I'm not sure if DD 8.0 supports it, but do a search for translucency or alpha-blending. You can do it manually too.. just take each pixel and do something like this:

ForegroundPixel + BackgroundPixel /2 = NewPixel

(obviously doing that for the RG&B components seperately)

The above will give you 50% tranlucency. I had the formula for variable translucency somewhere, but I lost it when formated one of my hard drives. From what I remember, you take each color value and multiply it by a %. 1.0 for opaque, 0.0 for invisible, 0.5 for half-way, etc..

Edited by - A. Buza on October 3, 2000 7:13:24 PM

Hi there,

I use the following

        #define BLEND(src,dest,alpha)    (((alpha*(src-dest))>>8)+dest)#define BLEND50(src,dest,alpha)  ((src+dest)*0.5)    

Hope it helps.


Edited by - MButchers on October 4, 2000 6:35:16 AM

yes, it''s very CPU expensive.
if you want it to go faster you can either optimize it for MMX (i think there is a tutorial on gamedev), or use d3d, which of course requires a hardware accelerator.