OBJ file: Difference between revisions
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* First long word value is the compressed file length (/4-1). | * First long word value is the compressed file length (/4-1). | ||
* The system works by checking single long words at a time. | * The system works by checking single long words at a time. | ||
* When a zero value is found it is stored and the next value is checked. | * When a zero value is found it is stored and the next value is checked. A fill of zero is created to match the value read unless it is zero. | ||
Example. | Example. | ||
Revision as of 10:32, 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 zero value is found it is stored and the next value is checked. A fill of zero is created to match the value read unless it is zero.
Example.
compressed:
0x00000007, 0x11111111, 0x00000000, 0x00000003, 0x22222222, 0x00000000, 0x00000000, 0x33333333, 0x44444444
decompressed:
0x11111111, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x22222222, 0x00000000, 0x33333333, 0x44444444