54b4a066d7
OpenGL ES is not installed by default on linux distributions, which can lead to a cryptic error. Add a comment after the #include mentioning what packages contain OpenGL ES on Ubuntu, which is helpfully printed in the error message. For example: $ go build golang.org/x/mobile/example/basic # golang.org/x/mobile/gl In file included from ../../mobile/gl/work.go:21:0: work.h:6:117: fatal error: GLES2/gl2.h: No such file or directory #include <GLES2/gl2.h> // install on Ubuntu with: sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libx11-dev Change-Id: Ia7ba583cee4dfdeed408f582b29da90de9a4fab3 Reviewed-on: https://go-review.googlesource.com/18058 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
123 lines
2.5 KiB
Go
123 lines
2.5 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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*/
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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/lifecycle"
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"golang.org/x/mobile/event/paint"
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"golang.org/x/mobile/event/size"
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"golang.org/x/mobile/event/touch"
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"golang.org/x/mobile/geom"
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)
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func init() {
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theApp.registerGLViewportFilter()
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}
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func main(f func(App)) {
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runtime.LockOSThread()
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workAvailable := theApp.worker.WorkAvailable()
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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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theApp.sendLifecycle(lifecycle.StageFocused)
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// TODO: translate X11 expose events to shiny paint events, instead of
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// sending this synthetic paint event as a hack.
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theApp.eventsIn <- paint.Event{}
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donec := make(chan struct{})
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go func() {
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f(theApp)
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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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var tc <-chan time.Time
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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 <-workAvailable:
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theApp.worker.DoWork()
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case <-theApp.publish:
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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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theApp.publishResult <- PublishResult{}
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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 := float32(1)
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theApp.eventsIn <- size.Event{
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WidthPx: w,
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HeightPx: h,
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WidthPt: geom.Pt(w),
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HeightPt: geom.Pt(h),
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PixelsPerPt: pixelsPerPt,
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}
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}
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func sendTouch(t touch.Type, x, y float32) {
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theApp.eventsIn <- touch.Event{
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X: x,
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Y: y,
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Sequence: 0, // TODO: button??
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Type: t,
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}
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}
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//export onTouchBegin
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func onTouchBegin(x, y float32) { sendTouch(touch.TypeBegin, x, y) }
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//export onTouchMove
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func onTouchMove(x, y float32) { sendTouch(touch.TypeMove, x, y) }
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//export onTouchEnd
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func onTouchEnd(x, y float32) { sendTouch(touch.TypeEnd, 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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theApp.sendLifecycle(lifecycle.StageDead)
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theApp.eventsIn <- stopPumping{}
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}
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