DtGLTexture.h

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/****************************************************************************** 
** Copyright (c) 2014 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 

#pragma once

#include "DtGraphicsUtilsPreReqs.h"
#include "DtCommonTypes.h"
#include "DtDataFormat.h"
#include "DtUsage.h"
#include "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(Device* pDevice, const byte* pData, size_t byteLength);

   DtGLTexture(Device* pDevice
      , 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(Device* pDevice
      , TextureType type
     , size_t externalRefTexID
      , size_t width = 1, size_t height = 1, size_t depth = 1);
   
   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;

private:

   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;
};
}