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package win
import (
"image"
"image/draw"
"runtime"
"github.com/faiface/gui/event"
"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{
events: make(chan struct {
event string
result chan<- bool
}),
flushes: make(chan struct {
r image.Rectangle
flushed chan<- struct{}
}),
}
var err error
mainthread.Call(func() {
w.w, err = makeGLFWWin(&o)
})
if err != nil {
return nil, err
}
var (
cancelOpenGLThread = make(chan chan struct{})
cancelEventDispatch = make(chan chan struct{})
cancelEventThread = make(chan chan struct{})
)
w.cancels = []chan<- chan struct{}{
cancelEventThread,
cancelEventDispatch,
cancelOpenGLThread,
}
go func() {
runtime.LockOSThread()
openGLThread(w, cancelOpenGLThread, w.flushes)
}()
w.resize(o.width, o.height)
go eventDispatch(w, cancelEventDispatch, w.events)
mainthread.CallNonBlock(func() {
eventThread(w, cancelEventThread)
})
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 {
dispatch event.Dispatch
w *glfw.Window
rgba *image.RGBA
events chan struct {
event string
result chan<- bool
}
flushes chan struct {
r image.Rectangle
flushed chan<- struct{}
}
cancels []chan<- chan struct{}
}
func (w *Win) Event(pattern string, handler func(evt string) bool) {
w.dispatch.Event(pattern, handler)
}
func (w *Win) Happen(evt string) bool {
result := make(chan bool)
w.events <- struct {
event string
result chan<- bool
}{evt, result}
return <-result
}
func (w *Win) Close() error {
go func() {
for _, cancel := range w.cancels {
confirm := make(chan struct{})
cancel <- confirm
<-confirm
}
}()
return nil
}
func (w *Win) Image() *image.RGBA {
return w.rgba
}
func (w *Win) Flush(r image.Rectangle) {
flushed := make(chan struct{})
w.flushes <- struct {
r image.Rectangle
flushed chan<- struct{}
}{r, flushed}
<-flushed
}
func (w *Win) resize(width, height int) {
bounds := image.Rect(0, 0, width, height)
rgba := image.NewRGBA(bounds)
if w.rgba != nil {
draw.Draw(rgba, w.rgba.Bounds(), w.rgba, w.rgba.Bounds().Min, draw.Src)
}
w.rgba = rgba
w.Flush(bounds)
}
func eventDispatch(w *Win, cancel <-chan chan struct{}, events chan struct {
event string
result chan<- bool
}) {
loop:
for {
select {
case evt := <-events:
evt.result <- w.dispatch.Happen(evt.event)
case confirm := <-cancel:
close(confirm)
break loop
}
}
}
func eventThread(w *Win, cancel <-chan chan struct{}) {
var moX, moY int
w.w.SetMouseButtonCallback(func(_ *glfw.Window, button glfw.MouseButton, action glfw.Action, mod glfw.ModifierKey) {
switch action {
case glfw.Press:
w.Happen(event.Sprint("mo", "down", moX, moY))
case glfw.Release:
w.Happen(event.Sprint("mo", "up", moX, moY))
}
})
w.w.SetCursorPosCallback(func(_ *glfw.Window, x, y float64) {
moX, moY = int(x), int(y)
w.Happen(event.Sprint("mo", "move", moX, moY))
})
w.w.SetCharCallback(func(_ *glfw.Window, r rune) {
w.Happen(event.Sprint("kb", "type", r))
})
w.w.SetSizeCallback(func(_ *glfw.Window, width, height int) {
w.resize(width, height)
w.Happen(event.Sprint("resize", 0, 0, width, height))
})
w.w.SetCloseCallback(func(_ *glfw.Window) {
w.Happen(event.Sprint("wi", "close"))
})
loop:
for {
select {
default:
glfw.WaitEvents()
case confirm := <-cancel:
close(confirm)
break loop
}
}
}
func openGLThread(w *Win, cancel <-chan chan struct{}, flushes <-chan struct {
r image.Rectangle
flushed chan<- struct{}
}) {
w.w.MakeContextCurrent()
gl.Init()
loop:
for {
select {
case flush := <-w.flushes:
r := flush.r
bounds := w.rgba.Bounds()
r = bounds.Intersect(r)
if r.Empty() {
return
}
tmp := image.NewRGBA(r)
draw.Draw(tmp, r, w.rgba, 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()
close(flush.flushed)
case confirm := <-cancel:
w.w.Destroy()
close(confirm)
break loop
}
}
}
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