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★ SGL User's Manual ★ PROGRAMMER'S TUTORIAL
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8-2. Scroll unit

A scroll is a collection of minute dots displayed on the monitor. In order to handle this point efficiently, SGL uses a scroll unit system as shown below.

A collection of 8 x 8 dots is called a cell, and when dealing with scrolling, we will proceed with this cell as the minimum unit. These cells gather together to form a character pattern, and these cells gather further to form a page, pages to form a plane, and planes to form a map.

＜ Figure 8-3 Scroll screen composition unit＞

note)
All are displayed in width x height (units).

About scrolling units

Sega Saturn hardware also includes a feature that handles scrolling in dot units (called bitmaps) rather than in cells, but this manual does not explain this.
However, functions that support some scrolling functions, including bitmaps, are included in the SGL library, and these functions are briefly explained in the "Function Reference in the Reference Manual".
For some functions including bitmap mode, please refer to “HARDWARE MANUAL vol.2” and “Function Reference of Reference Manual”.

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★ SGL User's Manual ★ PROGRAMMER'S TUTORIAL
Copyright SEGA ENTERPRISES, LTD., 1997