Difference between revisions of "AGI/AGI256"

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(Changed credits for AGI256-2 and the wording of AGI256(-2)'s general description.)
(Moved most of the data to separate subpages.)
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== AGI256 ==
AGI256 is a hack on the original PC AGI interpreter v2.936 by Dark Minister.
AGI256 is a hack on the original PC AGI interpreter v2.936 by Dark Minister.
It adds 256-color background picture support to the AGI engine. It uses the default VGA palette.
It adds 256-color background picture support to the AGI engine. It uses the default VGA palette.
=== Implementation details ===
In the original PC AGI interpreter v2.936 the engine holds the color and priority/control
line information for each pixel in a 160x200 byte buffer. The color data for each pixel
is held in the byte's lower 4 bits and the priority/control line data is held in the upper
4 bits.
AGI256 extends this 160x200 byte buffer to a 320x200 byte buffer so that the 256-color
data is held in the right 160x200 half of the buffer and the original style 16-color and
priority/control line information is held in the left 160x200 half of the buffer.
== AGI256-2 ==
AGI256-2 is an extension to AGI256 by Brian Provinciano. It adds 256-color view (i.e. sprite)
support to AGI256.
=== Implementation details ===
As AGI256-2 is an extension to AGI256, all AGI256 implementation details apply here unless
otherwise noted.
AGI256-2 modifies the sprite drawing routine to handle non-RLE-encoded raw 256-color data.

Revision as of 13:10, 16 July 2007

AGI256 is a hack on the original PC AGI interpreter v2.936 by Dark Minister. It adds 256-color background picture support to the AGI engine. It uses the default VGA palette.

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