mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
150 lines
2.9 KiB
Go
150 lines
2.9 KiB
Go
// Copyright 2015 Hajime Hoshi
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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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package ui
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import (
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"fmt"
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glfw "github.com/go-gl/glfw3"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"runtime"
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)
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var current *UI
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func Current() *UI {
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return current
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}
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func init() {
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runtime.LockOSThread()
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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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if !glfw.Init() {
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panic("glfw.Init() fails")
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}
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glfw.WindowHint(glfw.Visible, glfw.False)
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glfw.WindowHint(glfw.Resizable, glfw.False)
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window, err := glfw.CreateWindow(16, 16, "", nil, nil)
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if err != nil {
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panic(err)
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}
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u := &UI{
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window: window,
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funcs: make(chan func()),
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}
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go func() {
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runtime.LockOSThread()
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u.window.MakeContextCurrent()
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u.glContext = opengl.NewContext()
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glfw.SwapInterval(1)
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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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current = u
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}
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type UI struct {
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window *glfw.Window
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scale int
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actualScale int
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glContext *opengl.Context
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input Input
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funcs chan func()
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}
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func New(width, height, scale int, title string) (*UI, error) {
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monitor, err := glfw.GetPrimaryMonitor()
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if err != nil {
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return nil, err
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}
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videoMode, err := monitor.GetVideoMode()
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if err != nil {
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return nil, err
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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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ch := make(chan struct{})
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ui := current
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window := ui.window
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window.SetFramebufferSizeCallback(func(w *glfw.Window, width, height int) {
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close(ch)
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})
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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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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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ui.scale = scale
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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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ui.actualScale = windowWidth / width
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return ui, err
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}
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func (u *UI) ActualScale() int {
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return u.actualScale
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}
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func (u *UI) DoEvents() {
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glfw.PollEvents()
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u.input.update(u.window, u.scale)
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}
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func (u *UI) Terminate() {
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glfw.Terminate()
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}
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func (u *UI) IsClosed() bool {
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return u.window.ShouldClose()
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}
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func (u *UI) SwapBuffers() {
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u.window.SwapBuffers()
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}
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func (u *UI) Input() *Input {
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return &u.input
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}
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func (u *UI) Use(f func(*opengl.Context)) {
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ch := make(chan struct{})
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u.funcs <- func() {
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defer close(ch)
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f(u.glContext)
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}
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<-ch
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}
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