mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
346 lines
8.6 KiB
Go
346 lines
8.6 KiB
Go
// Copyright 2015 Hajime Hoshi
|
|
//
|
|
// 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.
|
|
|
|
// +build js
|
|
|
|
package ui
|
|
|
|
import (
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/gopherjs/gopherjs/js"
|
|
"github.com/hajimehoshi/ebiten/internal/opengl"
|
|
)
|
|
|
|
var canvas *js.Object
|
|
|
|
type userInterface struct {
|
|
scale float64
|
|
deviceScale float64
|
|
sizeChanged bool
|
|
windowFocus bool
|
|
}
|
|
|
|
var currentUI = &userInterface{
|
|
sizeChanged: true,
|
|
windowFocus: true,
|
|
}
|
|
|
|
// NOTE: This returns true even when the browser is not active.
|
|
func shown() bool {
|
|
return !js.Global.Get("document").Get("hidden").Bool()
|
|
}
|
|
|
|
func SetScreenSize(width, height int) bool {
|
|
return currentUI.setScreenSize(width, height, currentUI.scale)
|
|
}
|
|
|
|
func SetScreenScale(scale float64) bool {
|
|
width, height := currentUI.size()
|
|
return currentUI.setScreenSize(width, height, scale)
|
|
}
|
|
|
|
func ScreenScale() float64 {
|
|
return currentUI.scale
|
|
}
|
|
|
|
func SetFullscreen(fullscreen bool) bool {
|
|
// TODO: Implement
|
|
return false
|
|
}
|
|
|
|
func IsFullscreen() bool {
|
|
// TODO: Implement
|
|
return false
|
|
}
|
|
|
|
func SetCursorVisibility(visibility bool) {
|
|
if visibility {
|
|
canvas.Get("style").Set("cursor", "auto")
|
|
} else {
|
|
canvas.Get("style").Set("cursor", "none")
|
|
}
|
|
}
|
|
|
|
func (u *userInterface) actualScreenScale() float64 {
|
|
return u.scale * u.deviceScale
|
|
}
|
|
|
|
func (u *userInterface) update(g GraphicsContext) error {
|
|
if !u.windowFocus {
|
|
return nil
|
|
}
|
|
if opengl.GetContext().IsContextLost() {
|
|
opengl.GetContext().RestoreContext()
|
|
g.Invalidate()
|
|
}
|
|
currentInput.updateGamepads()
|
|
if u.sizeChanged {
|
|
u.sizeChanged = false
|
|
w, h := u.size()
|
|
g.SetSize(w, h, u.actualScreenScale())
|
|
return nil
|
|
}
|
|
if err := g.Update(); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (u *userInterface) loop(g GraphicsContext) error {
|
|
ch := make(chan error)
|
|
var f func()
|
|
f = func() {
|
|
go func() {
|
|
if err := u.update(g); err != nil {
|
|
ch <- err
|
|
close(ch)
|
|
return
|
|
}
|
|
js.Global.Get("window").Call("requestAnimationFrame", f)
|
|
}()
|
|
}
|
|
f()
|
|
return <-ch
|
|
}
|
|
|
|
func touchEventToTouches(e *js.Object) []touch {
|
|
scale := currentUI.scale
|
|
j := e.Get("targetTouches")
|
|
rect := canvas.Call("getBoundingClientRect")
|
|
left, top := rect.Get("left").Int(), rect.Get("top").Int()
|
|
t := make([]touch, j.Get("length").Int())
|
|
for i := 0; i < len(t); i++ {
|
|
jj := j.Call("item", i)
|
|
t[i].id = jj.Get("identifier").Int()
|
|
t[i].x = int(float64(jj.Get("clientX").Int()-left) / scale)
|
|
t[i].y = int(float64(jj.Get("clientY").Int()-top) / scale)
|
|
}
|
|
return t
|
|
}
|
|
|
|
func init() {
|
|
if err := initialize(); err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
|
|
func initialize() error {
|
|
// Do nothing in node.js.
|
|
if js.Global.Get("require") != js.Undefined {
|
|
return nil
|
|
}
|
|
|
|
doc := js.Global.Get("document")
|
|
window := js.Global.Get("window")
|
|
if doc.Get("body") == nil {
|
|
ch := make(chan struct{})
|
|
window.Call("addEventListener", "load", func() {
|
|
close(ch)
|
|
})
|
|
<-ch
|
|
}
|
|
window.Call("addEventListener", "focus", func() {
|
|
currentUI.windowFocus = true
|
|
})
|
|
window.Call("addEventListener", "blur", func() {
|
|
currentUI.windowFocus = false
|
|
})
|
|
|
|
canvas = doc.Call("createElement", "canvas")
|
|
canvas.Set("width", 16)
|
|
canvas.Set("height", 16)
|
|
doc.Get("body").Call("appendChild", canvas)
|
|
|
|
htmlStyle := doc.Get("documentElement").Get("style")
|
|
htmlStyle.Set("height", "100%")
|
|
htmlStyle.Set("margin", "0")
|
|
htmlStyle.Set("padding", "0")
|
|
|
|
bodyStyle := doc.Get("body").Get("style")
|
|
bodyStyle.Set("backgroundColor", "#000")
|
|
bodyStyle.Set("position", "relative")
|
|
bodyStyle.Set("height", "100%")
|
|
bodyStyle.Set("margin", "0")
|
|
bodyStyle.Set("padding", "0")
|
|
// TODO: This is OK as long as the game is in an independent iframe.
|
|
// What if the canvas is embedded in a HTML directly?
|
|
doc.Get("body").Call("addEventListener", "click", func() {
|
|
canvas.Call("focus")
|
|
})
|
|
|
|
canvasStyle := canvas.Get("style")
|
|
canvasStyle.Set("position", "absolute")
|
|
|
|
// Make the canvas focusable.
|
|
canvas.Call("setAttribute", "tabindex", 1)
|
|
canvas.Get("style").Set("outline", "none")
|
|
|
|
// Keyboard
|
|
canvas.Call("addEventListener", "keydown", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
if e.Get("code") == js.Undefined {
|
|
// Assume that UA is Safari.
|
|
code := e.Get("keyCode").Int()
|
|
currentInput.keyDownSafari(code)
|
|
return
|
|
}
|
|
code := e.Get("code").String()
|
|
currentInput.keyDown(code)
|
|
})
|
|
canvas.Call("addEventListener", "keyup", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
if e.Get("code") == js.Undefined {
|
|
// Assume that UA is Safari.
|
|
code := e.Get("keyCode").Int()
|
|
currentInput.keyUpSafari(code)
|
|
}
|
|
code := e.Get("code").String()
|
|
currentInput.keyUp(code)
|
|
})
|
|
|
|
// Mouse
|
|
canvas.Call("addEventListener", "mousedown", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
button := e.Get("button").Int()
|
|
currentInput.mouseDown(button)
|
|
setMouseCursorFromEvent(e)
|
|
})
|
|
canvas.Call("addEventListener", "mouseup", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
button := e.Get("button").Int()
|
|
currentInput.mouseUp(button)
|
|
setMouseCursorFromEvent(e)
|
|
})
|
|
canvas.Call("addEventListener", "mousemove", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
setMouseCursorFromEvent(e)
|
|
})
|
|
canvas.Call("addEventListener", "contextmenu", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
})
|
|
|
|
// Touch
|
|
canvas.Call("addEventListener", "touchstart", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
currentInput.updateTouches(touchEventToTouches(e))
|
|
})
|
|
canvas.Call("addEventListener", "touchend", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
currentInput.updateTouches(touchEventToTouches(e))
|
|
})
|
|
canvas.Call("addEventListener", "touchmove", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
currentInput.updateTouches(touchEventToTouches(e))
|
|
})
|
|
|
|
// Gamepad
|
|
window.Call("addEventListener", "gamepadconnected", func(e *js.Object) {
|
|
// Do nothing.
|
|
})
|
|
|
|
canvas.Call("addEventListener", "webglcontextlost", func(e *js.Object) {
|
|
e.Call("preventDefault")
|
|
})
|
|
canvas.Call("addEventListener", "webglcontextrestored", func(e *js.Object) {
|
|
// Do nothing.
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
func setMouseCursorFromEvent(e *js.Object) {
|
|
scale := currentUI.scale
|
|
rect := canvas.Call("getBoundingClientRect")
|
|
x, y := e.Get("clientX").Int(), e.Get("clientY").Int()
|
|
x -= rect.Get("left").Int()
|
|
y -= rect.Get("top").Int()
|
|
currentInput.setMouseCursor(int(float64(x)/scale), int(float64(y)/scale))
|
|
}
|
|
|
|
func devicePixelRatio() float64 {
|
|
ratio := js.Global.Get("window").Get("devicePixelRatio").Float()
|
|
if ratio == 0 {
|
|
ratio = 1
|
|
}
|
|
return ratio
|
|
}
|
|
|
|
func RunMainThreadLoop(ch <-chan error) error {
|
|
return <-ch
|
|
}
|
|
|
|
func Run(width, height int, scale float64, title string, g GraphicsContext) error {
|
|
u := currentUI
|
|
doc := js.Global.Get("document")
|
|
doc.Set("title", title)
|
|
u.setScreenSize(width, height, scale)
|
|
canvas.Call("focus")
|
|
if err := opengl.Init(); err != nil {
|
|
return err
|
|
}
|
|
return u.loop(g)
|
|
}
|
|
|
|
func (u *userInterface) size() (width, height int) {
|
|
a := u.actualScreenScale()
|
|
if a == 0 {
|
|
// a == 0 only on the initial state.
|
|
return
|
|
}
|
|
width = int(canvas.Get("width").Float() / a)
|
|
height = int(canvas.Get("height").Float() / a)
|
|
return
|
|
}
|
|
|
|
func isSafari() bool {
|
|
ua := js.Global.Get("navigator").Get("userAgent").String()
|
|
if !strings.Contains(ua, "Safari") {
|
|
return false
|
|
}
|
|
if strings.Contains(ua, "Chrome") {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (u *userInterface) setScreenSize(width, height int, scale float64) bool {
|
|
w, h := u.size()
|
|
s := u.scale
|
|
if w == width && h == height && s == scale {
|
|
return false
|
|
}
|
|
u.scale = scale
|
|
// CSS imageRendering seems useful to enlarge the screen,
|
|
// but doesn't work in some cases (#306):
|
|
// * Chrome just after restoring the lost context
|
|
// * Safari
|
|
// Let's use the pixel ratio as it is here.
|
|
u.deviceScale = devicePixelRatio()
|
|
canvas.Set("width", int(float64(width)*u.actualScreenScale()))
|
|
canvas.Set("height", int(float64(height)*u.actualScreenScale()))
|
|
canvasStyle := canvas.Get("style")
|
|
|
|
cssWidth := int(float64(width) * scale)
|
|
cssHeight := int(float64(height) * scale)
|
|
canvasStyle.Set("width", strconv.Itoa(cssWidth)+"px")
|
|
canvasStyle.Set("height", strconv.Itoa(cssHeight)+"px")
|
|
// CSS calc requires space chars.
|
|
canvasStyle.Set("left", "calc((100% - "+strconv.Itoa(cssWidth)+"px) / 2)")
|
|
canvasStyle.Set("top", "calc((100% - "+strconv.Itoa(cssHeight)+"px) / 2)")
|
|
u.sizeChanged = true
|
|
return true
|
|
}
|