2015-01-01 17:20:20 +01:00
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// Copyright 2015 Hajime Hoshi
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2014-12-24 03:04:10 +01:00
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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2014-12-09 15:16:04 +01:00
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2015-01-02 07:20:05 +01:00
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// +build !js
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2015-01-27 14:02:23 +01:00
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package ui
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2014-12-05 18:26:02 +01:00
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import (
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2014-12-07 15:18:56 +01:00
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"fmt"
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2014-12-05 18:26:02 +01:00
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glfw "github.com/go-gl/glfw3"
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2014-12-14 10:57:29 +01:00
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"runtime"
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2015-01-07 17:32:37 +01:00
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"time"
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2014-12-05 18:26:02 +01:00
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)
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2015-01-26 17:10:17 +01:00
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var currentUI *userInterface
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2015-01-01 17:20:20 +01:00
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2015-01-27 14:02:23 +01:00
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func Init() {
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2014-12-17 12:03:26 +01:00
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runtime.LockOSThread()
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2014-12-05 18:26:02 +01:00
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2014-12-17 09:10:38 +01:00
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glfw.SetErrorCallback(func(err glfw.ErrorCode, desc string) {
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panic(fmt.Sprintf("%v: %v\n", err, desc))
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})
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2014-12-05 18:26:02 +01:00
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if !glfw.Init() {
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2014-12-17 12:03:26 +01:00
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panic("glfw.Init() fails")
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2014-12-05 18:26:02 +01:00
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}
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2014-12-17 12:03:26 +01:00
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glfw.WindowHint(glfw.Visible, glfw.False)
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2014-12-05 18:26:02 +01:00
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glfw.WindowHint(glfw.Resizable, glfw.False)
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2014-12-17 12:03:26 +01:00
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window, err := glfw.CreateWindow(16, 16, "", nil, nil)
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2014-12-07 20:22:50 +01:00
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if err != nil {
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2014-12-17 12:03:26 +01:00
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panic(err)
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2014-12-07 20:22:50 +01:00
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}
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2015-01-26 17:10:17 +01:00
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u := &userInterface{
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2014-12-17 09:10:38 +01:00
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window: window,
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funcs: make(chan func()),
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2014-12-07 20:22:50 +01:00
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}
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2015-01-01 17:20:20 +01:00
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go func() {
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runtime.LockOSThread()
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u.window.MakeContextCurrent()
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2014-12-25 10:42:39 +01:00
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glfw.SwapInterval(1)
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2015-01-01 17:20:20 +01:00
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for f := range u.funcs {
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f()
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}
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}()
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2015-01-10 17:23:43 +01:00
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2015-01-26 17:10:17 +01:00
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currentUI = u
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2014-12-17 12:03:26 +01:00
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}
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2014-12-10 15:52:37 +01:00
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2015-01-27 14:02:23 +01:00
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func ExecOnUIThread(f func()) {
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ch := make(chan struct{})
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currentUI.funcs <- func() {
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defer close(ch)
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f()
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}
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<-ch
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}
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func Start(width, height, scale int, title string) (actualScale int, err error) {
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return currentUI.start(width, height, scale, title)
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}
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func Terminate() {
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currentUI.terminate()
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}
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func DoEvents() error {
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return currentUI.doEvents()
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}
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func IsClosed() bool {
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return currentUI.isClosed()
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}
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func SwapBuffers() {
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currentUI.swapBuffers()
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}
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2015-01-26 17:10:17 +01:00
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type userInterface struct {
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2015-01-27 14:02:23 +01:00
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window *glfw.Window
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scale int
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funcs chan func()
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2014-12-17 12:03:26 +01:00
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}
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) start(width, height, scale int, title string) (actualScale int, err error) {
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2014-12-17 12:03:26 +01:00
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monitor, err := glfw.GetPrimaryMonitor()
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if err != nil {
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2015-01-01 19:28:43 +01:00
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return 0, err
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2014-12-17 12:03:26 +01:00
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}
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videoMode, err := monitor.GetVideoMode()
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if err != nil {
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2015-01-01 19:28:43 +01:00
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return 0, err
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2014-12-17 12:03:26 +01:00
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}
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x := (videoMode.Width - width*scale) / 2
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y := (videoMode.Height - height*scale) / 3
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2014-12-26 13:49:31 +01:00
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ch := make(chan struct{})
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2015-01-26 17:10:17 +01:00
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window := u.window
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2014-12-26 13:49:31 +01:00
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window.SetFramebufferSizeCallback(func(w *glfw.Window, width, height int) {
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2015-01-26 17:25:50 +01:00
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window.SetFramebufferSizeCallback(nil)
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2014-12-26 13:49:31 +01:00
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close(ch)
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})
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2014-12-17 12:03:26 +01:00
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window.SetSize(width*scale, height*scale)
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window.SetTitle(title)
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window.SetPosition(x, y)
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window.Show()
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2014-12-26 12:44:15 +01:00
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for {
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done := false
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glfw.PollEvents()
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select {
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case <-ch:
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done = true
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default:
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}
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if done {
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break
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}
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}
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2015-01-26 17:10:17 +01:00
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u.scale = scale
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2014-12-14 10:57:29 +01:00
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// For retina displays, recalculate the scale with the framebuffer size.
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windowWidth, _ := window.GetFramebufferSize()
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2015-01-01 19:28:43 +01:00
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actualScale = windowWidth / width
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2015-01-01 17:20:20 +01:00
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2015-01-01 19:28:43 +01:00
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return actualScale, nil
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2015-01-01 17:20:20 +01:00
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}
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) pollEvents() error {
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2014-12-06 14:56:57 +01:00
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glfw.PollEvents()
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2015-01-27 14:02:23 +01:00
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return updateInput(u.window, u.scale)
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2014-12-05 18:26:02 +01:00
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}
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) doEvents() error {
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2015-01-11 17:54:18 +01:00
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if err := u.pollEvents(); err != nil {
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return err
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}
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2015-01-26 17:10:17 +01:00
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for u.window.GetAttribute(glfw.Focused) == 0 {
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2015-01-07 17:32:37 +01:00
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time.Sleep(time.Second / 60)
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2015-01-11 17:54:18 +01:00
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if err := u.pollEvents(); err != nil {
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return err
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}
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2015-01-07 17:32:37 +01:00
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}
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2015-01-11 17:54:18 +01:00
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return nil
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2015-01-07 17:32:37 +01:00
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}
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) terminate() {
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2014-12-05 18:26:02 +01:00
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glfw.Terminate()
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}
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2014-12-10 02:42:47 +01:00
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) isClosed() bool {
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2014-12-14 10:57:29 +01:00
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return u.window.ShouldClose()
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2014-12-10 02:42:47 +01:00
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}
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2014-12-10 17:06:38 +01:00
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2015-01-26 17:10:17 +01:00
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func (u *userInterface) swapBuffers() {
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2015-01-01 17:20:20 +01:00
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u.window.SwapBuffers()
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2014-12-14 10:57:29 +01:00
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}
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