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ebiten: Do not skip Draw when vsync is disabled

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Closes #1520
This commit is contained in:
Hajime Hoshi 2021-03-01 12:06:07 +09:00
parent 9e73b0d287
commit 7dda2d8e4b
1 changed files with 7 additions and 4 deletions
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11
uicontext.go
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@ -190,13 +190,16 @@ func (c *uiContext) update(updateCount int) error {
uiDriver().ResetForFrame()
}
// Even though updateCount == 0, the offscreen is cleared and Draw is called.
// Even though updateCount == 0 and vsync is enabled, the offscreen is cleared and Draw is called.
// Draw should not update the game state and then the screen should not be updated without Update, but
// users might want to process something at Draw with the time intervals of FPS.
if IsScreenClearedEveryFrame() {
c.offscreen.Clear()
// When vsync is disabled, as performance matters, skip calling Draw when possible (#1520).
if updateCount > 0 || IsVsyncEnabled() {
if IsScreenClearedEveryFrame() {
c.offscreen.Clear()
}
c.game.Draw(c.offscreen)
}
c.game.Draw(c.offscreen)
// This clear is needed for fullscreen mode or some mobile platforms (#622).
c.screen.Clear()