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package win
import (
"image"
"image/draw"
"runtime"
"time"
"github.com/faiface/gui/layout"
"github.com/faiface/mainthread"
"github.com/go-gl/gl/v2.1/gl"
"github.com/go-gl/glfw/v3.2/glfw"
)
type Option func(*options)
type options struct {
title string
width, height int
resizable bool
}
func Title(title string) Option {
return func(o *options) {
o.title = title
}
}
func Size(width, height int) Option {
return func(o *options) {
o.width = width
o.height = height
}
}
func Resizable() Option {
return func(o *options) {
o.resizable = true
}
}
func New(opts ...Option) (*Win, error) {
o := options{
title: "",
width: 640,
height: 480,
resizable: false,
}
for _, opt := range opts {
opt(&o)
}
w := &Win{
event: make(chan layout.EventConsume),
draw: make(chan layout.ImageFlush),
newSize: make(chan image.Rectangle),
finish: make(chan struct{}),
}
var err error
mainthread.Call(func() {
w.w, err = makeGLFWWin(&o)
})
if err != nil {
return nil, err
}
bounds := image.Rect(0, 0, o.width, o.height)
w.img = image.NewRGBA(bounds)
go func() {
runtime.LockOSThread()
w.openGLThread()
}()
mainthread.CallNonBlock(w.eventThread)
return w, nil
}
func makeGLFWWin(o *options) (*glfw.Window, error) {
err := glfw.Init()
if err != nil {
return nil, err
}
glfw.WindowHint(glfw.DoubleBuffer, glfw.False)
if o.resizable {
glfw.WindowHint(glfw.Resizable, glfw.True)
} else {
glfw.WindowHint(glfw.Resizable, glfw.False)
}
w, err := glfw.CreateWindow(o.width, o.height, o.title, nil, nil)
if err != nil {
return nil, err
}
return w, nil
}
type Win struct {
event chan layout.EventConsume
draw chan layout.ImageFlush
newSize chan image.Rectangle
finish chan struct{}
w *glfw.Window
img *image.RGBA
}
func (w *Win) Cancel() {
go func() {
<-layout.SendEvent(w.event, "cancel")
<-layout.SendEvent(w.event, "return")
close(w.event)
close(w.finish)
}()
}
func (w *Win) Event() <-chan layout.EventConsume {
return w.event
}
func (w *Win) Draw() chan<- layout.ImageFlush {
return w.draw
}
func (w *Win) eventThread() {
var moX, moY int
w.w.SetMouseButtonCallback(func(_ *glfw.Window, button glfw.MouseButton, action glfw.Action, mod glfw.ModifierKey) {
switch action {
case glfw.Press:
<-layout.SendEvent(w.event, "mo/down/%d/%d", moX, moY)
case glfw.Release:
<-layout.SendEvent(w.event, "mo/up/%d/%d", moX, moY)
}
})
w.w.SetCursorPosCallback(func(_ *glfw.Window, x, y float64) {
moX, moY = int(x), int(y)
<-layout.SendEvent(w.event, "mo/move/%d/%d", moX, moY)
})
w.w.SetCharCallback(func(_ *glfw.Window, r rune) {
<-layout.SendEvent(w.event, "kb/type/%d", r)
})
w.w.SetSizeCallback(func(_ *glfw.Window, width, height int) {
r := image.Rect(0, 0, width, height)
w.newSize <- r
<-layout.SendEvent(w.event, "resize/%d/%d/%d/%d", r.Min.X, r.Min.Y, r.Max.X, r.Max.Y)
})
w.w.SetCloseCallback(func(_ *glfw.Window) {
<-layout.SendEvent(w.event, "wi/close")
})
r := w.img.Bounds()
<-layout.SendEvent(w.event, "resize/%d/%d/%d/%d", r.Min.X, r.Min.Y, r.Max.X, r.Max.Y)
for {
select {
case <-w.finish:
w.w.Destroy()
return
default:
glfw.WaitEventsTimeout(1.0 / 30)
}
}
}
func (w *Win) openGLThread() {
w.w.MakeContextCurrent()
gl.Init()
var (
openGLFlushR = image.Rectangle{}
openGLFlush = time.NewTicker(time.Second / 30)
)
defer openGLFlush.Stop()
for {
select {
case <-w.finish:
return
case r := <-w.newSize:
img := image.NewRGBA(r)
draw.Draw(img, w.img.Bounds(), w.img, w.img.Bounds().Min, draw.Src)
w.img = img
openGLFlushR = r
case imfl := <-w.draw:
imfl.Image <- w.img
r := <-imfl.Flush
openGLFlushR = openGLFlushR.Union(r)
case <-openGLFlush.C:
r := openGLFlushR
openGLFlushR = image.Rectangle{}
bounds := w.img.Bounds()
r = r.Intersect(bounds)
if r.Empty() {
continue
}
tmp := image.NewRGBA(r)
draw.Draw(tmp, r, w.img, r.Min, draw.Src)
gl.DrawBuffer(gl.FRONT)
gl.Viewport(
int32(bounds.Min.X),
int32(bounds.Min.Y),
int32(bounds.Dx()),
int32(bounds.Dy()),
)
gl.RasterPos2d(
-1+2*float64(r.Min.X)/float64(bounds.Dx()),
+1-2*float64(r.Min.Y)/float64(bounds.Dy()),
)
gl.PixelZoom(1, -1)
gl.DrawPixels(
int32(r.Dx()),
int32(r.Dy()),
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(tmp.Pix),
)
gl.Flush()
}
}
}
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