Fix graphics format: Difference between revisions
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(Fixed image, added addressing details) |
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[[File:fixgfx.png|center]] | [[File:fixgfx.png|center]] | ||
The [[fix layer]] uses 8x8 pixels tiles, coded in a 4BPP linear format with mixed columns. Color indexes are coded by pairs and by columns from top to bottom. Note that the pixel positions are swapped in each byte (L/U) and that the first column is column A. | |||
One tile is 8 * 8 pixels / 2 pixels per byte = '''32 bytes'''. | |||
==Addressing== | |||
<pre> | |||
n...nHCLLL | |||
n: Tile number | |||
H: Half, 0 = first (right), 1 = second (left) | |||
C: Column in half, 0 = left, 1 = right | |||
L: Line in column | |||
</pre> | |||
{{Sig|2H1}} is "C". | |||
[[Category:Video system]] | [[Category:Video system]] | ||
Revision as of 14:43, 11 April 2016
The fix layer uses 8x8 pixels tiles, coded in a 4BPP linear format with mixed columns. Color indexes are coded by pairs and by columns from top to bottom. Note that the pixel positions are swapped in each byte (L/U) and that the first column is column A.
One tile is 8 * 8 pixels / 2 pixels per byte = 32 bytes.
Addressing
n...nHCLLL n: Tile number H: Half, 0 = first (right), 1 = second (left) C: Column in half, 0 = left, 1 = right L: Line in column
[[Signal names#{{{2}}}|2H1]] is "C".