SEGA SATURN DEVELOPER'S MANUAL

Color Lookup Table

A table that defines 16-bit 16-bit color code on VRAM.
When the color mode is used in the texture drawing command with the lookup table method, it is referenced as color data.
The pixel data of the character pattern is converted to a color code and written to the frame buffer.
The size is 20H (32) Byte and the boundary is 20H (32) Byte.
Referenced by the look-up table address instruction of the texture drawing command.

■ Gouraud shading table

A table defining four 16-bit RGB codes on VRAM.
Referenced when Gouraud shading processing is specified by color calculation in the part drawing command.
Pixel pixel data is subjected to Gouraud shading and written to the frame buffer.
The size is 8HByte and the boundary is 8HByte.
Referenced by the Gouraud shading table address instruction of the part drawing command.
Partial pixel data is limited to RGB code when applying glow shading. Results are not guaranteed for color bank codes.

■ Character pattern table

A table defining character pattern pixel data on VRAM.
Referenced by texture drawing command.
Pixel data is defined as 4, 8, 16bit / pixel color data according to the color mode specification.
The pixel data of the character pattern is added with the color bank in the color bank mode, converted in the color lookup table in the color lookup table mode, and written to the frame buffer as it is in the RGB mode.
Size is determined by character size and color mode. The boundary is 20H (32) Byte.
Referenced by the character address instruction of the texture drawing command.