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

  Program:   Visualization Toolkit
  Module:    vtkGenericVertexAttributeMapping.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.

=========================================================================*/
/**
 * @class   vtkGenericVertexAttributeMapping
 * @brief   stores mapping for data arrays to
 * generic vertex attributes.
 *
 * vtkGenericVertexAttributeMapping stores mapping between data arrays and
 * generic vertex attributes. It is used by vtkPainterPolyDataMapper to pass the
 * mappings to the painter which rendering the attributes.
 * @par Thanks:
 * Support for generic vertex attributes in VTK was contributed in
 * collaboration with Stephane Ploix at EDF.
*/

#ifndef vtkGenericVertexAttributeMapping_h
#define vtkGenericVertexAttributeMapping_h

#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkObject.h"

class VTKRENDERINGCORE_EXPORT vtkGenericVertexAttributeMapping : public vtkObject
{
public:
  static vtkGenericVertexAttributeMapping* New();
  vtkTypeMacro(vtkGenericVertexAttributeMapping, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Select a data array from the point/cell data
   * and map it to a generic vertex attribute.
   * Note that indices change when a mapping is added/removed.
   */
  void AddMapping(const char* attributeName, const char* arrayName,
    int fieldAssociation, int component);

  /**
   * Select a data array and use it as multitexture texture
   * coordinates.
   * Note the texture unit parameter should correspond to the texture
   * unit set on the texture.
   */
  void AddMapping(
    int unit, const char* arrayName, int fieldAssociation,
    int component);

  /**
   * Remove a vertex attribute mapping.
   */
  bool RemoveMapping(const char* attributeName);

  /**
   * Remove all mappings.
   */
  void RemoveAllMappings();

  /**
   * Get number of mapppings.
   */
  unsigned int GetNumberOfMappings();

  /**
   * Get the attribute name at the given index.
   */
  const char* GetAttributeName(unsigned int index);

  /**
   * Get the array name at the given index.
   */
  const char* GetArrayName(unsigned int index);

  /**
   * Get the field association at the given index.
   */
  int GetFieldAssociation(unsigned int index);

  /**
   * Get the component no. at the given index.
   */
  int GetComponent(unsigned int index);

  /**
   * Get the component no. at the given index.
   */
  int GetTextureUnit(unsigned int index);

protected:
  vtkGenericVertexAttributeMapping();
  ~vtkGenericVertexAttributeMapping() override;

private:
  vtkGenericVertexAttributeMapping(const vtkGenericVertexAttributeMapping&) = delete;
  void operator=(const vtkGenericVertexAttributeMapping&) = delete;

  class vtkInternal;
  vtkInternal* Internal;

};

#endif


