Lucas de Vries
136 lines
2.8 KiB
ActionScript 3
136 lines
2.8 KiB
ActionScript 3
const double DROPOFF_FACTOR = 64.0;
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const double DROPOFF_FACTOR_SQ = DROPOFF_FACTOR * DROPOFF_FACTOR;
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final class SoundEntry {
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vec3d pos;
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double scale;
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};
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final class AmbienceGroup {
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map entries;
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SoundEntry@ active;
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const SoundSource@ source;
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Sound@ sound;
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double volume = 0;
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AmbienceGroup(const SoundSource& soundSource) {
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@source = soundSource;
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}
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void addEntry(int id, const vec3d& pos, double scale) {
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SoundEntry entry;
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entry.pos = pos;
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entry.scale = scale;
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entries.set(id, @entry);
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}
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void deleteEntry(int id) {
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entries.delete(id);
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}
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SoundEntry@ findNearest(const vec3d& to) {
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SoundEntry@ nearest;
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double nearDist = 0;
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map_iterator i = entries.iterator();
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SoundEntry@ entry;
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while(i.iterate(@entry)) {
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double d = to.distanceToSQ(entry.pos);
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if(d < entry.scale * entry.scale * DROPOFF_FACTOR_SQ && (nearest is null || d < nearDist)) {
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@nearest = entry;
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nearDist = d;
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}
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}
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return nearest;
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}
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void tick(double time, const vec3d& pos) {
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auto@ entry = findNearest(pos);
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if(entry !is active) {
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if(active !is null && sound !is null) {
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if(volume > 0) {
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volume = max(volume - time, 0.0);
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sound.volume = volume * sqrt(active.scale);
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}
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else {
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sound.pause();
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@active = null;
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}
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}
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else {
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@active = entry;
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}
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}
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else if(active !is null) {
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if(sound is null) {
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@sound = source.play(entry.pos, loop=true, pause=true, priority=true);
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if(sound !is null) {
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sound.minDistance = entry.scale;
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sound.maxDistance = entry.scale * DROPOFF_FACTOR;
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sound.volume = 0;
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sound.resume();
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volume = 0;
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}
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}
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else if(volume < 1.0) {
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if(volume == 0.0) {
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sound.position = entry.pos;
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sound.minDistance = entry.scale;
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sound.maxDistance = entry.scale * DROPOFF_FACTOR;
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sound.resume();
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}
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volume = min(1.0, volume+time);
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sound.volume = volume * sqrt(entry.scale);
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}
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}
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}
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void clear() {
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if(sound !is null)
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sound.stop();
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entries.deleteAll();
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}
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};
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Mutex mtx;
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dictionary ambientSounds;
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void addAmbientSource(string sound, int id, vec3d pos, double scale) {
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Lock lck(mtx);
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AmbienceGroup@ group;
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if(!ambientSounds.get(sound, @group)) {
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const auto@ source = getSound(sound);
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if(source is null)
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return;
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@group = AmbienceGroup(source);
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ambientSounds.set(sound, @group);
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}
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group.addEntry(id, pos, scale);
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}
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void removeAmbientSource(int id) {
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Lock lck(mtx);
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AmbienceGroup@ group;
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dictionary_iterator i = ambientSounds.iterator();
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while(i.iterate(@group))
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group.deleteEntry(id);
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}
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void tick(double time) {
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Lock lck(mtx);
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AmbienceGroup@ group;
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dictionary_iterator i = ambientSounds.iterator();
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while(i.iterate(@group))
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group.tick(time, cameraPos);
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}
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void deinit() {
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Lock lck(mtx);
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AmbienceGroup@ group;
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dictionary_iterator i = ambientSounds.iterator();
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while(i.iterate(@group))
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group.clear();
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}
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