text: /*=========================================================================
  
    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.
  
  =========================================================================*/
  /**
   * @class   vtkOpenGLStickMapper
   * @brief   use imposters to draw cylinders
   *
   * PolyDataMapper that uses imposters to draw cylinders/sticks
   * for ball/stick style molecular rendering. Supports picking.
  */
  
  #ifndef vtkOpenGLStickMapper_h
  #define vtkOpenGLStickMapper_h
  
  #include "vtkRenderingOpenGL2Module.h" // For export macro
  #include "vtkOpenGLPolyDataMapper.h"
  
  class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLStickMapper : public vtkOpenGLPolyDataMapper
  {
  public:
    static vtkOpenGLStickMapper* New();
    vtkTypeMacro(vtkOpenGLStickMapper, vtkOpenGLPolyDataMapper)
    void PrintSelf(ostream& os, vtkIndent indent) override;
  
    //@{
    /**
     * Convenience method to set the array to scale with.
     */
    vtkSetStringMacro(ScaleArray);
    //@}
  
    //@{
    /**
     * Convenience method to set the array to orient with
     */
    vtkSetStringMacro(OrientationArray);
    //@}
  
    //@{
    /**
     * Convenience method to set the array to select with
     */
    vtkSetStringMacro(SelectionIdArray);
    //@}
  
  protected:
    vtkOpenGLStickMapper();
    ~vtkOpenGLStickMapper() override;
  
    /**
     * Create the basic shaders before replacement
     */
    void GetShaderTemplate(
      std::map<vtkShader::Type, vtkShader *> shaders,
      vtkRenderer *ren, vtkActor *act) override;
  
    /**
     * Perform string replacments on the shader templates
     */
    void ReplaceShaderValues(
      std::map<vtkShader::Type, vtkShader *> shaders,
      vtkRenderer *ren, vtkActor *act) override;
  
    /**
     * Set the shader parameters related to the Camera
     */
    void SetCameraShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act) override;
  
    /**
     * Set the shader parameters related to the actor/mapper
     */
    void SetMapperShaderParameters(vtkOpenGLHelper &cellBO, vtkRenderer *ren, vtkActor *act) override;
  
    const char *ScaleArray;
    const char *OrientationArray;
    const char *SelectionIdArray;
  
    /**
     * Does the VBO/IBO need to be rebuilt
     */
    bool GetNeedToRebuildBufferObjects(vtkRenderer *ren, vtkActor *act) override;
  
    /**
     * Update the VBO to contain point based values
     */
    void BuildBufferObjects(vtkRenderer *ren, vtkActor *act) override;
  
    void RenderPieceDraw(vtkRenderer *ren, vtkActor *act) override;
  
  private:
    vtkOpenGLStickMapper(const vtkOpenGLStickMapper&) = delete;
    void operator=(const vtkOpenGLStickMapper&) = delete;
  };
  
  #endif
  