df8025159b
x11/gl is not thread-safe, so all x11/gl related API should be called from one thread. There's already a dedicated thread for GL calls, so move all x11 API calls to GL thread using gl.Do(...) Fixes golang/go#11066 Change-Id: If84a8d56e978ce30d7fbbc310740fcc794ce61d7 Reviewed-on: https://go-review.googlesource.com/10744 Reviewed-by: Nigel Tao <nigeltao@golang.org>
161 lines
3.0 KiB
Go
161 lines
3.0 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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"sync"
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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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type windowEventType byte
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const (
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start windowEventType = iota
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stop
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resize
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)
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type windowEvent struct {
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eventType windowEventType
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arg1, arg2 int
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}
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var windowEvents struct {
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sync.Mutex
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events []windowEvent
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touches []event.Touch
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}
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func run(cbs []Callbacks) {
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runtime.LockOSThread()
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callbacks = cbs
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go gl.Start(func() {
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C.createWindow()
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sendEvent(windowEvent{start, 0, 0})
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})
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for range time.Tick(time.Second / 60) {
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windowEvents.Lock()
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events := windowEvents.events
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touches := windowEvents.touches
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windowEvents.events = nil
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windowEvents.touches = nil
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windowEvents.Unlock()
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for _, ev := range events {
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switch ev.eventType {
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case start:
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close(mainCalled)
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stateStart(callbacks)
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case stop:
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stateStop(callbacks)
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return
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case resize:
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w := ev.arg1
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h := ev.arg2
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// TODO(nigeltao): don't assume 72 DPI. DisplayWidth / DisplayWidthMM
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// is probably the best place to start looking.
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if geom.PixelsPerPt == 0 {
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geom.PixelsPerPt = 1
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}
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configAlt.Width = geom.Pt(w)
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configAlt.Height = geom.Pt(h)
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configSwap(callbacks)
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}
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}
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if !running {
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// Drop touch events before app started.
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continue
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}
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for _, cb := range callbacks {
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if cb.Touch != nil {
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for _, e := range touches {
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cb.Touch(e)
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}
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}
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}
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for _, cb := range callbacks {
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if cb.Draw != nil {
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cb.Draw()
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}
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}
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gl.Do(func() {
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C.swapBuffers()
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C.processEvents()
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})
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}
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}
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func sendEvent(ev windowEvent) {
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windowEvents.Lock()
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windowEvents.events = append(windowEvents.events, ev)
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windowEvents.Unlock()
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}
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//export onResize
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func onResize(w, h int) {
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gl.Viewport(0, 0, w, h)
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sendEvent(windowEvent{resize, w, h})
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}
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func sendTouch(ty event.TouchType, x, y float32) {
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windowEvents.Lock()
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windowEvents.touches = append(windowEvents.touches, event.Touch{
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ID: 0,
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Type: ty,
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Loc: geom.Point{
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X: geom.Pt(x / geom.PixelsPerPt),
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Y: geom.Pt(y / geom.PixelsPerPt),
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},
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})
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windowEvents.Unlock()
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}
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//export onTouchStart
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func onTouchStart(x, y float32) { sendTouch(event.TouchStart, x, y) }
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//export onTouchMove
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func onTouchMove(x, y float32) { sendTouch(event.TouchMove, x, y) }
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//export onTouchEnd
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func onTouchEnd(x, y float32) { sendTouch(event.TouchEnd, x, y) }
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//export onStop
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func onStop() {
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sendEvent(windowEvent{stop, 0, 0})
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}
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