OBJ file: Difference between revisions
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OBJ files | OBJ files contain the [[sprites]] graphics (equivalent to the [[C ROM]]s on [[:Category:cartridge systems|cartridge systems]]). Data is compressed however using a simple RLE compression removing runs with a value of 0x00000000. Once decompressed the format is described here: [[sprite graphics format]]. | ||
RLE compression. | |||
* First long word value is the compressed file length (/4-1). | |||
* The system works by checking single long words at a time. | |||
* When a 0x00000000 value is found it is stored and the next long word value is checked. If a non value value is found a fill of 0x000000 is created to match the value read. | |||
Example. | |||
compressed: | |||
0x00000007, 0x11111111, 0x00000000, 0x00000003, 0x22222222, 0x00000000, 0x00000000, 0x33333333, 0x44444444 | |||
decompressed: | |||
0x11111111, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x22222222, 0x00000000, 0x33333333, 0x44444444 | |||
[[Category:CD systems]] | [[Category:CD systems]] | ||
Revision as of 10:28, 8 December 2013
OBJ files contain the sprites graphics (equivalent to the C ROMs on cartridge systems). Data is compressed however using a simple RLE compression removing runs with a value of 0x00000000. Once decompressed the format is described here: sprite graphics format.
RLE compression.
- First long word value is the compressed file length (/4-1).
- The system works by checking single long words at a time.
- When a 0x00000000 value is found it is stored and the next long word value is checked. If a non value value is found a fill of 0x000000 is created to match the value read.
Example.
compressed:
0x00000007, 0x11111111, 0x00000000, 0x00000003, 0x22222222, 0x00000000, 0x00000000, 0x33333333, 0x44444444
decompressed:
0x11111111, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x22222222, 0x00000000, 0x33333333, 0x44444444