Add internal/gamepaddb (#1805)

This is basically a revert of 93a156a718.
This implements parsing the SDL gamepad mappings by Ebiten instead
of GLFW, so that Ebiten can handle parsing errors completely.

Closes #1802

input.go

@@ -16,6 +16,7 @@ package ebiten
 
 import (
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
+	"github.com/hajimehoshi/ebiten/v2/internal/gamepaddb"
 )
 
 // AppendInputChars appends "printable" runes, read from the keyboard at the time update is called, to runes,
@@ -251,11 +252,11 @@ func IsStandardGamepadLayoutAvailable(id GamepadID) bool {
 //
 // On platforms where gamepad mappings are not managed by Ebiten, this always returns false and nil.
 //
-// UpdateStandardGamepadLayoutMappings must be called on the main thread before ebiten.Run, and is concurrent-safe after ebiten.Run.
+// UpdateStandardGamepadLayoutMappings is concurrent-safe.
 //
 // Updated mappings take effect immediately even for already connected gamepads.
 func UpdateStandardGamepadLayoutMappings(mappings string) (bool, error) {
-	return uiDriver().Input().UpdateStandardGamepadLayoutMappings(mappings)
+	return gamepaddb.Update([]byte(mappings))
 }
 
 // TouchID represents a touch's identifier.

internal/driver/input.go

@@ -34,7 +34,6 @@ type Input interface {
 	IsStandardGamepadButtonPressed(id GamepadID, button StandardGamepadButton) bool
 	IsStandardGamepadLayoutAvailable(id GamepadID) bool
 	StandardGamepadAxisValue(id GamepadID, button StandardGamepadAxis) float64
-	UpdateStandardGamepadLayoutMappings(mapping string) (bool, error)
 	TouchPosition(id TouchID) (x, y int)
 	Wheel() (xoff, yoff float64)
 }

internal/gamepaddb/gamepaddb.go

@@ -0,0 +1,454 @@
+// Copyright 2021 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.
+
+// gamecontrollerdb.txt is downloaded at https://github.com/gabomdq/SDL_GameControllerDB.
+
+//go:generate curl --location --remote-name https://raw.githubusercontent.com/gabomdq/SDL_GameControllerDB/master/gamecontrollerdb.txt
+//go:generate file2byteslice -package gamepaddb -input=./gamecontrollerdb.txt -output=./gamecontrollerdb.txt.go -var=gamecontrollerdbTxt
+
+package gamepaddb
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/driver"
+)
+
+type platform int
+
+const (
+	platformUnknown platform = iota
+	platformWindows
+	platformMacOS
+	platformUnix
+	platformAndroid
+	platformIOS
+)
+
+var currentPlatform platform
+
+func init() {
+	if runtime.GOOS == "windows" {
+		currentPlatform = platformWindows
+		return
+	}
+
+	if runtime.GOOS == "aix" ||
+		runtime.GOOS == "dragonfly" ||
+		runtime.GOOS == "freebsd" ||
+		runtime.GOOS == "hurd" ||
+		runtime.GOOS == "illumos" ||
+		runtime.GOOS == "linux" ||
+		runtime.GOOS == "netbsd" ||
+		runtime.GOOS == "openbsd" ||
+		runtime.GOOS == "solaris" {
+		currentPlatform = platformUnix
+		return
+	}
+
+	if runtime.GOOS == "android" {
+		currentPlatform = platformAndroid
+		return
+	}
+
+	if isIOS {
+		currentPlatform = platformIOS
+		return
+	}
+
+	if runtime.GOOS == "darwin" {
+		currentPlatform = platformMacOS
+		return
+	}
+}
+
+var additionalGLFWGamepads = []byte(`
+78696e70757401000000000000000000,XInput Gamepad (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757402000000000000000000,XInput Wheel (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757403000000000000000000,XInput Arcade Stick (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757404000000000000000000,XInput Flight Stick (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757405000000000000000000,XInput Dance Pad (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757406000000000000000000,XInput Guitar (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+78696e70757408000000000000000000,XInput Drum Kit (GLFW),platform:Windows,a:b0,b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
+`)
+
+func init() {
+	if _, err := Update(gamecontrollerdbTxt); err != nil {
+		panic(err)
+	}
+	if _, err := Update(additionalGLFWGamepads); err != nil {
+		panic(err)
+	}
+}
+
+type mappingType int
+
+const (
+	mappingTypeButton mappingType = iota
+	mappingTypeAxis
+	mappingTypeHat
+)
+
+const (
+	HatUp    = 1
+	HatRight = 2
+	HatDown  = 4
+	HatLeft  = 8
+)
+
+type mapping struct {
+	Type       mappingType
+	Index      int
+	AxisScale  int
+	AxisOffset int
+	HatState   int
+}
+
+var (
+	gamepadButtonMappings = map[string]map[driver.StandardGamepadButton]*mapping{}
+	gamepadAxisMappings   = map[string]map[driver.StandardGamepadAxis]*mapping{}
+	mappingsM             sync.RWMutex
+)
+
+func processLine(line string, platform platform) error {
+	line = strings.TrimSpace(line)
+	if len(line) == 0 {
+		return nil
+	}
+	if line[0] == '#' {
+		return nil
+	}
+	tokens := strings.Split(line, ",")
+	id := tokens[0]
+	for _, token := range tokens[2:] {
+		if len(token) == 0 {
+			continue
+		}
+		tks := strings.Split(token, ":")
+		if tks[0] == "platform" {
+			switch tks[1] {
+			case "Windows":
+				if platform != platformWindows {
+					return nil
+				}
+			case "Mac OS X":
+				if platform != platformMacOS {
+					return nil
+				}
+			case "Linux":
+				if platform != platformUnix {
+					return nil
+				}
+			case "Android":
+				if platform != platformAndroid {
+					return nil
+				}
+			case "iOS":
+				if platform != platformIOS {
+					return nil
+				}
+			default:
+				return fmt.Errorf("gamepaddb: unexpected platform: %s", tks[1])
+			}
+			continue
+		}
+
+		// Found a token without a colon e.g., 'sat' or 'm_nin' on a Saturn controller. Ignore this.
+		if len(tks) == 1 {
+			continue
+		}
+
+		gb, err := parseMappingElement(tks[1])
+		if err != nil {
+			return err
+		}
+
+		if b, ok := toStandardGamepadButton(tks[0]); ok {
+			m, ok := gamepadButtonMappings[id]
+			if !ok {
+				m = map[driver.StandardGamepadButton]*mapping{}
+				gamepadButtonMappings[id] = m
+			}
+			m[b] = gb
+			continue
+		}
+
+		if a, ok := toStandardGamepadAxis(tks[0]); ok {
+			m, ok := gamepadAxisMappings[id]
+			if !ok {
+				m = map[driver.StandardGamepadAxis]*mapping{}
+				gamepadAxisMappings[id] = m
+			}
+			m[a] = gb
+			continue
+		}
+
+		// The buttons like "misc1" are ignored so far.
+		// There is no corresponding button in the Web standard gamepad layout.
+	}
+
+	return nil
+}
+
+func parseMappingElement(str string) (*mapping, error) {
+	switch {
+	case str[0] == 'a' || strings.HasPrefix(str, "+a") || strings.HasPrefix(str, "-a") || str[0] == '~':
+		var tilda bool
+		if str[0] == '~' {
+			str = str[1:]
+			tilda = true
+		}
+		if str[len(str)-1] == '~' {
+			str = str[:len(str)-1]
+			tilda = true
+		}
+
+		min := -1
+		max := 1
+		numstr := str[1:]
+
+		if str[0] == '+' {
+			numstr = str[2:]
+			min = 0
+		} else if str[0] == '-' {
+			numstr = str[2:]
+			max = 0
+		}
+
+		scale := 2 / (max - min)
+		offset := -(max + min)
+		if tilda {
+			scale = -scale
+			offset = -offset
+		}
+
+		index, err := strconv.Atoi(numstr)
+		if err != nil {
+			return nil, err
+		}
+
+		return &mapping{
+			Type:       mappingTypeAxis,
+			Index:      index,
+			AxisScale:  scale,
+			AxisOffset: offset,
+		}, nil
+
+	case str[0] == 'b':
+		index, err := strconv.Atoi(str[1:])
+		if err != nil {
+			return nil, err
+		}
+		return &mapping{
+			Type:  mappingTypeButton,
+			Index: index,
+		}, nil
+
+	case str[0] == 'h':
+		tokens := strings.Split(str[1:], ".")
+		if len(tokens) < 2 {
+			return nil, fmt.Errorf("gamepaddb: unexpected hat: %s", str)
+		}
+		index, err := strconv.Atoi(tokens[0])
+		if err != nil {
+			return nil, err
+		}
+		hat, err := strconv.Atoi(tokens[1])
+		if err != nil {
+			return nil, err
+		}
+		return &mapping{
+			Type:     mappingTypeHat,
+			Index:    index,
+			HatState: hat,
+		}, nil
+	}
+
+	return nil, fmt.Errorf("gamepaddb: unepxected mapping: %s", str)
+}
+
+func toStandardGamepadButton(str string) (driver.StandardGamepadButton, bool) {
+	switch str {
+	case "a":
+		return driver.StandardGamepadButtonRightBottom, true
+	case "b":
+		return driver.StandardGamepadButtonRightRight, true
+	case "x":
+		return driver.StandardGamepadButtonRightLeft, true
+	case "y":
+		return driver.StandardGamepadButtonRightTop, true
+	case "back":
+		return driver.StandardGamepadButtonCenterLeft, true
+	case "start":
+		return driver.StandardGamepadButtonCenterRight, true
+	case "guide":
+		return driver.StandardGamepadButtonCenterCenter, true
+	case "leftshoulder":
+		return driver.StandardGamepadButtonFrontTopLeft, true
+	case "rightshoulder":
+		return driver.StandardGamepadButtonFrontTopRight, true
+	case "leftstick":
+		return driver.StandardGamepadButtonLeftStick, true
+	case "rightstick":
+		return driver.StandardGamepadButtonRightStick, true
+	case "dpup":
+		return driver.StandardGamepadButtonLeftTop, true
+	case "dpright":
+		return driver.StandardGamepadButtonLeftRight, true
+	case "dpdown":
+		return driver.StandardGamepadButtonLeftBottom, true
+	case "dpleft":
+		return driver.StandardGamepadButtonLeftLeft, true
+	case "lefttrigger":
+		return driver.StandardGamepadButtonFrontBottomLeft, true
+	case "righttrigger":
+		return driver.StandardGamepadButtonFrontBottomRight, true
+	default:
+		return 0, false
+	}
+}
+
+func toStandardGamepadAxis(str string) (driver.StandardGamepadAxis, bool) {
+	switch str {
+	case "leftx":
+		return driver.StandardGamepadAxisLeftStickHorizontal, true
+	case "lefty":
+		return driver.StandardGamepadAxisLeftStickVertical, true
+	case "rightx":
+		return driver.StandardGamepadAxisRightStickHorizontal, true
+	case "righty":
+		return driver.StandardGamepadAxisRightStickVertical, true
+	default:
+		return 0, false
+	}
+}
+
+func HasStandardLayoutMapping(id string) bool {
+	mappingsM.RLock()
+	defer mappingsM.RUnlock()
+
+	if _, ok := gamepadButtonMappings[id]; ok {
+		return true
+	}
+	if _, ok := gamepadAxisMappings[id]; ok {
+		return true
+	}
+	return false
+}
+
+type GamepadState interface {
+	Axis(index int) float64
+	Button(index int) bool
+	Hat(index int) int
+}
+
+func AxisValue(id string, axis driver.StandardGamepadAxis, state GamepadState) float64 {
+	mappingsM.RLock()
+	defer mappingsM.RUnlock()
+
+	mappings, ok := gamepadAxisMappings[id]
+	if !ok {
+		return 0
+	}
+	switch m := mappings[axis]; m.Type {
+	case mappingTypeAxis:
+		v := state.Axis(m.Index)*float64(m.AxisScale) + float64(m.AxisOffset)
+		if v > 1 {
+			return 1
+		} else if v < -1 {
+			return -1
+		}
+		return v
+	case mappingTypeButton:
+		if state.Button(m.Index) {
+			return 1
+		} else {
+			return -1
+		}
+	case mappingTypeHat:
+		if state.Hat(m.Index)&m.HatState != 0 {
+			return 1
+		} else {
+			return -1
+		}
+	}
+
+	return 0
+}
+
+func IsButtonPressed(id string, button driver.StandardGamepadButton, state GamepadState) bool {
+	mappingsM.RLock()
+	defer mappingsM.RUnlock()
+
+	mappings, ok := gamepadButtonMappings[id]
+	if !ok {
+		return false
+	}
+	switch m := mappings[button]; m.Type {
+	case mappingTypeAxis:
+		v := state.Axis(m.Index)*float64(m.AxisScale) + float64(m.AxisOffset)
+		if m.AxisOffset < 0 || m.AxisOffset == 0 && m.AxisScale > 0 {
+			return v >= 0
+		} else {
+			return v <= 0
+		}
+	case mappingTypeButton:
+		return state.Button(m.Index)
+	case mappingTypeHat:
+		return state.Hat(m.Index)&m.HatState != 0
+	}
+
+	return false
+}
+
+// Update adds new gamepad mappings.
+// The string must be in the format of SDL_GameControllerDB.
+func Update(mapping []byte) (bool, error) {
+	if currentPlatform == platformUnknown {
+		return false, nil
+	}
+
+	// TODO: Implement this (#1557)
+	if currentPlatform == platformAndroid || currentPlatform == platformIOS {
+		// Note: NOT returning an error, as mappings also do not matter right now.
+		return false, nil
+	}
+
+	mappingsM.Lock()
+	defer mappingsM.Unlock()
+
+	buf := bytes.NewBuffer(mapping)
+	r := bufio.NewReader(buf)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil && err != io.EOF {
+			return false, err
+		}
+		if err := processLine(line, currentPlatform); err != nil {
+			return false, err
+		}
+		if err == io.EOF {
+			break
+		}
+	}
+
+	return true, nil
+}

internal/gamepaddb/gamepaddb_ios.go

@@ -0,0 +1,20 @@
+// Copyright 2021 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.
+
+//go:build darwin && ios
+// +build darwin,ios
+
+package gamepaddb
+
+const isIOS = true

internal/gamepaddb/gamepaddb_notios.go

@@ -0,0 +1,20 @@
+// Copyright 2021 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.
+
+//go:build !darwin || !ios
+// +build !darwin !ios
+
+package gamepaddb
+
+const isIOS = false

internal/glfw/const.go

@@ -24,8 +24,6 @@ import (
 type (
 	Action           int
 	ErrorCode        int
-	GamepadAxis      int
-	GamepadButton    int
 	Hint             int
 	InputMode        int
 	Joystick         int
@@ -169,30 +167,3 @@ const (
 	HatLeftUp    = HatLeft | HatUp
 	HatLeftDown  = HatLeft | HatDown
 )
-
-const (
-	AxisLeftX        = GamepadAxis(0)
-	AxisLeftY        = GamepadAxis(1)
-	AxisRightX       = GamepadAxis(2)
-	AxisRightY       = GamepadAxis(3)
-	AxisLeftTrigger  = GamepadAxis(4)
-	AxisRightTrigger = GamepadAxis(5)
-)
-
-const (
-	ButtonA           = GamepadButton(0)
-	ButtonB           = GamepadButton(1)
-	ButtonX           = GamepadButton(2)
-	ButtonY           = GamepadButton(3)
-	ButtonLeftBumper  = GamepadButton(4)
-	ButtonRightBumper = GamepadButton(5)
-	ButtonBack        = GamepadButton(6)
-	ButtonStart       = GamepadButton(7)
-	ButtonGuide       = GamepadButton(8)
-	ButtonLeftThumb   = GamepadButton(9)
-	ButtonRightThumb  = GamepadButton(10)
-	ButtonDpadUp      = GamepadButton(11)
-	ButtonDpadRight   = GamepadButton(12)
-	ButtonDpadDown    = GamepadButton(13)
-	ButtonDpadLeft    = GamepadButton(14)
-)

internal/glfw/glfw_notwindows.go

@@ -289,19 +289,6 @@ func (j Joystick) GetHats() []JoystickHatState {
 	return hats
 }
 
-func (j Joystick) GetGamepadState() *GamepadState {
-	s := glfw.Joystick(j).GetGamepadState()
-	if s == nil {
-		return nil
-	}
-	state := &GamepadState{}
-	for i, b := range s.Buttons {
-		state.Buttons[i] = Action(b)
-	}
-	copy(state.Axes[:], s.Axes[:])
-	return state
-}
-
 func GetMonitors() []*Monitor {
 	ms := []*Monitor{}
 	for _, m := range glfw.GetMonitors() {
@@ -360,10 +347,6 @@ func Terminate() {
 	glfw.Terminate()
 }
 
-func UpdateGamepadMappings(mapping string) bool {
-	return glfw.UpdateGamepadMappings(mapping)
-}
-
 func WaitEvents() {
 	glfw.WaitEvents()
 }

internal/glfw/glfw_windows.go

@@ -435,25 +435,6 @@ func (j Joystick) GetHats() []JoystickHatState {
 	return hats
 }
 
-func (j Joystick) GetGamepadState() *GamepadState {
-	var s struct {
-		Buttons [15]uint8
-		Axes    [6]float32
-	}
-	r := glfwDLL.call("glfwGetGamepadState", uintptr(j), uintptr(unsafe.Pointer(&s)))
-	panicError()
-	if r != True {
-		return nil
-	}
-
-	state := &GamepadState{}
-	for i, b := range s.Buttons {
-		state.Buttons[i] = Action(b)
-	}
-	copy(state.Axes[:], s.Axes[:])
-	return state
-}
-
 func GetMonitors() []*Monitor {
 	var l int32
 	ptr := glfwDLL.call("glfwGetMonitors", uintptr(unsafe.Pointer(&l)))
@@ -551,14 +532,6 @@ func Terminate() {
 	}
 }
 
-func UpdateGamepadMappings(mapping string) bool {
-	m := append([]byte(mapping), 0)
-	defer runtime.KeepAlive(m)
-	r := glfwDLL.call("glfwUpdateGamepadMappings", uintptr(unsafe.Pointer(&m[0])))
-	panicError()
-	return byte(r) == True
-}
-
 func WaitEvents() {
 	glfwDLL.call("glfwWaitEvents")
 	panicError()

internal/glfw/type.go

@@ -33,8 +33,3 @@ type VidMode struct {
 	BlueBits    int
 	RefreshRate int
 }
-
-type GamepadState struct {
-	Buttons [15]Action
-	Axes    [6]float32
-}

internal/uidriver/glfw/input.go

@@ -23,12 +23,12 @@
 package glfw
 
 import (
-	"fmt"
 	"math"
 	"sync"
 	"unicode"
 
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
+	"github.com/hajimehoshi/ebiten/v2/internal/gamepaddb"
 	"github.com/hajimehoshi/ebiten/v2/internal/glfw"
 )
 
@@ -40,7 +40,8 @@ type gamepad struct {
 	axes          [16]float64
 	buttonNum     int
 	buttonPressed [256]bool
-	state         *glfw.GamepadState
+	hatsNum       int
+	hats          [16]int
 }
 
 type Input struct {
@@ -319,12 +320,6 @@ func (i *Input) update(window *glfw.Window, context driver.UIContext) {
 			continue
 		}
 
-		i.gamepads[id].state = id.GetGamepadState()
-
-		// Note that GLFW's gamepad GUID follows SDL's GUID.
-		i.gamepads[id].guid = id.GetGUID()
-		i.gamepads[id].name = id.GetName()
-
 		buttons := id.GetButtons()
 
 		// A gamepad can be detected even though there are not. Apparently, some special devices are
@@ -354,6 +349,20 @@ func (i *Input) update(window *glfw.Window, context driver.UIContext) {
 			}
 			i.gamepads[id].axes[a] = float64(axes32[a])
 		}
+
+		hats := id.GetHats()
+		i.gamepads[id].hatsNum = len(hats)
+		for h := 0; h < len(i.gamepads[id].hats); h++ {
+			if len(hats) <= h {
+				i.gamepads[id].hats[h] = 0
+				continue
+			}
+			i.gamepads[id].hats[h] = int(hats[h])
+		}
+
+		// Note that GLFW's gamepad GUID follows SDL's GUID.
+		i.gamepads[id].guid = id.GetGUID()
+		i.gamepads[id].name = id.GetName()
 	}
 }
 
@@ -365,7 +374,7 @@ func (i *Input) IsStandardGamepadLayoutAvailable(id driver.GamepadID) bool {
 		return false
 	}
 	g := i.gamepads[int(id)]
-	return g.state != nil
+	return gamepaddb.HasStandardLayoutMapping(g.guid)
 }
 
 func (i *Input) StandardGamepadAxisValue(id driver.GamepadID, axis driver.StandardGamepadAxis) float64 {
@@ -376,10 +385,7 @@ func (i *Input) StandardGamepadAxisValue(id driver.GamepadID, axis driver.Standa
 		return 0
 	}
 	g := i.gamepads[int(id)]
-	if g.state == nil {
-		return 0
-	}
-	return float64(g.state.Axes[standardAxisToGLFWAxis(axis)])
+	return gamepaddb.AxisValue(g.guid, axis, gamepadState{&g})
 }
 
 func (i *Input) IsStandardGamepadButtonPressed(id driver.GamepadID, button driver.StandardGamepadButton) bool {
@@ -390,89 +396,37 @@ func (i *Input) IsStandardGamepadButtonPressed(id driver.GamepadID, button drive
 		return false
 	}
 	g := i.gamepads[int(id)]
-	if g.state == nil {
-		return false
-	}
-	switch button {
-	case driver.StandardGamepadButtonFrontBottomLeft:
-		return g.state.Axes[glfw.AxisLeftTrigger] > 0
-	case driver.StandardGamepadButtonFrontBottomRight:
-		return g.state.Axes[glfw.AxisRightTrigger] > 0
-	}
-	return g.state.Buttons[standardButtonToGLFWButton(button)] == glfw.Press
+	return gamepaddb.IsButtonPressed(g.guid, button, gamepadState{&g})
 }
 
-func standardAxisToGLFWAxis(axis driver.StandardGamepadAxis) glfw.GamepadAxis {
-	switch axis {
-	case driver.StandardGamepadAxisLeftStickHorizontal:
-		return glfw.AxisLeftX
-	case driver.StandardGamepadAxisLeftStickVertical:
-		return glfw.AxisLeftY
-	case driver.StandardGamepadAxisRightStickHorizontal:
-		return glfw.AxisRightX
-	case driver.StandardGamepadAxisRightStickVertical:
-		return glfw.AxisRightY
-	default:
-		panic(fmt.Sprintf("glfw: invalid or inconvertible StandardGamepadAxis: %d", axis))
+func init() {
+	// Confirm that all the hat state values are the same.
+	if gamepaddb.HatUp != glfw.HatUp {
+		panic("glfw: gamepaddb.HatUp must equal to glfw.HatUp but not")
+	}
+	if gamepaddb.HatRight != glfw.HatRight {
+		panic("glfw: gamepaddb.HatRight must equal to glfw.HatRight but not")
+	}
+	if gamepaddb.HatDown != glfw.HatDown {
+		panic("glfw: gamepaddb.HatDown must equal to glfw.HatDown but not")
+	}
+	if gamepaddb.HatLeft != glfw.HatLeft {
+		panic("glfw: gamepaddb.HatLeft must equal to glfw.HatLeft but not")
 	}
 }
 
-func standardButtonToGLFWButton(button driver.StandardGamepadButton) glfw.GamepadButton {
-	switch button {
-	case driver.StandardGamepadButtonRightBottom:
-		return glfw.ButtonA
-	case driver.StandardGamepadButtonRightRight:
-		return glfw.ButtonB
-	case driver.StandardGamepadButtonRightLeft:
-		return glfw.ButtonX
-	case driver.StandardGamepadButtonRightTop:
-		return glfw.ButtonY
-	case driver.StandardGamepadButtonFrontTopLeft:
-		return glfw.ButtonLeftBumper
-	case driver.StandardGamepadButtonFrontTopRight:
-		return glfw.ButtonRightBumper
-	case driver.StandardGamepadButtonCenterLeft:
-		return glfw.ButtonBack
-	case driver.StandardGamepadButtonCenterRight:
-		return glfw.ButtonStart
-	case driver.StandardGamepadButtonLeftStick:
-		return glfw.ButtonLeftThumb
-	case driver.StandardGamepadButtonRightStick:
-		return glfw.ButtonRightThumb
-	case driver.StandardGamepadButtonLeftTop:
-		return glfw.ButtonDpadUp
-	case driver.StandardGamepadButtonLeftBottom:
-		return glfw.ButtonDpadDown
-	case driver.StandardGamepadButtonLeftLeft:
-		return glfw.ButtonDpadLeft
-	case driver.StandardGamepadButtonLeftRight:
-		return glfw.ButtonDpadRight
-	case driver.StandardGamepadButtonCenterCenter:
-		return glfw.ButtonGuide
-	default:
-		panic(fmt.Sprintf("glfw: invalid or inconvertible StandardGamepadButton: %d", button))
-	}
+type gamepadState struct {
+	g *gamepad
 }
 
-// UpdateStandardGamepadLayoutMappings can be used to provide new gamepad mappings to Ebiten.
-// The string must be in the format of SDL_GameControllerDB.
-func (i *Input) UpdateStandardGamepadLayoutMappings(mapping string) (bool, error) {
-	var err error
-	if i.ui.isRunning() {
-		err = i.ui.t.Call(func() error {
-			return i.updateStandardGamepadLayoutMappings(mapping)
-		})
-	} else {
-		err = i.updateStandardGamepadLayoutMappings(mapping)
-	}
-	return err == nil, err
+func (s gamepadState) Axis(index int) float64 {
+	return s.g.axes[index]
 }
 
-func (i *Input) updateStandardGamepadLayoutMappings(mapping string) error {
-	if !glfw.UpdateGamepadMappings(mapping) {
-		// Would be nice if we could actually get the error string.
-		// However, go-gl currently does not provide it in any way.
-		return fmt.Errorf("glfw: could not parse or update gamepad mappings")
-	}
-	return nil
+func (s gamepadState) Button(index int) bool {
+	return s.g.buttonPressed[index]
+}
+
+func (s gamepadState) Hat(index int) int {
+	return s.g.hats[index]
 }

internal/uidriver/glfw/ui.go

@@ -172,10 +172,6 @@ func initialize() error {
 		return err
 	}
 
-	if !glfw.UpdateGamepadMappings(string(gamecontrollerdbTxt)) {
-		return fmt.Errorf("glfw: UpdateGamepadMappings failed")
-	}
-
 	glfw.WindowHint(glfw.Visible, glfw.False)
 	glfw.WindowHint(glfw.ClientAPI, glfw.NoAPI)
 

internal/uidriver/js/input_js.go

@@ -496,9 +496,3 @@ func (i *Input) IsStandardGamepadButtonPressed(id driver.GamepadID, button drive
 	}
 	return g.standardButtonPressed[button]
 }
-
-// UpdateStandardGamepadLayoutMappings is not supported for JS - the browser maintains the mappings.
-func (i *Input) UpdateStandardGamepadLayoutMappings(mapping string) (bool, error) {
-	// All OK - browser owns this though.
-	return false, nil
-}

internal/uidriver/mobile/input.go

@@ -147,13 +147,6 @@ func (i *Input) StandardGamepadAxisValue(id driver.GamepadID, axis driver.Standa
 	return 0
 }
 
-// UpdateStandardGamepadLayoutMappings is not supported on mobile - this still needs to be implemented.
-func (i *Input) UpdateStandardGamepadLayoutMappings(mapping string) (bool, error) {
-	// TODO: Implement this (#1557)
-	// Note: NOT returning an error, as mappings also do not matter right now (all functions above return nothing is pressed anyway).
-	return false, nil
-}
-
 func (i *Input) AppendTouchIDs(touchIDs []driver.TouchID) []driver.TouchID {
 	i.ui.m.RLock()
 	defer i.ui.m.RUnlock()