What is glutKeyboardFunc?

glutKeyboardFunc sets the keyboard callback for the current window. When a user types into the window, each key press generating an ASCII character will generate a keyboard callback. When a new window is created, no keyboard callback is initially registered, and ASCII key strokes in the window are ignored.

What is the correct purpose of the glutKeyboardFunc () function?

GLUT provides two functions to register callbacks for keyboard events that occur when you press a key. The first one, glutKeyboardFunc, is used to tell the windows system which function we want to process the “normal” key events. By “normal” keys, we mean letters, numbers, anything that has an ASCII code.

What is glutDisplayFunc opengl?

Description. glutDisplayFunc sets the display callback for the current window. When GLUT determines that the normal plane for the window needs to be redisplayed, the display callback for the window is called.

What is GLUT idle function?

glutIdleFunc sets the global idle callback to be func so a GLUT program can perform background processing tasks or continuous animation when window system events are not being received. If enabled, the idle callback is continuously called when events are not being received.

What is glutReshapeFunc?

glutReshapeFunc sets the reshape callback for the current window. The reshape callback is triggered when a window is reshaped. A reshape callback is also triggered immediately before a window’s first display callback after a window is created or whenever an overlay for the window is established.

What is glutPostRedisplay in opengl?

glutPostRedisplay marks the current window as needing to be redisplayed. Usage void glutPostRedisplay(void); Description. Mark the normal plane of current window as needing to be redisplayed. The next iteration through glutMainLoop, the window’s display callback will be called to redisplay the window’s normal plane.

What is glutInitWindowPosition?

glutInitWindowPosition and glutInitWindowSize set the initial window position and size respectively. Usage. void glutInitWindowSize(int width, int height); void glutInitWindowPosition(int x, int y); width. Width in pixels.

What type of function is glutDisplayFunc ()?

glutDisplayFunc(void (*func)(void)) is the first and most important event callback function you will see. Whenever GLUT determines that the contents of the window need to be redisplayed, the callback function registered by glutDisplayFunc() is executed.

What is one callback that must be registered when using GLUT?

GLUT supports a number of callbacks to respond to events. There are three types of callbacks: window, menu, and global. Window callbacks indicate when to redisplay or reshape a window, when the visibility of the window changes, and when input is available for the window.

What is glutPostRedisplay?

What is gluOrtho2D?

gluOrtho2D() sets up a two-dimensional orthographic viewing region. This is equivalent to calling glOrtho() with near = -1 and far = 1 .

What is the use of in reshape?

The reshape() function is used to give a new shape to an array without changing its data. Array to be reshaped. The new shape should be compatible with the original shape.