AGI/AGI256

AGI256

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.

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 a hack on the original PC AGI interpreter v2.936 by Dark Minister and Brian Provinciano. It is an extension to the AGI256 adding 256-color sprites (Views in AGI engine terminology).

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.