internal/thread: refactoring: add a common interface Thread

internal/graphicscommand/thread.go

@@ -18,16 +18,12 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/thread"
 )
 
-var theRenderThread Thread = thread.NewNoopThread()
-
-type Thread interface {
-	Call(f func())
-}
+var theRenderThread thread.Thread = thread.NewNoopThread()
 
 // SetRenderThread must be called from the rendering thread where e.g. OpenGL works.
 //
 // TODO: Create thread in this package instead of setting it externally.
-func SetRenderThread(thread Thread) {
+func SetRenderThread(thread thread.Thread) {
 	theRenderThread = thread
 }
 

internal/thread/thread.go

@@ -19,6 +19,13 @@ import (
 	"runtime"
 )
 
+type Thread interface {
+	Loop(ctx context.Context) error
+	Call(f func())
+
+	private()
+}
+
 // OSThread represents an OS thread.
 type OSThread struct {
 	funcs chan func()
@@ -66,6 +73,9 @@ func (t *OSThread) Call(f func()) {
 	<-t.done
 }
 
+func (t *OSThread) private() {
+}
+
 // NoopThread is used to disable threading.
 type NoopThread struct{}
 
@@ -74,10 +84,15 @@ func NewNoopThread() *NoopThread {
 	return &NoopThread{}
 }
 
-// Loop does nothing
+// Loop does nothing.
 func (t *NoopThread) Loop(ctx context.Context) error {
 	return nil
 }
 
-// Call executes the func immediately
-func (t *NoopThread) Call(f func()) { f() }
+// Call executes the func immediately.
+func (t *NoopThread) Call(f func()) {
+	f()
+}
+
+func (t *NoopThread) private() {
+}

internal/ui/ui_glfw.go

@@ -17,7 +17,6 @@
 package ui
 
 import (
-	stdcontext "context"
 	"errors"
 	"fmt"
 	"image"
@@ -34,6 +33,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
 	"github.com/hajimehoshi/ebiten/v2/internal/hooks"
 	"github.com/hajimehoshi/ebiten/v2/internal/microsoftgdk"
+	"github.com/hajimehoshi/ebiten/v2/internal/thread"
 )
 
 func driverCursorModeToGLFWCursorMode(mode CursorMode) int {
@@ -115,16 +115,11 @@ type userInterfaceImpl struct {
 	darwinInitOnce        sync.Once
 	bufferOnceSwappedOnce sync.Once
 
-	mainThread   threadInterface
-	renderThread threadInterface
+	mainThread   thread.Thread
+	renderThread thread.Thread
 	m            sync.RWMutex
 }
 
-type threadInterface interface {
-	Loop(ctx stdcontext.Context) error
-	Call(f func())
-}
-
 const (
 	maxInt     = int(^uint(0) >> 1)
 	minInt     = -maxInt - 1