ebiten/internal/ui/ui_mobile.go
2018-04-03 01:50:07 +09:00

303 lines
6.1 KiB
Go

// Copyright 2016 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 android ios
package ui
import (
"errors"
"image"
"runtime"
"sync"
"time"
"github.com/hajimehoshi/ebiten/internal/devicescale"
"github.com/hajimehoshi/ebiten/internal/input"
"github.com/hajimehoshi/ebiten/internal/opengl"
)
func Render(chError <-chan error) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
if chError == nil {
return errors.New("ui: chError must not be nil")
}
// TODO: Check this is called on the rendering thread
select {
case chRender <- struct{}{}:
return opengl.GetContext().DoWork(chError, chRenderEnd)
case <-time.After(500 * time.Millisecond):
// This function must not be blocked. We need to break for timeout.
return nil
}
}
type userInterface struct {
width int
height int
scale float64
sizeChanged bool
// Used for gomobile-build
fullscreenScale float64
fullscreenWidthPx int
fullscreenHeightPx int
m sync.RWMutex
}
var (
chRender = make(chan struct{})
chRenderEnd = make(chan struct{})
currentUI = &userInterface{}
)
func Run(width, height int, scale float64, title string, g GraphicsContext) error {
u := currentUI
u.m.Lock()
u.width = width
u.height = height
u.scale = scale
u.sizeChanged = true
u.m.Unlock()
// title is ignored?
initOpenGL()
for {
if err := u.update(g); err != nil {
return err
}
}
}
func (u *userInterface) updateGraphicsContext(g GraphicsContext) {
sizeChanged := false
width, height := 0, 0
actualScale := 0.0
u.m.Lock()
sizeChanged = u.sizeChanged
if sizeChanged {
width = u.width
height = u.height
actualScale = u.scaleImpl() * devicescale.DeviceScale()
}
u.sizeChanged = false
u.m.Unlock()
if sizeChanged {
// Sizing also calls GL functions
g.SetSize(width, height, actualScale)
}
}
func actualScale() float64 {
return currentUI.actualScale()
}
func (u *userInterface) actualScale() float64 {
u.m.Lock()
s := u.scaleImpl() * devicescale.DeviceScale()
u.m.Unlock()
return s
}
func (u *userInterface) scaleImpl() float64 {
scale := u.scale
if u.fullscreenScale != 0 {
scale = u.fullscreenScale
}
return scale
}
func (u *userInterface) update(g GraphicsContext) error {
<-chRender
defer func() {
chRenderEnd <- struct{}{}
}()
u.updateGraphicsContext(g)
if err := g.Update(func() {
u.updateGraphicsContext(g)
}); err != nil {
return err
}
return nil
}
func screenSize() (int, int) {
return currentUI.screenSize()
}
func (u *userInterface) screenSize() (int, int) {
u.m.Lock()
w, h := u.width, u.height
u.m.Unlock()
return w, h
}
func SetScreenSize(width, height int) bool {
currentUI.setScreenSize(width, height)
return true
}
func (u *userInterface) setScreenSize(width, height int) {
u.m.Lock()
if u.width != width || u.height != height {
u.width = width
u.height = height
u.updateFullscreenScaleIfNeeded()
u.sizeChanged = true
}
u.m.Unlock()
}
func SetScreenScale(scale float64) bool {
currentUI.setScreenScale(scale)
return false
}
func (u *userInterface) setScreenScale(scale float64) {
u.m.Lock()
if u.scale != scale {
u.scale = scale
u.sizeChanged = true
}
u.m.Unlock()
}
func ScreenScale() float64 {
u := currentUI
u.m.RLock()
s := u.scale
u.m.RUnlock()
return s
}
func setFullscreen(widthPx, heightPx int) {
currentUI.setFullscreen(widthPx, heightPx)
}
func (u *userInterface) setFullscreen(widthPx, heightPx int) {
u.m.Lock()
u.fullscreenWidthPx = widthPx
u.fullscreenHeightPx = heightPx
u.updateFullscreenScaleIfNeeded()
u.sizeChanged = true
u.m.Unlock()
}
func (u *userInterface) updateFullscreenScaleIfNeeded() {
if u.fullscreenWidthPx == 0 || u.fullscreenHeightPx == 0 {
return
}
w, h := u.width, u.height
scaleX := float64(u.fullscreenWidthPx) / float64(w)
scaleY := float64(u.fullscreenHeightPx) / float64(h)
scale := scaleX
if scale > scaleY {
scale = scaleY
}
u.fullscreenScale = scale / devicescale.DeviceScale()
}
func ScreenPadding() (x0, y0, x1, y1 float64) {
return currentUI.screenPadding()
}
func (u *userInterface) screenPadding() (x0, y0, x1, y1 float64) {
u.m.Lock()
x0, y0, x1, y1 = u.screenPaddingImpl()
u.m.Unlock()
return
}
func (u *userInterface) screenPaddingImpl() (x0, y0, x1, y1 float64) {
if u.fullscreenScale == 0 {
return 0, 0, 0, 0
}
s := u.fullscreenScale * devicescale.DeviceScale()
ox := (float64(u.fullscreenWidthPx) - float64(u.width)*s) / 2
oy := (float64(u.fullscreenHeightPx) - float64(u.height)*s) / 2
return ox, oy, ox, oy
}
func AdjustedCursorPosition() (x, y int) {
return currentUI.adjustPosition(input.Get().CursorPosition())
}
func AdjustedTouches() []*input.Touch {
ts := input.Get().Touches()
adjusted := make([]*input.Touch, len(ts))
for i, t := range ts {
x, y := currentUI.adjustPosition(t.Position())
adjusted[i] = input.NewTouch(t.ID(), x, y)
}
return adjusted
}
func (u *userInterface) adjustPosition(x, y int) (int, int) {
u.m.Lock()
ox, oy, _, _ := u.screenPaddingImpl()
s := u.scaleImpl()
as := s * devicescale.DeviceScale()
u.m.Unlock()
return int(float64(x)/s - ox/as), int(float64(y)/s - oy/as)
}
func IsCursorVisible() bool {
return false
}
func SetCursorVisible(visible bool) {
// Do nothing
}
func IsFullscreen() bool {
return false
}
func SetFullscreen(fullscreen bool) {
// Do nothing
}
func IsRunnableInBackground() bool {
return false
}
func SetRunnableInBackground(runnableInBackground bool) {
// Do nothing
}
func SetWindowIcon(iconImages []image.Image) {
// Do nothing
}
func IsWindowDecorated() bool {
return false
}
func SetWindowDecorated(decorated bool) {
// Do nothing
}
func UpdateTouches(touches []*input.Touch) {
input.Get().UpdateTouches(touches)
}