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Difference between revisions of "AGI/Specifications/Other"
Added preliminary sections and information for AGI256 and AGI256-2.
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(Added preliminary sections and information for AGI256 and AGI256-2.) |
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Chunk4-Chunk7 Same as Chunk0-Chunk3 | Chunk4-Chunk7 Same as Chunk0-Chunk3 | ||
</pre> | </pre> | ||
==AGI256== | |||
AGI256 is a hack to AGI interpreter v2.936 to add 256-color picture resource support. | |||
The AGI256 hack was originally made by Dark Minister. | |||
AGI256 uses the unknown170(v) a.k.a. set_simple(v) command to load 256-color | |||
picture resources. The parameter v is the variable's number that holds the | |||
picture resource's number. | |||
Example of use: | |||
<pre> | |||
v123 = 10 | |||
unknown170(v123) | |||
</pre> | |||
That would load the picture resource number 10 as a 256-color picture resource. | |||
Any variable can be used with unknown170, v123 was just chosen for this example. | |||
===256-color picture resource format=== | |||
<pre> | |||
Data : Simply a raw 256-color 160x168 size picture, one byte per pixel. | |||
Length : Always 160*168*1 = 26880 bytes. | |||
Palette : Isn't saved in the file. Uses the default VGA palette. | |||
</pre> | |||
As AGI256 was hacked to a v2.936 AGI interpreter no compression is used on | |||
the picture resource data (Only v3 AGI interpreters use compression). | |||
==AGI256-2== | |||
AGI256-2 is an extension to AGI256 to further add 256-color view support. | |||
The AGI256-2 hack was originally made by Brian Provinciano. | |||
AGI256-2 uses a modified cel blitting routine so that it can handle view data | |||
that isn't run length encoded and has 256 colors. | |||
===256-color view resource format=== | |||
Like the v2 AGI view resources but with the following differences: | |||
* Starts with bytes 0x0F, 0xF0 | |||
** Can be used for detecting 256-color view resources | |||
* Doesn't support mirroring | |||
** Mirroring/Transparency byte is used solely for choosing the transparent color | |||
* Cel data is not run length encoded | |||
** Cel data is raw 256-color data, one byte per pixel | |||
*** NOTE though that 0x00 for a new line is still supported | |||