DtGlTextureBufferObject.h

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/******************************************************************************
** Copyright (c) 2017 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/

#pragma once

#include <vrvGraphicsUtils/vrvGraphicsUtils.h>
#include <vrvGraphicsUtils/DtDataFormat.h>
#include <vrvGraphicsUtils/DtCommonTypes.h>
#include <vrvGraphicsUtils/DtUsage.h>
#include <vrvGraphicsUtils/DtCpuAccess.h>

typedef unsigned int GLuint;
typedef unsigned int GLenum;


namespace makVrv {

   class Device;

   class DT_DLL_VRVGRAPHICSUTILS DtGlTextureBufferObject
   {
   public:
      //ONLY SAFE IN THE DRAW THREAD
      DtGlTextureBufferObject( const char * name, size_t sizeInBytes
         , DtDataFormat format
         , DtUsage usage
         , DtCpuAccess cpuAccess);

      // doesn't allocate instantly
      DtGlTextureBufferObject(
         const char * name,
         DtDataFormat format
         , DtUsage usage
         , DtCpuAccess cpuAccess
         );

      void setName(const char * name) { myName = name; }

      virtual ~DtGlTextureBufferObject();

      size_t sizeInBytes(void) const;

      void copyData(void* pData, size_t sizeInBytes, size_t offsetInBytes = 0);

      void copyAndOrphanStreamedData(void* pData, size_t sizeInBytes);

      void copyDataMapped(void* pData, size_t sizeInBytes, size_t offsetInBytes = 0);

      DtDataFormat format(void) const { return myFormat; }

      void bindTexture(void);
      void bindTBO(void);
      void* mapTBO(void);
      void unmapTBO(void);

      void resize(size_t sizeInBytes);
   
      void tearDown(void);
      void setUseBufferedData(bool val) { myUseBufferData = val; }
      bool getUseBufferedData() {  return myUseBufferData; }

   private:
      std::string myName;
      GLuint myTextureBufferObjectID;
      GLuint myTextureID;
      size_t mySizeInBytes;

      DtUsage myUsage;
      DtCpuAccess myCPUAccess;
      DtDataFormat myFormat;
      GLenum myGLUsage;
      GLenum myGLInternalFormat;
      
      bool myUseBufferData;
      char * myBufferData;

      void reInitialize(const byte* pData);
   };
}