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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkOpenGLTexture.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkOpenGLTexture_h
#define vtkOpenGLTexture_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkTexture.h"
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.

class vtkRenderWindow;
class vtkTextureObject;

class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLTexture : public vtkTexture
{
public:
  static vtkOpenGLTexture *New();
  vtkTypeMacro(vtkOpenGLTexture, vtkTexture);
  virtual void PrintSelf(ostream& os, vtkIndent indent);

  virtual void Render(vtkRenderer* ren);

  void Load(vtkRenderer*);

  // Descsription:
  // Clean up after the rendering is complete.
  virtual void PostRender(vtkRenderer*);

  void ReleaseGraphicsResources(vtkWindow*);


  vtkGetMacro(Index, long);

  void CopyTexImage(int x, int y, int width, int height);


  vtkGetMacro(IsDepthTexture,int);
  vtkSetMacro(IsDepthTexture,int);


  vtkGetMacro(TextureType,int);
  vtkSetMacro(TextureType,int);

  vtkGetObjectMacro(TextureObject, vtkTextureObject);
  void SetTextureObject(vtkTextureObject *);

  virtual int GetTextureUnit();

  virtual int IsTranslucent();

protected:
  vtkOpenGLTexture();
  ~vtkOpenGLTexture();

  vtkTimeStamp   LoadTime;
  unsigned int Index; // actually GLuint
  vtkWeakPointer<vtkRenderWindow> RenderWindow;   // RenderWindow used for previous render

  bool ExternalTextureObject;
  vtkTextureObject *TextureObject;

  int IsDepthTexture;
  int TextureType;

  // used when the texture exceeds the GL limit
  unsigned char *ResampleToPowerOfTwo(int &xsize, int &ysize,
                                      unsigned char *dptr, int bpp);


private:
  vtkOpenGLTexture(const vtkOpenGLTexture&);  // Not implemented.
  void operator=(const vtkOpenGLTexture&);  // Not implemented.
};

#endif