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- Doesn't seem to be an easy way to do cross platform incbin paths with the C preprocessor, so using /obj/all
RLE Decompress
Demonstrates using rle_decompress to load a compressed tile map into vram.
Map Data encoding
The Tile Map is converted to binary format (one map entry per byte) and encoded in sequential columns 20 tiles high.
- The column wise encoding is the
-transposeoption forpng2asset
The data is compressed using the gbcompress utility using the --alg=rle argument.
gbcompress --alg=rle map.bin map.bin.rle
Display
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.
Graphics
The tileset graphics are by GrafxKid under CC0 license: