Dragging Gunroar into 2014

[Ben Boeckel]

[ Originally posted to Reddit: 
<https://pay.reddit.com/r/d_language/comments/217fas/dragging_gunroar_into_2014/>. 
]

I got an itch recently and started to port my favorite game from 
ABA Games[1] to 2014: gunroar[1]. Currently, it has been ported 
to using Derelict3 rather than Kenta Cho's manual wrapping of SDL 
and OpenGL. It now uses SDL2 and D2 rather than the (apparently) 
very ancient dialect of D it used back in 2005.

When first starting out, the first problem was getting the code 
to build. I'm a CMake guy, and after looking around, I 
was…unsatisfied with the D support files I found (for various 
reasons). They all seemed to copy the C++ support files too 
closely which seemed unnecessary since dmd, ldc, and gdc are much 
closer to each other than many of the C++ compilers. They also 
all seem to have come from the scream make era when commands were 
in all caps, copied things around without realizing what they're 
there for (e.g., CMakeCompilerId.d.in is copied by most of them, 
but used by none and CMakeDCompilerABI.d is useless since what 
CMake looks for (compiled-in strings) isn't in the file), and 
were missing support for things like DEPFILE and such for proper 
dependency resolution. In this process, two patches were made 
that should help: one for Ninja[3] if LDC is used and one for 
CMake[4] so that you get proper recompilation when files change 
(other generators are not supported yet since I don't think 
anything else reads the -deps file format of LDC; GDC will work 
as-is since it's GCC-compatible here). Even without these 
patches, one-off builds will be correct, but incremental builds 
are not guaranteed.

After that was the fun of getting LDC to actually accept the 
code. Luckily its errors are helpful even for initiates to D (the 
only other time I've done things with D is poking the source of 
various ABA Games years ago also trying to get them to compile on 
Linux with mixed results). Other than issues with replacing the 
deprecated glu* function usages, (most) things work on my machine 
(Fedora x86_64). I'd be interested to know how things work on 
other platforms and setups.

Ultimately, I'd like to get some of these games on my tablet, so 
Android support is on the table (though help would be 
appreciated!). I've opened some issues for things on the 
repository already.

(The other ABA Games I'm interested in are Mu-cade and Torus 
Troopers, so those are on my list as well.)

[1]http://www.asahi-net.or.jp/~cs8k-cyu/games/index.html#windows
[2]https://github.com/mathstuf/abagames-gunroar
[3]https://github.com/martine/ninja/pull/721
[4]https://github.com/mathstuf/CMake/commit/9523d2a55c99fb0910531ae7160b099faeab6638