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Mosaic

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Revision as of 19:10, 5 July 2023 by Xetheria (talk | contribs) (more detail on the latches)
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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. The horizontal mosaic latches remember the color of the top-leftmost pixel of each mosaicized block. The vertical mosaic latch remembers what the value of the PPU vertical scanline counter was at the top of each mosaicized block. [3]

Examples

Game Name Mosaic Usage Animated GIF
Final Fantasy III (US) when trying to select a disabled menu option mosaic FF3.gif
Final Fantasy Mystic Quest upon entering battles and before/after loading new sections of the map mosaic FFMQ.gif
Star Ocean upon entering every battle
Super Mario World after selecting and entering a level mosaic SMW.gif

References