DtGlBuffer.h

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/******************************************************************************
** Copyright (c) 2018 VT-MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/

#pragma once
#include <vrvGraphicsUtils/vrvGraphicsUtils.h>
#include <vrvGraphicsUtils/DtBufferType.h>
#include <vrvGraphicsUtils/DtUsage.h>
#include <vrvGraphicsUtils/DtCpuAccess.h>
#include <GL/glew.h>
#include <string>

namespace makVrv
{
   class DT_DLL_VRVGRAPHICSUTILS DtGlBuffer
   {
   public:
      DtGlBuffer(const char * name, DtBufferType type, int sizeInBytes, DtUsage usage, DtCpuAccess accessType, bool hasStagingBuffer, const GLvoid* data = 0);

      virtual ~DtGlBuffer();

      virtual void resizeBuffer(int sizeInBytes, const GLvoid* data);
      

      void bind();
      void unbind();




      void bind(GLenum type);
      void unbind(GLenum type);

      int sizeInBytes(void) const;

      GLenum type(void) const;






      GLubyte* findStagingBuffer(void) const;

      void syncToGpu(GLuint offset, GLuint sizeInBytes);

      void syncToGpu();
      
      void bufferSubData(GLuint offset, GLuint sizeInBytes, const GLvoid *data);

      GLuint handle(void) const;

      void tearDown(void ) const;

      static bool resizeBufferIfNecessary(DtGlBuffer*& buffer, const char * name, 
         DtBufferType bufferType, int sizeInBytesNeeded, DtUsage usage, DtCpuAccess accessType, bool hasStaging, const void* data);

   protected:
      std::string myName;
      mutable GLuint myHandle;
      GLenum myType;
      int mySizeInBytes;

      GLubyte* myStagingBufffer;
      bool myHasStagingBuffer;
      DtUsage myUsage;
      DtCpuAccess myAccessType;
   };
}