From 2d23168aca461537dc9c05e69929bee2428866e0 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 25 Jun 2022 00:02:11 +0900
Subject: [PATCH] iinternal/gamepad: start implementation for Xbox

Updates #2084
---
 ...{api_windows.go => api_desktop_windows.go} |  0
 internal/gamepad/api_xbox_windows.go          | 50 +++++++++++++++++++
 internal/gamepad/gamepad_xbox_windows.go      |  9 +++-
 3 files changed, 58 insertions(+), 1 deletion(-)
 rename internal/gamepad/{api_windows.go => api_desktop_windows.go} (100%)
 create mode 100644 internal/gamepad/api_xbox_windows.go

diff --git a/internal/gamepad/api_windows.go b/internal/gamepad/api_desktop_windows.go
similarity index 100%
rename from internal/gamepad/api_windows.go
rename to internal/gamepad/api_desktop_windows.go
diff --git a/internal/gamepad/api_xbox_windows.go b/internal/gamepad/api_xbox_windows.go
new file mode 100644
index 000000000..477535971
--- /dev/null
+++ b/internal/gamepad/api_xbox_windows.go
@@ -0,0 +1,50 @@
+// Copyright 2022 The Ebitengine 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.
+
+//go:build !ebitencbackend
+// +build !ebitencbackend
+
+package gamepad
+
+import (
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var (
+	gameInput = windows.NewLazySystemDLL("GameInput.dll")
+
+	procGameInputCreate = gameInput.NewProc("GameInputCreate")
+)
+
+func _GameInputCreate() (*_IGameInput, error) {
+	var gameInput *_IGameInput
+	r, _, _ := procGameInputCreate.Call(uintptr(unsafe.Pointer(&gameInput)))
+	if uint32(r) != uint32(windows.S_OK) {
+		return nil, fmt.Errorf("gamepad: GameInputCreate failed: HRESULT(%d)", uint32(r))
+	}
+	return gameInput, nil
+}
+
+type _IGameInput struct {
+	vtbl *_IGameInput_Vtbl
+}
+
+type _IGameInput_Vtbl struct {
+	QueryInterface uintptr
+	AddRef         uintptr
+	Release        uintptr
+}
diff --git a/internal/gamepad/gamepad_xbox_windows.go b/internal/gamepad/gamepad_xbox_windows.go
index d6b3c09b2..0e1bf249b 100644
--- a/internal/gamepad/gamepad_xbox_windows.go
+++ b/internal/gamepad/gamepad_xbox_windows.go
@@ -17,9 +17,16 @@
 
 package gamepad
 
-type nativeGamepadsXbox struct{}
+type nativeGamepadsXbox struct {
+	gameInput *_IGameInput
+}
 
 func (n *nativeGamepadsXbox) init(gamepads *gamepads) error {
+	g, err := _GameInputCreate()
+	if err != nil {
+		return err
+	}
+	n.gameInput = g
 	return nil
 }