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ui: Make FPS more stable (#203)

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This commit is contained in:
Hajime Hoshi 2016-04-09 18:56:07 +09:00
parent 884719264e
commit e608837943
1 changed files with 9 additions and 1 deletions
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10
run.go
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@ -199,9 +199,16 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
currentRunContext.setRunningSlowly(false) currentRunContext.setRunningSlowly(false)
beforeForUpdate = now beforeForUpdate = now
} else { } else {
// Note that generally t is a little more than 1/60[sec].
t := now - beforeForUpdate t := now - beforeForUpdate
currentRunContext.setRunningSlowly(t*FPS >= int64(time.Second*5/2)) currentRunContext.setRunningSlowly(t*FPS >= int64(time.Second*5/2))
tt := int(t * FPS / int64(time.Second)) tt := int(t * FPS / int64(time.Second))
// As t is not accurate 1/60[sec], errors are accumulated
// (generally, errors are positive values).
// To make the FPS stable, set tt 1 if t is a little less than 1/60[sec].
if tt == 0 && (int64(time.Second)/FPS-int64(10*time.Millisecond)) < t {
tt = 1
}
for i := 0; i < tt; i++ { for i := 0; i < tt; i++ {
if err := ui.CurrentUI().DoEvents(); err != nil { if err := ui.CurrentUI().DoEvents(); err != nil {
return err return err
@ -214,7 +221,8 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
} }
} }
ui.CurrentUI().SwapBuffers() ui.CurrentUI().SwapBuffers()
beforeForUpdate += int64(tt) * int64(time.Second) / FPS d := int64(tt) * int64(time.Second) / FPS
beforeForUpdate += d
frames++ frames++
} }