ebiten/internal/ui/ui_mobile.go

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// 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.
//go:build android || ios
package ui
import (
stdcontext "context"
"fmt"
"runtime"
"runtime/debug"
"sync"
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"sync/atomic"
"github.com/hajimehoshi/ebiten/v2/internal/gamepad"
"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/hook"
)
var (
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// renderCh receives when updating starts.
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renderCh = make(chan struct{})
// renderEndCh receives when updating finishes.
renderEndCh = make(chan struct{})
)
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func (u *UserInterface) init() error {
u.userInterfaceImpl = userInterfaceImpl{
graphicsLibraryInitCh: make(chan struct{}),
errCh: make(chan error),
// Give a default outside size so that the game can start without initializing them.
outsideWidth: 640,
outsideHeight: 480,
}
u.foreground.Store(true)
return nil
}
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// Update is called from mobile/ebitenmobileview.
//
// Update must be called on the rendering thread.
func (u *UserInterface) Update() error {
select {
case err := <-u.errCh:
return err
default:
}
if !u.IsFocused() {
return nil
}
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if err := gamepad.Update(); err != nil {
return err
}
ctx, cancel := stdcontext.WithCancel(stdcontext.Background())
defer cancel()
renderCh <- struct{}{}
go func() {
<-renderEndCh
cancel()
}()
graphicscommand.LoopRenderThread(ctx)
return nil
}
type userInterfaceImpl struct {
graphicsDriver graphicsdriver.Graphics
graphicsLibraryInitCh chan struct{}
outsideWidth float64
outsideHeight float64
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foreground atomic.Bool
errCh chan error
context *context
inputState InputState
touches []TouchForInput
fpsMode atomic.Int32
renderRequester RenderRequester
m sync.RWMutex
}
func (u *UserInterface) SetForeground(foreground bool) error {
u.foreground.Store(foreground)
if foreground {
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return hook.ResumeAudio()
} else {
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return hook.SuspendAudio()
}
}
func (u *UserInterface) Run(game Game, options *RunOptions) error {
return fmt.Errorf("internal/ui: Run is not implemented for GOOS=%s", runtime.GOOS)
}
func (u *UserInterface) RunWithoutMainLoop(game Game, options *RunOptions) {
go func() {
if err := u.runMobile(game, options); err != nil {
u.errCh <- err
}
}()
}
func (u *UserInterface) runMobile(game Game, options *RunOptions) (err error) {
// Convert the panic to a regular error so that Java/Objective-C layer can treat this easily e.g., for
// Crashlytics. A panic is treated as SIGABRT, and there is no way to handle this on Java/Objective-C layer
// unfortunately.
// TODO: Panic on other goroutines cannot be handled here.
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("%v\n%s", r, string(debug.Stack()))
}
}()
graphicscommand.SetOSThreadAsRenderThread()
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u.setRunning(true)
defer u.setRunning(false)
u.context = newContext(game)
g, lib, err := newGraphicsDriver(&graphicsDriverCreatorImpl{}, options.GraphicsLibrary)
if err != nil {
return err
}
u.graphicsDriver = g
u.setGraphicsLibrary(lib)
close(u.graphicsLibraryInitCh)
for {
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if err := u.update(); err != nil {
return err
}
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}
}
// outsideSize must be called on the same goroutine as update().
func (u *UserInterface) outsideSize() (float64, float64) {
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u.m.RLock()
defer u.m.RUnlock()
return u.outsideWidth, u.outsideHeight
}
func (u *UserInterface) update() error {
<-renderCh
defer func() {
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renderEndCh <- struct{}{}
}()
w, h := u.outsideSize()
if err := u.context.updateFrame(u.graphicsDriver, w, h, theMonitor.DeviceScaleFactor(), u); err != nil {
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return err
}
return nil
}
// SetOutsideSize is called from mobile/ebitenmobileview.
//
// SetOutsideSize is concurrent safe.
func (u *UserInterface) SetOutsideSize(outsideWidth, outsideHeight float64) {
u.m.Lock()
defer u.m.Unlock()
if u.outsideWidth != outsideWidth || u.outsideHeight != outsideHeight {
u.outsideWidth = outsideWidth
u.outsideHeight = outsideHeight
}
}
func (u *UserInterface) CursorMode() CursorMode {
return CursorModeHidden
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}
func (u *UserInterface) SetCursorMode(mode CursorMode) {
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// Do nothing
}
func (u *UserInterface) CursorShape() CursorShape {
return CursorShapeDefault
}
func (u *UserInterface) SetCursorShape(shape CursorShape) {
// Do nothing
}
func (u *UserInterface) IsFullscreen() bool {
return false
}
func (u *UserInterface) SetFullscreen(fullscreen bool) {
// Do nothing
}
func (u *UserInterface) IsFocused() bool {
return u.foreground.Load()
}
func (u *UserInterface) IsRunnableOnUnfocused() bool {
return false
}
func (u *UserInterface) SetRunnableOnUnfocused(runnableOnUnfocused bool) {
// Do nothing
}
func (u *UserInterface) FPSMode() FPSModeType {
return FPSModeType(u.fpsMode.Load())
}
func (u *UserInterface) SetFPSMode(mode FPSModeType) {
u.fpsMode.Store(int32(mode))
u.updateExplicitRenderingModeIfNeeded(mode)
}
func (u *UserInterface) updateExplicitRenderingModeIfNeeded(fpsMode FPSModeType) {
if u.renderRequester == nil {
return
}
u.renderRequester.SetExplicitRenderingMode(fpsMode == FPSModeVsyncOffMinimum)
}
func (u *UserInterface) readInputState(inputState *InputState) {
u.m.Lock()
defer u.m.Unlock()
u.inputState.copyAndReset(inputState)
}
func (u *UserInterface) Window() Window {
return &nullWindow{}
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}
type Monitor struct {
deviceScaleFactor float64
deviceScaleFactorOnce sync.Once
m sync.Mutex
}
var theMonitor = &Monitor{}
func (m *Monitor) Name() string {
return ""
}
func (m *Monitor) DeviceScaleFactor() float64 {
m.m.Lock()
defer m.m.Unlock()
// The device scale factor can be obtained after the main function starts, especially on Android.
// Initialize this lazily.
m.deviceScaleFactorOnce.Do(func() {
// Assume that the device scale factor never changes on mobiles.
m.deviceScaleFactor = deviceScaleFactorImpl()
})
return m.deviceScaleFactor
}
func (m *Monitor) Size() (int, int) {
// TODO: Return a valid value.
return 0, 0
}
func (u *UserInterface) AppendMonitors(mons []*Monitor) []*Monitor {
return append(mons, theMonitor)
}
func (u *UserInterface) Monitor() *Monitor {
return theMonitor
}
func (u *UserInterface) UpdateInput(keys map[Key]struct{}, runes []rune, touches []TouchForInput) {
u.updateInputStateFromOutside(keys, runes, touches)
if FPSModeType(u.fpsMode.Load()) == FPSModeVsyncOffMinimum {
u.renderRequester.RequestRenderIfNeeded()
}
}
type RenderRequester interface {
SetExplicitRenderingMode(explicitRendering bool)
RequestRenderIfNeeded()
}
func (u *UserInterface) SetRenderRequester(renderRequester RenderRequester) {
u.renderRequester = renderRequester
u.updateExplicitRenderingModeIfNeeded(FPSModeType(u.fpsMode.Load()))
}
func (u *UserInterface) ScheduleFrame() {
if u.renderRequester != nil && FPSModeType(u.fpsMode.Load()) == FPSModeVsyncOffMinimum {
u.renderRequester.RequestRenderIfNeeded()
}
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}
func (u *UserInterface) updateIconIfNeeded() error {
return nil
}
func IsScreenTransparentAvailable() bool {
return false
}