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This commit is contained in:
Hajime Hoshi 2018-01-07 20:32:18 +09:00
parent 1e33cbb66f
commit d8c0d88960
1 changed files with 9 additions and 8 deletions
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17
internal/clock/clock.go
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@ -99,13 +99,12 @@ func Update() int {
lastSystemTime = n lastSystemTime = n
} }
t := n - lastSystemTime diff := n - lastSystemTime
if t < 0 { if diff < 0 {
return 0 return 0
} }
count := 0 count := 0
syncWithSystemClock := false syncWithSystemClock := false
if audioTimeInFrames > 0 && lastAudioTimeInFrames != audioTimeInFrames { if audioTimeInFrames > 0 && lastAudioTimeInFrames != audioTimeInFrames {
@ -120,22 +119,24 @@ func Update() int {
syncWithSystemClock = true syncWithSystemClock = true
} else { } else {
// Use system clock when the audio clock is not updated yet. // Use system clock when the audio clock is not updated yet.
// As the audio clock can be updated discountinuously, the system clock is still needed. // As the audio clock can be updated discountinuously,
// the system clock is still needed.
if t > 5*int64(time.Second)/FPS { if diff > 5*int64(time.Second)/FPS {
// The previous time is too old. // The previous time is too old.
// Let's force to sync the game time with the system clock. // Let's force to sync the game time with the system clock.
syncWithSystemClock = true syncWithSystemClock = true
} else { } else {
count = int(t * FPS / int64(time.Second)) count = int(diff * FPS / int64(time.Second))
} }
} }
// Stabilize FPS. // Stabilize FPS.
if count == 0 && (int64(time.Second)/FPS/2) < t { // Without this adjustment, count can be unstable like 0, 2, 0, 2, ...
if count == 0 && (int64(time.Second)/FPS/2) < diff {
count = 1 count = 1
} }
if count == 2 && (int64(time.Second)/FPS*3/2) > t { if count == 2 && (int64(time.Second)/FPS*3/2) > diff {
count = 1 count = 1
} }