ebiten/ui/glfw/ui.go

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package glfw
import (
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"errors"
"fmt"
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glfw "github.com/go-gl/glfw3"
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"github.com/hajimehoshi/ebiten/graphics"
"github.com/hajimehoshi/ebiten/graphics/opengl"
"github.com/hajimehoshi/ebiten/input"
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"github.com/hajimehoshi/ebiten/ui"
)
func init() {
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glfw.SetErrorCallback(func(err glfw.ErrorCode, desc string) {
panic(fmt.Sprintf("%v: %v\n", err, desc))
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})
}
type UI struct {
canvas *canvas
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}
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func (u *UI) Start(width, height, scale int, title string) (ui.Canvas, error) {
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if !glfw.Init() {
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return nil, errors.New("glfw.Init() fails")
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}
glfw.WindowHint(glfw.Resizable, glfw.False)
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window, err := glfw.CreateWindow(width*scale, height*scale, title, nil, nil)
if err != nil {
return nil, err
}
c := &canvas{
window: window,
funcs: make(chan func()),
funcsDone: make(chan struct{}),
}
input.SetKeyboard(&c.keyboard)
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input.SetMouse(&c.mouse)
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graphics.SetTextureFactory(c)
c.run(width, height, scale)
// For retina displays, recalculate the scale with the framebuffer size.
windowWidth, _ := window.GetFramebufferSize()
realScale := windowWidth / width
c.use(func() {
c.context, err = opengl.Initialize(width, height, realScale)
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})
if err != nil {
return nil, err
}
u.canvas = c
return c, nil
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}
func (u *UI) DoEvents() {
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glfw.PollEvents()
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u.canvas.update()
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}
func (u *UI) Terminate() {
glfw.Terminate()
}