Mosaic

Mosaic is a screen pixellation effect. It can be enabled or disabled on a per-background basis via bits 0-3 of 2106h. For a given background, the color of the pixel at screen position (H,V) is:

output_color(H,V) = input_color(floor(H/size)*size, floor(V/size)*size)

where size is the value of bits 4-7 of 2106h plus one. Thus, the shaded output consists of a grid of solid-colored squares where each entire square's color matches that of its top-leftmost input pixel.

The first mosaic square's location is always (0,0). Sprites are unaffected by the mosaic filter.

The mosaic filter has a horizontal and vertical subsystem. [3]

Examples

Game Name	Mosaic Usage
Final Fantasy III (US)	when trying to select a disabled menu option
Star Ocean	upon entering every battle

References

• https://archive.org/details/SNESDevManual/book1/page/n63
• https://archive.org/details/SNESDevManual/book1/page/n116
• https://archive.org/details/SNESDevManual/book1/page/n201
• https://problemkaputt.de/fullsnes.htm#snesppubgcontrol
• [3] https://board.zsnes.com/phpBB3/viewtopic.php?p=204966#p204966