From 2a2866bf65b8ffddf508acec6b0dc4741650dbb4 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 21 Dec 2020 18:35:06 +0900
Subject: [PATCH] audio: Use a null context on go2cpp

---
 audio/context_js.go                       | 58 +++++++++++++++++++++++
 audio/context_notjs.go                    | 21 ++++++++
 audio/contextimpl_oto.go => otocontext.go |  2 +-
 3 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 audio/context_js.go
 create mode 100644 audio/context_notjs.go
 rename audio/contextimpl_oto.go => otocontext.go (96%)

diff --git a/audio/context_js.go b/audio/context_js.go
new file mode 100644
index 000000000..1e5f796ff
--- /dev/null
+++ b/audio/context_js.go
@@ -0,0 +1,58 @@
+// Copyright 2020 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 audio
+
+import (
+	"io"
+	"syscall/js"
+	"time"
+)
+
+type nullContext struct {
+	sampleRate int
+}
+
+type nullPlayer struct {
+	sampleRate int
+}
+
+func (c *nullContext) NewPlayer() io.WriteCloser {
+	return &nullPlayer{
+		sampleRate: c.sampleRate,
+	}
+}
+
+func (c *nullContext) Close() error {
+	return nil
+}
+
+func (p *nullPlayer) Write(data []byte) (int, error) {
+	time.Sleep(time.Second * time.Duration(len(data)) / time.Duration(p.sampleRate*4))
+	return len(data), nil
+}
+
+func (p *nullPlayer) Close() error {
+	return nil
+}
+
+func newContextImpl(sampleRate int, initCh chan struct{}) context {
+	if js.Global().Get("go2cpp").Truthy() {
+		return &nullContext{
+			sampleRate: sampleRate,
+		}
+	}
+
+	return newOtoContext(sampleRate, initCh)
+}
diff --git a/audio/context_notjs.go b/audio/context_notjs.go
new file mode 100644
index 000000000..39d83cb96
--- /dev/null
+++ b/audio/context_notjs.go
@@ -0,0 +1,21 @@
+// Copyright 2020 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.
+
+// +build !js
+
+package audio
+
+func newContextImpl(sampleRate int, initCh chan struct{}) context {
+	return newOtoContext(sampleRate, initCh)
+}
diff --git a/audio/contextimpl_oto.go b/otocontext.go
similarity index 96%
rename from audio/contextimpl_oto.go
rename to otocontext.go
index 914641527..e9aece1c9 100644
--- a/audio/contextimpl_oto.go
+++ b/otocontext.go
@@ -21,7 +21,7 @@ import (
 	"github.com/hajimehoshi/oto"
 )
 
-func newContextImpl(sampleRate int, initCh chan struct{}) context {
+func newOtoContext(sampleRate int, initCh chan struct{}) *otoContext {
 	return &otoContext{
 		sampleRate: sampleRate,
 		initCh:     initCh,