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

  Program:   Visualization Toolkit
  Module:    vtkCompositePainter.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   vtkCompositePainter
 * @brief   painter that can be inserted before any
 * vtkDataSet painting chain to handle composite datasets.
 *
 * vtkCompositePainter iterates over the leaves in a composite datasets.
 * This painter can also handle the case when the dataset is not a composite
 * dataset.
*/

#ifndef vtkCompositePainter_h
#define vtkCompositePainter_h

#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkPainter.h"
#include "vtkColor.h" // needed for vtkColor3d
#include <stack> //  needed for RenderBlockState.

class vtkCompositeDataDisplayAttributesLegacy;
class vtkInformationObjectBaseKey;
class vtkProperty;
class vtkRenderWindow;

class VTKRENDERINGOPENGL_EXPORT vtkCompositePainter : public vtkPainter
{
public:
  static vtkCompositePainter* New();
  vtkTypeMacro(vtkCompositePainter, vtkPainter);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Get the output data object from this painter. The default implementation
   * simply forwards the input data object as the output.
   */
  vtkDataObject* GetOutput() override;

  /**
   * Key used to pass a vtkCompositeDataDisplayAttributesLegacy instance doing the
   * painter pipeline.
   */
  static vtkInformationObjectBaseKey* DISPLAY_ATTRIBUTES();

  /**
   * Set/get the composite data set display attributes. If set, these attributes
   * can be used by the painter to control specific rendering attributes on a
   * per-block basis for a multi-block dataset.
   */
  void SetCompositeDataDisplayAttributes(vtkCompositeDataDisplayAttributesLegacy *attributes);
  vtkGetObjectMacro(CompositeDataDisplayAttributes, vtkCompositeDataDisplayAttributesLegacy)

protected:
  vtkCompositePainter();
  ~vtkCompositePainter() override;

  /**
   * Take part in garbage collection.
   */
  void ReportReferences(vtkGarbageCollector *collector) override;

  /**
   * Called before RenderInternal() if the Information has been changed
   * since the last time this method was called.
   */
  void ProcessInformation(vtkInformation* information) override;

  /**
   * Performs the actual rendering. Subclasses may override this method.
   * default implementation merely call a Render on the DelegatePainter,
   * if any. When RenderInternal() is called, it is assured that the
   * DelegatePainter is in sync with this painter i.e. UpdateDelegatePainter()
   * has been called.
   */
  void RenderInternal(vtkRenderer* renderer, vtkActor* actor,
    unsigned long typeflags, bool forceCompileOnly) override;

  class RenderBlockState
  {
  public:
    std::stack<bool> Visibility;
    std::stack<double> Opacity;
    std::stack<vtkColor3d> AmbientColor;
    std::stack<vtkColor3d> DiffuseColor;
    std::stack<vtkColor3d> SpecularColor;

    double RenderedOpacity;
    vtkColor3d RenderedAmbientColor;
    vtkColor3d RenderedDiffuseColor;
    vtkColor3d RenderedSpecularColor;
  };

  void RenderBlock(vtkRenderer *renderer,
                   vtkActor *actor,
                   unsigned long typeflags,
                   bool forceCompileOnly,
                   vtkDataObject *dobj,
                   unsigned int &flat_index,
                   RenderBlockState &state);

  /**
   * Overridden in vtkOpenGLCompositePainter to pass attributes to OpenGL.
   */
  virtual void UpdateRenderingState(
    vtkRenderWindow*, vtkProperty*, RenderBlockState&) {}

  vtkDataObject* OutputData;
  vtkCompositeDataDisplayAttributesLegacy *CompositeDataDisplayAttributes;
private:
  vtkCompositePainter(const vtkCompositePainter&) = delete;
  void operator=(const vtkCompositePainter&) = delete;

};

#endif