internal/gamepad: port the gamepad part for c-backend

internal/cbackend/cbackend.go

@@ -71,10 +71,10 @@ import (
 )
 
 type Gamepad struct {
-	ID            driver.GamepadID
+	ID            int
 	Standard      bool
-	ButtonNum     int
-	AxisNum       int
+	ButtonCount   int
+	AxisCount     int
 	ButtonPressed [32]bool
 	ButtonValues  [32]float64
 	AxisValues    [16]float64
@@ -119,16 +119,16 @@ func AppendGamepads(gamepads []Gamepad) []Gamepad {
 
 	for _, g := range cGamepads {
 		gamepad := Gamepad{
-			ID:        driver.GamepadID(g.id),
+			ID:          int(g.id),
 			Standard:    g.standard != 0,
-			ButtonNum: int(g.button_num),
-			AxisNum:   int(g.axis_num),
+			ButtonCount: int(g.button_num),
+			AxisCount:   int(g.axis_num),
 		}
-		for i := 0; i < gamepad.ButtonNum; i++ {
+		for i := 0; i < gamepad.ButtonCount; i++ {
 			gamepad.ButtonPressed[i] = g.button_pressed[i] != 0
 			gamepad.ButtonValues[i] = float64(g.button_values[i])
 		}
-		for i := 0; i < gamepad.AxisNum; i++ {
+		for i := 0; i < gamepad.AxisCount; i++ {
 			gamepad.AxisValues[i] = float64(g.axis_values[i])
 		}
 
@@ -161,7 +161,7 @@ func AppendTouches(touches []Touch) []Touch {
 	return touches
 }
 
-func VibrateGamepad(id driver.GamepadID, duration time.Duration, strongMagnitude float64, weakMagnitude float64) {
+func VibrateGamepad(id int, duration time.Duration, strongMagnitude float64, weakMagnitude float64) {
 	C.EbitenVibrateGamepad(C.int(id), C.double(float64(duration)/float64(time.Second)), C.double(strongMagnitude), C.double(weakMagnitude))
 }
 

internal/gamepad/api_ios.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build ios
-// +build ios
+//go:build ios && !ebitencbackend
+// +build ios,!ebitencbackend
 
 package gamepad
 

internal/gamepad/api_linux.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !android
-// +build !android
+//go:build !android && !ebitencbackend
+// +build !android,!ebitencbackend
 
 package gamepad
 

internal/gamepad/api_windows.go

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !ebitencbackend
+// +build !ebitencbackend
+
 package gamepad
 
 import (

internal/gamepad/extern_android.go

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !ebitencbackend
+// +build !ebitencbackend
+
 package gamepad
 
 import (

internal/gamepad/gamepad_android.go

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !ebitencbackend
+// +build !ebitencbackend
+
 package gamepad
 
 import (

internal/gamepad/gamepad_cbackend.go

@@ -0,0 +1,133 @@
+// Copyright 2022 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 ebitencbackend
+// +build ebitencbackend
+
+package gamepad
+
+import (
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/cbackend"
+)
+
+type nativeGamepads struct {
+	gamepads []cbackend.Gamepad
+	ids      map[int]struct{}
+}
+
+func (*nativeGamepads) init(gamepads *gamepads) error {
+	return nil
+}
+
+func (g *nativeGamepads) update(gamepads *gamepads) error {
+	g.gamepads = g.gamepads[:0]
+	g.gamepads = cbackend.AppendGamepads(g.gamepads)
+
+	for id := range g.ids {
+		delete(g.ids, id)
+	}
+
+	for _, gp := range g.gamepads {
+		if g.ids == nil {
+			g.ids = map[int]struct{}{}
+		}
+		g.ids[gp.ID] = struct{}{}
+
+		gamepad := gamepads.find(func(gamepad *Gamepad) bool {
+			return gamepad.id == gp.ID
+		})
+		if gamepad == nil {
+			gamepad = gamepads.add("", "")
+			gamepad.id = gp.ID
+			gamepad.standard = gp.Standard
+			gamepad.axisValues = make([]float64, gp.AxisCount)
+			gamepad.buttonPressed = make([]bool, gp.ButtonCount)
+			gamepad.buttonValues = make([]float64, gp.ButtonCount)
+		}
+
+		gamepad.m.Lock()
+		copy(gamepad.axisValues, gp.AxisValues[:])
+		copy(gamepad.buttonValues, gp.ButtonValues[:])
+		copy(gamepad.buttonPressed, gp.ButtonPressed[:])
+		gamepad.m.Unlock()
+	}
+
+	// Remove an unused gamepads.
+	gamepads.remove(func(gamepad *Gamepad) bool {
+		_, ok := g.ids[gamepad.id]
+		return !ok
+	})
+
+	return nil
+}
+
+type nativeGamepad struct {
+	id       int
+	standard bool
+
+	axisValues    []float64
+	buttonPressed []bool
+	buttonValues  []float64
+}
+
+func (*nativeGamepad) update(gamepad *gamepads) error {
+	return nil
+}
+
+func (g *nativeGamepad) hasOwnStandardLayoutMapping() bool {
+	return g.standard
+}
+
+func (g *nativeGamepad) axisCount() int {
+	return len(g.axisValues)
+}
+
+func (g *nativeGamepad) buttonCount() int {
+	return len(g.buttonValues)
+}
+
+func (g *nativeGamepad) hatCount() int {
+	return 0
+}
+
+func (g *nativeGamepad) axisValue(axis int) float64 {
+	if axis < 0 || axis >= len(g.axisValues) {
+		return 0
+	}
+	return g.axisValues[axis]
+}
+
+func (g *nativeGamepad) isButtonPressed(button int) bool {
+	if button < 0 || button >= len(g.buttonPressed) {
+		return false
+	}
+	return g.buttonPressed[button]
+}
+
+func (g *nativeGamepad) buttonValue(button int) float64 {
+	if button < 0 || button >= len(g.buttonValues) {
+		return 0
+	}
+	return g.buttonValues[button]
+}
+
+func (*nativeGamepad) hatState(hat int) int {
+	return hatCentered
+}
+
+func (g *nativeGamepad) vibrate(duration time.Duration, strongMagnitude float64, weakMagnitude float64) {
+	cbackend.VibrateGamepad(g.id, duration, strongMagnitude, weakMagnitude)
+}

internal/gamepad/gamepad_darwin.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !ios
-// +build !ios
+//go:build !ios && !ebitencbackend
+// +build !ios,!ebitencbackend
 
 package gamepad
 

internal/gamepad/gamepad_ios.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build ios
-// +build ios
+//go:build ios && !ebitencbackend
+// +build ios,!ebitencbackend
 
 package gamepad
 

internal/gamepad/gamepad_linux.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !android
-// +build !android
+//go:build !android && !ebitencbackend
+// +build !android,!ebitencbackend
 
 package gamepad
 

internal/gamepad/gamepad_windows.go

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !ebitencbackend
+// +build !ebitencbackend
+
 package gamepad
 
 import (

internal/uidriver/cbackend/gamepad.go

@@ -20,191 +20,98 @@ package cbackend
 import (
 	"time"
 
-	"github.com/hajimehoshi/ebiten/v2/internal/cbackend"
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
+	"github.com/hajimehoshi/ebiten/v2/internal/gamepad"
 )
 
-func (i *Input) updateGamepads() {
-	i.gamepads = i.gamepads[:0]
-	i.gamepads = cbackend.AppendGamepads(i.gamepads)
-}
-
 func (i *Input) AppendGamepadIDs(gamepadIDs []driver.GamepadID) []driver.GamepadID {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		gamepadIDs = append(gamepadIDs, g.ID)
-	}
-	return gamepadIDs
+	return gamepad.AppendGamepadIDs(gamepadIDs)
 }
 
 func (i *Input) GamepadSDLID(id driver.GamepadID) string {
+	g := gamepad.Get(id)
+	if g == nil {
 		return ""
 	}
+	return g.SDLID()
+}
 
 func (i *Input) GamepadName(id driver.GamepadID) string {
+	g := gamepad.Get(id)
+	if g == nil {
 		return ""
 	}
+	return g.Name()
+}
 
 func (i *Input) GamepadAxisValue(id driver.GamepadID, axis int) float64 {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		if axis < 0 {
+	g := gamepad.Get(id)
+	if g == nil {
 		return 0
 	}
-		if g.AxisNum <= axis {
-			return 0
-		}
-		if len(g.AxisValues) <= axis {
-			return 0
-		}
-		return g.AxisValues[axis]
-	}
-	return 0
+	return g.Axis(axis)
 }
 
 func (i *Input) GamepadAxisNum(id driver.GamepadID) int {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		return g.AxisNum
-	}
+	g := gamepad.Get(id)
+	if g == nil {
 		return 0
 	}
+	return g.AxisCount()
+}
 
 func (i *Input) GamepadButtonNum(id driver.GamepadID) int {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		return g.ButtonNum
-	}
+	g := gamepad.Get(id)
+	if g == nil {
 		return 0
 	}
+	return g.ButtonCount()
+}
 
 func (i *Input) IsGamepadButtonPressed(id driver.GamepadID, button driver.GamepadButton) bool {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		if button < 0 {
+	g := gamepad.Get(id)
+	if g == nil {
 		return false
 	}
-		if g.ButtonNum <= int(button) {
-			return false
-		}
-		if len(g.ButtonPressed) <= int(button) {
-			return false
-		}
-		return g.ButtonPressed[button]
-	}
-	return false
+	return g.Button(int(button))
 }
 
 func (i *Input) IsStandardGamepadButtonPressed(id driver.GamepadID, button driver.StandardGamepadButton) bool {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		if !g.Standard {
+	g := gamepad.Get(id)
+	if g == nil {
 		return false
 	}
-		if button < 0 {
-			return false
-		}
-		if g.ButtonNum <= int(button) {
-			return false
-		}
-		if len(g.ButtonPressed) <= int(button) {
-			return false
-		}
-		return g.ButtonPressed[button]
-	}
-	return false
+	return g.IsStandardButtonPressed(button)
 }
 
 func (i *Input) IsStandardGamepadLayoutAvailable(id driver.GamepadID) bool {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		return g.Standard
-	}
+	g := gamepad.Get(id)
+	if g == nil {
 		return false
 	}
+	return g.IsStandardLayoutAvailable()
+}
 
 func (i *Input) StandardGamepadAxisValue(id driver.GamepadID, axis driver.StandardGamepadAxis) float64 {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		if !g.Standard {
+	g := gamepad.Get(id)
+	if g == nil {
 		return 0
 	}
-		if axis < 0 {
-			return 0
-		}
-		if g.AxisNum <= int(axis) {
-			return 0
-		}
-		if len(g.AxisValues) <= int(axis) {
-			return 0
-		}
-		return g.AxisValues[axis]
-	}
-	return 0
+	return g.StandardAxisValue(axis)
 }
 
 func (i *Input) StandardGamepadButtonValue(id driver.GamepadID, button driver.StandardGamepadButton) float64 {
-	i.m.Lock()
-	defer i.m.Unlock()
-
-	for _, g := range i.gamepads {
-		if g.ID != id {
-			continue
-		}
-		if !g.Standard {
+	g := gamepad.Get(id)
+	if g == nil {
 		return 0
 	}
-		if button < 0 {
-			return 0
-		}
-		if g.ButtonNum <= int(button) {
-			return 0
-		}
-		if len(g.ButtonValues) <= int(button) {
-			return 0
-		}
-		return g.ButtonValues[button]
-	}
-	return 0
+	return g.StandardButtonValue(button)
 }
 
 func (i *Input) VibrateGamepad(id driver.GamepadID, duration time.Duration, strongMagnitude float64, weakMagnitude float64) {
-	cbackend.VibrateGamepad(id, duration, strongMagnitude, weakMagnitude)
+	g := gamepad.Get(id)
+	if g == nil {
+		return
+	}
+	g.Vibrate(duration, strongMagnitude, weakMagnitude)
 }

internal/uidriver/cbackend/input.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/hajimehoshi/ebiten/v2/internal/cbackend"
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
+	"github.com/hajimehoshi/ebiten/v2/internal/gamepad"
 )
 
 type Input struct {
@@ -35,7 +36,7 @@ func (i *Input) update(context driver.UIContext) {
 	i.m.Lock()
 	defer i.m.Unlock()
 
-	i.updateGamepads()
+	gamepad.Update()
 
 	i.touches = i.touches[:0]
 	i.touches = cbackend.AppendTouches(i.touches)