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Background
From SnesLab
A Background is a layer of tiles, mapped and possibly scrolled, that usually appears behind the sprite layer. The SNES supports up to four simultaneous backgrounds, conventionally named:
throughout the official Super Nintendo development manual. The following table describes which background layers support which capabilities in the various background modes. For an explanation of what the enclosed numerics on the right mean, see the legend below (if a layer does not support that function, the cell is left blank).
Mode | # of Layers Displayed | Layer | # of Tile Dots | # of Tile Colors | # of Palettes | # of Colors Per Layer | Function | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | max 4 | BG1 | 8x8 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ||||
BG2 | or | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ||||||
BG3 | 16x16 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ||||||
BG4 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | |||||||
1 | max 3 | BG1 | " | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ||||
BG2 | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | |||||||
BG3 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | |||||||
2 | max 2 | BG1 | " | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ⑪ | |||
BG2 | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ⑪ | ||||||
3 | max 2 | BG1 | " | 256 | 1 | 256 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ | ⑩ | |||
BG2 | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | |||||||
4 | max 2 | BG1 | " | 256 | 1 | 256 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ | ⑩ | ⑪ | ||
BG2 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑥ | ⑦ | ⑧ | ⑩ | ⑪ | ||||||
5 | max 2 | BG1 | " | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑦ | ⑧ | ⑫ | |||||
BG2 | 4 | 8 | 32 | ① | ② | ③ | ⑤ | ⑦ | ⑧ | ⑫ | ||||||||
6 | 1 | BG1 | 16x8 | 16 | 8 | 128 | ① | ② | ③ | ⑤ | ⑦ | ⑧ | ⑪ | ⑫ | ||||
7 | 1 | BG1 | 8x8 | 256 | 1 | 256 | ① | ③ | ④ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ | ⑩ | |||
EXT BG | 1 | BG1 | 8x8 | 128 | 1 | 128 | ① | ③ | ④ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ | ⑩ |
Legend
① Horizontal/Vertical Scrolling (each layer)
② Horizontal/Vertical Flip (each tile)
③ Mosaic
④ Rotate, Enlarge, Shrink (affine transformations)
⑤ Window Mask
⑦ Fixed Color Addition/Subtraction
⑧ Color Window
References
- Appendix A-5 of Book I of the official Super Nintendo development manual
- Chapter 3, "Background (BG)" on page 2-3-1 of Book I, lbid