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Revert "internal/ui: refactoring: remove unnecessary hack for unfocusing"
This reverts commit 3f753b7086
.
Reason: this was actually necessary.
Updates #982
Updates #987
Closes #2521
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70bcec189d
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@ -1015,6 +1015,21 @@ func (u *userInterfaceImpl) loopGame() error {
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}
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func (u *userInterfaceImpl) updateGame() error {
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var unfocused bool
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// On Windows, the focusing state might be always false (#987).
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// On Windows, even if a window is in another workspace, vsync seems to work.
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// Then let's assume the window is always 'focused' as a workaround.
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if runtime.GOOS != "windows" {
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unfocused = u.window.GetAttrib(glfw.Focused) == glfw.False
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}
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var t1, t2 time.Time
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if unfocused {
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t1 = time.Now()
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}
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var outsideWidth, outsideHeight float64
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var deviceScaleFactor float64
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var err error
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@ -1046,6 +1061,20 @@ func (u *userInterfaceImpl) updateGame() error {
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u.swapBuffersOnRenderThread()
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})
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if unfocused {
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t2 = time.Now()
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}
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// When a window is not focused, SwapBuffers might return immediately and CPU might be busy.
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// Mitigate this by sleeping (#982).
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if unfocused {
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d := t2.Sub(t1)
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const wait = time.Second / 60
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if d < wait {
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time.Sleep(wait - d)
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}
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}
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return nil
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}
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