GLUT Environment


Summary

This is an effort to abstract GLUT calls out of the main application
code.  The following handler functions must be defined externally:

 void visibility(int state)
 void reshape(int w, int h)
 void display()
 void idle()
 void mouse(int button, int state, int x, int y)
 void motion(int x, int y)
 void passive(int x, int y)
 void keydown(unsigned char key, int x, int y)
 void keyup(unsigned char key, int x, int y)
 void specialdown(int key, int x, int y)
 void specialup(int key, int x, int y)


Defines

 LEFT_ARROW		= 100
 UP_ARROW		= 101
 RIGHT_ARROW		= 102
 DOWN_ARROW		= 103

 DOUBLE_RGBA_DEPTH	= GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH
 WinsysInit(x, y)	= glutInit(x, y)
 InitDisplayMode(mode)	= glutInitDisplayMode(mode)
 WarpPointer(x, y)	= glutWarpPointer(x, y)
 SwapBuffers()		= glutSwapBuffers()
 GetWindowWidth()	= glutGet(GLUT_WINDOW_WIDTH)
 GetWindowHeight()	= glutGet(GLUT_WINDOW_HEIGHT)
 HideCursor()		= glutSetCursor(GLUT_CURSOR_NONE)
 ShowCursor()		= glutSetCursor(GLUT_CURSOR_INHERIT)
 KeyRepeatOn()		= glutSetKeyRepeat(GLUT_KEY_REPEAT_ON)
 KeyRepeatOff()		= glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF)
 MainLoop()		= glutMainLoop()
 EnterGameMode()	= glutEnterGameMode()
 LeaveGameMode()	= glutLeaveGameMode()


Functions

 void	non_display()

		Don't display anything.

 void	SetHandlers()

		Set all callback handlers to default functions.

 void	Pause()

		Nullify most callback handlers and set the display callback to
		non_display().

 void	Unpause()

		Set all callback handlers to default functions--SetHandlers().