Mirrorlandia_minetest/minetest
1
0
Fork 1
mirror of https://github.com/minetest/minetest.git synced 2024-11-27 10:03:45 +01:00
Code Issues Packages Projects Releases Wiki Activity

Clean up sound_fade (#10119)

Browse Source 
Add proper documentation and correct gain reduction calculations.

Co-authored-by: hecktest <>
This commit is contained in:
hecks 2020-08-19 19:26:37 +02:00 committed by GitHub
parent 649211bf27
commit 5bda36143f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 35 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
doc/lua_api.txt
View File

@ -5238,9 +5238,12 @@ Sounds
* `minetest.sound_fade(handle, step, gain)` * `minetest.sound_fade(handle, step, gain)`
* `handle` is a handle returned by `minetest.sound_play` * `handle` is a handle returned by `minetest.sound_play`
* `step` determines how fast a sound will fade. * `step` determines how fast a sound will fade.
Negative step will lower the sound volume, positive step will increase The gain will change by this much per second,
the sound volume. until it reaches the target gain.
Note: Older versions used a signed step. This is deprecated, but old
code will still work. (the client uses abs(step) to correct it)
* `gain` the target gain for the fade. * `gain` the target gain for the fade.
Fading to zero will delete the sound.
Timing Timing
------ ------

53
src/client/sound_openal.cpp
View File

@ -337,14 +337,12 @@ private:
}; };
std::unordered_map<int, FadeState> m_sounds_fading; std::unordered_map<int, FadeState> m_sounds_fading;
float m_fade_delay;
public: public:
OpenALSoundManager(SoundManagerSingleton *smg, OnDemandSoundFetcher *fetcher): OpenALSoundManager(SoundManagerSingleton *smg, OnDemandSoundFetcher *fetcher):
m_fetcher(fetcher), m_fetcher(fetcher),
m_device(smg->m_device.get()), m_device(smg->m_device.get()),
m_context(smg->m_context.get()), m_context(smg->m_context.get()),
m_next_id(1), m_next_id(1)
m_fade_delay(0)
{ {
infostream << "Audio: Initialized: OpenAL " << std::endl; infostream << "Audio: Initialized: OpenAL " << std::endl;
} }
@ -616,39 +614,46 @@ public:
void fadeSound(int soundid, float step, float gain) void fadeSound(int soundid, float step, float gain)
{ {
m_sounds_fading[soundid] = FadeState(step, getSoundGain(soundid), gain); // Ignore the command if step isn't valid.
if (step == 0)
return;
float current_gain = getSoundGain(soundid);
step = gain - current_gain > 0 ? abs(step) : -abs(step);
if (m_sounds_fading.find(soundid) != m_sounds_fading.end()) {
auto current_fade = m_sounds_fading[soundid];
// Do not replace the fade if it's equivalent.
if (current_fade.target_gain == gain && current_fade.step == step)
return;
m_sounds_fading.erase(soundid);
}
gain = rangelim(gain, 0, 1);
m_sounds_fading[soundid] = FadeState(step, current_gain, gain);
} }
void doFades(float dtime) void doFades(float dtime)
{ {
m_fade_delay += dtime; for (auto i = m_sounds_fading.begin(); i != m_sounds_fading.end();) {
FadeState& fade = i->second;
assert(fade.step != 0);
fade.current_gain += (fade.step * dtime);
if (m_fade_delay < 0.1f) if (fade.step < 0.f)
return; fade.current_gain = std::max(fade.current_gain, fade.target_gain);
float chkGain = 0;
for (auto i = m_sounds_fading.begin();
i != m_sounds_fading.end();) {
if (i->second.step < 0.f)
chkGain = -(i->second.current_gain);
else else
chkGain = i->second.current_gain; fade.current_gain = std::min(fade.current_gain, fade.target_gain);
if (chkGain < i->second.target_gain) { if (fade.current_gain <= 0.f)
i->second.current_gain += (i->second.step * m_fade_delay);
i->second.current_gain = rangelim(i->second.current_gain, 0, 1);
updateSoundGain(i->first, i->second.current_gain);
++i;
} else {
if (i->second.target_gain <= 0.f)
stopSound(i->first); stopSound(i->first);
else
updateSoundGain(i->first, fade.current_gain);
// The increment must happen during the erase call, or else it'll segfault.
if (fade.current_gain == fade.target_gain)
m_sounds_fading.erase(i++); m_sounds_fading.erase(i++);
else
i++;
} }
} }
m_fade_delay = 0;
}
bool soundExists(int sound) bool soundExists(int sound)
{ {