avtOpenGLStreamlineRenderer.h 5.91 KB
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/*****************************************************************************
*
* Copyright (c) 2000 - 2008, Lawrence Livermore National Security, LLC
* Produced at the Lawrence Livermore National Laboratory
* LLNL-CODE-400142
* All rights reserved.
*
* This file is  part of VisIt. For  details, see https://visit.llnl.gov/.  The
* full copyright notice is contained in the file COPYRIGHT located at the root
* of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
*
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* modification, are permitted provided that the following conditions are met:
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*    this  list of  conditions  and  the  disclaimer (as noted below)  in  the
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// ************************************************************************* //
//                         avtOpenGLStreamlineRenderer.h                       //
// ************************************************************************* //

#ifndef AVT_OPEN_GL_STREAMLINE_RENDERER_H
#define AVT_OPEN_GL_STREAMLINE_RENDERER_H

#include <avtStreamlineRendererImplementation.h>
#include <StreamlineAttributes.h>
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#include <vtkType.h>

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#include <string>

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#define MAX_DETAIL_LEVELS 4
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class avtGLSLProgram;
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class vtkCamera;
class vtkAppendPolyData;
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// ****************************************************************************
//  Class: avtOpenGLStreamlineRenderer
//
//  Purpose:
//      A custom renderer for streamlines.
//
//  Programmer:  Dave Pugmire
//  Creation:    December 29, 2009
//
//  Modifications:
//
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//   Dave Pugmire, Wed Jan 20 09:28:59 EST 2010
//   Add drawGeomHead, ramp opacity and illuminated line lighting model.
//
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//  Dave Pugmire, Fri Feb 12 14:02:57 EST 2010
//  Support for transparency sorting.
//
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//   Dave Pugmire, Tue Feb 16 09:08:32 EST 2010
//   Add display head geom as cone.
//
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// ****************************************************************************

class avtOpenGLStreamlineRenderer : public avtStreamlineRendererImplementation
{
  public:
                            avtOpenGLStreamlineRenderer();
    virtual                ~avtOpenGLStreamlineRenderer();

  protected:
    virtual void            Render(vtkPolyData *data,
                                   const StreamlineAttributes&,
                                   bool immediateModeRendering,
                                   double vMin, double vMax,
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                                   vtkCamera *camera,
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                                   float ambient_coeff,
                                   float spec_coeff, float spec_power,
                                   float spec_r, float spec_g, float spec_b,
                                   const int *);

    virtual void   InvalidateColors();
    virtual void   SetLevelsLUT(avtLookupTable *);

    unsigned int displaylistid;
    StreamlineAttributes atts;

    float varMin, varMax, varDiff;
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    float opacityMin, opacityMax, opacityDiff;
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    float ambient_coeff;
    float spec_coeff;
    float spec_power;
    float spec_r;
    float spec_g;
    float spec_b;
    avtLookupTable *levelsLUT;
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    vtkCamera *camera;
    vtkAppendPolyData *appendForTranspPolys;
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    float *spherePts[MAX_DETAIL_LEVELS];
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    float *cylPts[MAX_DETAIL_LEVELS];
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    void CalculateSpherePts();
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    void CalculateConePts();
    void DrawSphere(float, float, float, float r, int);
    void DrawCone(float,float,float, float,float,float, float,float, int);
    vtkPolyData * GenerateConePolys(float,float,float, float,float,float, float, float, int, float, float);
    vtkPolyData * GenerateSpherePolys(float, float, float, float r, int, float, float);
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    std::string  colorTableName;
    std::vector<unsigned char> colorTable;

    void DrawStreamlines(vtkPolyData *data);

    void DrawAsLines(vtkPolyData *data);
    void DrawAsTubes(vtkPolyData *data);
    void DrawAsRibbons(vtkPolyData *data);
    
    void DrawSeedPoints(vtkPolyData *data);
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    void DrawHeadGeom(vtkPolyData *data);
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    vtkPolyData *MakeNewPolyline(vtkPolyData *data,
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                                 vtkIdType *&segptr);
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    void DrawPolyData(vtkPolyData *data);
    bool GetEndPoints(vtkPolyData *data, 
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                      vtkIdType *segptr,
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                      int nPts,
                      int &j0,
                      int &j1,
                      double &t0,
                      double &t1);
    
    inline void SetColor(const float &scalar, const float &opacity) const;
    void InitColors();
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    void InitVarOpacity(vtkPolyData *data);
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    float ComputeRampOpacity(const float &p) const;
    
    avtGLSLProgram* shader;
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};


#endif