ml
71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package sound
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import (
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"github.com/inkyblackness/hacked/ss1/content/audio"
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"github.com/inkyblackness/hacked/ss1/content/audio/voc"
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"github.com/inkyblackness/hacked/ss1/resource"
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)
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// EffectCache retrieves audio samples stored as VOC files from a localizer and
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// keeps them cached until they are invalidated.
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type EffectCache struct {
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localizer resource.Localizer
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sounds map[resource.Key]audio.L8
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}
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// NewEffectCache returns a new instance.
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func NewEffectCache(localizer resource.Localizer) *EffectCache {
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cache := &EffectCache{
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localizer: localizer,
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sounds: make(map[resource.Key]audio.L8),
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}
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return cache
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}
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// InvalidateResources lets the cache remove any sounds from resources that are specified in the given slice.
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func (cache *EffectCache) InvalidateResources(ids []resource.ID) {
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for _, id := range ids {
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for key := range cache.sounds {
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if key.ID == id {
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delete(cache.sounds, key)
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}
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}
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}
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}
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func (cache *EffectCache) cached(key resource.Key) (audio.L8, error) {
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value, existing := cache.sounds[key]
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if existing {
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return value, nil
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}
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selector := cache.localizer.LocalizedResources(key.Lang)
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view, err := selector.Select(key.ID.Plus(key.Index))
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if err != nil {
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return audio.L8{}, err
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}
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if view.ContentType() != resource.Sound {
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return audio.L8{}, resource.ErrWrongType(key, resource.Sound)
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}
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reader, err := view.Block(0)
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if err != nil {
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return audio.L8{}, err
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}
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sound, err := voc.Load(reader)
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if err != nil {
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return audio.L8{}, err
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}
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cache.sounds[key] = sound
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return sound, nil
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}
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// Audio retrieves and caches the underlying sound.
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func (cache *EffectCache) Audio(key resource.Key) (audio.L8, error) {
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cached, err := cache.cached(key)
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if err != nil {
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return audio.L8{}, err
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}
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return cached, nil
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}
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