// Copyright 2017 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 clock

import (
	"github.com/hajimehoshi/ebiten/internal/sync"
)

var (
	m     sync.Mutex
	valid bool
	frame int64
)

func IsValid() bool {
	m.Lock()
	v := valid
	m.Unlock()
	return v
}

func Inc() {
	m.Lock()
	valid = true
	frame++
	m.Unlock()
}

func Frame() int64 {
	m.Lock()
	n := frame
	m.Unlock()
	return n
}