uidriver/glfw: Reduce (*thread).Call at (*Input).update

internal/driver/ui.go

@@ -22,7 +22,9 @@ import (
 type UIContext interface {
 	Update() error
 	Layout(outsideWidth, outsideHeight float64)
-	AdjustPosition(x, y float64) (float64, float64)
+
+	// AdjustPosition can be called from a different goroutine from Update's or Layout's.
+	AdjustPosition(x, y float64, deviceScaleFactor float64) (float64, float64)
 }
 
 // RegularTermination represents a regular termination.

internal/uidriver/glfw/input.go

@@ -308,9 +308,8 @@ func (i *Input) setWheel(xoff, yoff float64) {
 	i.scrollY = yoff
 }
 
+// update must be called from the main thread.
 func (i *Input) update(window *glfw.Window, context driver.UIContext) {
-	var cx, cy float64
-	_ = i.ui.t.Call(func() error {
 	i.onceCallback.Do(func() {
 		window.SetCharModsCallback(func(w *glfw.Window, char rune, mods glfw.ModifierKey) {
 			i.appendRuneBuffer(char)
@@ -331,16 +330,11 @@ func (i *Input) update(window *glfw.Window, context driver.UIContext) {
 	for gb := range glfwMouseButtonToMouseButton {
 		i.mouseButtonPressed[gb] = window.GetMouseButton(gb) == glfw.Press
 	}
-		cx, cy = window.GetCursorPos()
+	cx, cy := window.GetCursorPos()
 	// TODO: This is tricky. Rename the function?
 	cx = i.ui.fromGLFWMonitorPixel(cx)
 	cy = i.ui.fromGLFWMonitorPixel(cy)
-		return nil
+	cx, cy = context.AdjustPosition(cx, cy, i.ui.deviceScaleFactor())
-	})
-
-	cx, cy = context.AdjustPosition(cx, cy)
-
-	_ = i.ui.t.Call(func() error {
 	i.cursorX, i.cursorY = int(cx), int(cy)
 
 	for id := glfw.Joystick(0); id < glfw.Joystick(len(i.gamepads)); id++ {
@@ -383,6 +377,4 @@ func (i *Input) update(window *glfw.Window, context driver.UIContext) {
 		i.gamepads[id].guid = id.GetGUID()
 		i.gamepads[id].name = id.GetName()
 	}
-		return nil
-	})
 }

internal/uidriver/glfw/ui.go

@@ -834,12 +834,9 @@ func (u *UserInterface) update() error {
 
 	_ = u.t.Call(func() error {
 		glfw.PollEvents()
-		return nil
-	})
 		u.input.update(u.window, u.context)
-	_ = u.t.Call(func() error {
-		defer hooks.ResumeAudio()
 
+		defer hooks.ResumeAudio()
 		for !u.isRunnableOnUnfocused() && u.window.GetAttrib(glfw.Focused) == 0 && !u.window.ShouldClose() {
 			hooks.SuspendAudio()
 			// Wait for an arbitrary period to avoid busy loop.

internal/uidriver/js/input_js.go

@@ -52,7 +52,7 @@ type Input struct {
 }
 
 func (i *Input) CursorPosition() (x, y int) {
-	xf, yf := i.ui.context.AdjustPosition(float64(i.cursorX), float64(i.cursorY))
+	xf, yf := i.ui.context.AdjustPosition(float64(i.cursorX), float64(i.cursorY), i.ui.DeviceScaleFactor())
 	return int(xf), int(yf)
 }
 
@@ -131,9 +131,10 @@ func (i *Input) TouchIDs() []driver.TouchID {
 }
 
 func (i *Input) TouchPosition(id driver.TouchID) (x, y int) {
+	d := i.ui.DeviceScaleFactor()
 	for tid, pos := range i.touches {
 		if id == tid {
-			x, y := i.ui.context.AdjustPosition(float64(pos.X), float64(pos.Y))
+			x, y := i.ui.context.AdjustPosition(float64(pos.X), float64(pos.Y), d)
 			return int(x), int(y)
 		}
 	}

internal/uidriver/mobile/ui.go

@@ -402,7 +402,7 @@ func (u *UserInterface) setGBuildSize(widthPx, heightPx int) {
 }
 
 func (u *UserInterface) adjustPosition(x, y int) (int, int) {
-	xf, yf := u.context.AdjustPosition(float64(x), float64(y))
+	xf, yf := u.context.AdjustPosition(float64(x), float64(y), deviceScale())
 	return int(xf), int(yf)
 }
 

uicontext.go

@@ -112,27 +112,27 @@ func (c *uiContext) setWindowResizable(resizable bool) {
 	}
 }
 
-func (c *uiContext) screenScale() float64 {
+func (c *uiContext) screenScale(deviceScaleFactor float64) float64 {
 	if c.offscreen == nil {
 		return 0
 	}
 	sw, sh := c.offscreen.Size()
-	d := uiDriver().DeviceScaleFactor()
+	scaleX := c.outsideWidth / float64(sw) * deviceScaleFactor
-	scaleX := c.outsideWidth / float64(sw) * d
+	scaleY := c.outsideHeight / float64(sh) * deviceScaleFactor
-	scaleY := c.outsideHeight / float64(sh) * d
 	return math.Min(scaleX, scaleY)
 }
 
-func (c *uiContext) offsets() (float64, float64) {
+func (c *uiContext) offsets(deviceScaleFactor float64) (float64, float64) {
 	if c.offscreen == nil {
 		return 0, 0
 	}
 	sw, sh := c.offscreen.Size()
-	d := uiDriver().DeviceScaleFactor()
+	s := c.screenScale(deviceScaleFactor)
-	s := c.screenScale()
 	width := float64(sw) * s
 	height := float64(sh) * s
-	return (c.outsideWidth*d - width) / 2, (c.outsideHeight*d - height) / 2
+	x := (c.outsideWidth*deviceScaleFactor - width) / 2
+	y := (c.outsideHeight*deviceScaleFactor - height) / 2
+	return x, y
 }
 
 func (c *uiContext) Update() error {
@@ -185,7 +185,7 @@ func (c *uiContext) update() error {
 
 	op := &DrawImageOptions{}
 
-	s := c.screenScale()
+	s := c.screenScale(uiDriver().DeviceScaleFactor())
 	switch vd := uiDriver().Graphics().FramebufferYDirection(); vd {
 	case driver.Upward:
 		op.GeoM.Scale(s, -s)
@@ -197,7 +197,7 @@ func (c *uiContext) update() error {
 		panic(fmt.Sprintf("ebiten: invalid v-direction: %d", vd))
 	}
 
-	op.GeoM.Translate(c.offsets())
+	op.GeoM.Translate(c.offsets(uiDriver().DeviceScaleFactor()))
 	op.CompositeMode = CompositeModeCopy
 
 	// filterScreen works with >=1 scale, but does not well with <1 scale.
@@ -211,9 +211,8 @@ func (c *uiContext) update() error {
 	return nil
 }
 
-func (c *uiContext) AdjustPosition(x, y float64) (float64, float64) {
+func (c *uiContext) AdjustPosition(x, y float64, deviceScaleFactor float64) (float64, float64) {
-	d := uiDriver().DeviceScaleFactor()
+	ox, oy := c.offsets(deviceScaleFactor)
-	ox, oy := c.offsets()
+	s := c.screenScale(deviceScaleFactor)
-	s := c.screenScale()
+	return (x*deviceScaleFactor - ox) / s, (y*deviceScaleFactor - oy) / s
-	return (x*d - ox) / s, (y*d - oy) / s
 }