Hardware Design and Representation of Graphics in Videogames: A Case Study, the Sega Saturn

Marco Liboà's article, published in the Transactions of the Digital Games Research Association (December 2019, Vol. 5 No. 1, pp. 1-43), examines how the Sega Saturn's hardware design supports and constrains the representation of graphics in games. The Saturn is chosen for its complex circuitry and for a period in which game graphics shifted from 2D to 3D. The study draws on a platform archive of games, Sega development documentation, emulators, and an original Saturn connected to a CRT TV, and it focuses on the Virtua Fighter series. The author argues that 3D space can be simulated with 2D background layers. The Saturn's two video display processors, VDP1 for sprites and polygons and VDP2 for background layers, are described as shaping how games look. The article also covers half-transparency, where the checkered mesh effect is widely used on the Saturn. It reports that the mesh effect looked close to true half-transparency on composite video cable and CRT TV setups. The author concludes that graphical techniques did not always advance linearly across a series. Dynamic lighting from the original Virtua Fighter was absent in its remake, and texture mapping and dynamic lighting were used together only in the second half of the console's life-cycle.