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Overview

Overview. Before You Start Structure of a Module Ports and Datatypes Component Wizard GUI’s Dynamic Compilation. Before You Start. Design Your Function A Module is a Function Inputs and Outputs User Input (GUI Variables) Dataflow Coding Standard Standards Advice

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Overview

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  1. Overview • Before You Start • Structure of a Module • Ports and Datatypes • Component Wizard • GUI’s • Dynamic Compilation

  2. Before You Start • Design Your Function • A Module is a Function • Inputs and Outputs • User Input (GUI Variables) • Dataflow • Coding Standard • Standards • Advice • SCIRun/doc/Developer/Guide/coding_standard.html

  3. Module Structure • Support Files • .cc file • sub.mk • .xml file • .tcl file • sub.mk • .h file (optional)

  4. Ports and Datatypes • Ports • LockingHandles • Generation number • Memory Management • Sending Data • Cache Results • Datatypes • Fields, Matrix, SceneGraph • Detach (Dataflow) • Properties

  5. Component Wizard • Adding a Module

  6. Component Wizard

  7. Component Wizard • Edit a Port • Name • Namespace

  8. Component Wizard • Package • Category • Path

  9. Component Wizard • New Package? • New Category? • Reconfiguring.

  10. Component Wizard • After Compiling

  11. Component Wizard • Your Skeleton GUI

  12. GUI’s • TCL • itcl • blt • Use Simple GUI as a Pattern • GuiVars

  13. GUI’s • itcl_class SCIRun_Fields_SelectField { inherit Module constructor {config} { set name SelectField global $this-stampvalue global $this-runmode set_defaults } method set_defaults {} { set $this-stampvalue 100 set $this-runmode 0 # 0 nothing 1 accumulate 2 replace } method replace {} { set $this-runmode 2 $this-c needexecute } method accumulate {} { set $this-runmode 1 $this-c needexecute }

  14. GUI’s • method ui {} { set w .ui[modname] if {[winfo exists $w]} { raise $w return } toplevel $w frame $w.row1 frame $w.row3 frame $w.row4 pack $w.row1 $w.row3 $w.row4 -side top -e y -f both -padx 5 -pady 5 label $w.row1.value_label -text "Selection Value" entry $w.row1.value -textvariable $this-stampvalue pack $w.row1.value_label $w.row1.value -side left button $w.row3.execute -text "Replace" -command "$this replace" pack $w.row3.execute -side top -e n -f both button $w.row4.execute -text "Accumulate" -command "$this accumulate" pack $w.row4.execute -side top -e n -f both }

  15. GUI’s • GuiVars • Values to from C side • Initialize • C++ side constructor synchs with tcl name • tcl side sets the initial value • my_var.reset() • my_var.get() • tcl_command(...) • $this-c “needexecute”

  16. Dynamic Compilation • Motivation • SCIRun::Field • Code Explosion • Extensibility • Maintenance

  17. Dynamic Compilation • Field Types (4) TetVol, LatticeVol, ContourField, TriSurf • Supported Data Types (9) double, int, char, unsigned char, short, unsigned short, bool, Vector, and Tensor • An Algorithm Parameterized on One Field Type • Requires 36 Field instantiations • And 36 Algorithm Instantiations • Parameterized On Two Fields • 362 =1296 Versions of the Algorithm • Parameterized On Three Fields • 363 =46656 Versions of the Algorithm • Actual implementation supports more Field and Data types • Very few of these combinations are needed by any one person or application

  18. Algorithm Structure • Algorithm Base Class • Inherits from common base class • Defines the pure virtual interface needed by a module • Provides a static CompileInfo • Templated Algorithm • Implements the pure virtual interface in the base class • Potentially specialized for specific field type template<class Field> RenderField : public RenderFieldBase virtual void render(FieldBase&)=0;

  19. TypeDescription • TypeDescription object augments RTTI • Holds: • Strings that describe object’s exact type • Namespace string • Path to the .h file that declares the object • Has a recursive structure • Example: foo<bar, foobar<int> >;

  20. CompileInfo • Similar info as a TypeDescription • Algorithm is not instantiated, so cannot yet be queried • Start with a CompileInfo from Algorithm base class • Augmented with information from all pertinent TypeDescription objects for the specific types involved • Passed to DynamicLoader, which creates the proper type

  21. DynamicLoader • Returns Requested Algorithm • Writes C++ instantiation code • Compile shared library, using SCIRun makefiles • Load shared library (dlopen) • Return Instance of Algorithm (Cached for next use) • Synchronization code such that • Only 1 thread can compile at a time per algorithm • Multiple algorithms can compile and load at the same time

  22. Calling Module • void ShowField::execute(){// Get a Field from input field port. field = (FieldIPort *)get_iport("Field"); field->get(field_handle);// Get the input field's type info. const TypeDescription *td = field_handle->get_type_description();// Get the Algorithm. CompileInfo *ci = RenderFieldBase::get_compile_info(td); if (! DynamicLoader::scirun_loader().get(*ci, rend_algo)) { error("Could not compile algorithm for ShowField -"); • return; } RenderFieldBase *rf = dynamic_cast<RenderFieldBase*>(rend_algo);// Let the templated algorithm render this field. rf->render(field_handle, /* any other parameters from gui */);// Send results downstream...} No template instantiations for the exact algorithm type

  23. Example • //! ConvertTetBase supports the dynamically loadable algorithm concept.//! when dynamically loaded the user will dynamically cast to a //! ConvertTetBase from the DynamicAlgoBase they will have a pointer to.class ConvertTetBase : public DynamicAlgoBase{public: virtual FieldHandle convert_quadratic(FieldHandle in) = 0; virtual ~ConvertTetBase(); static const string& get_h_file_path(); static string dyn_file_name(const TypeDescription *td) {// add no extension. return template_class_name() + "." + td->get_filename() + "."; } static const string base_class_name() { static string name("ConvertTetBase"); return name; } static const string template_class_name() { static string name("ConvertTet"); return name; }//! support the dynamically compiled algorithm concept static CompileInfo *get_compile_info(const TypeDescription *td);};

  24. Example • template <class Fld>class ConvertTet : public ConvertTetBase{public://! virtual interface. virtual FieldHandle convert_quadratic(FieldHandle in);};template <class Fld>FieldHandleConvertTet<Fld>::convert_quadratic(FieldHandle ifh){Fld *fld = dynamic_cast<Fld*>(ifh.get_rep()); ASSERT(fld != 0); typedef typename Fld::value_type val_t; FieldHandle fh(QuadraticTetVolField<val_t>::create_from(*fld)); return fh;}

  25. Summary • Concepts • Ports and Datatypes • Modules (Component Wizard) • Templated Algorithms • Dynamic Loading

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