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| − | '''Block mappings''' are used to arrange large amounts of 8x8 tiles into larger tiles (16x16, followed by 128x128 or 256x256). These larger tiles are then arranged into the level layout.
| + | #REDIRECT [[sega:Block mappings]] |
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| − | ==16x16 tiles==
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| − | ===Games===
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| − | *[[Sonic 1|Sonic the Hedgehog]]
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| − | *[[Sonic the Hedgehog 2]]
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| − | *[[Sonic 3 & Knuckles]]
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| − | *[[Sonic CD]]
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| − | *[[Sonic Crackers]]
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| − | | |
| − | ===Format===
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| − | 16x16 tiles consist of four [[Cell|8x8 tiles]], arranged in the shape:
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| − | {| class="prettytable"
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| − | | width="40px" align="center" | 0
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| − | | width="40px" align="center" | 1
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| − | |-
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| − | | width="40px" align="center" | 2
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| − | | width="40px" align="center" | 3
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| − | |}
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| − | Each 8x8 tile is represented by one word, which like all SEGA Genesis VDP pattern indices, is a bitmask of the form PCCY XAAA AAAA AAAA. P is the priority flag, CC is the palette line to use, X and Y indicate that the sprite should be flipped horizontally and vertically respectively, and AAA AAAA AAAA is the actual tile index, i.e. the VRAM offset of the pattern divided by $20.
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| − | ==128x128 tiles==
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| − | ===Games===
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| − | *[[Sonic the Hedgehog 2]]
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| − | *[[Sonic 3 & Knuckles]]
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| − | *[[Sonic Crackers]]
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| − | | |
| − | ===Format===
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| − | 128x128 tiles consist of sixty-four 16x16 tiles.
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| − | SSSS YXII IIII IIII
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| − | S=Solidity, Y=flipY, X=flipX, I=Index
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| − | Each 16x16 tile has a two-byte value with the format '''XYYY''', where '''YYY''' is the index number of the 16x16 tile to be displayed, and''' X''' is the [[solidity]] of the tile. These are possible values for''' X''':
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| − | =======================
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| − | value high low
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| − | =======================
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| − | 0 not not
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| − | 1 not top
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| − | 2 not l/r
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| − | 3 not all
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| − | 4 top not
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| − | 5 top top
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| − | 6 top l/r
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| − | 7 top all
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| − | 8 l/r not
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| − | 9 l/r top
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| − | A l/r l/r
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| − | B l/r all
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| − | C all not
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| − | D all top
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| − | E all l/r
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| − | F all all
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| − | Additionally, add the following values to '''YYY''' to change the display mode of the 16x16 tile:
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| − | 400 flip x
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| − | 800 flip y
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| − | C00 flip x+y
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| − | | |
| − | ==256x256 tiles==
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| − | ===Games===
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| − | *[[Sonic 1|Sonic the Hedgehog]]
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| − | *[[Sonic CD]]
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| − | | |
| − | ===Format===
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| − | Similar to 128x128 tiles. Values for '''X''' are:
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| − | ================
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| − | value solid
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| − | ================
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| − | 0 not
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| − | 2 top
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| − | 4 l/r
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| − | 6 all
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| − | 8 not
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| − | A top
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| − | C l/r
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| − | E all
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| − | Add the following values to '''XYYY''' to change the display mode:
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| − | 0800 flip x
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| − | 1000 flip y
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| − | 1800 flip x+y
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| − | [[Category:Data Formats]]
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