ebiten/audio/stopwatch.go

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// Copyright 2024 The Ebitengine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package audio
import (
"sync"
"time"
)
type stopwatch struct {
duration time.Duration
lastStarted time.Time
running bool
m sync.Mutex
}
func (s *stopwatch) start() {
s.m.Lock()
defer s.m.Unlock()
if s.running {
return
}
s.lastStarted = time.Now()
s.running = true
}
func (s *stopwatch) stop() {
s.m.Lock()
defer s.m.Unlock()
if !s.running {
return
}
s.duration += time.Since(s.lastStarted)
s.running = false
}
func (s *stopwatch) current() time.Duration {
s.m.Lock()
defer s.m.Unlock()
d := s.duration
if s.running {
d += time.Since(s.lastStarted)
}
return d
}
func (s *stopwatch) reset() {
s.m.Lock()
defer s.m.Unlock()
s.duration = 0
s.lastStarted = time.Time{}
s.running = false
}