vtkOpenGLPolyDataMapper.h

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

  Program:   Visualization Toolkit

  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.

=========================================================================*/
#ifndef vtkOpenGLPolyDataMapper_h
#define vtkOpenGLPolyDataMapper_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkPolyDataMapper.h"
#include "vtkShader.h" // for methods
#include "vtkOpenGLHelper.h" // used for ivars
#include <vector> //for ivars
#include <map> //for methods

class vtkCellArray;
class vtkMatrix4x4;
class vtkMatrix3x3;
class vtkOpenGLTexture;
class vtkOpenGLBufferObject;
class vtkOpenGLVertexBufferObject;
class vtkTextureObject;

class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLPolyDataMapper : public vtkPolyDataMapper
{
public:
  static vtkOpenGLPolyDataMapper* New();
  vtkTypeMacro(vtkOpenGLPolyDataMapper, vtkPolyDataMapper)
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void RenderPiece(vtkRenderer *ren, vtkActor *act);


  virtual void RenderPieceStart(vtkRenderer *ren, vtkActor *act);
  virtual void RenderPieceDraw(vtkRenderer *ren, vtkActor *act);
  virtual void RenderPieceFinish(vtkRenderer *ren, vtkActor *act);
  virtual void RenderEdges(vtkRenderer *ren, vtkActor *act);

  void ReleaseGraphicsResources(vtkWindow *);

  vtkGetMacro(PopulateSelectionSettings,int);
  void SetPopulateSelectionSettings(int v) { this->PopulateSelectionSettings = v; };

  virtual bool GetSupportsSelection() { return true; }

  virtual bool GetIsOpaque();

  // used by RenderPiece and functions it calls to reduce
  // calls to get the input and allow for rendering of
  // other polydata (not the input)
  vtkPolyData *CurrentInput;


  vtkSetStringMacro(PointIdArrayName);
  vtkGetStringMacro(PointIdArrayName);
  vtkSetStringMacro(CellIdArrayName);
  vtkGetStringMacro(CellIdArrayName);


  vtkSetStringMacro(ProcessIdArrayName);
  vtkGetStringMacro(ProcessIdArrayName);


  vtkSetStringMacro(CompositeIdArrayName);
  vtkGetStringMacro(CompositeIdArrayName);

  // the following is all extra stuff to work around the
  // fact that gl_PrimitiveID does not work correctly on
  // Apple devices with AMD graphics hardware. See apple
  // bug ID 20747550
  static vtkPolyData *HandleAppleBug(
    vtkPolyData *poly,
    std::vector<float> &buffData);

protected:
  vtkOpenGLPolyDataMapper();
  ~vtkOpenGLPolyDataMapper();

  // the following is all extra stuff to work around the
  // fact that gl_PrimitiveID does not work correctly on
  // Apple devices with AMD graphics hardware. See apple
  // bug ID 20747550
  bool HaveAppleBug;
  std::vector<float> AppleBugPrimIDs;
  vtkOpenGLBufferObject *AppleBugPrimIDBuffer;

  virtual void ComputeBounds();


  virtual void UpdateShaders(
    vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);


  virtual bool GetNeedToRebuildShaders(
    vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);


  virtual void BuildShaders(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);


  virtual void GetShaderTemplate(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);


  virtual void ReplaceShaderValues(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);


  virtual void ReplaceShaderColor(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderLight(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderTCoord(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderPicking(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderDepthPeeling(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderPrimID(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderNormal(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderClip(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);
  virtual void ReplaceShaderPositionVC(
    std::map<vtkShader::Type, vtkShader *> shaders,
    vtkRenderer *ren, vtkActor *act);

  virtual void SetMapperShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);

  virtual void SetLightingShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);

  virtual void SetCameraShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);

  virtual void SetPropertyShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act);

  virtual void UpdateBufferObjects(vtkRenderer *ren, vtkActor *act);

  virtual bool GetNeedToRebuildBufferObjects(vtkRenderer *ren, vtkActor *act);

  virtual void BuildBufferObjects(vtkRenderer *ren, vtkActor *act);

  virtual void BuildIBO(vtkRenderer *ren, vtkActor *act, vtkPolyData *poly);

  // The VBO and its layout.
  vtkOpenGLVertexBufferObject *VBO;

  // Structures for the various cell types we render.
  vtkOpenGLHelper Points;
  vtkOpenGLHelper Lines;
  vtkOpenGLHelper Tris;
  vtkOpenGLHelper TriStrips;
  vtkOpenGLHelper TrisEdges;
  vtkOpenGLHelper TriStripsEdges;
  vtkOpenGLHelper *LastBoundBO;
  bool DrawingEdges;

  // do we have wide lines that require special handling
  virtual bool HaveWideLines(vtkRenderer *, vtkActor *);

  // values we use to determine if we need to rebuild
  int LastLightComplexity;
  vtkTimeStamp LightComplexityChanged;

  int LastSelectionState;
  vtkTimeStamp SelectionStateChanged;

  int LastDepthPeeling;
  vtkTimeStamp DepthPeelingChanged;

  bool UsingScalarColoring;
  vtkTimeStamp VBOBuildTime; // When was the OpenGL VBO updated?
  vtkOpenGLTexture* InternalColorTexture;

  int PopulateSelectionSettings;
  int PrimitiveIDOffset;

  vtkMatrix4x4 *TempMatrix4;
  vtkMatrix3x3 *TempMatrix3;

  // this vector can be used while building
  // the shader program to record specific variables
  // that are being used by the program. This is
  // useful later on when setting uniforms. At
  // that point IsShaderVariableUsed can be called
  // to see if the uniform should be set or not.
  std::vector<std::string> ShaderVariablesUsed;

  // used to see if the shader building code indicated that
  // a specific variable is being used. Only some variables
  // are currently populated.
  bool IsShaderVariableUsed(const char *);

  // if set to true, tcoords will be passed to the
  // VBO even if the mapper knows of no texture maps
  // normally tcoords are only added to the VBO if the
  // mapper has indentified a texture map as well.
  bool ForceTextureCoordinates;

  void BuildCellTextures(
    vtkRenderer *ren,
    vtkActor *,
    vtkCellArray *prims[4],
    int representation);

  void AppendCellTextures(
    vtkRenderer *ren,
    vtkActor *,
    vtkCellArray *prims[4],
    int representation,
    std::vector<unsigned char> &colors,
    std::vector<float> &normals,
    vtkPolyData *pd);

  bool HavePickScalars;
  vtkTextureObject *CellScalarTexture;
  vtkOpenGLBufferObject *CellScalarBuffer;
  bool HaveCellScalars;
  vtkTextureObject *CellNormalTexture;
  vtkOpenGLBufferObject *CellNormalBuffer;
  bool HaveCellNormals;

  // aditional picking indirection
  char* PointIdArrayName;
  char* CellIdArrayName;
  char* ProcessIdArrayName;
  char* CompositeIdArrayName;

  int TextureComponents;

private:
  vtkOpenGLPolyDataMapper(const vtkOpenGLPolyDataMapper&); // Not implemented.
  void operator=(const vtkOpenGLPolyDataMapper&); // Not implemented.
};

#endif