From: Alexei Levenko <alexei DOT Levenko AT in DOT stud DOT tu-ilmenau DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Allegro shading, once again I'm lost
Date: Wed, 14 Jul 1999 15:39:42 +0200
Organization: TU Ilmenau
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[skipped]

In 8bit mode you have
	Color = ShadePalette[  BMP->line[y][x]  ] [ 0 ]

In 16bit mode you have
	double ShadeCoefficient;
	Color = BMP->line[y][x] * ShadeCoefficient;
or if you prefer fixed-point, then
	long ShadeCoefficient;
	Color = (BMP->line[y][x] * ShadeCoefficient) >> 8;