Add Steam's Quake 3 Arena dir to game dirs on Windows.

code/qcommon/files.c

@@ -250,6 +250,7 @@ static	cvar_t		*fs_homepath;
 // Also search the .app bundle for .pk3 files
 static  cvar_t          *fs_apppath;
 #endif
+static	cvar_t		*fs_steampath;
 
 static	cvar_t		*fs_basepath;
 static	cvar_t		*fs_basegame;
@@ -748,6 +749,21 @@ long FS_SV_FOpenFileRead(const char *filename, fileHandle_t *fp)
 			fsh[f].handleSync = qfalse;
 		}
 
+		// Check fs_steampath too
+		if (!fsh[f].handleFiles.file.o && fs_steampath->string[0])
+		{
+			ospath = FS_BuildOSPath( fs_steampath->string, filename, "" );
+			ospath[strlen(ospath)-1] = '\0';
+
+			if ( fs_debug->integer )
+			{
+				Com_Printf( "FS_SV_FOpenFileRead (fs_steampath): %s\n", ospath );
+			}
+
+			fsh[f].handleFiles.file.o = Sys_FOpen( ospath, "rb" );
+			fsh[f].handleSync = qfalse;
+		}
+
 		if ( !fsh[f].handleFiles.file.o )
 		{
 			f = 0;
@@ -3280,6 +3296,10 @@ static void FS_Startup( const char *gameName )
 	fs_gamedirvar = Cvar_Get ("fs_game", "", CVAR_INIT|CVAR_SYSTEMINFO );
 
 	// add search path elements in reverse priority order
+	fs_steampath = Cvar_Get ("fs_steampath", Sys_SteamPath(), CVAR_INIT|CVAR_PROTECTED );
+	if (fs_steampath->string[0]) {
+		FS_AddGameDirectory( fs_steampath->string, gameName );
+	}
 	if (fs_basepath->string[0]) {
 		FS_AddGameDirectory( fs_basepath->string, gameName );
 	}

code/qcommon/q_shared.h

@@ -33,6 +33,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   #define CLIENT_WINDOW_MIN_TITLE 	"changeme2"
   #define HOMEPATH_NAME_UNIX		".foo"
   #define HOMEPATH_NAME_WIN		"FooBar"
+  #define STEAMPATH_NAME		"Foo Bar"
   #define HOMEPATH_NAME_MACOSX		HOMEPATH_NAME_WIN
   #define GAMENAME_FOR_MASTER		"foobar"	// must NOT contain whitespace
 //  #define LEGACY_PROTOCOL	// You probably don't need this for your standalone game
@@ -43,6 +44,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   #define CLIENT_WINDOW_MIN_TITLE 	"ioq3"
   #define HOMEPATH_NAME_UNIX		".q3a"
   #define HOMEPATH_NAME_WIN		"Quake3"
+  #define STEAMPATH_NAME		"Quake 3 Arena"
   #define HOMEPATH_NAME_MACOSX		HOMEPATH_NAME_WIN
   #define GAMENAME_FOR_MASTER		"Quake3Arena"
   #define LEGACY_PROTOCOL

code/qcommon/qcommon.h

@@ -1099,6 +1099,7 @@ FILE	*Sys_Mkfifo( const char *ospath );
 char	*Sys_Cwd( void );
 void	Sys_SetDefaultInstallPath(const char *path);
 char	*Sys_DefaultInstallPath(void);
+char	*Sys_SteamPath(void);
 
 #ifdef MACOS_X
 char    *Sys_DefaultAppPath(void);

code/sys/sys_unix.c

@@ -44,6 +44,9 @@ qboolean stdinIsATTY;
 // Used to determine where to store user-specific files
 static char homePath[ MAX_OSPATH ] = { 0 };
 
+// Used to store the Steam Quake 3 installation path
+static char steamPath[ MAX_OSPATH ] = { 0 };
+
 /*
 ==================
 Sys_DefaultHomePath
@@ -78,6 +81,31 @@ char *Sys_DefaultHomePath(void)
 	return homePath;
 }
 
+/*
+================
+Sys_SteamPath
+================
+*/
+char *Sys_SteamPath( void )
+{
+	// Disabled since Steam doesn't let you install Quake 3 on Mac/Linux
+#if 0
+	char *p;
+
+	if( ( p = getenv( "HOME" ) ) != NULL )
+	{
+#ifdef MACOS_X
+		char *steamPathEnd = "/Library/Application Support/Steam/SteamApps/common/" STEAMPATH_NAME;
+#else
+		char *steamPathEnd = "/.steam/steam/SteamApps/common/" STEAMPATH_NAME;
+#endif
+		Com_sprintf(steamPath, sizeof(steamPath), "%s%s", p, steamPathEnd);
+	}
+#endif
+
+	return steamPath;
+}
+
 /*
 ================
 Sys_Milliseconds

code/sys/sys_win32.c

@@ -42,6 +42,9 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 // Used to determine where to store user-specific files
 static char homePath[ MAX_OSPATH ] = { 0 };
 
+// Used to store the Steam Quake 3 installation path
+static char steamPath[ MAX_OSPATH ] = { 0 };
+
 #ifndef DEDICATED
 static UINT timerResolution = 0;
 #endif
@@ -126,6 +129,37 @@ char *Sys_DefaultHomePath( void )
 	return homePath;
 }
 
+/*
+================
+Sys_SteamPath
+================
+*/
+char *Sys_SteamPath( void )
+{
+	HKEY steamRegKey;
+
+	if (!RegOpenKeyEx(HKEY_CURRENT_USER, "Software\\Valve\\Steam", 0, KEY_QUERY_VALUE, &steamRegKey))
+	{
+		DWORD pathLen = MAX_OSPATH;
+
+		if (RegQueryValueEx(steamRegKey, "SteamPath", NULL, NULL, (LPBYTE)steamPath, &pathLen))
+			if (RegQueryValueEx(steamRegKey, "InstallPath", NULL, NULL, (LPBYTE)steamPath, &pathLen))
+				steamPath[0] = '\0';
+
+		if (steamPath[0])
+		{
+			if (pathLen == MAX_OSPATH)
+				pathLen--;
+
+			steamPath[pathLen] = '\0';
+
+			Q_strcat(steamPath, MAX_OSPATH, "\\SteamApps\\common\\" STEAMPATH_NAME );
+		}
+	}
+
+	return steamPath;
+}
+
 /*
 ================
 Sys_Milliseconds