Change-Id: I8772c8d2690fbe6b636f1dcafe1393f6810d6716 Reviewed-on: https://go-review.googlesource.com/11822 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux,!android
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package app
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/*
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Simple on-screen app debugging for X11. Not an officially supported
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development target for apps, as screens with mice are very different
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than screens with touch panels.
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On Ubuntu 14.04 'Trusty', you may have to install these libraries:
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sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libx11-dev
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*/
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/*
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#cgo LDFLAGS: -lEGL -lGLESv2 -lX11
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void createWindow(void);
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void processEvents(void);
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void swapBuffers(void);
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*/
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import "C"
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import (
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"runtime"
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"time"
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"golang.org/x/mobile/event"
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"golang.org/x/mobile/geom"
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"golang.org/x/mobile/gl"
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)
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func main(f func(App)) {
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runtime.LockOSThread()
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C.createWindow()
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// TODO: send lifecycle events when e.g. the X11 window is iconified or moved off-screen.
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sendLifecycle(event.LifecycleStageFocused)
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donec := make(chan struct{})
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go func() {
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f(app{})
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close(donec)
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}()
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// TODO: can we get the actual vsync signal?
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ticker := time.NewTicker(time.Second / 60)
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defer ticker.Stop()
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tc := ticker.C
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for {
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select {
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case <-donec:
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return
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case <-gl.WorkAvailable:
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gl.DoWork()
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case <-endDraw:
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C.swapBuffers()
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tc = ticker.C
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case <-tc:
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tc = nil
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eventsIn <- event.Draw{}
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}
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C.processEvents()
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}
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}
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//export onResize
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func onResize(w, h int) {
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// TODO(nigeltao): don't assume 72 DPI. DisplayWidth and DisplayWidthMM
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// is probably the best place to start looking.
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pixelsPerPt = 1
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eventsIn <- event.Config{
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Width: geom.Pt(w),
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Height: geom.Pt(h),
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PixelsPerPt: pixelsPerPt,
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}
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// This gl.Viewport call has to be in a separate goroutine because any gl
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// call can block until gl.DoWork is called, but this goroutine is the one
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// responsible for calling gl.DoWork.
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// TODO: does this (GL-using) code belong here in the x/mobile/app
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// package?? See similar TODOs in the Android x/mobile/app implementation.
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c := make(chan struct{})
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go func() {
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gl.Viewport(0, 0, w, h)
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close(c)
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}()
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for {
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select {
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case <-gl.WorkAvailable:
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gl.DoWork()
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case <-c:
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return
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}
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}
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}
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func sendTouch(c event.Change, x, y float32) {
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eventsIn <- event.Touch{
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ID: 0, // TODO: button??
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Change: c,
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Loc: geom.Point{
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X: geom.Pt(x / pixelsPerPt),
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Y: geom.Pt(y / pixelsPerPt),
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},
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}
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}
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//export onTouchStart
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func onTouchStart(x, y float32) { sendTouch(event.ChangeOn, x, y) }
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//export onTouchMove
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func onTouchMove(x, y float32) { sendTouch(event.ChangeNone, x, y) }
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//export onTouchEnd
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func onTouchEnd(x, y float32) { sendTouch(event.ChangeOff, x, y) }
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var stopped bool
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//export onStop
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func onStop() {
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if stopped {
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return
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}
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stopped = true
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sendLifecycle(event.LifecycleStageDead)
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eventsIn <- stopPumping{}
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}
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