ebiten/internal/ui/ui_js.go
2015-01-03 01:19:25 +09:00

92 lines
2.1 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 ui
import (
"github.com/gopherjs/gopherjs/js"
"github.com/gopherjs/webgl"
"github.com/hajimehoshi/ebiten/internal/opengl"
"time"
)
var canvas js.Object
var context *opengl.Context
func Use(f func(*opengl.Context)) {
f(context)
}
func DoEvents() {
time.Sleep(0)
}
func Terminate() {
// Do nothing.
}
func IsClosed() bool {
return false
}
func SwapBuffers() {
// Do nothing.
}
func init() {
ch := make(chan struct{})
js.Global.Get("window").Set("onload", func() {
close(ch)
})
<-ch
doc := js.Global.Get("document")
canvas = doc.Call("createElement", "canvas")
canvas.Set("width", 16)
canvas.Set("height", 16)
doc.Get("body").Call("appendChild", canvas)
doc.Get("body").Get("style").Set("backgroundColor", "#000")
webglContext, err := webgl.NewContext(canvas, &webgl.ContextAttributes{
Alpha: true,
PremultipliedAlpha: true,
})
if err != nil {
panic(err)
}
context = opengl.NewContext(webglContext)
// Make the canvas focusable.
canvas.Call("setAttribute", "tabindex", 1)
canvas.Get("style").Set("outline", "none")
canvas.Set("onkeydown", func(e js.Object) {
defer e.Call("preventDefault")
code := e.Get("keyCode").Int()
currentInput.keyDown(code)
})
canvas.Set("onkeyup", func(e js.Object) {
defer e.Call("preventDefault")
code := e.Get("keyCode").Int()
currentInput.keyUp(code)
})
}
func Start(width, height, scale int, title string) (actualScale int, err error) {
canvas.Set("width", width*scale)
canvas.Set("height", height*scale)
return scale, nil
}