graphics: Add worker consumer

internal/graphics/opengl/context.go

@@ -67,14 +67,24 @@ func NewContext() *Context {
 }
 
 var (
-	gl     mgl.Context
+	gl            mgl.Context
-	worker mgl.Worker
+	worker        mgl.Worker
+	workerCreated = make(chan struct{})
 )
 
-// TODO: Implement updating Worker
+func Loop() {
+	<-workerCreated
+	for {
+		select {
+		case <-worker.WorkAvailable():
+			worker.DoWork()
+		}
+	}
+}
 
 func (c *Context) init() {
 	gl, worker = mgl.NewContext()
+	close(workerCreated)
 	// Textures' pixel formats are alpha premultiplied.
 	gl.Enable(mgl.BLEND)
 	gl.BlendFunc(mgl.ONE, mgl.ONE_MINUS_SRC_ALPHA)

internal/ui/ui_glfw.go

@@ -22,6 +22,7 @@ import (
 	"time"
 
 	glfw "github.com/go-gl/glfw/v3.1/glfw"
+	"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
 )
 
 func Now() int64 {
@@ -51,18 +52,22 @@ func Init() {
 		funcs:  make(chan func()),
 	}
 	go func() {
-		runtime.LockOSThread()
-		u.window.MakeContextCurrent()
-		glfw.SwapInterval(1)
 		for f := range u.funcs {
 			f()
 		}
 	}()
+	go func() {
+		runtime.LockOSThread()
+		u.window.MakeContextCurrent()
+		glfw.SwapInterval(1)
+		opengl.Loop()
+	}()
 
 	currentUI = u
 }
 
 func ExecOnUIThread(f func()) {
+	// TODO: Rename this function: f is actually NOT executed on UI threads
 	ch := make(chan struct{})
 	currentUI.funcs <- func() {
 		defer close(ch)

run.go

@@ -57,7 +57,6 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
 	ui.ExecOnUIThread(func() {
 		glContext.Check()
 	})
-
 	graphicsContext, err := newGraphicsContext(width, height, actualScale)
 	if err != nil {
 		return err