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

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


Copyright (c) 1993-1996 Ken Martin, Will Schroeder, Bill Lorensen.

This software is copyrighted by Ken Martin, Will Schroeder and Bill Lorensen.
The following terms apply to all files associated with the software unless
explicitly disclaimed in individual files. This copyright specifically does
not apply to the related textbook "The Visualization Toolkit" ISBN
013199837-4 published by Prentice Hall which is covered by its own copyright.

The authors hereby grant permission to use, copy, and distribute this
software and its documentation for any purpose, provided that existing
copyright notices are retained in all copies and that this notice is included
verbatim in any distributions. Additionally, the authors grant permission to
modify this software and its documentation for any purpose, provided that
such modifications are not distributed without the explicit consent of the
authors and that existing copyright notices are retained in all copies. Some
of the algorithms implemented by this software are patented, observe all
applicable patent law.

IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF,
EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN
"AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.


=========================================================================*/
// .NAME vtkRIBExporter - export a scene into RenderMan RIB format.
// .SECTION Description
// vtkRIBExporter is a concrete subclass of vtkExporter that writes a
// Renderman .RIB files. The input specifies a vtkRenderWindow. All
// visible actors and lights will be included in the rib file. The
// following file naming conventions apply:
//   rib file - FilePrefix.rib
//   image file created by RenderMan - FilePrefix.tif
//   texture files - TexturePrefix_0xADDR_MTIME.tif
// This object does NOT generate an image file. The user must run either
// RenderMan or a RenderMan emulator like Blue Moon Ray Tracer (BMRT).
// vtk properties are convert to Renderman shaders as follows:
//   Normal property, no texture map - plastic.sl
//   Normal property with texture map - txtplastic.sl
// These two shaders must be compiled by the rendering package being
// used.  vtkRIBExporter also supports custom shaders. The shaders are
// written using the Renderman Shading Language. See "The Renderman
// Companion", ISBN 0-201-50868, 1989 for details on writing shaders.
// vtkRIBProperty specifies the declarations and parameter settings for
// custom shaders.
// Tcl Example: generate a rib file for the current rendering.
// vtkRIBExporter myRIB
//   myRIB SetInput $renWin
//   myRIB SetFIlePrefix mine
//   myRIB Write
// This will create a file mine.rib. After running this file through
// a Renderman renderer a file mine.tif will contain the rendered image.
//
// .SECTION See Also
// vtkExporter vtkRIBProperty


#ifndef __vtkRIBExporter_h
#define __vtkRIBExporter_h

#include <stdio.h>
#include "vtkExporter.h"
#include "vtkRenderer.h"
#include "vtkTexture.h"
#include "vtkPolyData.h"

class VTK_EXPORT vtkRIBExporter : public vtkExporter
{
public:
  vtkRIBExporter();
  ~vtkRIBExporter();
  char *GetClassName() {return "vtkRIBExporter";};
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description
  // Specify the size of the image for RenderMan. If none is specified, the
  // size of the render window will be used.
  vtkSetVector2Macro(Size,int);
  vtkGetVectorMacro(Size,int,2);

  // Description:
  // Specify the prefix of the files to write out. The resulting filenames
  // will have .RIB appended to them.
  vtkSetStringMacro(FilePrefix);
  vtkGetStringMacro(FilePrefix);

  // Description:
  // Specify the prefix of any generated texture files.
  vtkSetStringMacro(TexturePrefix);
  vtkGetStringMacro(TexturePrefix);

  // Description:
  // Set/Get the background flag. Default is 0 (off).
  // If set, the rib file will contain an
  // image shader that will use the renderer window's background
  // color. Normally, RenderMan does generate backgrounds. Backgrounds are
  // composited into the scene with the tiffcomp program that comes with
  // Pixar's RenderMan Toolkit.  In fact, Pixar's Renderman will accept an
  // image shader but only sets the alpha of the background. Images created
  // this way will still have a black background but contain an alpha of 1
  // at all pixels and CANNOT be subsequently composited with other images
  // using tiffcomp.  However, other RenderMan compliant renderers like
  // Blue Moon Ray Tracing (BMRT) do allow image shaders and properly set
  // the background color. If this sounds too confusing, use the following
  // rules: If you are using Pixar's Renderman, leave the Background
  // off. Otherwise, try setting BackGroundOn and see if you get the
  // desired results.
  vtkSetMacro(Background,int);
  vtkGetMacro(Background,int);
  vtkBooleanMacro(Background,int);

protected:
  int Background;
  int Size[2];
  // Description:
  // Write the RIB header.
  void WriteHeader (vtkRenderer *aRen);
  void WriteTrailer ();
  void WriteTexture (vtkTexture *aTexture);
  void WriteViewport (vtkRenderer *aRenderer, int size[2]);
  void WriteCamera (vtkCamera *aCamera);
  void WriteLight (vtkLight *aLight, int count);
  void WriteProperty (vtkProperty *aProperty, vtkTexture *aTexture);
  void WritePolygons (vtkPolyData *pd, vtkColorScalars *colors, vtkProperty *aProperty);
  void WriteStrips (vtkPolyData *pd, vtkColorScalars *colors, vtkProperty *aProperty);

  void WriteData();
  void WriteActor(vtkActor *anActor);
  char *GetTextureName (vtkTexture *aTexture);
  char *GetTIFFName (vtkTexture *aTexture);
  char *FilePrefix;
  FILE *FilePtr;
  char *TexturePrefix;
};

#endif

