8fffdfa9fd
Higher-level widget or animation libraries should probably work in geom.Pt, but pixels instead of (1/72s of) inches seems a better fit for lower-level event libraries. Needlessly converting from (float32) pixels to (float32) points and back can be lossy and lead to off-by-one errors. Change-Id: I68102e36f2574b07b44c6a1b7281f4f27f9174cf Reviewed-on: https://go-review.googlesource.com/13002 Reviewed-by: David Crawshaw <crawshaw@golang.org>
120 lines
2.4 KiB
Go
120 lines
2.4 KiB
Go
// Copyright 2014 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 linux,!android
|
|
|
|
package app
|
|
|
|
/*
|
|
Simple on-screen app debugging for X11. Not an officially supported
|
|
development target for apps, as screens with mice are very different
|
|
than screens with touch panels.
|
|
|
|
On Ubuntu 14.04 'Trusty', you may have to install these libraries:
|
|
sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libx11-dev
|
|
*/
|
|
|
|
/*
|
|
#cgo LDFLAGS: -lEGL -lGLESv2 -lX11
|
|
|
|
void createWindow(void);
|
|
void processEvents(void);
|
|
void swapBuffers(void);
|
|
*/
|
|
import "C"
|
|
import (
|
|
"runtime"
|
|
"time"
|
|
|
|
"golang.org/x/mobile/event/config"
|
|
"golang.org/x/mobile/event/lifecycle"
|
|
"golang.org/x/mobile/event/paint"
|
|
"golang.org/x/mobile/event/touch"
|
|
"golang.org/x/mobile/geom"
|
|
"golang.org/x/mobile/gl"
|
|
)
|
|
|
|
func init() {
|
|
registerGLViewportFilter()
|
|
}
|
|
|
|
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()
|
|
}
|
|
}
|
|
|
|
//export onResize
|
|
func onResize(w, h int) {
|
|
// TODO(nigeltao): don't assume 72 DPI. DisplayWidth and DisplayWidthMM
|
|
// is probably the best place to start looking.
|
|
pixelsPerPt = 1
|
|
eventsIn <- config.Event{
|
|
WidthPx: w,
|
|
HeightPx: h,
|
|
WidthPt: geom.Pt(w),
|
|
HeightPt: geom.Pt(h),
|
|
PixelsPerPt: pixelsPerPt,
|
|
}
|
|
}
|
|
|
|
func sendTouch(t touch.Type, x, y float32) {
|
|
eventsIn <- touch.Event{
|
|
X: x,
|
|
Y: y,
|
|
Sequence: 0, // TODO: button??
|
|
Type: t,
|
|
}
|
|
}
|
|
|
|
//export onTouchBegin
|
|
func onTouchBegin(x, y float32) { sendTouch(touch.TypeBegin, x, y) }
|
|
|
|
//export onTouchMove
|
|
func onTouchMove(x, y float32) { sendTouch(touch.TypeMove, x, y) }
|
|
|
|
//export onTouchEnd
|
|
func onTouchEnd(x, y float32) { sendTouch(touch.TypeEnd, x, y) }
|
|
|
|
var stopped bool
|
|
|
|
//export onStop
|
|
func onStop() {
|
|
if stopped {
|
|
return
|
|
}
|
|
stopped = true
|
|
sendLifecycle(lifecycle.StageDead)
|
|
eventsIn <- stopPumping{}
|
|
}
|