mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
104 lines
2.7 KiB
Go
104 lines
2.7 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build example
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// +build example
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package main
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import (
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"bytes"
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"fmt"
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"log"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/audio"
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"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
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)
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const (
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screenWidth = 640
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screenHeight = 480
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sampleRate = 22050
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bytesPerSample = 4 // 2 channels * 2 bytes (16 bit)
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introLengthInSecond = 5
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loopLengthInSecond = 4
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)
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type Game struct {
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player *audio.Player
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audioContext *audio.Context
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}
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func (g *Game) Update() error {
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if g.player != nil {
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return nil
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}
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if g.audioContext == nil {
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g.audioContext = audio.NewContext(sampleRate)
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}
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// Decode an Ogg file.
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// oggS is a decoded io.ReadCloser and io.Seeker.
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oggS, err := vorbis.Decode(g.audioContext, bytes.NewReader(raudio.Ragtime_ogg))
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if err != nil {
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return err
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}
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// Create an infinite loop stream from the decoded bytes.
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// s is still an io.ReadCloser and io.Seeker.
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s := audio.NewInfiniteLoopWithIntro(oggS, introLengthInSecond*bytesPerSample*sampleRate, loopLengthInSecond*bytesPerSample*sampleRate)
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g.player, err = g.audioContext.NewPlayer(s)
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if err != nil {
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return err
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}
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// Play the infinite-length stream. This never ends.
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g.player.Play()
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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pos := g.player.Current()
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if pos > 5*time.Second {
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pos = (g.player.Current()-5*time.Second)%(4*time.Second) + 5*time.Second
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}
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msg := fmt.Sprintf(`TPS: %0.2f
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This is an example using
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audio.NewInfiniteLoopWithIntro.
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Intro: 0[s] - %[2]d[s]
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Loop: %[2]d[s] - %[3]d[s]
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Current: %0.2[4]f[s]`, ebiten.CurrentTPS(), introLengthInSecond, introLengthInSecond+loopLengthInSecond, float64(pos)/float64(time.Second))
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ebitenutil.DebugPrint(screen, msg)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return screenWidth, screenHeight
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}
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func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Audio Infinite Loop (Ebiten Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
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}
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}
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