RE_ContextSpecificTable.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        RE_ContextSpecificTable.h ( RE Library, C++)
 *
 * COMMENTS:
 *      Contains context-specific objects, creating them as needed for new
 *      GL contexts.
 */
#ifndef RE_ContextSpecificTable_h
#define RE_ContextSpecificTable_h

#include "RE_API.h"
#include "RE_ContextSpecificObject.h"
#include "RE_Render.h"
#include "RE_Server.h"

#include <UT/UT_NonCopyable.h>
#include <UT/UT_ValArray.h>

template <class CObj>
class RE_ContextSpecificTable
{
public:
    RE_ContextSpecificTable() {} 
    ~RE_ContextSpecificTable()
        {
            for(int i=0; i<myObjects.entries(); i++)
                if(myObjects(i))
                {
                    // avoid an attempt to clear the GL object, since deleting
                    // the table implies we're exiting and contexts are not
                    // likely to be valid. Use clear() if you need to free
                    // the GL objects themselves.
                    if(RE_Server::isAppExiting())
                        myObjects(i)->clearContext();
                    delete myObjects(i);
                }
        }
    UT_NON_COPYABLE(RE_ContextSpecificTable)

    CObj *get(RE_Render *r)
        {
            int id = r->getContextID();
            RE_ContextSpecificObject *obj = myObjects.forcedRef(id);
            if(!obj)
            {
                obj = myObjects(id) = new CObj;
                obj->init(r);
            }

            return static_cast<CObj *>(obj);
        }
    CObj *peek(RE_Render *r)
        {
            int id = r->getContextID();
            if(id < myObjects.entries())
               return static_cast<CObj *>(myObjects(id));
            return nullptr;
        }
    
    void  free(RE_Render *r)
        {
            int id = r->getContextID();

            if(id >= myObjects.entries())
                return;
    
            delete myObjects(id);
            myObjects(id) = nullptr;
        }

    void  clear()
        {
            for(int i=0; i<myObjects.entries(); i++)
            {
                delete myObjects(i);
                myObjects(i) = nullptr;
            }
            myObjects.entries(0);
        }

    /// Returns the amount of main memory (NOT graphics memory!)
    /// owned by this RE_ContextSpecificTable.
    int64 getMemoryUsage(bool inclusive) const
    {
        int64 mem = inclusive ? sizeof(*this) : 0;
        mem += myObjects.getMemoryUsage(false);
        return mem;
    }

private:
    UT_ValArray<RE_ContextSpecificObject *> myObjects;

    friend class RE_OGLRender;
};

#endif