internal/ui: make a separate package to hide a console

Updates #2896

go.mod

@@ -3,6 +3,7 @@ module github.com/hajimehoshi/ebiten/v2
 go 1.18
 
 require (
+	github.com/ebitengine/hideconsole v0.1.0
 	github.com/ebitengine/oto/v3 v3.2.0-alpha.3
 	github.com/ebitengine/purego v0.6.0-alpha.4.0.20240127153756-e7ad88ddfffe
 	github.com/go-text/typesetting v0.1.1-0.20231231232151-8d81c02dc157

go.sum

@@ -1,3 +1,5 @@
+github.com/ebitengine/hideconsole v0.1.0 h1:pNW5M6xbD+icVaTg+vUl9ZsPTV3BopSTjEWEQitM1WI=
+github.com/ebitengine/hideconsole v0.1.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
 github.com/ebitengine/oto/v3 v3.2.0-alpha.3 h1:gDsHiEBKofH9scQ7rf+3jE1XOutgB0KvTkvP74LaRH4=
 github.com/ebitengine/oto/v3 v3.2.0-alpha.3/go.mod h1:JtMbxJHZBDXfS8BmVYwzWk9Z6r7jsjwsHzOuZrEkfs4=
 github.com/ebitengine/purego v0.6.0-alpha.4.0.20240127153756-e7ad88ddfffe h1:bac7sG+vDG+mBmjElwI0p1a2L09rxkY8xcmv5QEFyGA=

internal/ui/hideconsole_windows.go

@@ -1,73 +0,0 @@
-// Copyright 2017 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ui
-
-import (
-	"fmt"
-
-	"golang.org/x/sys/windows"
-)
-
-var (
-	kernel32 = windows.NewLazySystemDLL("kernel32.dll")
-
-	procFreeConsoleWindow = kernel32.NewProc("FreeConsole")
-	procGetConsoleWindow  = kernel32.NewProc("GetConsoleWindow")
-)
-
-func freeConsole() error {
-	r, _, e := procFreeConsoleWindow.Call()
-	if int32(r) == 0 {
-		if e != nil && e != windows.ERROR_SUCCESS {
-			return fmt.Errorf("ui: FreeConsole failed: %w", e)
-		}
-		return fmt.Errorf("ui: FreeConsole returned 0")
-	}
-	return nil
-}
-
-func getConsoleWindow() windows.HWND {
-	r, _, _ := procGetConsoleWindow.Call()
-	return windows.HWND(r)
-}
-
-// hideConsoleWindow will hide the console window that is showing when
-// compiling on Windows without specifying the '-ldflags "-Hwindowsgui"' flag.
-func hideConsoleWindow() {
-	// In Xbox, GetWindowThreadProcessId might not exist.
-	if user32.NewProc("GetWindowThreadProcessId").Find() != nil {
-		return
-	}
-
-	pid := windows.GetCurrentProcessId()
-
-	// Get the process ID of the console's creator.
-	var cpid uint32
-	if _, err := windows.GetWindowThreadProcessId(getConsoleWindow(), &cpid); err != nil {
-		// Even if closing the console fails, this is not harmful.
-		// Ignore error.
-		return
-	}
-
-	if pid == cpid {
-		// The current process created its own console. Hide this.
-		// Ignore error.
-		_ = freeConsole()
-	}
-}
-
-func init() {
-	hideConsoleWindow()
-}

internal/ui/ui.go

@@ -20,6 +20,8 @@ import (
 	"sync"
 	"sync/atomic"
 
+	_ "github.com/ebitengine/hideconsole"
+
 	"github.com/hajimehoshi/ebiten/v2/internal/atlas"
 	"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
 	"github.com/hajimehoshi/ebiten/v2/internal/thread"