remove go2cpp support

Closes #2126

internal/devicescale/impl_js.go

@@ -19,10 +19,6 @@ import (
 )
 
 func impl(x, y int) float64 {
-	if go2cpp := js.Global().Get("go2cpp"); go2cpp.Truthy() {
-		return go2cpp.Get("devicePixelRatio").Float()
-	}
-
 	window := js.Global().Get("window")
 	if !window.Truthy() {
 		return 1

internal/gamepad/gamepad_js.go

@@ -22,7 +22,6 @@ import (
 
 var (
 	object = js.Global().Get("Object")
-	go2cpp = js.Global().Get("go2cpp")
 )
 
 type nativeGamepadsImpl struct {
@@ -38,7 +37,7 @@ func (g *nativeGamepadsImpl) init(gamepads *gamepads) error {
 }
 
 func (g *nativeGamepadsImpl) update(gamepads *gamepads) error {
-	// TODO: Use the gamepad events instead of navigator.getGamepads after go2cpp is removed.
+	// TODO: Use the gamepad events instead of navigator.getGamepads.
 
 	defer func() {
 		for k := range g.indices {
@@ -112,10 +111,6 @@ type nativeGamepadImpl struct {
 }
 
 func (g *nativeGamepadImpl) hasOwnStandardLayoutMapping() bool {
-	// With go2cpp, the controller must have the standard
-	if go2cpp.Truthy() {
-		return true
-	}
 	return g.mapping == "standard"
 }
 

internal/graphicsdriver/opengl/context_js.go

@@ -96,7 +96,7 @@ const (
 )
 
 var (
-	webGL2MightBeAvailable = !forceWebGL1 && (js.Global().Get("WebGL2RenderingContext").Truthy() || js.Global().Get("go2cpp").Truthy())
+	webGL2MightBeAvailable = !forceWebGL1 && (js.Global().Get("WebGL2RenderingContext").Truthy())
 )
 
 func uint8ArrayToSlice(value js.Value, length int) []byte {
@@ -152,9 +152,6 @@ func (c *context) initGL() error {
 		if !gl.Truthy() {
 			return fmt.Errorf("opengl: getContext failed")
 		}
-	} else if go2cpp := js.Global().Get("go2cpp"); go2cpp.Truthy() {
-		gl = go2cpp.Get("gl")
-		c.webGLVersion = webGLVersion2
 	}
 
 	c.gl = c.newGL(gl)

internal/ui/input_js.go

@@ -277,29 +277,6 @@ func (in *Input) updateTouchesFromEvent(e js.Value) {
 	}
 }
 
-func (i *Input) updateForGo2Cpp() {
-	if !go2cpp.Truthy() {
-		return
-	}
-
-	for k := range i.touches {
-		delete(i.touches, k)
-	}
-	touchCount := go2cpp.Get("touchCount").Int()
-	for idx := 0; idx < touchCount; idx++ {
-		id := go2cpp.Call("getTouchId", idx)
-		x := go2cpp.Call("getTouchX", idx)
-		y := go2cpp.Call("getTouchY", idx)
-		if i.touches == nil {
-			i.touches = map[TouchID]pos{}
-		}
-		i.touches[TouchID(id.Int())] = pos{
-			X: x.Int(),
-			Y: y.Int(),
-		}
-	}
-}
-
 func isKeyString(str string) bool {
 	// From https://www.w3.org/TR/uievents-key/#keys-unicode,
 	//

internal/ui/ui_js.go

@@ -100,7 +100,6 @@ var (
 	canvas                js.Value
 	requestAnimationFrame = js.Global().Get("requestAnimationFrame")
 	setTimeout            = js.Global().Get("setTimeout")
-	go2cpp                = js.Global().Get("go2cpp")
 )
 
 var (
@@ -109,9 +108,6 @@ var (
 )
 
 func init() {
-	if go2cpp.Truthy() {
-		return
-	}
 	documentHasFocus = document.Get("hasFocus").Call("bind", document)
 	documentHidden = js.Global().Get("Object").Call("getOwnPropertyDescriptor", js.Global().Get("Document").Get("prototype"), "hidden").Get("get").Call("bind", document)
 }
@@ -238,20 +234,15 @@ func (u *userInterfaceImpl) DeviceScaleFactor() float64 {
 }
 
 func (u *userInterfaceImpl) outsideSize() (float64, float64) {
-	switch {
-	case document.Truthy():
+	if document.Truthy() {
 		body := document.Get("body")
 		bw := body.Get("clientWidth").Float()
 		bh := body.Get("clientHeight").Float()
 		return bw, bh
-	case go2cpp.Truthy():
-		w := go2cpp.Get("screenWidth").Float()
-		h := go2cpp.Get("screenHeight").Float()
-		return w, h
-	default:
-		// Node.js
-		return 640, 480
 	}
+
+	// Node.js
+	return 640, 480
 }
 
 func (u *userInterfaceImpl) suspended() bool {
@@ -262,10 +253,6 @@ func (u *userInterfaceImpl) suspended() bool {
 }
 
 func (u *userInterfaceImpl) isFocused() bool {
-	if go2cpp.Truthy() {
-		return true
-	}
-
 	if !documentHasFocus.Invoke().Bool() {
 		return false
 	}
@@ -294,7 +281,6 @@ func (u *userInterfaceImpl) updateImpl(force bool) error {
 	if err := gamepad.Update(); err != nil {
 		return err
 	}
-	u.input.updateForGo2Cpp()
 
 	a := u.DeviceScaleFactor()
 	if u.lastDeviceScaleFactor != a {
@@ -618,15 +604,12 @@ func (u *userInterfaceImpl) Run(game Game) error {
 }
 
 func (u *userInterfaceImpl) updateScreenSize() {
-	switch {
-	case document.Truthy():
+	if document.Truthy() {
 		body := document.Get("body")
 		bw := int(body.Get("clientWidth").Float() * u.DeviceScaleFactor())
 		bh := int(body.Get("clientHeight").Float() * u.DeviceScaleFactor())
 		canvas.Set("width", bw)
 		canvas.Set("height", bh)
-	case go2cpp.Truthy():
-		// TODO: Implement this
 	}
 }