Sound refactor and improvements (luanti-org#12764)

Author: Desour

LICENSE.txt

@@ -83,6 +83,8 @@ SmallJoker:
 DS:
   games/devtest/mods/soundstuff/textures/soundstuff_bigfoot.png
   games/devtest/mods/soundstuff/textures/soundstuff_jukebox.png
+  games/devtest/mods/soundstuff/textures/soundstuff_racecar.png
+  games/devtest/mods/soundstuff/sounds/soundstuff_sinus.ogg
   games/devtest/mods/testtools/textures/testtools_branding_iron.png
 
 License of Minetest source code

builtin/client/misc.lua

@@ -5,3 +5,14 @@ function core.setting_get_pos(name)
 	end
 	return core.string_to_pos(value)
 end
+
+
+-- old non-method sound functions
+
+function core.sound_stop(handle, ...)
+	return handle:stop(...)
+end
+
+function core.sound_fade(handle, ...)
+	return handle:fade(...)
+end

builtin/mainmenu/init.lua

@@ -28,6 +28,8 @@ local basepath = core.get_builtin_path()
 defaulttexturedir = core.get_texturepath_share() .. DIR_DELIM .. "base" ..
 					DIR_DELIM .. "pack" .. DIR_DELIM
 
+dofile(menupath .. DIR_DELIM .. "misc.lua")
+
 dofile(basepath .. "common" .. DIR_DELIM .. "filterlist.lua")
 dofile(basepath .. "fstk" .. DIR_DELIM .. "buttonbar.lua")
 dofile(basepath .. "fstk" .. DIR_DELIM .. "dialog.lua")

builtin/mainmenu/misc.lua

@@ -0,0 +1,6 @@
+
+-- old non-method sound function
+
+function core.sound_stop(handle, ...)
+	return handle:stop(...)
+end

doc/client_lua_api.md

@@ -754,9 +754,9 @@ Call these functions only at load time!
 * `minetest.sound_play(spec, parameters)`: returns a handle
     * `spec` is a `SimpleSoundSpec`
     * `parameters` is a sound parameter table
-* `minetest.sound_stop(handle)`
+* `handle:stop()` or `minetest.sound_stop(handle)`
     * `handle` is a handle returned by `minetest.sound_play`
-* `minetest.sound_fade(handle, step, gain)`
+* `handle:fade(step, gain)` or `minetest.sound_fade(handle, step, gain)`
     * `handle` is a handle returned by `minetest.sound_play`
     * `step` determines how fast a sound will fade.
       Negative step will lower the sound volume, positive step will increase

doc/lua_api.md

@@ -994,16 +994,21 @@ Only Ogg Vorbis files are supported.
 For positional playing of sounds, only single-channel (mono) files are
 supported. Otherwise OpenAL will play them non-positionally.
 
-Mods should generally prefix their sounds with `modname_`, e.g. given
+Mods should generally prefix their sound files with `modname_`, e.g. given
 the mod name "`foomod`", a sound could be called:
 
     foomod_foosound.ogg
 
-Sounds are referred to by their name with a dot, a single digit and the
-file extension stripped out. When a sound is played, the actual sound file
-is chosen randomly from the matching sounds.
+Sound group
+-----------
+
+A sound group is the set of all sound files, whose filenames are of the following
+format:
+`<sound-group name>[.<single digit>].ogg`
+When a sound-group is played, one the files in the group is chosen at random.
+Sound files can only be referred to by their sound-group name.
 
-When playing the sound `foomod_foosound`, the sound is chosen randomly
+Example: When playing the sound `foomod_foosound`, the sound is chosen randomly
 from the available ones of the following files:
 
 * `foomod_foosound.ogg`
@@ -1012,20 +1017,111 @@ from the available ones of the following files:
 * (...)
 * `foomod_foosound.9.ogg`
 
-Examples of sound parameter tables:
+`SimpleSoundSpec`
+-----------------
+
+Specifies a sound name, gain (=volume), pitch and fade.
+This is either a string or a table.
+
+In string form, you just specify the sound name or
+the empty string for no sound.
+
+Table form has the following fields:
+
+* `name`:
+  Sound-group name.
+  If == `""`, no sound is played.
+* `gain`:
+  Volume (`1.0` = 100%), must be non-negative.
+  At the end, OpenAL clamps sound gain to a maximum of `1.0`. By setting gain for
+  a positional sound higher than `1.0`, one can increase the radius inside which
+  maximal gain is reached.
+  Furthermore, gain of positional sounds doesn't increase inside a 1 node radius.
+  The gain given here describes the gain at a distance of 3 nodes.
+* `pitch`:
+  Applies a pitch-shift to the sound.
+  Each factor of `2.0` results in a pitch-shift of +12 semitones.
+  Must be positive.
+* `fade`:
+  If > `0.0`, the sound is faded in, with this value in gain per second, until
+  `gain` is reached.
+
+`gain`, `pitch` and `fade` are optional and default to `1.0`, `1.0` and `0.0`.
+
+Examples:
+
+* `""`: No sound
+* `{}`: No sound
+* `"default_place_node"`: Play e.g. `default_place_node.ogg`
+* `{name = "default_place_node"}`: Same as above
+* `{name = "default_place_node", gain = 0.5}`: 50% volume
+* `{name = "default_place_node", gain = 0.9, pitch = 1.1}`: 90% volume, 110% pitch
+
+Sound parameter table
+---------------------
+
+Table used to specify how a sound is played:
+
+```lua
+{
+    gain = 1.0,
+    -- Scales the gain specified in `SimpleSoundSpec`.
+
+    pitch = 1.0,
+    -- Overwrites the pitch specified in `SimpleSoundSpec`.
+
+    fade = 0.0,
+    -- Overwrites the fade specified in `SimpleSoundSpec`.
+
+    start_time = 0.0,
+    -- Start with a time-offset into the sound.
+    -- The behavior is as if the sound was already playing for this many seconds.
+    -- Negative values are relative to the sound's length, so the sound reaches
+    -- its end in `-start_time` seconds.
+    -- It is unspecified what happens if `loop` is false and `start_time` is
+    -- smaller than minus the sound's length.
+
+    loop = false,
+    -- If true, sound is played in a loop.
+
+    pos = {x = 1, y = 2, z = 3},
+    -- Play sound at a position.
+    -- Can't be used together with `object`.
+
+    object = <an ObjectRef>,
+    -- Attach the sound to an object.
+    -- Can't be used together with `pos`.
+
+    to_player = name,
+    -- Only play for this player.
+    -- Can't be used together with `exclude_player`.
+
+    exclude_player = name,
+    -- Don't play sound for this player.
+    -- Can't be used together with `to_player`.
+
+    max_hear_distance = 32,
+    -- Only play for players that are at most this far away when the sound
+    -- starts playing.
+    -- Needs `pos` or `object` to be set.
+    -- `32` is the default.
+}
+```
+
+Examples:
 
 ```lua
 -- Play locationless on all clients
 {
     gain = 1.0,   -- default
-    fade = 0.0,   -- default, change to a value > 0 to fade the sound in
+    fade = 0.0,   -- default
     pitch = 1.0,  -- default
 }
 -- Play locationless to one player
 {
     to_player = name,
     gain = 1.0,   -- default
-    fade = 0.0,   -- default, change to a value > 0 to fade the sound in
+    fade = 0.0,   -- default
     pitch = 1.0,  -- default
 }
 -- Play locationless to one player, looped
@@ -1034,17 +1130,18 @@ Examples of sound parameter tables:
     gain = 1.0,  -- default
     loop = true,
 }
--- Play at a location
+-- Play at a location, start the sound at offset 5 seconds
 {
     pos = {x = 1, y = 2, z = 3},
     gain = 1.0,  -- default
-    max_hear_distance = 32,  -- default, uses a Euclidean metric
+    max_hear_distance = 32,  -- default
+    start_time = 5.0,
 }
 -- Play connected to an object, looped
 {
     object = <an ObjectRef>,
     gain = 1.0,  -- default
-    max_hear_distance = 32,  -- default, uses a Euclidean metric
+    max_hear_distance = 32,  -- default
     loop = true,
 }
 -- Play at a location, heard by anyone *but* the given player
@@ -1055,45 +1152,10 @@ Examples of sound parameter tables:
 }
 ```
 
-Looped sounds must either be connected to an object or played locationless to
-one player using `to_player = name`.
-
-A positional sound will only be heard by players that are within
-`max_hear_distance` of the sound position, at the start of the sound.
-
-`exclude_player = name` can be applied to locationless, positional and object-
-bound sounds to exclude a single player from hearing them.
-
-`SimpleSoundSpec`
------------------
-
-Specifies a sound name, gain (=volume) and pitch.
-This is either a string or a table.
-
-In string form, you just specify the sound name or
-the empty string for no sound.
-
-Table form has the following fields:
-
-* `name`: Sound name
-* `gain`: Volume (`1.0` = 100%)
-* `pitch`: Pitch (`1.0` = 100%)
-
-`gain` and `pitch` are optional and default to `1.0`.
-
-Examples:
-
-* `""`: No sound
-* `{}`: No sound
-* `"default_place_node"`: Play e.g. `default_place_node.ogg`
-* `{name = "default_place_node"}`: Same as above
-* `{name = "default_place_node", gain = 0.5}`: 50% volume
-* `{name = "default_place_node", gain = 0.9, pitch = 1.1}`: 90% volume, 110% pitch
-
-Special sound files
--------------------
+Special sound-groups
+--------------------
 
-These sound files are played back by the engine if provided.
+These sound-groups are played back by the engine if provided.
 
  * `player_damage`: Played when the local player takes damage (gain = 0.5)
  * `player_falling_damage`: Played when the local player takes
@@ -8804,7 +8866,10 @@ Used by `minetest.register_node`.
 
         footstep = <SimpleSoundSpec>,
         -- If walkable, played when object walks on it. If node is
-        -- climbable or a liquid, played when object moves through it
+        -- climbable or a liquid, played when object moves through it.
+        -- Sound is played at the base of the object's collision-box.
+        -- Gain is multiplied by `0.6`.
+        -- For local player, it's played position-less, with normal gain.
 
         dig = <SimpleSoundSpec> or "__group",
         -- While digging node.

doc/menu_lua_api.md

@@ -81,7 +81,7 @@ Filesystem
 * `core.sound_play(spec, looped)` -> handle
   * `spec` = `SimpleSoundSpec` (see `lua_api.md`)
   * `looped` = bool
-* `core.sound_stop(handle)`
+* `handle:stop()` or `core.sound_stop(handle)`
 * `core.get_video_drivers()`
   * get list of video drivers supported by engine (not all modes are guaranteed to work)
   * returns list of available video drivers' settings name and 'friendly' display name

games/devtest/mods/soundstuff/init.lua

@@ -3,3 +3,4 @@ local path = minetest.get_modpath("soundstuff") .. "/"
 dofile(path .. "sound_event_items.lua")
 dofile(path .. "jukebox.lua")
 dofile(path .. "bigfoot.lua")
+dofile(path .. "racecar.lua")