ebiten/internal/hook/hook.go
2023-10-06 13:58:00 +09:00

88 lines
1.7 KiB
Go

// Copyright 2018 The Ebiten 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 hook
import (
"sync"
)
var m sync.Mutex
var onBeforeUpdateHooks []func() error
// AppendHookOnBeforeUpdate appends a hook function that is run before the main update function
// every tick.
func AppendHookOnBeforeUpdate(f func() error) {
m.Lock()
onBeforeUpdateHooks = append(onBeforeUpdateHooks, f)
m.Unlock()
}
func RunBeforeUpdateHooks() error {
m.Lock()
defer m.Unlock()
for _, f := range onBeforeUpdateHooks {
if err := f(); err != nil {
return err
}
}
return nil
}
var (
audioSuspended bool
onSuspendAudio func() error
onResumeAudio func() error
)
func OnSuspendAudio(f func() error) {
m.Lock()
onSuspendAudio = f
m.Unlock()
}
func OnResumeAudio(f func() error) {
m.Lock()
onResumeAudio = f
m.Unlock()
}
func SuspendAudio() error {
m.Lock()
defer m.Unlock()
if audioSuspended {
return nil
}
audioSuspended = true
if onSuspendAudio != nil {
return onSuspendAudio()
}
return nil
}
func ResumeAudio() error {
m.Lock()
defer m.Unlock()
if !audioSuspended {
return nil
}
audioSuspended = false
if onResumeAudio != nil {
return onResumeAudio()
}
return nil
}