I always liked to play the Missile Defense game where you defended a city from incoming missiles with missiles of your own. And that was ages ago when I was learning GWBASIC.

Presenting my version, completed in a coding marathon in just over 22 hours, Skyline!

AKA, My first game^TM!

{"name":"605037","src":"http:\/\/static.allegro.cc\/image\/cache\/2\/4\/24527a09650b07e2211aa071b3477751.png","w":812,"h":632,"tn":"http:\/\/static.allegro.cc\/image\/cache\/2\/4\/24527a09650b07e2211aa071b3477751"}
{"name":"605038","src":"http:\/\/static.allegro.cc\/image\/cache\/8\/b\/8bee644a4ca5b90044579d56ee137a3d.png","w":812,"h":632,"tn":"http:\/\/static.allegro.cc\/image\/cache\/8\/b\/8bee644a4ca5b90044579d56ee137a3d"}
{"name":"605039","src":"http:\/\/static.allegro.cc\/image\/cache\/e\/e\/ee35967486ff037c964c92724c5bbb2b.png","w":812,"h":632,"tn":"http:\/\/static.allegro.cc\/image\/cache\/e\/e\/ee35967486ff037c964c92724c5bbb2b"}

Skyline.7z (Binary + DLL's + Resources)
SkylineSRC.zip (Source {depends on my Eagle lib})
(Extract to a new folder)

Get 7-zip here if you need it...

I can't get png's or jpg's to load magic pink properly and I don't know why... They don't masked_blit properly but show up as hot pink instead of transparent like they should be. Ideas?

Also, I'm genuinely interested in constructive criticism about my source code - structure / best practices / whatever, as detailed as you would like to be.

Edit
Forgot to mention, the game is fully configurable through Data/Config.txt and Data/Cities.txt. The easy/medium/hard settings definitely need to be tweaked for better gameplay, but I don't have time today.

The first city listed in Data/Cities.txt is the one that will be loaded - haven't finished a proper menu screen yet.

Edit2
Update! New screenshots! Better colors! ++GradientCircles()!

SkylineEXE.7z (updated exe)
(extract over the folder where you extracted Skyline.7z)

JPGs and magic pink — in other words, lossy compression and a single transparency color — don't mix.
As for PNGs, there's probably a color conversion issue. There's no reason to use magic pink with them, since they come with their own alpha.

I don't want to use translucent blending with A4 - no hwaccel.

Not yet, but I'll see if I can find some good effects and/or music.

Try using this config.txt file in the Data folder instead of the one that came with it and try the hard difficulty level.

Like I said, config.txt lets you change every aspect of the game.

The cursor is red when you can't fire yet, and green when you can.

IIRC, you don't have to (with the right color conversion mode).

I never liked the Missile Defense kind of games but congratulations on finishing a game!.

Is that lib available? I'd run the game, but I'm rarely ever in Windows.

I'd comment on the code, but C++ makes me sick and I'm trying to forget Allegro 4 in order to save space for more important things.

I think there is a typo... Wasn't in 22 hours, but 22 minutes... Sorry man, I thought you was able to come up with something much better than that . I mean, your collision detection test is 3 times better than this, and it's not a game...

The explosions (big spots) are always white here... And how I change the city background?. And the bullets are just white pixels, not like in your images. Have you used Photoshop Edgar?

The collision detection is fine, I'm just saying that I remember that you sent an example or a test of some kind of collision detection with some physics too (gravity) to someone and I keep it opened longer than this game... There was a big ball bouncing or something like that.

Ohh, I missed that, now looks much better.

Oh I see.

It's fine man, keep improving it until you use 3D meshes and upload it to the Xbox Live and add a multiplayer section, with 32 players 16 being the attackers and 16 being the city protectors, and create nuclear booms that could explode the entire city in just minutes, and... and... Well... That's it.

Thanks! No problem.

Okay, so, I've got the Windows build of my Eagle library working pretty well, so now for the *NIX build.

First off, what's with *.so files? Why are there more than one for the same library? Is one the archive to link to, and the other the shared library to be loaded at runtime?

I'm trying to figure out what I should be creating for my library, but there are so many different .so files I don't know what to do.

Is this right?

gcc -shared -Wl,-soname,libmylibrary.so.1 -o libmylibrary.so $(OBJS)

What does that even do? Which one do you link to, and which one is the equivalent of the Window's 'dll'?

And what's with the numbering scheme? Are those supposed to be version numbers?

No, the names are backwards - it should be :

gcc -shared -Wl,-soname,libmylib.so.majorversion -o libmylib.so.majorversion.minorversion $(OBJS)

And then you create symbolic links :

ln -sf libmylib.so.majorversion.minorversion libmylib.so.majorversion
ln -sf libmylib.so.majorversion libmylib.so

And that allows you to link the currently symlinked real .so file (libmylib.so.majorversion.minorversion) by linking with the symlink instead (libmylib.so {-lmylib}).

Yeah, if you get behind, it's hard to catch back up when your own missiles are blowing up right next to your launcher. In the original game, it was only one missile every 10 seconds or so, and you had several attempts to shoot it down before it hit your city. I will adjust the config file sometime soon so that there is a better range of difficulty, I just haven't had time yet.

@Matthew
Well, it took almost a week, but I finally have a working build system for my Eagle library. And, an almost working build for Skyline on *nix. You have to static link it for now because my dynamic .so files aren't working quite right just yet.

So, if anyone wants to build Skyline themselves, now they can.
Steps :

mkdir Eagle
cd Eagle
svn checkout "http://svn.code.sf.net/p/eaglegui/code/trunk eaglegui-code"
(sudo) (mingw32-)make install STATICLINK=1
cd ..
mkdir Skyline
cd Skyline
svn checkout "http://svn.code.sf.net/p/skylinedefense/code/trunk skylinedefense-code"
(mingw32-)make STATICLINK=1
(./)Skyline_static(.exe)

TL;DR:
Build Skyline yourself! Contribute patches to Eagle or Skyline if you want to! Now that I have the build systems mostly done, I can get back to working on the programs! So maybe I'll have an update soon.