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

  Program:   Visualization Toolkit
  Module:    vtkOpenGLRenderer.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkOpenGLRenderer - OpenGL renderer
// .SECTION Description
// vtkOpenGLRenderer is a concrete implementation of the abstract class
// vtkRenderer. vtkOpenGLRenderer interfaces to the OpenGL graphics library.

#ifndef __vtkOpenGLRenderer_h
#define __vtkOpenGLRenderer_h

#include <stdlib.h>
#include "vtkRenderer.h"

class VTK_EXPORT vtkOpenGLRenderer : public vtkRenderer
{
protected:
  int NumberOfLightsBound;

public:
  static vtkOpenGLRenderer *New();
  vtkTypeMacro(vtkOpenGLRenderer,vtkRenderer);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Concrete open gl render method.
  void DeviceRender(void); 

  // Description:
  // Internal method temporarily removes lights before reloading them
  // into graphics pipeline.
  void ClearLights(void);

  void Clear(void);

  // Description:
  // Ask lights to load themselves into graphics pipeline.
  int UpdateLights(void);
  
protected:
  vtkOpenGLRenderer();
  ~vtkOpenGLRenderer();
  vtkOpenGLRenderer(const vtkOpenGLRenderer&) {};
  void operator=(const vtkOpenGLRenderer&) {};

  //BTX
  // Picking functions to be implemented by sub-classes
  virtual void DevicePickRender();
  virtual void StartPick(unsigned int pickFromSize);
  virtual void SetPickId(unsigned int pickID);
  virtual void DonePick();
  virtual unsigned int GetPickedID();
  virtual float GetPickedZ();
  // Ivars used in picking
  class vtkGLPickInfo* PickInfo;
  //ETX
  float PickedZ;
};

#endif
