DtGlTexture.h

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

#pragma once

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

#include <GL/glew.h>

namespace makVrv {

   class Device;

   enum TextureType
   {
      // 1D texture, used in combination with 1D texture coordinates
      TEX_TYPE_1D = 1,
      // 2D texture, used in combination with 2D texture coordinates (default)
      TEX_TYPE_2D = 2,
      // 3D volume texture, used in combination with 3D texture coordinates
      TEX_TYPE_3D = 3,
      // 3D cube map, used in combination with 3D texture coordinates
      TEX_TYPE_CUBE_MAP = 4,
      // 2D texture array
      TEX_TYPE_2D_ARRAY = 5
   };

   class DT_DLL_VRVGRAPHICSUTILS DtGlTexture
   {
   public:
      DtGlTexture(const char * name, const byte* pData, size_t byteLength);

      DtGlTexture(const char * name, TextureType type
         , size_t width, size_t height, size_t depth
         , DtDataFormat format
         , const DtUsage usage, const DtCpuAccess cpuAccess, const int bindFlags
         , void* pData);

      DtGlTexture(TextureType type
         , size_t externalRefTexID
         , size_t width = 1, size_t height = 1, size_t depth = 1);

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

      virtual ~DtGlTexture();

      DtDataFormat format(void) const;

      size_t sizeInBytes(void) const;

      size_t width(void) const;
      size_t height(void) const;
      size_t depth(void) const;

      void copyData(void* pData);

      void copyData(void* pData, size_t width, size_t height, size_t depth);

      void bindTexture(void);

      void setExternalTextureReference(size_t externalRefTexID);

      size_t textureReference() const;

      void releaseGLObjects() const;

   private:
      std::string myName;
      mutable GLuint myTextureID;
      TextureType myTextureType;

      bool is1D(void) const;
      bool is2D(void) const;
      bool is3D(void) const;

      size_t myWidth;
      size_t myHeight;
      size_t myDepth;
      DtDataFormat myFormat;
      bool myExternalTexRef;
   };
}