''Answers''


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1. Control is passed back to the programmer by registering callback functions. These functions are called whenever events such as window resizing, user input, or even a call to display the screen occur. A function pointer for each desired event is passed to the corresponding GLUT function at initialization.

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1. Control is passed back to the programmer by registering callback functions. These functions are called whenever events such as window resizing, user input, or even a call to display the screen occur. A function pointer for each desired event is passed to the corresponding GLUT function at initialization.

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2.  The parameter is a bitmap that determines a number of display mode settings. Some include whether to use RGBA or color indexing a single or double buffered window, and to possibly use an associated depth, stencil, or accumulation buffer.

3. GlViewport defines the rectangular area of the window that displays the image.

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    GlOrtho creates a viewing volume that maintains the actual size and angles of objects contained in the volume. Only objects inside the volume can be displayed on the screen.

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    GlOrtho creates a viewing volume that maintains the actual size and angles of objects contained in the volume. Only objects inside the volume can be displayed on the screen.

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