extrans
Lighting and translucency effects.
Description
This program demonstrates how to use the lighting and
translucency functions. The first part of the example will
show a dark screen iluminated by a spotlight you can move
with your mouse. After a keypress the example shows the full
bitmap and the spotlight changes to be a reduced version of
the background with 50% of translucency.
The translucency effect is easy to do in all color depths.
However, the lighting effect has to be performed in a different
way depending on whether the screen is in 8bit mode or another
color depth. This is because additive drawing mode uses a
different set of routines for truecolor modes.
