Recently I had to write a LAN game server/client for C-Dogs SDL. I was surprised at how little information was available, so I thought I might document my solution here.

The Problem: Which IP to connect to?

Most people who have made, or attempted to make, network-multiplayer games will know that there are two ways to get two game instances to connect to each other:

1. Directly, by entering the IP address of the other game instance, or
2. Using an online “server list”, which is basically a list of IP addresses constantly updated

Most “game server browsers” actually download lists from several known locations, a fancy way of doing no. 2. But no. 2 boils down to picking an IP from a list, which the game then uses to connect to directly anyway - no. 1. The point is: to connect two games, you need the IP address.

_{In ages past there were dial-up modems where you could connect using phone numbers, or IPX which is similar to IP but has different addresses. The protocols have changed but the problem is the same.}

But how do games see each other on a LAN? Somehow many LAN-enabled games can scan and find servers running on a LAN, and avoid having to enter IP addresses manually. They also do this without having to access a remote server list.

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The latest release of C-Dogs SDL is ostensibly about the addition of deathmatch mode, and although it was the original goal and most notable feature, development took twice as long as previous releases, and largely for one reason: ammo. Before this, C-Dogs didn’t have ammo, or in other words, C-Dogs had infinite ammo. How could ammo be that hard to implement; surely it’s just an extra counter? I though the same, but I soon realised this:

Ammo is a resource.

And that leads to a heap of things related to resource management. The player must now contend with many more decisions:

• Which gun should I use? (some guns have rarer ammo)
• How should I engage enemies? (close-up saves ammo but is riskier; farther is safer but wastes ammo)
• Should I run away altogether and save ammo?
• Should I explore, and gamble on finding more ammo or having to use it up on new enemies?

And as a designer, you now have to contend with:

• Making sure the player is not too starved, or over-supplied
• Resetting the player with the right amount of ammo at key points
• Being careful not to railroad the player into a few play styles due to ammo supply

Of course there are great rewards for implementing ammo. It adds a layer of depth via the decision-making. It gives players an incentive to use different guns, as overusing their favourites will make them run out of ammo. But it’s also an entire game mechanic, and for one that’s so old and common, it’s surprisingly hard to get right.

Games like these are too easy with lots of ammo, too hard without. Ammo placement can make or break a map.

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Music in games is often relegated to the background, little more than filling the silence, pasted on as an afterthought. Recently I’ve contribute to the open source match-3 puzzle game FreeBlocks, and the surprising quality of the music reminded me of the value of music, that it can not only enhance but elevate the game to new heights.

Good music

But first let me show an example of music done right: the main theme of Enter the Dragon. I love music but there’s so much bad and badly-used music out there, and most people don’t care. I have a depressing anecdote where a jazz musician played a gig for a large dinner party, and received the following feedback from the client:

You guys were perfect! We hardly noticed you were playing.

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Many open source projects are supported by bounties - cash rewards for specific work done. Have you ever wondered about doing so for games? Well I did, and tried it with C-Dogs SDL, and it was awesome.

The Bounty

A month or so ago I looked into open source bounties. I knew that for very popular projects, businesses used bounties to fund the development of features. The sum of self-interested funding improved the overall project, benefiting all users.

But not all projects are in this enviable place. Open source projects, like many things, follow a power law distribution: there are a few that get outsize attention, and a vast majority of mediocre ones languishing in one form or another. C-Dogs SDL is one of them, which gets a few drive-by contributions, but is mostly worked on by me alone. Will bounties help here, by attracting eyeballs, or even contributors who get things done?

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This will be a personal blog of sorts, where I talk about game dev and related stuff, that’s not project specific. When people want to find out about what I’m up to or what I can collaborate on, I can point them here.