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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkMapper.h,v $
  Language:  C++
  Date:      $Date: 2001/11/02 16:43:15 $
  Version:   $Revision: 1.77 $


Copyright (c) 1993-2001 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 AUTHORS 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 vtkMapper - abstract class specifies interface to map data to graphics primitives
// .SECTION Description
// vtkMapper is an abstract class to specify interface between data and 
// graphics primitives. Subclasses of vtkMapper map data through a 
// lookuptable and control the creation of rendering primitives that
// interface to the graphics library. The mapping can be controlled by 
// supplying a lookup table and specifying a scalar range to map data
// through.
//
// There are several important control mechanisms affecting the behavior of
// this object. The ScalarVisibility flag controls whether scalar data (if
// any) controls the color of the associated actor(s) that refer to the
// mapper. The ScalarMode ivar is used to determine whether scalar point data
// or cell data is used to color the object. By default, point data scalars
// are used unless there are none, in which cell scalars are used. Or you can
// explicitly control whether to use point or cell scalar data. Finally, the
// mapping of scalars through the lookup table varies depending on the
// setting of the ColorMode flag. See the documentation for the appropriate
// methods for an explanation.
//
// Another important feature of this class is whether to use immediate mode
// rendering (ImmediateModeRenderingOn) or display list rendering
// (ImmediateModeRenderingOff). If display lists are used, a data structure
// is constructed (generally in the rendering library) which can then be
// rapidly traversed and rendered by the rendering library. The disadvantage
// of display lists is that they require additionally memory which may affect
// the performance of the system.
//
// Another important feature of the mapper is the ability to shift the
// z-buffer to resolve coincident topology. For example, if you'd like to
// draw a mesh with some edges a different color, and the edges lie on the
// mesh, this feature can be useful to get nice looking lines. (See the
// ResolveCoincidentTopology-related methods.)

// .SECTION See Also
// vtkDataSetMapper vtkPolyDataMapper

#ifndef __vtkMapper_h
#define __vtkMapper_h

#include "vtkAbstractMapper3D.h"
#include "vtkScalarsToColors.h"
#include "vtkDataSet.h"

#define VTK_RESOLVE_OFF 0
#define VTK_RESOLVE_POLYGON_OFFSET 1
#define VTK_RESOLVE_SHIFT_ZBUFFER 2

#define VTK_GET_ARRAY_BY_ID 0
#define VTK_GET_ARRAY_BY_NAME 1

class vtkWindow;
class vtkRenderer;
class vtkActor;

class VTK_RENDERING_EXPORT vtkMapper : public vtkAbstractMapper3D
{
public:
  vtkTypeMacro(vtkMapper,vtkAbstractMapper3D);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Make a shallow copy of this mapper.
  void ShallowCopy(vtkAbstractMapper *m);

  // Description:
  // Overload standard modified time function. If lookup table is modified,
  // then this object is modified as well.
  unsigned long GetMTime();

  // Description:
  // Method initiates the mapping process. Generally sent by the actor 
  // as each frame is rendered.
  virtual void Render(vtkRenderer *ren, vtkActor *a) = 0;

  // Description:
  // Release any graphics resources that are being consumed by this mapper.
  // The parameter window could be used to determine which graphic
  // resources to release.
  virtual void ReleaseGraphicsResources(vtkWindow *) {};

  // Description:
  // Specify a lookup table for the mapper to use.
  void SetLookupTable(vtkScalarsToColors *lut);
  vtkScalarsToColors *GetLookupTable();

  // Description:
  // Create default lookup table. Generally used to create one when none
  // is available with the scalar data.
  virtual void CreateDefaultLookupTable();

  // Description:
  // Turn on/off flag to control whether scalar data is used to color objects.
  vtkSetMacro(ScalarVisibility,int);
  vtkGetMacro(ScalarVisibility,int);
  vtkBooleanMacro(ScalarVisibility,int);

  // Description:
  // Control how the scalar data is mapped to colors.  By default
  // (ColorModeToDefault), unsigned char scalars are treated as colors, and
  // NOT mapped through the lookup table, while everything else is. Setting
  // ColorModeToMapScalars means that all scalar data will be mapped through
  // the lookup table.  (Note that for multi-component scalars, the
  // particular component to use for mapping can be specified using the
  // ColorByArrayComponent() method.)
  vtkSetMacro(ColorMode,int);
  vtkGetMacro(ColorMode,int);
  void SetColorModeToDefault() 
    {this->SetColorMode(VTK_COLOR_MODE_DEFAULT);};
  void SetColorModeToMapScalars() 
    {this->SetColorMode(VTK_COLOR_MODE_MAP_SCALARS);};

  // Description:
  // Return the method of coloring scalar data.
  const char *GetColorModeAsString();

  // Description:
  // Control whether the mapper sets the lookuptable range based on its
  // own ScalarRange, or whether it will use the LookupTable ScalarRange
  // regardless of it's own setting. By default the Mapper is allowed to set
  // the LookupTable range, but users who are sharing LookupTables between
  // mappers/actors will probably wish to force the mapper to use the
  // LookupTable unchanged.
  vtkSetMacro(UseLookupTableScalarRange,int);
  vtkGetMacro(UseLookupTableScalarRange,int);
  vtkBooleanMacro(UseLookupTableScalarRange,int);

  // Description:
  // Specify range in terms of scalar minimum and maximum (smin,smax). These
  // values are used to map scalars into lookup table. Has no effect when
  // UseLookupTableScalarRange is true.
  vtkSetVector2Macro(ScalarRange,float);
  vtkGetVectorMacro(ScalarRange,float,2);

  // Description:
  // Turn on/off flag to control whether data is rendered using
  // immediate mode or note. Immediate mode rendering
  // tends to be slower but it can handle larger datasets.
  // The default value is immediate mode off. If you are
  // having problems rendering a large dataset you might
  // want to consider using immediate more rendering.
  vtkSetMacro(ImmediateModeRendering,int);
  vtkGetMacro(ImmediateModeRendering,int);
  vtkBooleanMacro(ImmediateModeRendering,int);

  // Description:
  // Turn on/off flag to control whether data is rendered using
  // immediate mode or note. Immediate mode rendering
  // tends to be slower but it can handle larger datasets.
  // The default value is immediate mode off. If you are 
  // having problems rendering a large dataset you might
  // want to consider using immediate more rendering.
  static void SetGlobalImmediateModeRendering(int val);
  static void GlobalImmediateModeRenderingOn() 
    {vtkMapper::SetGlobalImmediateModeRendering(1);};
  static void GlobalImmediateModeRenderingOff() 
    {vtkMapper::SetGlobalImmediateModeRendering(0);};
  static int  GetGlobalImmediateModeRendering();

  // Description:
  // Control how the filter works with scalar point data and cell attribute
  // data.  By default (ScalarModeToDefault), the filter will use point data,
  // and if no point data is available, then cell data is used. Alternatively
  // you can explicitly set the filter to use point data
  // (ScalarModeToUsePointData) or cell data (ScalarModeToUseCellData).
  // You can also choose to get the scalars from an array in point field
  // data (ScalarModeToUsePointFieldData) or cell field data
  // (ScalarModeToUseCellFieldData).  If scalars are coming from a field
  // data array, you must call ColorByArrayComponent before you call
  // GetColors.
  vtkSetMacro(ScalarMode,int);
  vtkGetMacro(ScalarMode,int);
  void SetScalarModeToDefault() {
    this->SetScalarMode(VTK_SCALAR_MODE_DEFAULT);};
  void SetScalarModeToUsePointData() {
    this->SetScalarMode(VTK_SCALAR_MODE_USE_POINT_DATA);};
  void SetScalarModeToUseCellData() {
    this->SetScalarMode(VTK_SCALAR_MODE_USE_CELL_DATA);};
  void SetScalarModeToUsePointFieldData() {
    this->SetScalarMode(VTK_SCALAR_MODE_USE_POINT_FIELD_DATA);};
  void SetScalarModeToUseCellFieldData() {
    this->SetScalarMode(VTK_SCALAR_MODE_USE_CELL_FIELD_DATA);};
  
  // Description:
  // Choose which component of which field data array to color by.
  void ColorByArrayComponent(int arrayNum, int component);
  void ColorByArrayComponent(char* arrayName, int component);
  
  // Description:
  // Get the array name or number and component to color by.
  char* GetArrayName() { return this->ArrayName; }
  int GetArrayId() { return this->ArrayId; }
  int GetArrayAccessMode() { return this->ArrayAccessMode; }
  int GetArrayComponent() { return this->ArrayComponent; }

  // Description:
  // Return the method for obtaining scalar data.
  const char *GetScalarModeAsString();

  // Description:
  // Set/Get a global flag that controls whether coincident topology (e.g., a
  // line on top of a polygon) is shifted to avoid z-buffer resolution (and
  // hence rendering problems). If not off, there are two methods to choose
  // from. PolygonOffset uses graphics systems calls to shift polygons, but
  // does not distinguish vertices and lines from one another. ShiftZBuffer
  // remaps the z-buffer to distinguish vertices, lines, and polygons, but
  // does not always produce acceptable results. If you use the ShiftZBuffer
  // approach, you may also want to set the ResolveCoincidentTopologyZShift
  // value. (Note: not all mappers/graphics systems implement this 
  // functionality.)
  static void SetResolveCoincidentTopology(int val);
  static int  GetResolveCoincidentTopology();
  static void SetResolveCoincidentTopologyToDefault();
  static void SetResolveCoincidentTopologyToOff() 
    {SetResolveCoincidentTopology(VTK_RESOLVE_OFF);}
  static void SetResolveCoincidentTopologyToPolygonOffset() 
    {SetResolveCoincidentTopology(VTK_RESOLVE_POLYGON_OFFSET);}
  static void SetResolveCoincidentTopologyToShiftZBuffer() 
    {SetResolveCoincidentTopology(VTK_RESOLVE_SHIFT_ZBUFFER);}

  // Description:
  // Used to set the polygon offset scale factor and units.
  // Used when ResolveCoincidentTopology is set to PolygonOffset. 
  // These are global variables.
  static void SetResolveCoincidentTopologyPolygonOffsetParameters(float factor,
                                                                  float units);
  static void GetResolveCoincidentTopologyPolygonOffsetParameters(float& factor,
                                                                  float& units);

  // Description:
  // Used to set the z-shift if ResolveCoincidentTopology is set to
  // ShiftZBuffer. This is a global variable.
  static void SetResolveCoincidentTopologyZShift(double val);
  static double GetResolveCoincidentTopologyZShift();

  // Description:
  // Return bounding box (array of six floats) of data expressed as
  // (xmin,xmax, ymin,ymax, zmin,zmax).
  virtual float *GetBounds();
  virtual void GetBounds(float bounds[6]) 
    {this->vtkAbstractMapper3D::GetBounds(bounds);};

  // Description:
  // This instance variable is used by vtkLODActor to determine which
  // mapper to use.  It is an estimate of the time necessary to render.
  // Setting the render time does not modify the mapper.
  void SetRenderTime(float time) {this->RenderTime = time;}
  vtkGetMacro(RenderTime, float);

  //BTX
  // Description:
  // Get the input as a vtkDataSet.  This method is overridden in
  // the specialized mapper classes to return more specific data types.
  vtkDataSet *GetInput();
  //ETX

  // Description:
  // Get the input to this mapper as a vtkDataSet, instead of as a 
  // more specialized data type that the subclass may return from
  // GetInput().  This method is provided for use in the wrapper languages,
  // C++ programmers should use GetInput() instead.
  vtkDataSet *GetInputAsDataSet() 
    {return this->GetInput();}

  // Description:
  // Map the scalars (if there are any scalars and ScalarVisibility is on)
  // through the lookup table, returning an unsigned char RGBA array. This is
  // typically done as part of the rendering process. The alpha parameter 
  // allows the blending of the scalars with an additional alpha (typically
  // which comes from a vtkActor, etc.)
  vtkUnsignedCharArray *MapScalars(float alpha);
  
  // Description:
  // Update the input to the Mapper.
  virtual void Update();

protected:
  vtkMapper();
  ~vtkMapper();

  vtkUnsignedCharArray *Colors;

  vtkScalarsToColors *LookupTable;
  int ScalarVisibility;
  vtkTimeStamp BuildTime;
  float ScalarRange[2];
  int UseLookupTableScalarRange;
  int ImmediateModeRendering;
  int ColorMode;
  int ScalarMode;

  float RenderTime;

  // for coloring by a component of a field data array
  int ArrayId;
  char ArrayName[256];
  int ArrayComponent;
  int ArrayAccessMode;
private:
  vtkMapper(const vtkMapper&);  // Not implemented.
  void operator=(const vtkMapper&);  // Not implemented.
};

#endif
