input: driver.Key now distinguishes left/right modifier keys

This is a preparation for event package, that will have key enum.

Updates #926

examples/keyboard/main.go

@@ -46,7 +46,7 @@ func init() {
 }
 
 func update(screen *ebiten.Image) error {
-	pressed := []ebiten.Key{}
+	var pressed []ebiten.Key
 	for k := ebiten.Key(0); k <= ebiten.KeyMax; k++ {
 		if ebiten.IsKeyPressed(k) {
 			pressed = append(pressed, k)

genkeys.go

@@ -88,10 +88,13 @@ func init() {
 	nameToJSKeyCodes = map[string][]string{
 		"Comma":        {"Comma"},
 		"Period":       {"Period"},
-		"Alt":          {"AltLeft", "AltRight"},
+		"LeftAlt":      {"AltLeft"},
+		"RightAlt":     {"AltRight"},
 		"CapsLock":     {"CapsLock"},
-		"Control":      {"ControlLeft", "ControlRight"},
+		"LeftControl":  {"ControlLeft"},
-		"Shift":        {"ShiftLeft", "ShiftRight"},
+		"RightControl": {"ControlRight"},
+		"LeftShift":    {"ShiftLeft"},
+		"RightShift":   {"ShiftRight"},
 		"Enter":        {"Enter"},
 		"Space":        {"Space"},
 		"Tab":          {"Tab"},
@@ -164,13 +167,14 @@ func init() {
 }
 
 func init() {
+	// TODO: How should we treat modifier keys? Now 'left' modifier keys are available.
 	keyCodeToNameEdge = map[int]string{
 		0xbc: "Comma",
 		0xbe: "Period",
-		0x12: "Alt",
+		0x12: "LeftAlt",
 		0x14: "CapsLock",
-		0x11: "Control",
+		0x11: "LeftControl",
-		0x10: "Shift",
+		0x10: "LeftShift",
 		0x0D: "Enter",
 		0x20: "Space",
 		0x09: "Tab",
@@ -249,10 +253,23 @@ type Key int
 
 // Keys.
 const (
-{{range $index, $name := .EbitenKeyNames}}Key{{$name}} Key = Key(driver.Key{{$name}})
+{{range $index, $name := .EbitenKeyNamesWithoutMods}}Key{{$name}} Key = Key(driver.Key{{$name}})
-{{end}}	KeyMax Key = Key{{.LastEbitenKeyName}}
+{{end}}	KeyAlt Key = Key(driver.KeyReserved0)
+	KeyControl Key = Key(driver.KeyReserved1)
+	KeyShift Key = Key(driver.KeyReserved2)
+	KeyMax Key = KeyShift
 )
 
+func (k Key) isValid() bool {
+	switch k {
+	{{range $name := .EbitenKeyNames}}case Key{{$name}}:
+		return true
+	{{end}}
+	default:
+		return false
+	}
+}
+
 // String returns a string representing the key.
 //
 // If k is an undefined key, String returns an empty string.
@@ -282,8 +299,10 @@ package driver
 type Key int
 
 const (
-{{range $index, $name := .EbitenKeyNames}}Key{{$name}}{{if eq $index 0}} Key = iota{{end}}
+{{range $index, $name := .DriverKeyNames}}Key{{$name}}{{if eq $index 0}} Key = iota{{end}}
-{{end}}
+{{end}}	KeyReserved0
+	KeyReserved1
+	KeyReserved2
 )
 `
 
@@ -301,14 +320,8 @@ import (
 )
 
 var glfwKeyCodeToKey = map[glfw.Key]driver.Key{
-{{range $index, $name := .EbitenKeyNamesWithoutMods}}glfw.Key{{$name}}: driver.Key{{$name}},
+{{range $index, $name := .DriverKeyNames}}glfw.Key{{$name}}: driver.Key{{$name}},
 {{end}}
-	glfw.KeyLeftAlt:      driver.KeyAlt,
-	glfw.KeyRightAlt:     driver.KeyAlt,
-	glfw.KeyLeftControl:  driver.KeyControl,
-	glfw.KeyRightControl: driver.KeyControl,
-	glfw.KeyLeftShift:    driver.KeyShift,
-	glfw.KeyRightShift:   driver.KeyShift,
 }
 `
 
@@ -442,15 +455,31 @@ func main() {
 
 	ebitenKeyNames := []string{}
 	ebitenKeyNamesWithoutMods := []string{}
+	driverKeyNames := []string{}
 	for name := range nameToJSKeyCodes {
+		driverKeyNames = append(driverKeyNames, name)
+		if !strings.HasSuffix(name, "Alt") && !strings.HasSuffix(name, "Control") && !strings.HasSuffix(name, "Shift") {
 			ebitenKeyNames = append(ebitenKeyNames, name)
-		if name != "Alt" && name != "Control" && name != "Shift" {
 			ebitenKeyNamesWithoutMods = append(ebitenKeyNamesWithoutMods, name)
+			continue
+		}
+		if name == "LeftAlt" {
+			ebitenKeyNames = append(ebitenKeyNames, "Alt")
+			continue
+		}
+		if name == "LeftControl" {
+			ebitenKeyNames = append(ebitenKeyNames, "Control")
+			continue
+		}
+		if name == "LeftShift" {
+			ebitenKeyNames = append(ebitenKeyNames, "Shift")
+			continue
 		}
 	}
 
 	sort.Slice(ebitenKeyNames, keyNamesLess(ebitenKeyNames))
 	sort.Slice(ebitenKeyNamesWithoutMods, keyNamesLess(ebitenKeyNamesWithoutMods))
+	sort.Slice(driverKeyNames, keyNamesLess(driverKeyNames))
 
 	for path, tmpl := range map[string]string{
 		"keys.go":                        ebitenKeysTmpl,
@@ -494,7 +523,7 @@ func main() {
 			KeyCodeToNameEdge         map[int]string
 			EbitenKeyNames            []string
 			EbitenKeyNamesWithoutMods []string
-			LastEbitenKeyName         string
+			DriverKeyNames            []string
 			NameToGLFWKeys            map[string]glfw.Key
 		}{
 			License:                   license,
@@ -504,7 +533,7 @@ func main() {
 			KeyCodeToNameEdge:         keyCodeToNameEdge,
 			EbitenKeyNames:            ebitenKeyNames,
 			EbitenKeyNamesWithoutMods: ebitenKeyNamesWithoutMods,
-			LastEbitenKeyName:         ebitenKeyNames[len(ebitenKeyNames)-1],
+			DriverKeyNames:            driverKeyNames,
 			NameToGLFWKeys:            nameToGLFWKeys,
 		}); err != nil {
 			log.Fatal(err)

input.go

@@ -42,7 +42,29 @@ func InputChars() []rune {
 //
 // IsKeyPressed is concurrent-safe.
 func IsKeyPressed(key Key) bool {
-	return uidriver.Get().Input().IsKeyPressed(driver.Key(key))
+	// There are keys that are invalid values as ebiten.Key (e.g., driver.KeyLeftAlt).
+	// Skip such values.
+	if !key.isValid() {
+		return false
+	}
+
+	var keys []driver.Key
+	switch key {
+	case KeyAlt:
+		keys = append(keys, driver.KeyLeftAlt, driver.KeyRightAlt)
+	case KeyControl:
+		keys = append(keys, driver.KeyLeftControl, driver.KeyRightControl)
+	case KeyShift:
+		keys = append(keys, driver.KeyLeftShift, driver.KeyRightShift)
+	default:
+		keys = append(keys, driver.Key(key))
+	}
+	for _, k := range keys {
+		if uidriver.Get().Input().IsKeyPressed(k) {
+			return true
+		}
+	}
+	return false
 }
 
 // CursorPosition returns a position of a mouse cursor relative to the game screen (window). The cursor position is

internal/driver/keys.go

@@ -55,13 +55,11 @@ const (
 	KeyX
 	KeyY
 	KeyZ
-	KeyAlt
 	KeyApostrophe
 	KeyBackslash
 	KeyBackspace
 	KeyCapsLock
 	KeyComma
-	KeyControl
 	KeyDelete
 	KeyDown
 	KeyEnd
@@ -101,7 +99,10 @@ const (
 	KeyKPMultiply
 	KeyKPSubtract
 	KeyLeft
+	KeyLeftAlt
 	KeyLeftBracket
+	KeyLeftControl
+	KeyLeftShift
 	KeyMenu
 	KeyMinus
 	KeyNumLock
@@ -111,12 +112,17 @@ const (
 	KeyPeriod
 	KeyPrintScreen
 	KeyRight
+	KeyRightAlt
 	KeyRightBracket
+	KeyRightControl
+	KeyRightShift
 	KeyScrollLock
 	KeySemicolon
-	KeyShift
 	KeySlash
 	KeySpace
 	KeyTab
 	KeyUp
+	KeyReserved0
+	KeyReserved1
+	KeyReserved2
 )

internal/uidriver/glfw/keys.go

@@ -107,7 +107,10 @@ var glfwKeyCodeToKey = map[glfw.Key]driver.Key{
 	glfw.KeyKPMultiply:   driver.KeyKPMultiply,
 	glfw.KeyKPSubtract:   driver.KeyKPSubtract,
 	glfw.KeyLeft:         driver.KeyLeft,
+	glfw.KeyLeftAlt:      driver.KeyLeftAlt,
 	glfw.KeyLeftBracket:  driver.KeyLeftBracket,
+	glfw.KeyLeftControl:  driver.KeyLeftControl,
+	glfw.KeyLeftShift:    driver.KeyLeftShift,
 	glfw.KeyMenu:         driver.KeyMenu,
 	glfw.KeyMinus:        driver.KeyMinus,
 	glfw.KeyNumLock:      driver.KeyNumLock,
@@ -117,18 +120,14 @@ var glfwKeyCodeToKey = map[glfw.Key]driver.Key{
 	glfw.KeyPeriod:       driver.KeyPeriod,
 	glfw.KeyPrintScreen:  driver.KeyPrintScreen,
 	glfw.KeyRight:        driver.KeyRight,
+	glfw.KeyRightAlt:     driver.KeyRightAlt,
 	glfw.KeyRightBracket: driver.KeyRightBracket,
+	glfw.KeyRightControl: driver.KeyRightControl,
+	glfw.KeyRightShift:   driver.KeyRightShift,
 	glfw.KeyScrollLock:   driver.KeyScrollLock,
 	glfw.KeySemicolon:    driver.KeySemicolon,
 	glfw.KeySlash:        driver.KeySlash,
 	glfw.KeySpace:        driver.KeySpace,
 	glfw.KeyTab:          driver.KeyTab,
 	glfw.KeyUp:           driver.KeyUp,
-
-	glfw.KeyLeftAlt:      driver.KeyAlt,
-	glfw.KeyRightAlt:     driver.KeyAlt,
-	glfw.KeyLeftControl:  driver.KeyControl,
-	glfw.KeyRightControl: driver.KeyControl,
-	glfw.KeyLeftShift:    driver.KeyShift,
-	glfw.KeyRightShift:   driver.KeyShift,
 }

internal/uidriver/js/keys.go

@@ -56,9 +56,6 @@ var keyToCodes = map[driver.Key][]string{
 	driver.KeyA: {
 		"KeyA",
 	},
-	driver.KeyAlt: {
-		"AltLeft", "AltRight",
-	},
 	driver.KeyApostrophe: {
 		"Quote",
 	},
@@ -80,9 +77,6 @@ var keyToCodes = map[driver.Key][]string{
 	driver.KeyComma: {
 		"Comma",
 	},
-	driver.KeyControl: {
-		"ControlLeft", "ControlRight",
-	},
 	driver.KeyD: {
 		"KeyD",
 	},
@@ -227,9 +221,18 @@ var keyToCodes = map[driver.Key][]string{
 	driver.KeyLeft: {
 		"ArrowLeft",
 	},
+	driver.KeyLeftAlt: {
+		"AltLeft",
+	},
 	driver.KeyLeftBracket: {
 		"BracketLeft",
 	},
+	driver.KeyLeftControl: {
+		"ControlLeft",
+	},
+	driver.KeyLeftShift: {
+		"ShiftLeft",
+	},
 	driver.KeyM: {
 		"KeyM",
 	},
@@ -275,9 +278,18 @@ var keyToCodes = map[driver.Key][]string{
 	driver.KeyRight: {
 		"ArrowRight",
 	},
+	driver.KeyRightAlt: {
+		"AltRight",
+	},
 	driver.KeyRightBracket: {
 		"BracketRight",
 	},
+	driver.KeyRightControl: {
+		"ControlRight",
+	},
+	driver.KeyRightShift: {
+		"ShiftRight",
+	},
 	driver.KeyS: {
 		"KeyS",
 	},
@@ -287,9 +299,6 @@ var keyToCodes = map[driver.Key][]string{
 	driver.KeySemicolon: {
 		"Semicolon",
 	},
-	driver.KeyShift: {
-		"ShiftLeft", "ShiftRight",
-	},
 	driver.KeySlash: {
 		"Slash",
 	},
@@ -329,9 +338,9 @@ var keyCodeToKeyEdge = map[int]driver.Key{
 	8:   driver.KeyBackspace,
 	9:   driver.KeyTab,
 	13:  driver.KeyEnter,
-	16:  driver.KeyShift,
+	16:  driver.KeyLeftShift,
-	17:  driver.KeyControl,
+	17:  driver.KeyLeftControl,
-	18:  driver.KeyAlt,
+	18:  driver.KeyLeftAlt,
 	19:  driver.KeyPause,
 	20:  driver.KeyCapsLock,
 	27:  driver.KeyEscape,

keys.go

@@ -65,13 +65,11 @@ const (
 	KeyX            Key = Key(driver.KeyX)
 	KeyY            Key = Key(driver.KeyY)
 	KeyZ            Key = Key(driver.KeyZ)
-	KeyAlt          Key = Key(driver.KeyAlt)
 	KeyApostrophe   Key = Key(driver.KeyApostrophe)
 	KeyBackslash    Key = Key(driver.KeyBackslash)
 	KeyBackspace    Key = Key(driver.KeyBackspace)
 	KeyCapsLock     Key = Key(driver.KeyCapsLock)
 	KeyComma        Key = Key(driver.KeyComma)
-	KeyControl      Key = Key(driver.KeyControl)
 	KeyDelete       Key = Key(driver.KeyDelete)
 	KeyDown         Key = Key(driver.KeyDown)
 	KeyEnd          Key = Key(driver.KeyEnd)
@@ -124,14 +122,224 @@ const (
 	KeyRightBracket Key = Key(driver.KeyRightBracket)
 	KeyScrollLock   Key = Key(driver.KeyScrollLock)
 	KeySemicolon    Key = Key(driver.KeySemicolon)
-	KeyShift        Key = Key(driver.KeyShift)
 	KeySlash        Key = Key(driver.KeySlash)
 	KeySpace        Key = Key(driver.KeySpace)
 	KeyTab          Key = Key(driver.KeyTab)
 	KeyUp           Key = Key(driver.KeyUp)
-	KeyMax          Key = KeyUp
+	KeyAlt          Key = Key(driver.KeyReserved0)
+	KeyControl      Key = Key(driver.KeyReserved1)
+	KeyShift        Key = Key(driver.KeyReserved2)
+	KeyMax          Key = KeyShift
 )
 
+func (k Key) isValid() bool {
+	switch k {
+	case Key0:
+		return true
+	case Key1:
+		return true
+	case Key2:
+		return true
+	case Key3:
+		return true
+	case Key4:
+		return true
+	case Key5:
+		return true
+	case Key6:
+		return true
+	case Key7:
+		return true
+	case Key8:
+		return true
+	case Key9:
+		return true
+	case KeyA:
+		return true
+	case KeyB:
+		return true
+	case KeyC:
+		return true
+	case KeyD:
+		return true
+	case KeyE:
+		return true
+	case KeyF:
+		return true
+	case KeyG:
+		return true
+	case KeyH:
+		return true
+	case KeyI:
+		return true
+	case KeyJ:
+		return true
+	case KeyK:
+		return true
+	case KeyL:
+		return true
+	case KeyM:
+		return true
+	case KeyN:
+		return true
+	case KeyO:
+		return true
+	case KeyP:
+		return true
+	case KeyQ:
+		return true
+	case KeyR:
+		return true
+	case KeyS:
+		return true
+	case KeyT:
+		return true
+	case KeyU:
+		return true
+	case KeyV:
+		return true
+	case KeyW:
+		return true
+	case KeyX:
+		return true
+	case KeyY:
+		return true
+	case KeyZ:
+		return true
+	case KeyAlt:
+		return true
+	case KeyApostrophe:
+		return true
+	case KeyBackslash:
+		return true
+	case KeyBackspace:
+		return true
+	case KeyCapsLock:
+		return true
+	case KeyComma:
+		return true
+	case KeyControl:
+		return true
+	case KeyDelete:
+		return true
+	case KeyDown:
+		return true
+	case KeyEnd:
+		return true
+	case KeyEnter:
+		return true
+	case KeyEqual:
+		return true
+	case KeyEscape:
+		return true
+	case KeyF1:
+		return true
+	case KeyF2:
+		return true
+	case KeyF3:
+		return true
+	case KeyF4:
+		return true
+	case KeyF5:
+		return true
+	case KeyF6:
+		return true
+	case KeyF7:
+		return true
+	case KeyF8:
+		return true
+	case KeyF9:
+		return true
+	case KeyF10:
+		return true
+	case KeyF11:
+		return true
+	case KeyF12:
+		return true
+	case KeyGraveAccent:
+		return true
+	case KeyHome:
+		return true
+	case KeyInsert:
+		return true
+	case KeyKP0:
+		return true
+	case KeyKP1:
+		return true
+	case KeyKP2:
+		return true
+	case KeyKP3:
+		return true
+	case KeyKP4:
+		return true
+	case KeyKP5:
+		return true
+	case KeyKP6:
+		return true
+	case KeyKP7:
+		return true
+	case KeyKP8:
+		return true
+	case KeyKP9:
+		return true
+	case KeyKPAdd:
+		return true
+	case KeyKPDecimal:
+		return true
+	case KeyKPDivide:
+		return true
+	case KeyKPEnter:
+		return true
+	case KeyKPEqual:
+		return true
+	case KeyKPMultiply:
+		return true
+	case KeyKPSubtract:
+		return true
+	case KeyLeft:
+		return true
+	case KeyLeftBracket:
+		return true
+	case KeyMenu:
+		return true
+	case KeyMinus:
+		return true
+	case KeyNumLock:
+		return true
+	case KeyPageDown:
+		return true
+	case KeyPageUp:
+		return true
+	case KeyPause:
+		return true
+	case KeyPeriod:
+		return true
+	case KeyPrintScreen:
+		return true
+	case KeyRight:
+		return true
+	case KeyRightBracket:
+		return true
+	case KeyScrollLock:
+		return true
+	case KeySemicolon:
+		return true
+	case KeyShift:
+		return true
+	case KeySlash:
+		return true
+	case KeySpace:
+		return true
+	case KeyTab:
+		return true
+	case KeyUp:
+		return true
+
+	default:
+		return false
+	}
+}
+
 // String returns a string representing the key.
 //
 // If k is an undefined key, String returns an empty string.