RE_PerContextData.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_PerContextData.h ( RE Library, C++)
 *
 * COMMENTS:
 *      Data that is kept with a RE_OGLContext, rather than RE_Render.
 *      RE_Renders are continually created and destroyed, while RE_OGLContexts
 *      are not.
 */
#ifndef RE_PerContextData_h
#define RE_PerContextData_h

#include <UT/UT_Array.h>

#include "RE_API.h"
#include "RE_Font.h"

#include <utility>

class RE_BufferGroup;
class RE_Render;
class RE_OGLVertexArrayList;

class RE_API RE_PerContextData
{
public:
    static RE_PerContextData *getDataForContext(RE_OGLContext context);
    static void               clearContextData(RE_OGLContext context);

    // bucketed buffer groups for font rendering.
    RE_FontBuffers *fetchFontBufferFromPool(RE_Render *r, int size);
    void            returnFontBufferToPool(RE_FontBuffers *buf);

    // buffer groups for immediate mode emuluation.
    RE_BufferGroup *getBufferGroup(RE_Render *r, int size);

    void            initBuffers(RE_Render *r);

private:
    void            initBufferGroupRing();
    RE_BufferGroup *getNextBufferGroup(RE_Render *r);
    RE_BufferGroup *getLargeBufferGroup(RE_Render *r, int size);

    RE_BufferGroup *myBufferGroups;
    RE_BufferGroup *myCurrentBufferGroup;
    RE_BufferGroup *myLargeBufferGroups;
    int             myLargeBufferSerial;

    bool            myInitialized;

    UT_Array<std::pair<RE_FontBuffers *, RE_FontBuffers *>>
                    myFontBufferBuckets;

    RE_PerContextData();
    ~RE_PerContextData();
};


class RE_BufferGroup
{
public:
    RE_BufferGroup()
        : myElemSize(0),
          mySerial(0),
          myP(nullptr),
          myC(nullptr),
          myImgUV(nullptr),
          myPatUV(nullptr),
          myPSize(nullptr),
          myElemList(nullptr),
          myVAO(nullptr),
          myNext(nullptr)               {}

    ~RE_BufferGroup();

    void init(RE_Render *r, const int size);

    RE_VertexArray      *myP;
    RE_VertexArray      *myC;
    RE_VertexArray      *myPatUV;
    RE_VertexArray      *myImgUV;
    RE_VertexArray      *myPSize;
    
    RE_VertexArray      *myElemList;
    RE_OGLVertexArrayList *myVAO;

    int                  myElemSize;
    int                  mySerial;
   
    RE_BufferGroup      *myNext;
};

#endif