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internal/graphicsdriver/opengl: Give up restorign on browsers

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Using restorable images is expensive as this sometimes requires to
load pixels from GPU. On browsers, just reloading the application
should be fine when the context lost happens.

Closes #1603
This commit is contained in:
Hajime Hoshi 2021-06-26 16:50:12 +09:00
parent 38ce46328a
commit 8ff42f55a1
3 changed files with 3 additions and 29 deletions
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13
examples/contextlost/context_js.go
View File

@ -20,7 +20,6 @@ package main
import (
"fmt"
"syscall/js"
"time"
)
func (g *Game) loseAndRestoreContext() {
@ -48,17 +47,5 @@ func (g *Game) loseAndRestoreContext() {
ext.Call("loseContext")
fmt.Println("Lost the context!")
fmt.Println("The context is automatically restored after 3 seconds.")
g.lost = true
// If and only if the context is lost by loseContext, you need to call restoreContext. Note that in usual
// case of context lost, you cannot call restoreContext but the context should be restored automatically.
//
// After the context is lost, update will not be called. Instead, fire the goroutine to restore the context.
go func() {
time.Sleep(3 * time.Second)
ext.Call("restoreContext")
fmt.Println("Restored the context!")
g.lost = false
}()
}

5
internal/graphicsdriver/opengl/context_js.go
View File

@ -23,7 +23,6 @@ import (
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gles"
"github.com/hajimehoshi/ebiten/v2/internal/jsutil"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
"github.com/hajimehoshi/ebiten/v2/internal/web"
)
type (
@ -85,7 +84,6 @@ const (
var (
isWebGL2Available = !forceWebGL1 && (js.Global().Get("WebGL2RenderingContext").Truthy() || js.Global().Get("go2cpp").Truthy())
needsRestoring = !web.IsMobileBrowser() && !js.Global().Get("go2cpp").Truthy()
)
type contextImpl struct {
@ -526,7 +524,8 @@ func (c *context) flush() {
}
func (c *context) needsRestoring() bool {
return needsRestoring
// Though it is possible to have a logic to restore the graphics data for GPU, do not use it for performance (#1603).
return false
}
func (c *context) canUsePBO() bool {

14
internal/uidriver/js/ui_js.go
View File

@ -22,7 +22,6 @@ import (
"github.com/hajimehoshi/ebiten/v2/internal/driver"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl"
"github.com/hajimehoshi/ebiten/v2/internal/hooks"
"github.com/hajimehoshi/ebiten/v2/internal/restorable"
)
var (
@ -58,7 +57,6 @@ type UserInterface struct {
cursorShape driver.CursorShape
sizeChanged bool
contextLost bool
lastDeviceScaleFactor float64
@ -290,11 +288,6 @@ func (u *UserInterface) loop(context driver.UIContext) <-chan error {
var cf js.Func
f := func() {
if u.contextLost {
requestAnimationFrame.Invoke(cf)
return
}
if err := u.update(); err != nil {
close(reqStopAudioCh)
<-resStopAudioCh
@ -545,12 +538,7 @@ func setCanvasEventHandlers(v js.Value) {
v.Call("addEventListener", "webglcontextlost", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
e := args[0]
e.Call("preventDefault")
theUI.contextLost = true
restorable.OnContextLost()
return nil
}))
v.Call("addEventListener", "webglcontextrestored", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
theUI.contextLost = false
window.Get("location").Call("reload")
return nil
}))
}