ebiten/ebitenutil/file_js.go
Hajime Hoshi 8f12dfc496 Use js.TypedArray
This is still WIP. There is a rendering issue on Wasm.
2018-07-06 02:48:51 +09:00

68 lines
1.6 KiB
Go

// Copyright 2015 Hajime Hoshi
//
// 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 ebitenutil
import (
"bytes"
"errors"
"fmt"
"github.com/gopherjs/gopherwasm/js"
)
type file struct {
*bytes.Reader
}
func (f *file) Close() error {
return nil
}
func OpenFile(path string) (ReadSeekCloser, error) {
var err error
var content js.Value
ch := make(chan struct{})
req := js.Global().Get("XMLHttpRequest").New()
req.Call("open", "GET", path, true)
req.Set("responseType", "arraybuffer")
req.Call("addEventListener", "load", func() {
defer close(ch)
status := req.Get("status").Int()
if 200 <= status && status < 400 {
content = req.Get("response")
return
}
err = errors.New(fmt.Sprintf("http error: %d", status))
})
req.Call("addEventListener", "error", func() {
defer close(ch)
err = errors.New(fmt.Sprintf("XMLHttpRequest error: %s", req.Get("statusText").String()))
})
req.Call("send")
<-ch
if err != nil {
return nil, err
}
data := make([]byte, content.Get("byteLength").Int())
arr := js.TypedArrayOf(data)
arr.Call("set", content)
arr.Release()
f := &file{bytes.NewReader(data)}
return f, nil
}