MFSM || GlutIO module

Alexandre R.J. François

Module version: 0.3
FSF code version: 0.8
ARJF © 2007

contents

Description
Reference guide
Index

description

The GlutIO module encapsulates the GL Utility Toolkit (GLUT) for OpenGL rendering, keyboard, mouse and joystick input (joystick not supported on all platforms by GLUT API implementations).

The module is in theory cross-platform. A compilation variable corresponding to the target platform must be set at compilation time. Possible values are GLUTIO_CARBONGLUTIO_X11 (linux/X11), and GLUTIO_WIN32 (win32). So far however, the module has only been successfully tested on Mac OS X and on win32 platforms. The X11 version is currently not functional; the source of the problem remains under investigation...

The module implements two main classes of functionalities present in the GLUT API: creation and management of a GLUT-controlled OpenGL rendering context, and handling and processing of interaction events generated by control devices.

GLUT encapsulation

The CGlutIO class encapsulates the setup and operation of a single GLUT-managed OpenGL rendering context. Most of the challenges (and limitations of the resulting module elements) result from the sharing of the context among multiple threads.

Control devices

reference guide

GlutIO module elements are defined in the glutio namespace. This section lists all the elements defined in the Image module, in alphabetical order.

CGlutIO

Encapsulate GLUT API for events and rendering context management. Implements the singleton pattern: only one instance can exist at any time.

Data members

• static fsf::CMutex m_csContext : mutex for rendering context
• static int m_nWidth : context window width; updated automatically by the window reshape callback; useful for manipulating window coordinates associated with events
• static int m_nHeight : context window height; updated automatically by the window reshape callback; useful for manipulating window coordinates associated with events
• static CKeyboardInput *m_pKb : pointer to keyboard input cell
• static CMouseInput *m_pMs : pointer to mouse input cell

Mac OS X

• static CGLContextObj m_context : rendering context

X11

• static Display* m_display : display associated to context
• static GLXDrawable m_drawable : drawable associated with context
• static GLXContext m_context : rendering context

Win32

• static HDC m_hdc;
• static HGLRC m_context : rendering context handle

Member functions

Singleton instance management

• static CGlutIO* GetInstance() : singleton allocator, returns pointer to unique instance (allocate it if does not already exist)
• static void DeleteInstance() : clean up
• static void Init() : initialization (create context, etc.)
• ~CGlutIO() : destructor

Callbacks

• static void DisplayCb(void) : display callback
• static void IdleCb() : idle callback
• static void ReshapeCb(int width, int height) : window resizing callback; updates context window width and height variables.
• static void KeyCb(unsigned char key, int x, int y) : keyboard callback
• static void MouseCb(int button, int state, int x, int y) : mouse (click) callback
• static void MotionCb(int x, int y) : mouse motion (one or more button pressed) callback
• static void PassiveMotionCb(int x, int y) : mouse passive motion (no button pressed) callback
• static void JoystickCb(unsigned int buttonMask, int x, int y, int z) : joystick callback
• static void RegisterKeyboardInput(CKeyboardInput *pKb) : bind keyboard input cell
• static void RegisterMouseInput(CMouseInput *pMs, bool bClick=true, bool bMotion=false, bool bActiveMotion=false) : bind mouse input cell
• static void RegisterJoystickInput(CJoystickInput *pJs, int pollInterval) : bind joystick input cell

Context switching

• static void ObtainContext() : context can only be current in a single thread at a time
• static void ReleaseContext() : must be called in order to make context available for other threads

Data access

• static int Width() : return context window width
• static int Height() : return context window height

Main loop

• static void MainLoop() : calls the GLUT main loop function to start processing events

CKeyboardEvent (fsf::CNode) "GLUTIO_KEYBOARD_EVENT"

Keyboard event node. Data corresponds to GLUT API.

Data members

• unsigned char m_key : key pressed
• int m_modif : modifier (SHIFT, CTRL, ALT) key state at the time the input key was pressed
• int m_x : mouse x position when key was pressed
• int m_y : mouse y location when key was pressed

Member functions

Constructors, destructor and other functions that are part of any derived node class

• CKeyboardEvent() : default constructor
• CKeyboardEvent(CNode *pParent, fsf::Time tTime=0) : initialization constructor
• CKeyboardEvent(const std::string &strName, CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CKeyboardEvent(unsigned int key, int modif, int x, int y, fsf::CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CKeyboardEvent(const std::string &strName, unsigned int key, int modif, int x, int y, fsf::CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CKeyboardEvent(const CKeyboardEvent&) : copy constructor
• CKeyboardEvent& operator=(const CKeyboardEvent&) : assignment operator
• virtual CNode* Clone() : virtual cloning member function (necessary for run-time polymorphism)
• virtual void GetTypeID(std::string &str) : factory mapping key

Data access

• unsigned char Key() const : return key pressed
• void SetKey(unsigned char key) : set key pressed value
• int Modifier() const : return modifier value
• void SetModifier(int modif) : set modifier value
• int X() const : return mouse x coordinate value associated with event
• void SetX(int x) : set mouse x coordinate value associated with event
• int Y() const : return mouse y coordinate value associated with event
• void SetY(int y) : set mouse y coordinate value associated with event

CKeyboardInput (fsf::CCell) "GLUTIO_KEYBOARD_INPUT"

Keyboard input cell: generate keyboard events on callback from the GLUT main loop. The Process() member function is not used (and thus not overloaded).

Member functions

Constructors, destructor and other functions that are part of any derived cell class

• CKeyboardInput() : default constructor
• virtual void GetTypeID(std::string &str) : factory mapping key; must be overloaded in any derived cell

Active stream processing

• void MakePulse(CKeyboardEvent *pNode) : function called by the callback to send keyboard event on the active stream.

CMouseEvent (fsf::CNode) "GLUTIO_MOUSE_EVENT"

Mouse event node. Data corresponds to GLUT API.

Data members

• int m_button : button concerned by the event (left, right, middle)
• int m_state : button state (up or down)
• int m_x : window-relative x coordinate of mouse pointer
• int m_y : window-relative x coordinate of mouse pointer

Member functions

Constructors, destructor and other functions that are part of any derived node class

• CMouseEvent() : default constructor
• CMouseEvent(CNode *pParent, fsf::Time tTime=0) : initialization constructor
• CMouseEvent(const std::string &strName, CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CMouseEvent(int button, int state, int x, int y, fsf::CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CMouseEvent(const std::string &strName, int button, int state, int x, int y, fsf::CNode *pParent=NULL, fsf::Time tTime=0) : initialization constructor
• CMouseEvent(const CMouseEvent&) : copy constructor
• CMouseEvent& operator=(const CMouseEvent&) : assignment operator
• virtual CNode* Clone() : virtual cloning member function (necessary for run-time polymorphism)
• virtual void GetTypeID(std::string &str) : factory mapping key

Data access

• int Button() const : return event button value
• void SetButton(int button) : set event button value
• int State() const : return event button state value
• void SetState(int state) : set event button state value
• int X() const : return mouse x coordinate value associated with event
• void SetX(int x) : set mouse x coordinate value associated with event
• int Y() const : return mouse y coordinate value associated with event
• void SetY(int y) : set mouse y coordinate value associated with event

CMouseInput (fsf::CCell) "GLUTIO_MOUSE_INPUT"

Mouse input cell: generate mouse events on callback from the GLUT main loop. The Process() member function is not used (and thus not overloaded).

Member functions

Constructors, destructor and other functions that are part of any derived cell class

• CMouseInput() : default constructor
• virtual void GetTypeID(std::string &str) : factory mapping key; must be overloaded in any derived cell

Active stream processing

• void MakePulse(CMouseEvent *pNode) : function called by the callback to send mouse event on the active stream.

RegisterFactories()

Registers the factories for the nodes and cells defined in the module, with the unique system instance.

index

C

• CGlutIO (singleton pattern)
• CKeyboardEvent
• CKeyboardInput
• CMouseEvent
• CMouseInput

R

• RegisterFactories