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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin
// +build ios
package app
/*
#cgo CFLAGS: -x objective-c -DGL_SILENCE_DEPRECATION
#cgo LDFLAGS: -framework Foundation -framework UIKit -framework GLKit -framework OpenGLES -framework QuartzCore
#include <sys/utsname.h>
#include <stdint.h>
#include <pthread.h>
#include <UIKit/UIDevice.h>
#import <GLKit/GLKit.h>
extern struct utsname sysInfo;
void runApp(void);
void makeCurrentContext(GLintptr ctx);
void swapBuffers(GLintptr ctx);
uint64_t threadID();
*/
import "C"
import (
"log"
"runtime"
"strings"
"sync"
"golang.org/x/mobile/event/lifecycle"
"golang.org/x/mobile/event/paint"
"golang.org/x/mobile/event/size"
"golang.org/x/mobile/event/touch"
"golang.org/x/mobile/geom"
)
var initThreadID uint64
func init() {
// Lock the goroutine responsible for initialization to an OS thread.
// This means the goroutine running main (and calling the run function
// below) is locked to the OS thread that started the program. This is
// necessary for the correct delivery of UIKit events to the process.
//
// A discussion on this topic:
// https://groups.google.com/forum/#!msg/golang-nuts/IiWZ2hUuLDA/SNKYYZBelsYJ
runtime.LockOSThread()
initThreadID = uint64(C.threadID())
}
func main(f func(App)) {
if tid := uint64(C.threadID()); tid != initThreadID {
log.Fatalf("app.Run called on thread %d, but app.init ran on %d", tid, initThreadID)
}
go func() {
f(theApp)
// TODO(crawshaw): trigger runApp to return
}()
C.runApp()
panic("unexpected return from app.runApp")
}
var pixelsPerPt float32
var screenScale int // [UIScreen mainScreen].scale, either 1, 2, or 3.
//export setScreen
func setScreen(scale int) {
C.uname(&C.sysInfo)
name := C.GoString(&C.sysInfo.machine[0])
var v float32
switch {
case strings.HasPrefix(name, "iPhone"):
v = 163
case strings.HasPrefix(name, "iPad"):
// TODO: is there a better way to distinguish the iPad Mini?
switch name {
case "iPad2,5", "iPad2,6", "iPad2,7", "iPad4,4", "iPad4,5", "iPad4,6", "iPad4,7":
v = 163 // iPad Mini
default:
v = 132
}
default:
v = 163 // names like i386 and x86_64 are the simulator
}
if v == 0 {
log.Printf("unknown machine: %s", name)
v = 163 // emergency fallback
}
pixelsPerPt = v * float32(scale) / 72
screenScale = scale
}
//export updateConfig
func updateConfig(width, height, orientation int32) {
o := size.OrientationUnknown
switch orientation {
case C.UIDeviceOrientationPortrait, C.UIDeviceOrientationPortraitUpsideDown:
o = size.OrientationPortrait
case C.UIDeviceOrientationLandscapeLeft, C.UIDeviceOrientationLandscapeRight:
o = size.OrientationLandscape
}
widthPx := screenScale * int(width)
heightPx := screenScale * int(height)
theApp.eventsIn <- size.Event{
WidthPx: widthPx,
HeightPx: heightPx,
WidthPt: geom.Pt(float32(widthPx) / pixelsPerPt),
HeightPt: geom.Pt(float32(heightPx) / pixelsPerPt),
PixelsPerPt: pixelsPerPt,
Orientation: o,
}
theApp.eventsIn <- paint.Event{External: true}
}
// touchIDs is the current active touches. The position in the array
// is the ID, the value is the UITouch* pointer value.
//
// It is widely reported that the iPhone can handle up to 5 simultaneous
// touch events, while the iPad can handle 11.
var touchIDs [11]uintptr
var touchEvents struct {
sync.Mutex
pending []touch.Event
}
//export sendTouch
func sendTouch(cTouch, cTouchType uintptr, x, y float32) {
id := -1
for i, val := range touchIDs {
if val == cTouch {
id = i
break
}
}
if id == -1 {
for i, val := range touchIDs {
if val == 0 {
touchIDs[i] = cTouch
id = i
break
}
}
if id == -1 {
panic("out of touchIDs")
}
}
t := touch.Type(cTouchType)
if t == touch.TypeEnd {
touchIDs[id] = 0
}
theApp.eventsIn <- touch.Event{
X: x,
Y: y,
Sequence: touch.Sequence(id),
Type: t,
}
}
//export lifecycleDead
func lifecycleDead() { theApp.sendLifecycle(lifecycle.StageDead) }
//export lifecycleAlive
func lifecycleAlive() { theApp.sendLifecycle(lifecycle.StageAlive) }
//export lifecycleVisible
func lifecycleVisible() { theApp.sendLifecycle(lifecycle.StageVisible) }
//export lifecycleFocused
func lifecycleFocused() { theApp.sendLifecycle(lifecycle.StageFocused) }
//export startloop
func startloop(ctx C.GLintptr) {
go theApp.loop(ctx)
}
// loop is the primary drawing loop.
//
// After UIKit has captured the initial OS thread for processing UIKit
// events in runApp, it starts loop on another goroutine. It is locked
// to an OS thread for its OpenGL context.
func (a *app) loop(ctx C.GLintptr) {
runtime.LockOSThread()
C.makeCurrentContext(ctx)
workAvailable := a.worker.WorkAvailable()
for {
select {
case <-workAvailable:
a.worker.DoWork()
case <-theApp.publish:
loop1:
for {
select {
case <-workAvailable:
a.worker.DoWork()
default:
break loop1
}
}
C.swapBuffers(ctx)
theApp.publishResult <- PublishResult{}
}
}
}