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loop: Refactoring: Remove FPS

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This commit is contained in:
Hajime Hoshi 2016-05-18 23:27:28 +09:00
parent dbd6ed8139
commit b1afe6aeb2
2 changed files with 8 additions and 10 deletions
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14
internal/loop/run.go
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@ -21,8 +21,6 @@ import (
"github.com/hajimehoshi/ebiten/internal/ui" "github.com/hajimehoshi/ebiten/internal/ui"
) )
const FPS = 60
func CurrentFPS() float64 { func CurrentFPS() float64 {
return currentRunContext.currentFPS() return currentRunContext.currentFPS()
} }
@ -99,7 +97,7 @@ type GraphicsContext interface {
Update() error Update() error
} }
func Run(g GraphicsContext, width, height, scale int, title string) error { func Run(g GraphicsContext, width, height, scale int, title string, fps int) error {
currentRunContext.startRunning() currentRunContext.startRunning()
defer currentRunContext.endRunning() defer currentRunContext.endRunning()
@ -127,17 +125,17 @@ func Run(g GraphicsContext, width, height, scale int, title string) error {
case ui.RenderEvent: case ui.RenderEvent:
n2 := now() n2 := now()
// If beforeForUpdate is too old, we assume that screen is not shown. // If beforeForUpdate is too old, we assume that screen is not shown.
if int64(5*time.Second/FPS) < n2-beforeForUpdate { if 5*int64(time.Second)/int64(fps) < n2-beforeForUpdate {
currentRunContext.setRunningSlowly(false) currentRunContext.setRunningSlowly(false)
beforeForUpdate = n2 beforeForUpdate = n2
} else { } else {
// Note that generally t is a little different from 1/60[sec]. // Note that generally t is a little different from 1/60[sec].
t := n2 - beforeForUpdate t := n2 - beforeForUpdate
currentRunContext.setRunningSlowly(t*FPS >= int64(time.Second*5/2)) currentRunContext.setRunningSlowly(t*int64(fps) >= int64(time.Second*5/2))
tt := int(t * FPS / int64(time.Second)) tt := int(t * int64(fps) / int64(time.Second))
// As t is not accurate 1/60[sec], errors are accumulated. // As t is not accurate 1/60[sec], errors are accumulated.
// To make the FPS stable, set tt 1 if t is a little less than 1/60[sec]. // 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(5*time.Millisecond)) < t { if tt == 0 && (int64(time.Second)/int64(fps)-int64(5*time.Millisecond)) < t {
tt = 1 tt = 1
} }
for i := 0; i < tt; i++ { for i := 0; i < tt; i++ {
@ -146,7 +144,7 @@ func Run(g GraphicsContext, width, height, scale int, title string) error {
} }
} }
ui.CurrentUI().SwapBuffers() ui.CurrentUI().SwapBuffers()
beforeForUpdate += int64(tt) * int64(time.Second) / FPS beforeForUpdate += int64(tt) * int64(time.Second) / int64(fps)
frames++ frames++
} }

4
run.go
View File

@ -20,7 +20,7 @@ import (
) )
// FPS represents how many times game updating happens in a second. // FPS represents how many times game updating happens in a second.
const FPS = loop.FPS const FPS = 60
// CurrentFPS returns the current number of frames per second of rendering. // CurrentFPS returns the current number of frames per second of rendering.
// //
@ -57,7 +57,7 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
ch := make(chan error) ch := make(chan error)
go func() { go func() {
g := newGraphicsContext(f) g := newGraphicsContext(f)
ch <- loop.Run(g, width, height, scale, title) ch <- loop.Run(g, width, height, scale, title, FPS)
}() }()
ui.Main() ui.Main()
return <-ch return <-ch