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gbdk-2020

GameBoy Development Kit
download: https://git.y1.nz/archives/gbdk.tar.gz
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gbdk-lib/examples/cross-platform/rle_map/Readme.md

      1 
      2 RLE Decompress
      3 ============
      4 
      5 Demonstrates using rle_decompress to load a compressed tile map into vram.
      6 
      7 ## Map Data encoding
      8 The Tile Map is converted to binary format (one map entry per byte) and encoded in sequential **columns** 20 tiles high.
      9 - The column wise encoding is the `-transpose` option for `png2asset`
     10 
     11 The data is compressed using the `gbcompress` utility using the `--alg=rle` argument.
     12 
     13 `gbcompress --alg=rle map.bin map.bin.rle`
     14 
     15 ## Display
     16 As the program scrolls, a new column is drawn once for every 8 pixels scrolled. The Tile Map data is decoded 20 tiles at a time (column height) and rendered to the next (just barely off-screen) column on the right.
     17 
     18 ## Graphics
     19 The tileset graphics are by GrafxKid under CC0 license:
     20 
     21 https://opengameart.org/content/cave-tileset-4
     22

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