mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 19:58:54 +01:00
109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
// Copyright 2018 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 example jsgo
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"image"
|
|
_ "image/jpeg"
|
|
"log"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/gopherwasm/js"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
"github.com/hajimehoshi/ebiten/examples/resources/images"
|
|
"github.com/hajimehoshi/ebiten/inpututil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
count = 0
|
|
gophersImage *ebiten.Image
|
|
extraImages []*ebiten.Image
|
|
)
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
if inpututil.IsKeyJustPressed(ebiten.KeySpace) && js.Global != js.Null {
|
|
doc := js.Global.Get("document")
|
|
canvas := doc.Call("getElementsByTagName", "canvas").Index(0)
|
|
context := canvas.Call("getContext", "webgl")
|
|
if context == js.Null {
|
|
context = canvas.Call("getContext", "experimental-webgl")
|
|
}
|
|
// Edge might not support the extension. See
|
|
// https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_lose_context
|
|
if ext := context.Call("getExtension", "WEBGL_lose_context"); ext != js.Null {
|
|
ext.Call("loseContext")
|
|
fmt.Println("Context Lost!")
|
|
} else {
|
|
fmt.Println("Fail to force context lost. Edge might not support the extension yet.")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
count++
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
w, h := gophersImage.Size()
|
|
op := &ebiten.DrawImageOptions{}
|
|
|
|
// For the details, see examples/rotate.
|
|
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
|
|
op.GeoM.Rotate(float64(count%360) * 2 * math.Pi / 360)
|
|
op.GeoM.Translate(screenWidth/2, screenHeight/2)
|
|
screen.DrawImage(gophersImage, op)
|
|
|
|
ebitenutil.DebugPrint(screen, "Press Space to force GL context lost!\n(Browser only)")
|
|
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
// Decode image from a byte slice instead of a file so that
|
|
// this example works in any working directory.
|
|
// If you want to use a file, there are some options:
|
|
// 1) Use os.Open and pass the file to the image decoder.
|
|
// This is a very regular way, but doesn't work on browsers.
|
|
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
|
|
// This works even on browsers.
|
|
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
|
|
// This also works on browsers.
|
|
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
|
|
|
|
// Extend the shared backend GL texture on purpose.
|
|
for i := 0; i < 20; i++ {
|
|
eimg, _ := ebiten.NewImageFromImage(img, ebiten.FilterDefault)
|
|
extraImages = append(extraImages, eimg)
|
|
}
|
|
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Context Lost (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|