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

  Program:   Visualization Toolkit
  Module:    vtkPrimitivePainter.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   vtkPrimitivePainter
 * @brief   superclass for class that handle single
 * privmitives.
 *
 * This is the abstract superclass for classes that handle single type
 * of primitive i.e. verts, lines, polys or tstrips.
 * Concrete subclasses will pass a Render() call to the delegate painter,
 * if any, only if it could not render.
 * @par Thanks:
 * Support for generic vertex attributes in VTK was contributed in
 * collaboration with Stephane Ploix at EDF.
*/

#ifndef vtkPrimitivePainter_h
#define vtkPrimitivePainter_h

#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkPolyDataPainter.h"

class vtkDataArray;
class vtkPoints;
class vtkUnsignedCharArray;

class VTKRENDERINGOPENGL_EXPORT vtkPrimitivePainter : public vtkPolyDataPainter
{
public:
  vtkTypeMacro(vtkPrimitivePainter, vtkPolyDataPainter);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  //@{
  /**
   * Get the type of primitive supported by this painter.
   * This must be set by concrete subclasses.
   */
  vtkGetMacro(SupportedPrimitive, int);
  //@}

protected:
  vtkPrimitivePainter();
  ~vtkPrimitivePainter() override;

  enum {
    VTK_PDM_NORMALS = 0x001,
    VTK_PDM_COLORS = 0x002,
    VTK_PDM_TCOORDS = 0x004,
    VTK_PDM_CELL_COLORS = 0x008,
    VTK_PDM_CELL_NORMALS = 0x010,
    VTK_PDM_OPAQUE_COLORS = 0x020,
    VTK_PDM_FIELD_COLORS = 0x040,
    VTK_PDM_EDGEFLAGS = 0x080,
    VTK_PDM_GENERIC_VERTEX_ATTRIBUTES = 0x100
  };

  /**
   * Some subclasses may need to do some preprocessing
   * before the actual rendering can be done eg. build efficient
   * representation for the data etc. This should be done here.
   * This method get called after the ProcessInformation()
   * but before RenderInternal().
   * This method is overridden to update the output data
   * as per the input.
   */
  void PrepareForRendering(vtkRenderer*, vtkActor*) override;

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

  /**
   * Subclasses need to override this to return the output of the pipeline.
   */
  vtkDataObject* GetOutput() override;

  /**
   * The actual rendering happens here. This method is called only when
   * SupportedPrimitive is present in typeflags when Render() is invoked.
   * This method returns 1 when the rendering was successful.
   * Concrete Primitive painters may support rendering a primitive only
   * when the input data satifies certain criteria. The return value is used
   * to decide if the subclasses succeeded in rendereing. If not the
   * render request is forwarded to the delegate. On success, the request
   * forwareded to the delegate does not include a request to render the
   * supported primitive type.
   */
  virtual int RenderPrimitive(unsigned long flags, vtkDataArray* n,
    vtkUnsignedCharArray* c, vtkDataArray* t, vtkRenderer* ren) =0;

  /**
   * Based on the input polydata, setups certains flags and call
   * RenderPrimitive() which is overridden by subclasses. If RenderPrimitive()
   * is successful, the request forwarded to the delegate painter
   * is with typeflags = (typeflags & ~this->SupportedPrimitive) i.e.
   * the request is to render everything other than what the subclass rendered.
   */
  void RenderInternal(vtkRenderer* renderer, vtkActor* actor,
                              unsigned long typeflags,
                              bool forceCompileOnly) override;

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

  int SupportedPrimitive; // must be set by subclasses.
  vtkSetMacro(SupportedPrimitive, int);

  int DisableScalarColor;

  vtkPolyData* OutputData;
  vtkTimeStamp OutputUpdateTime;
  bool GenericVertexAttributes;
  bool MultiTextureAttributes;

private:
  vtkPrimitivePainter(const vtkPrimitivePainter&) = delete;
  void operator=(const vtkPrimitivePainter&) = delete;
};

#endif