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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/mapformat.txt | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/doc/mapformat.txt b/doc/mapformat.txt new file mode 100644 index 000000000..5ee33c106 --- /dev/null +++ b/doc/mapformat.txt @@ -0,0 +1,75 @@ +I'll try to quickly document the newest block format in here (might contain +errors). Refer to the mapgen or minetestmapper script for the directory +structure and file naming. There are two sector namings possible, +sector/XXXXZZZZ and sector/XXX/ZZZ. + +There also exists files map_meta.txt and chunk_meta, that are used by the +generator. If they are not found or invalid, the generator will currently +behave quite strangely. + +The MapBlock file format (sectors2/XXX/ZZZ/YYYY): + +NOTE: Byte order is MSB first. + +u8 version +- map format version number, this one is version 17 + +u8 flags +- Flag bitmasks: + - 0x01: is_underground: Should be set to 0 if there will be no light + obstructions above the block. If/when sunlight of a block is updated and + there is no block above it, this value is checked for determining whether + sunlight comes from the top. + - 0x02: day_night_differs: Whether the lighting of the block is different on + day and night. Only blocks that have this bit set are updated when day + transforms to night. + - 0x04: lighting_expired: If true, lighting is invalid and should be updated. + If you can't calculate lighting in your generator properly, you could try + setting this 1 to everything and setting the uppermost block in every + sector as is_underground=0. I am quite sure it doesn't work properly, + though. + +zlib-compressed map data: +- content: + u8[4096]: content types + u8[4096]: param1 values + u8[4096]: param2 values + +zlib-compressed node metadata +- content: + u16 version (=1) + u16 count of metadata + foreach count: + u16 position (= p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X) + u16 type_id + u16 content_size + u8[content_size] misc. stuff contained in the metadata + +u16 mapblockobject_count +- always write as 0. +- if read != 0, just fail. + +foreach mapblockobject_count: + - deprecated, should not be used. Length of this data can only be known by + properly parsing it. Just hope not to run into any of this. + +u8 static object version: +- currently 0 + +u16 static_object_count + +foreach static_object_count: + u8 type (object type-id) + s32 pos_x * 1000 + s32 pos_y * 1000 + s32 pos_z * 1000 + u16 data_size + u8[data_size] data + +u32 timestamp +- Timestamp when last saved, as seconds from starting the game. +- 0xffffffff = invalid/unknown timestamp, nothing will be done with the time + difference when loaded (recommended) + +// END + |