ikanatto weblog: W:ETソースコード朗読会　第二回

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April 15, 2005

■　W:ETソースコード朗読会　第二回

Reading the Source Code of W:ET #2

前回のおさらいと今回のねらい

前回まででソースコードを「読む」準備が出来ました。何を実際に読むかは、気分とコードの可読性次第ですが、今回は武器データを中心に実際見ていこうというお話です。武器なんか興味ないっ、というお方は今回のお話はすっ飛ばしてください。

武器ダメージ

とりあえず、皆さんが興味ある部分といったらこういうところなんでしょうか。早速見ていきましょう。でもどこを見ればよいのか―。最初はまずこの問題を解決していかなければいけません。

ソースコードを見る上で一番最初の、かつ難解な問題が、「どこにどんな機能を持ったコードが書かれているかを探し出す」ことです。ただぼーっとコードを眺めているだけでは始まりません。幸い、コードは役割によってファイルやフォルダごとに区切られています。最初はこのファイル名を手掛かりに開いて検索することが有効です。

では武器関係の情報はどこに書いてあるか調べましょう。基本的に私たちが扱うのは、gameフォルダのものです。なぜかは後々説明しますが、ゲームの基本的な処理はここで行われるため、と考えてください。このフォルダを開いて、武器っぽいファイルを探してください･･･。どうですか？g_weapon.cというファイルがありませんか？なんだかこれっぽいにおいがプンプンしますね。早速開いてみましょう。

とても長いテキストが開かれたと思います。では、軽く全体を眺めてください。読む必要はありません。わけのわからない文字が一杯並んでるなー程度で結構です。さて、それでは問題の武器の性能について言及している部分を探していきましょう。鋭い人はもう気がついているかと思いますが、2784行以降を見てください。G_GetWeaponDamageという関数が定義されています。関数名を見ると、 Get Weapon Damage、つまり武器のダメージに関する関数であり、中身を見れば武器ごとのダメージを戻り値とするものと予想がつきます。つまり、武器のダメージはここの数字によって決まっているのです。早速見ていきましょう。

Line 2884 in g_weapon.c:

int G_GetWeaponDamage( int weapon ) {
		switch (weapon) {
		default:
			return 1;
		case WP_KNIFE: 
			return 10;
		case WP_STEN: 
			return 14;
		case WP_CARBINE:
		case WP_GARAND:
		case WP_KAR98:
		case WP_K43:
			return 34;
		case WP_FG42: 
			return 15;
		case WP_LUGER:
		case WP_SILENCER:
		case WP_AKIMBO_LUGER:
		case WP_AKIMBO_SILENCEDLUGER:
		case WP_COLT:
		case WP_SILENCED_COLT:
		case WP_AKIMBO_COLT:
		case WP_AKIMBO_SILENCEDCOLT: 
		case WP_THOMPSON: 
		case WP_MP40: 
		case WP_MOBILE_MG42: 
		case WP_MOBILE_MG42_SET:
			return 18;
		case WP_FG42SCOPE: 
			return 30;
		case WP_GARAND_SCOPE: 
		case WP_K43_SCOPE: 
			return 50;
		case WP_SMOKE_MARKER: 
			return 140; // just enough to kill somebody standing on it
		case WP_MAPMORTAR: 
		case WP_GRENADE_LAUNCHER: 
		case WP_GRENADE_PINEAPPLE: 
		case WP_GPG40:
		case WP_M7: 
		case WP_LANDMINE: 
		case WP_SATCHEL:
			return 250;
		case WP_TRIPMINE: 
			return 300;
		case WP_PANZERFAUST: 
		case WP_MORTAR_SET: 
		case WP_DYNAMITE: 
			return 400;
	}
}

コード自体はswitch構文で構成された単純なものです。引数として渡された武器IDに応じてダメージを返すというものです。ちなみにここで使われている武器IDは便利です。どう便利なのかは後で紹介します。

さて、この関数を見るとダメージが一目瞭然です。ナイフは10ですか･･･、もうちょっとあってもいいのでは。他ステンが14、ライフル34、SMGとピストル18などや、空爆缶140、手榴弾250、パンツァー400などですね。ちなみに爆発物は「直撃」した場合のダメージです。「直撃」とは、インパクトの瞬間に距離が0の状態を指します。この中にトリップマインというものがありますが、一体なんでしょうね？気になりませんか。

弾の散らばり具合

ちなみにこの関数の次にこんな関数が定義されています。

Line 2837 in g_weapon.c:

float G_GetWeaponSpread( int weapon ) {
	switch (weapon) {
		case WP_LUGER:
		case WP_SILENCER:
		case WP_AKIMBO_LUGER:
		case WP_AKIMBO_SILENCEDLUGER:
			return 600;
		case WP_COLT:
		case WP_SILENCED_COLT:
		case WP_AKIMBO_COLT:
		case WP_AKIMBO_SILENCEDCOLT:
			return 600;
		case WP_MP40:
		case WP_THOMPSON:
			return 400;
		case WP_STEN:
			return 200;
		case WP_FG42SCOPE:
			return 200;
		case WP_FG42:
			return 500;
		case WP_GARAND:
		case WP_CARBINE:
		case WP_KAR98:
		case WP_K43:
			return 250;
		case WP_GARAND_SCOPE:
		case WP_K43_SCOPE:
			return 700;
		case WP_MOBILE_MG42:
		case WP_MOBILE_MG42_SET:
			return 2500;
	}

	G_Printf( "shouldn't ever get here (weapon %d)\n", weapon );
	// jpw
	return 0;	// shouldn't get here
}

構文は先程の関数とほとんど同じですが、こちらは何を定義してるのでしょうか。関数名を見ると、Get Weapon Spread(広がり)、弾の散らばり具合を定義しているものと思われます。具体的に見ると、ステンが200で最小ですから、小さい方が散らばりは少ないものと考えられます。そうすると、ステン＜ライフル＜SMG＜FG42＜ピストル＜狙撃銃(狙撃モードでない)＜立ちMGの順で散弾性が良いようです。意外なのはライフルの性能、かなり良いということです。それでも当たらないと嘆くあなたと私、照準を合わせる訓練を頑張りましょう。

まとめ

今回は、構文的にも内容的にも非常になじみやすい部分を紹介してみました。他にもダメージのように定数によって定義されているものはたくさんあります。移動速度、重力、火炎放射器の射程距離、地雷の数などなど。それらを見つけ出してにやりとするのも一つの楽しみかと思います。

投稿者 ikanatto : April 15, 2005 06:13 PM

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