DtBufferObjectApplyAttribute.h

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/****************************************************************************** 
** Copyright (c) 2022 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <osg/StateAttribute>

#include <unordered_map>
#include <map>

namespace osg
{
   class State;
}

namespace makVrv
{
   class DtGlBuffer;

   class DtBufferObjectApplyAttribute;

   class DtBufferObjectApplyAttributeCallback
   {
   public:
      virtual void callback(const DtBufferObjectApplyAttribute* attribute, const osg::State& state) = 0;
   };

   class DT_DLL_VRVOSG DtBufferObjectApplyAttribute : public osg::StateAttribute
   {
   public:
      DtBufferObjectApplyAttribute();

      DtBufferObjectApplyAttribute(const DtBufferObjectApplyAttribute& copy, const osg::CopyOp& copyOp =
         osg::CopyOp::SHALLOW_COPY);
   
      virtual ~DtBufferObjectApplyAttribute();
   
   private:
      DtBufferObjectApplyAttribute& operator=(const DtBufferObjectApplyAttribute&) = delete;
   
   public:
      virtual void addBufferObject(DtGlBuffer* ubo, GLuint bindingPointIndex);

      virtual void removeBufferObject(DtGlBuffer* ubo);

      virtual void apply(osg::State& state) const;

      virtual int compare(const StateAttribute& sa) const = 0;

      virtual void releaseGLObjects(osg::State* state/* =0 */) const;

      virtual void setCallback(DtBufferObjectApplyAttributeCallback* callback);

   protected:
      typedef std::map<GLuint, DtGlBuffer*> BufferMap;
      BufferMap myBufferMap;

      DtBufferObjectApplyAttributeCallback* myCallback = nullptr;

      bool myConsecutive = false;
      mutable std::vector<unsigned int> myConsecutiveHandlesScratch;
   };
}