer
 * @{
 */

NS_AX_BEGIN

// Used for internal
class GroupCommandManager : public Object
{
public:
    int getGroupID();
    void releaseGroupID(int groupID);

protected:
    friend class Renderer;
    GroupCommandManager();
    ~GroupCommandManager();
    bool init();
    std::unordered_map<int, bool> _groupMapping;
    std::vector<int> _unusedIDs;
};

/**
 GroupCommand is used to group several command together, and more, it can be nested.
 So it is used to generate the hierarchy for the rendcommands. Every group command will be assigned by a group ID.
 */
class AX_DLL GroupCommand : public RenderCommand
{
public:
    /**@{
     Constructor and Destructor.
     */
    GroupCommand();
    ~GroupCommand();
    /**@}*/

    /**Init function for group command*/
    void init(float globalOrder);

    /**called by renderer, get the group ID.*/
    int getRenderQueueID() const { return _renderQueueID; }

    /**
     * @brief Reset the command state for reuse
     * 
     */
    void reset();

protected:
    int _renderQueueID;
};

NS_AX_END

/**
 end of support group
 @}
 */
#endif  //_AX_GROUPCOMMAND_H_