I've recently gotten back into developing Allegro Legacy, a project I started a few years ago to see if it was possible to make a version of Allegro 4 that uses Allegro 5 as a set of drivers for the various hardware that Allegro 4 uses to make the library work.

In my initial work, I was able to make most everything functional, but users would be required to add a little extra code to make graphics actually render onto the screen.

Recently, I thought of a way to make Allegro Legacy a true drop-in replacement for Allegro 4 by emulating a display in a separate thread. The emulated display updates itself from the contents of screen at regular intervals. I was able to get this working, so I think Allegro Legacy is a lot more useful now as a way to run old Allegro 4 code.

I would consider this library to still be in a beta state. So far, I've tested all of the example programs. All but one (ex12bit) work as expected. There are still some things that need to be finished. Display switch modes aren't currently implemented. set_gfx_mode() can't set full screen modes yet. Probably some other things I'm not thinking of at the moment.

I'd appreciate it if others who are interested in this project could download and test this library out. I'd like to know if others can successfully build their Allegro 4 projects and have them function properly with Allegro Legacy. Links below:

• Allegro Legacy on GitHub

• Allegro Legacy R2 Source Package

The CMake generator for mingw needs a little tweaking. It doesn't allow for users to install allegro headers anywhere else than mingw/include, which is bad. Other than that it configured and generated okay.

This thread should stay open. So there.