ebiten/mobile/ebitenmobileview/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.
// +build android ios
// Package ebitenmobileview offers functions for OpenGL/Metal view of mobiles.
//
// The functions are not intended for public usages.
// There is no guarantee of backward compatibility.
package ebitenmobileview
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// #cgo ios LDFLAGS: -framework UIKit -framework GLKit -framework QuartzCore -framework OpenGLES
//
// #include <stdint.h>
import "C"
import (
"runtime"
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"sync"
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"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/internal/uidriver/mobile"
)
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var theState state
type state struct {
started bool
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// m is a mutex required for each function.
// For example, on Android, Update can be called from a different thread:
// https://developer.android.com/reference/android/opengl/GLSurfaceView.Renderer
m sync.Mutex
}
func (s *state) isRunning() bool {
return s.started
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}
func SetGame(game ebiten.Game) {
theState.m.Lock()
defer theState.m.Unlock()
if theState.started {
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panic("ebitenmobileview: SetGame cannot be called twice or more")
}
ebiten.RunGameWithoutMainLoop(game)
theState.started = true
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}
func Layout(viewWidth, viewHeight float64) {
theState.m.Lock()
defer theState.m.Unlock()
mobile.Get().SetOutsideSize(viewWidth, viewHeight)
}
func Update() error {
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// Lock the OS thread since graphics functions (GL) must be called on this thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
theState.m.Lock()
defer theState.m.Unlock()
if !theState.started {
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// start is not called yet, but as update can be called from another thread, it is OK. Just ignore
// this.
return nil
}
return mobile.Get().Update()
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}
func Suspend() {
mobile.Get().SetForeground(false)
}
func Resume() {
mobile.Get().SetForeground(true)
}