I was recently reading a brilliant post A first-person engine in 265 lines by Hunter Loftis, and instantly wanted to port it to Perl. After doing half of work, though, I figured out that the original code uses alpha blending technique to achieve wall shading, rain, and drawing images with 8-bit transparency channel.

I've used Prima to write the port, even though it doesn't support alpha channel, because native x11 API doesn't do that. Goog…