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Diffstat (limited to 'man/environ.man')
| -rw-r--r-- | man/environ.man | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/man/environ.man b/man/environ.man new file mode 100644 index 00000000..502e965c --- /dev/null +++ b/man/environ.man @@ -0,0 +1,25 @@ +.TP +\fBDOOMWADDIR\fR, \fBDOOMWADPATH\fR +These environment variables provide paths to search for Doom .WAD files when +looking for a game IWAD file or a PWAD file specified with the `-file' option. +\fBDOOMWADDIR\fR specifies a single path in which to look for WAD files, +while \fBDOOMWWADPATH\fR specifies a colon-separated list of paths to search. +.TP +\fBPCSOUND_DRIVER\fR +When running in PC speaker sound effect mode, this environment variable +specifies a PC speaker driver to use for sound effect playback. Valid +options are "Linux" for the Linux console mode driver, "BSD" for the +NetBSD/OpenBSD PC speaker driver, and "SDL" for SDL-based emulated PC speaker +playback (using the digital output). +.TP +\fBOPL_DRIVER\fR +When using OPL MIDI playback, this environment variable specifies an +OPL backend driver to use. Valid options are "SDL" for an SDL-based +software emulated OPL chip, "Linux" for the Linux hardware OPL driver, +and "OpenBSD" for the OpenBSD/NetBSD hardware OPL driver. + +Generally speaking, a real hardware OPL chip sounds better than software +emulation; however, modern machines do not often include one. If +present, it may still require extra work to set up and elevated +security privileges to access. + |