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ui: Add runContext struct

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This commit is contained in:
Hajime Hoshi 2016-03-26 17:50:00 +09:00
parent 75ef9a6d47
commit 30d4437e97
1 changed files with 84 additions and 62 deletions
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146
run.go
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@ -20,49 +20,29 @@ import (
"github.com/hajimehoshi/ebiten/internal/ui"
)
var runContext = &struct {
type runContext struct {
running bool
fps float64
newScreenWidth int
newScreenHeight int
newScreenScale int
isRunningSlowly bool
}{}
// FPS represents how many times game updating happens in a second.
const FPS = 60
// CurrentFPS returns the current number of frames per second of rendering.
//
// This value represents how many times rendering happens in 1/60 second and
// NOT how many times logical game updating (a passed function to Run) happens.
// Note that logical game updating is assured to happen 60 times in a second
// as long as the screen is active.
func CurrentFPS() float64 {
return runContext.fps
}
// IsRunningSlowly returns true if the game is running too slowly to keep 60 FPS of rendering.
// The game screen is not updated when IsRunningSlowly is true.
// It is recommended to skip heavy processing, especially drawing, when IsRunningSlowly is true.
func IsRunningSlowly() bool {
return runContext.isRunningSlowly
var currentRunContext = &runContext{}
func (c *runContext) CurrentFPS() float64 {
return c.fps
}
// Run runs the game.
// f is a function which is called at every frame.
// The argument (*Image) is the render target that represents the screen.
//
// This function must be called from the main thread.
// Note that ebiten bounds the main goroutine to the main OS thread by runtime.LockOSThread.
//
// The given function f is guaranteed to be called 60 times a second
// even if a rendering frame is skipped.
// f is not called when the screen is not shown.
func Run(f func(*Image) error, width, height, scale int, title string) error {
runContext.running = true
func (c *runContext) IsRunningSlowly() bool {
return c.isRunningSlowly
}
func (c *runContext) Run(f func(*Image) error, width, height, scale int, title string) error {
c.running = true
defer func() {
runContext.running = false
c.running = false
}()
if err := ui.CurrentUI().Start(width, height, scale, title); err != nil {
@ -82,26 +62,26 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
beforeForFPS := now
for {
// TODO: setSize should be called after swapping buffers?
if 0 < runContext.newScreenWidth || 0 < runContext.newScreenHeight || 0 < runContext.newScreenScale {
if 0 < c.newScreenWidth || 0 < c.newScreenHeight || 0 < c.newScreenScale {
changed := false
if 0 < runContext.newScreenWidth || 0 < runContext.newScreenHeight {
c := ui.CurrentUI().SetScreenSize(runContext.newScreenWidth, runContext.newScreenHeight)
if 0 < c.newScreenWidth || 0 < c.newScreenHeight {
c := ui.CurrentUI().SetScreenSize(c.newScreenWidth, c.newScreenHeight)
changed = changed || c
}
if 0 < runContext.newScreenScale {
c := ui.CurrentUI().SetScreenScale(runContext.newScreenScale)
if 0 < c.newScreenScale {
c := ui.CurrentUI().SetScreenScale(c.newScreenScale)
changed = changed || c
}
if changed {
w, h := runContext.newScreenWidth, runContext.newScreenHeight
w, h := c.newScreenWidth, c.newScreenHeight
if err := graphicsContext.setSize(w, h, ui.CurrentUI().ActualScreenScale()); err != nil {
return err
}
}
}
runContext.newScreenWidth = 0
runContext.newScreenHeight = 0
runContext.newScreenScale = 0
c.newScreenWidth = 0
c.newScreenHeight = 0
c.newScreenScale = 0
if err := ui.CurrentUI().DoEvents(); err != nil {
return err
@ -111,13 +91,13 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
}
now := ui.Now()
// If beforeForUpdate is too old, we assume that screen is not shown.
runContext.isRunningSlowly = false
c.isRunningSlowly = false
if int64(5*time.Second/FPS) < now-beforeForUpdate {
beforeForUpdate = now
} else {
c := float64(now-beforeForUpdate) * FPS / float64(time.Second)
runContext.isRunningSlowly = c >= 2.5
for i := 0; i < int(c); i++ {
t := float64(now-beforeForUpdate) * FPS / float64(time.Second)
c.isRunningSlowly = t >= 2.5
for i := 0; i < int(t); i++ {
if err := ui.CurrentUI().DoEvents(); err != nil {
return err
}
@ -128,7 +108,7 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
return err
}
}
beforeForUpdate += int64(c) * int64(time.Second/FPS)
beforeForUpdate += int64(t) * int64(time.Second/FPS)
ui.CurrentUI().SwapBuffers()
}
@ -136,35 +116,77 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
now = ui.Now()
frames++
if time.Second <= time.Duration(now-beforeForFPS) {
runContext.fps = float64(frames) * float64(time.Second) / float64(now-beforeForFPS)
c.fps = float64(frames) * float64(time.Second) / float64(now-beforeForFPS)
beforeForFPS = now
frames = 0
}
}
}
func (c *runContext) SetScreenSize(width, height int) {
if !c.running {
panic("ebiten: SetScreenSize must be called during Run")
}
if width <= 0 || height <= 0 {
panic("ebiten: width and height must be positive")
}
c.newScreenWidth = width
c.newScreenHeight = height
}
func (c *runContext) SetScreenScale(scale int) {
if !c.running {
panic("ebiten: SetScreenScale must be called during Run")
}
if scale <= 0 {
panic("ebiten: scale must be positive")
}
c.newScreenScale = scale
}
// FPS represents how many times game updating happens in a second.
const FPS = 60
// CurrentFPS returns the current number of frames per second of rendering.
//
// This value represents how many times rendering happens in 1/60 second and
// NOT how many times logical game updating (a passed function to Run) happens.
// Note that logical game updating is assured to happen 60 times in a second
// as long as the screen is active.
func CurrentFPS() float64 {
return currentRunContext.CurrentFPS()
}
// IsRunningSlowly returns true if the game is running too slowly to keep 60 FPS of rendering.
// The game screen is not updated when IsRunningSlowly is true.
// It is recommended to skip heavy processing, especially drawing, when IsRunningSlowly is true.
func IsRunningSlowly() bool {
return currentRunContext.IsRunningSlowly()
}
// Run runs the game.
// f is a function which is called at every frame.
// The argument (*Image) is the render target that represents the screen.
//
// This function must be called from the main thread.
// Note that ebiten bounds the main goroutine to the main OS thread by runtime.LockOSThread.
//
// The given function f is guaranteed to be called 60 times a second
// even if a rendering frame is skipped.
// f is not called when the screen is not shown.
func Run(f func(*Image) error, width, height, scale int, title string) error {
return currentRunContext.Run(f, width, height, scale, title)
}
// SetScreenSize changes the (logical) size of the screen.
// This doesn't affect the current scale of the screen.
func SetScreenSize(width, height int) {
if !runContext.running {
panic("SetScreenSize must be called during Run")
}
if width <= 0 || height <= 0 {
panic("width and height must be positive")
}
runContext.newScreenWidth = width
runContext.newScreenHeight = height
currentRunContext.SetScreenSize(width, height)
}
// SetScreenSize changes the scale of the screen.
func SetScreenScale(scale int) {
if !runContext.running {
panic("SetScreenScale must be called during Run")
}
if scale <= 0 {
panic("scale must be positive")
}
runContext.newScreenScale = scale
currentRunContext.SetScreenScale(scale)
}
// ScreenScale returns the current screen scale.