func main(f func(App)) {
runtime.LockOSThread()
C.createWindow()
// TODO: send lifecycle events when e.g. the X11 window is iconified or moved off-screen.
sendLifecycle(lifecycle.StageFocused)
donec := make(chan struct{})
go func() {
f(app{})
close(donec)
}()
// TODO: can we get the actual vsync signal?
ticker := time.NewTicker(time.Second / 60)
defer ticker.Stop()
tc := ticker.C
for {
select {
case <-donec:
return
case <-gl.WorkAvailable:
gl.DoWork()
case <-endPaint:
C.swapBuffers()
tc = ticker.C
case <-tc:
tc = nil
eventsIn <- paint.Event{}
}
C.processEvents()
}
}
// 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{}
}
}
}
func main(f func(screen.Screen)) error {
if gl.Version() == "GL_ES_2_0" {
return errors.New("gldriver: ES 3 required on X11")
}
C.startDriver()
glctx, worker = gl.NewContext()
closec := make(chan struct{})
go func() {
f(theScreen)
close(closec)
}()
// heartbeat is a channel that, at regular intervals, directs the select
// below to also consider X11 events, not just Go events (channel
// communications).
//
// TODO: select instead of poll. Note that knowing whether to call
// C.processEvents needs to select on a file descriptor, and the other
// cases below select on Go channels.
heartbeat := time.NewTicker(time.Second / 60)
workAvailable := worker.WorkAvailable()
for {
select {
case <-closec:
return nil
case ctx := <-glcontextc:
// TODO: do we need to synchronize with seeing a size event for
// this window's context before or after calling makeCurrent?
// Otherwise, are we racing with the gl.Viewport call? I've
// occasionally seen a stale viewport, if the window manager sets
// the window width and height to something other than that
// requested by XCreateWindow, but it's not easily reproducible.
C.makeCurrent(C.uintptr_t(ctx))
case w := <-publishc:
C.swapBuffers(C.uintptr_t(w.ctx.(uintptr)))
w.publishDone <- screen.PublishResult{}
case req := <-uic:
ret := req.f()
if req.retc != nil {
req.retc <- ret
}
case <-heartbeat.C:
C.processEvents()
case <-workAvailable:
worker.DoWork()
}
}
}
func main(f func(App)) {
runtime.LockOSThread()
var worker gl.Worker
glctx, worker = gl.NewContext()
workAvailable := worker.WorkAvailable()
C.createWindow()
// TODO: send lifecycle events when e.g. the X11 window is iconified or moved off-screen.
theApp.sendLifecycle(lifecycle.StageFocused)
// TODO: translate X11 expose events to shiny paint events, instead of
// sending this synthetic paint event as a hack.
theApp.eventsIn <- paint.Event{}
donec := make(chan struct{})
go func() {
f(theApp)
close(donec)
}()
// TODO: can we get the actual vsync signal?
ticker := time.NewTicker(time.Second / 60)
defer ticker.Stop()
var tc <-chan time.Time
for {
select {
case <-donec:
return
case <-workAvailable:
worker.DoWork()
case <-theApp.publish:
C.swapBuffers()
tc = ticker.C
case <-tc:
tc = nil
theApp.publishResult <- PublishResult{}
}
C.processEvents()
}
}
