ebiten/internal/gamepad/gamepad_js.go

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// Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gamepad
import (
"encoding/hex"
"syscall/js"
"time"
)
var (
object = js.Global().Get("Object")
go2cpp = js.Global().Get("go2cpp")
)
type nativeGamepads struct {
indices map[int]struct{}
}
func (g *nativeGamepads) init(gamepads *gamepads) error {
return nil
}
func (g *nativeGamepads) update(gamepads *gamepads) error {
// TODO: Use the gamepad events instead of navigator.getGamepads after go2cpp is removed.
defer func() {
for k := range g.indices {
delete(g.indices, k)
}
}()
nav := js.Global().Get("navigator")
if !nav.Truthy() {
return nil
}
gps := nav.Call("getGamepads")
if !gps.Truthy() {
return nil
}
l := gps.Length()
for idx := 0; idx < l; idx++ {
gp := gps.Index(idx)
if !gp.Truthy() {
continue
}
index := gp.Get("index").Int()
if g.indices == nil {
g.indices = map[int]struct{}{}
}
g.indices[index] = struct{}{}
// The gamepad is not registered yet, register this.
gamepad := gamepads.find(func(gamepad *Gamepad) bool {
return index == gamepad.index
})
if gamepad == nil {
name := gp.Get("id").String()
// This emulates the implementation of EMSCRIPTEN_JoystickGetDeviceGUID.
// https://github.com/libsdl-org/SDL/blob/0e9560aea22818884921e5e5064953257bfe7fa7/src/joystick/emscripten/SDL_sysjoystick.c#L385
var sdlID [16]byte
copy(sdlID[:], []byte(name))
gamepad = gamepads.add(name, hex.EncodeToString(sdlID[:]))
gamepad.index = index
gamepad.mapping = gp.Get("mapping").String()
}
gamepad.value = gp
}
// Remove an unused gamepads.
gamepads.remove(func(gamepad *Gamepad) bool {
_, ok := g.indices[gamepad.index]
return !ok
})
return nil
}
type nativeGamepad struct {
value js.Value
index int
mapping string
}
func (g *nativeGamepad) hasOwnStandardLayoutMapping() bool {
// With go2cpp, the controller must have the standard
if go2cpp.Truthy() {
return true
}
return g.mapping == "standard"
}
func (g *nativeGamepad) update(gamepads *gamepads) error {
return nil
}
func (g *nativeGamepad) axisCount() int {
return g.value.Get("axes").Length()
}
func (g *nativeGamepad) buttonCount() int {
return g.value.Get("buttons").Length()
}
func (g *nativeGamepad) hatCount() int {
return 0
}
func (g *nativeGamepad) axisValue(axis int) float64 {
axes := g.value.Get("axes")
if axis < 0 || axis >= axes.Length() {
return 0
}
return axes.Index(axis).Float()
}
func (g *nativeGamepad) buttonValue(button int) float64 {
buttons := g.value.Get("buttons")
if button < 0 || button >= buttons.Length() {
return 0
}
return buttons.Index(button).Get("value").Float()
}
func (g *nativeGamepad) isButtonPressed(button int) bool {
buttons := g.value.Get("buttons")
if button < 0 || button >= buttons.Length() {
return false
}
return buttons.Index(button).Get("pressed").Bool()
}
func (g *nativeGamepad) hatState(hat int) int {
return hatCentered
}
func (g *nativeGamepad) vibrate(duration time.Duration, strongMagnitude float64, weakMagnitude float64) {
// vibrationActuator is avaialble on Chrome.
if va := g.value.Get("vibrationActuator"); va.Truthy() {
if !va.Get("playEffect").Truthy() {
return
}
prop := object.New()
prop.Set("startDelay", 0)
prop.Set("duration", float64(duration/time.Millisecond))
prop.Set("strongMagnitude", strongMagnitude)
prop.Set("weakMagnitude", weakMagnitude)
va.Call("playEffect", "dual-rumble", prop)
return
}
// hapticActuators is available on Firefox.
if ha := g.value.Get("hapticActuators"); ha.Truthy() {
// TODO: Is this order correct?
if ha.Length() > 0 {
ha.Index(0).Call("pulse", strongMagnitude, float64(duration/time.Millisecond))
}
if ha.Length() > 1 {
ha.Index(1).Call("pulse", weakMagnitude, float64(duration/time.Millisecond))
}
return
}
}