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Background: Difference between revisions

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(BG3 High Priority appears above sprite layer)
(official jargon)
 
(6 intermediate revisions by the same user not shown)
Line 19: Line 19:
|  ||  || BG4 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
|  ||  || BG4 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
|-
|-
| [[Mode 1|1]] || max 3 || BG1 || || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
| [[Mode 1|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 ||  ||  
|  ||  || BG2 ||  || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
Line 25: Line 25:
|  ||  || BG3 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
|  ||  || BG3 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
|-
|-
| [[Mode 2|2]] || max 2 || BG1 || || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ || ⑪ ||  
| [[Mode 2|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 ||  
|  ||  || BG2 ||  || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ || ⑪ ||  
|-
|-
| [[Mode 3|3]] || max 2 || BG1 || || 256 || 1 || 256 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ || ⑨ || ⑩ ||  ||  
| [[Mode 3|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 ||  ||  
|  ||  || BG2 ||  || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ ||  ||  
|-
|-
| [[Mode 4|4]] || max 2 || BG1 || || 256 || 1 || 256 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ || ⑨ || ⑩ || ⑪ ||  
| [[Mode 4|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 ||  
|  ||  || BG2 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ || ⑥ || ⑦ || ⑧ ||  || ⑩ || ⑪ ||  
|-
|-
| [[Mode 5|5]] || max 2 || BG1 || || 16 || 8 || 128 || ① || ② || ③ ||  || ⑤ ||  || ⑦ || ⑧ ||  ||  ||  || ⑫
| [[Mode 5|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
|  ||  || BG2 ||  || 4 || 8 || 32 || ① || ② || ③ ||  || ⑤ ||  || ⑦ || ⑧ ||  ||  ||  || ⑫
Line 55: Line 55:
③ [[Mosaic]]
③ [[Mosaic]]


④ Rotate, Enlarge, Shrink
④ Rotate, Enlarge, Shrink ([https://www.mathworks.com/discovery/affine-transformation.html affine transformations])


⑤ Window Mask
⑤ Window Mask


⑥ Screen Addition/Subtraction
⑥ [[Screen Addition/Subtraction]]


⑦ Fixed Color Addition/Subtraction
⑦ Fixed Color Addition/Subtraction
Line 67: Line 67:
⑨ [[Direct Color]]
⑨ [[Direct Color]]


⑩ Horizontal Pseudo 512
⑩ [[Horizontal Pseudo 512 Mode]]


⑪ [[Offset Change Mode]]
⑪ [[Offset Change Mode]]
Line 73: Line 73:
⑫ [[Horizontal 512 Mode]]
⑫ [[Horizontal 512 Mode]]


=== Reference ===
=== References ===
* [https://archive.org/details/SNESDevManual/book1/page/n199 Appendix A-5 of Book I] of the official Super Nintendo development manual
# [https://archive.org/details/SNESDevManual/book1/page/n199 Appendix A-5 of Book I] of the official Super Nintendo development manual
# Chapter 3, "Background (BG)" on [https://archive.org/details/SNESDevManual/book1/page/n62 page 2-3-1 of Book I], lbid


[[Category:Video]]
[[Category:Video]]
[[Category:Official Jargon]]

Latest revision as of 04:15, 18 August 2024

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

⑥ Screen Addition/Subtraction

⑦ Fixed Color Addition/Subtraction

⑧ Color Window

⑨ Direct Color

⑩ Horizontal Pseudo 512 Mode

⑪ Offset Change Mode

⑫ Horizontal 512 Mode

References

  1. Appendix A-5 of Book I of the official Super Nintendo development manual
  2. Chapter 3, "Background (BG)" on page 2-3-1 of Book I, lbid
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