As it is written page 387 in the openGl programming guide,
it is possible to use stipple patterns which serves as mask
to simulate transparency in color index mode.
The problem is to have homogeneous pattern for any percent
of transparency, I have found for 11, 25, 33, 50 % of transparency
but is there any algorhytm which give an homogeneous pattern
for a specified transparency, or is there somewhere pre-calculated
patterns for 10, 20, 30, 40 % ?
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