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graphicsdriver/glfw: Bug fix: CPU was busy when the window is hidden

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Fixes #982
This commit is contained in:
Hajime Hoshi 2019-11-14 13:07:10 +09:00
parent 8c54cf639a
commit bfd5774faf
1 changed files with 20 additions and 0 deletions
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20
internal/uidriver/glfw/ui.go
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@ -823,6 +823,13 @@ func (u *UserInterface) loop(context driver.UIContext) error {
})
}()
for {
unfocused := u.window.GetAttrib(glfw.Focused) == glfw.False
var t1, t2 time.Time
if unfocused {
t1 = time.Now()
}
if err := u.update(context); err != nil {
return err
}
@ -831,6 +838,19 @@ func (u *UserInterface) loop(context driver.UIContext) error {
u.swapBuffers()
return nil
})
if unfocused {
t2 = time.Now()
}
// When a window is not focused, SwapBuffers might return immediately and CPU might be busy.
// Mitigate this by sleeping (#982).
if unfocused {
d := t2.Sub(t1)
const wait = time.Second / 60
if d < wait {
time.Sleep(wait - d)
}
}
}
}