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- // 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 main
- import (
- "fmt"
- "syscall/js"
- )
- func (g *Game) loseAndRestoreContext() {
- if g.lost {
- return
- }
- doc := js.Global().Get("document")
- canvas := doc.Call("getElementsByTagName", "canvas").Index(0)
- context := canvas.Call("getContext", "webgl2")
- ext := context.Call("getExtension", "WEBGL_lose_context")
- if !ext.Truthy() {
- fmt.Println("Fail to force context lost.")
- return
- }
- ext.Call("loseContext")
- fmt.Println("Lost the context!")
- g.lost = true
- }
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