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app: don't delay FrameEvent.Frame by v-sync latency

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We should return as soon as possible from FrameEvent.Frame to
allow the main goroutine to continue processing other tasks.
Whereas GPU.Frame may touch the frame ops, GPU.Present will not,
so this change moves Present to after returning from FrameEvent.Frame.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2022-04-12 18:19:16 +02:00
parent 25fae8de30
commit 38ff78df5d
1 changed files with 4 additions and 4 deletions
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app/window.go
+4 -4
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@@ -248,10 +248,7 @@ func (w *Window) render(frame *op.Ops, viewport image.Point) error {
if err != nil {
return err
}
if err := w.gpu.Frame(frame, target, viewport); err != nil {
return err
}
return w.ctx.Present()
return w.gpu.Frame(frame, target, viewport)
}
func (w *Window) processFrame(d driver, frameStart time.Time) {
@@ -808,6 +805,9 @@ func (w *Window) processEvent(d driver, e event.Event) {
// We're done with frame, let the client continue.
w.frameAck <- struct{}{}
}
if err == nil && w.gpu != nil {
err = w.ctx.Present()
}
if err != nil {
w.destroyGPU()
w.out <- system.DestroyEvent{Err: err}