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

  Program:   Visualization Toolkit
  Module:    vtkOpenGLImageSliceMapper.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 vtkOpenGLImageSliceMapper_h
#define vtkOpenGLImageSliceMapper_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkImageSliceMapper.h"

class vtkRenderWindow;
class vtkOpenGLRenderWindow;
class vtkActor;

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

  void Render(vtkRenderer *ren, vtkImageSlice *prop);

  void ReleaseGraphicsResources(vtkWindow *);

protected:
  vtkOpenGLImageSliceMapper();
  ~vtkOpenGLImageSliceMapper();


  void RecursiveRenderTexturedPolygon(
    vtkRenderer *ren, vtkImageProperty *property,
    vtkImageData *image, int extent[6], bool recursive);


  void RenderTexturedPolygon(
    vtkRenderer *ren, vtkImageProperty *property,
    vtkImageData *image, int extent[6], bool recursive);

  void RenderPolygon(vtkActor *actor, vtkPoints *points, const int extent[6], vtkRenderer *ren);


  void RenderBackground(
    vtkActor *actor, vtkPoints *points, const int extent[6], vtkRenderer *ren);

  void BindFragmentProgram(vtkRenderer *ren, vtkImageProperty *property);

  vtkStdString BuildFragmentProgram(vtkImageProperty *property);


  void ComputeTextureSize(
    const int extent[6], int &xdim, int &ydim,
    int imageSize[2], int textureSize[2]);

  bool TextureSizeOK(const int size[2]);

  void CheckOpenGLCapabilities(vtkOpenGLRenderWindow *renWin);

  long FragmentShaderIndex; // OpenGL ID for fragment shader
  vtkRenderWindow *RenderWindow; // RenderWindow used for previous render
  int TextureSize[2];
  int TextureBytesPerPixel;
  int LastOrientation;
  int LastSliceNumber;

  vtkActor *PolyDataActor;
  vtkActor *BackingPolyDataActor;
  vtkActor *BackgroundPolyDataActor;

  vtkTimeStamp LoadTime;
  int LoadCount;

  bool UsePowerOfTwoTextures;
  bool UseClampToEdge;
  bool UseFragmentProgram;

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

#endif