package d2audio import ( "math/rand" "github.com/OpenDiablo2/OpenDiablo2/d2common/d2data/d2datadict" ) const assumedFPS = 25 // SoundEnvironment represents the audio environment for map areas type SoundEnvironment struct { environment *d2datadict.SoundEnvironRecord engine *SoundEngine bgm *Sound ambiance *Sound eventTimer float64 } // NewSoundEnvironment creates a SoundEnvironment using the given SoundEngine func NewSoundEnvironment(soundEngine *SoundEngine) SoundEnvironment { r := SoundEnvironment{ // Start with env NONE environment: d2datadict.SoundEnvirons[0], engine: soundEngine, } return r } // SetEnv sets the sound environment using the given record index func (s *SoundEnvironment) SetEnv(environmentIdx int) { if s.environment.Index != environmentIdx { newEnv := d2datadict.SoundEnvirons[environmentIdx] if s.environment.Song != newEnv.Song { if s.bgm != nil { s.bgm.Stop() } s.bgm = s.engine.PlaySoundID(newEnv.Song) } if s.environment.DayAmbience != newEnv.DayAmbience { if s.ambiance != nil { s.ambiance.Stop() } s.ambiance = s.engine.PlaySoundID(newEnv.DayAmbience) } s.environment = newEnv } } // Advance advances the sound engine and plays sounds when necessary func (s *SoundEnvironment) Advance(elapsed float64) { s.eventTimer -= elapsed if s.eventTimer < 0 { s.eventTimer = float64(s.environment.EventDelay) / assumedFPS snd := s.engine.PlaySoundID(s.environment.DayEvent) if snd != nil { pan := (rand.Float64() * 2) - 1 snd.SetPan(pan) } } }