Initial Kotlin Input Implementation

This commit contains the Kotlin side of the initial Input implementation, this is based on the work done in the `hid` branch in `bylaws/skyline`.
Co-authored-by: ◱ PixelyIon <pixelyion@protonmail.com>

app/src/main/cpp/emu_jni.cpp

@@ -98,10 +98,13 @@ extern "C" JNIEXPORT jfloat Java_emu_skyline_EmulationActivity_getFrametime(JNIE
 }
 
 extern "C" JNIEXPORT void JNICALL Java_emu_skyline_EmulationActivity_setButtonState(JNIEnv *, jobject, jlong id, jint state) {
+    if (input) {
         skyline::input::npad::NpadButton button{.raw = static_cast<skyline::u64>(id)};
         input->npad[0]->SetButtonState(button, static_cast<skyline::input::npad::NpadButtonState>(state));
     }
+}
 
 extern "C" JNIEXPORT void JNICALL Java_emu_skyline_EmulationActivity_setAxisValue(JNIEnv *, jobject, jint id, jint value) {
+    if (input)
         input->npad[0]->SetAxisValue(static_cast<skyline::input::npad::NpadAxisId>(id), value);
 }

app/src/main/cpp/skyline/input/npad.h

@@ -42,7 +42,6 @@ namespace skyline {
                 bool leftSr : 1; //!< Left Joy-Con SR button
                 bool rightSl : 1; //!< Right Joy-Con SL button
                 bool rightSr : 1; //!< Right Joy-Con SR button
-                bool touch : 1; //!< The touch button
             };
             u64 raw;
         };

app/src/main/cpp/skyline/services/hid/IAppletResource.cpp

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 // Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
 
+#include <input.h>
 #include "IAppletResource.h"
 
 namespace skyline::service::hid {
@@ -9,8 +10,7 @@ namespace skyline::service::hid {
     }) {}
 
     void IAppletResource::GetSharedMemoryHandle(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response) {
-        hidSharedMemory = std::make_shared<kernel::type::KSharedMemory>(state, NULL, constant::HidSharedMemSize, memory::Permission{true, false, false});
+        auto handle = state.process->InsertItem<type::KSharedMemory>(state.input->hidKMem);
-        auto handle = state.process->InsertItem<type::KSharedMemory>(hidSharedMemory);
         state.logger->Debug("HID Shared Memory Handle: 0x{:X}", handle);
 
         response.copyHandles.push_back(handle);

app/src/main/cpp/skyline/services/hid/IAppletResource.h

@@ -7,19 +7,12 @@
 #include <services/base_service.h>
 #include <services/serviceman.h>
 
-namespace skyline {
+namespace skyline::service::hid {
-    namespace constant {
-        constexpr auto HidSharedMemSize = 0x40000; //!< The size of HID Shared Memory (https://switchbrew.org/wiki/HID_Shared_Memory)
-    }
-
-    namespace service::hid {
     /**
      * @brief IAppletResource is used to get a handle to the HID shared memory (https://switchbrew.org/wiki/HID_services#IAppletResource)
      */
     class IAppletResource : public BaseService {
       public:
-            std::shared_ptr<type::KSharedMemory> hidSharedMemory; //!< A pointer to HID shared memory
-
         IAppletResource(const DeviceState &state, ServiceManager &manager);
 
         /**
@@ -28,4 +21,3 @@ namespace skyline {
         void GetSharedMemoryHandle(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response);
     };
 }
-}

app/src/main/java/emu/skyline/EmulationActivity.kt

@@ -15,9 +15,13 @@ import android.util.Log
 import android.view.*
 import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceManager
+import emu.skyline.input.ButtonState
+import emu.skyline.input.NpadAxis
+import emu.skyline.input.NpadButton
 import emu.skyline.loader.getRomFormat
 import kotlinx.android.synthetic.main.emu_activity.*
 import java.io.File
+import kotlin.math.abs
 
 class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback {
     init {
@@ -84,8 +88,14 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback {
      */
     private external fun getFrametime() : Float
 
+    /**
+     * This sets the state of a specific button
+     */
     private external fun setButtonState(id : Long, state : Int)
 
+    /**
+     * This sets the value of a specific axis
+     */
     private external fun setAxisValue(id : Int, value : Int)
 
     /**
@@ -210,4 +220,113 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback {
         surface = null
         setSurface(surface)
     }
+
+    /**
+     * This handles passing on any key events to libskyline
+     */
+    override fun dispatchKeyEvent(event : KeyEvent) : Boolean {
+        val action : ButtonState = when (event.action) {
+            KeyEvent.ACTION_DOWN -> ButtonState.Pressed
+            KeyEvent.ACTION_UP -> ButtonState.Released
+            else -> return false
+        }
+
+        val buttonMap : Map<Int, NpadButton> = mapOf(
+                KeyEvent.KEYCODE_BUTTON_A to NpadButton.A,
+                KeyEvent.KEYCODE_BUTTON_B to NpadButton.B,
+                KeyEvent.KEYCODE_BUTTON_X to NpadButton.X,
+                KeyEvent.KEYCODE_BUTTON_Y to NpadButton.Y,
+                KeyEvent.KEYCODE_BUTTON_THUMBL to NpadButton.L3,
+                KeyEvent.KEYCODE_BUTTON_THUMBR to NpadButton.R3,
+                KeyEvent.KEYCODE_BUTTON_L1 to NpadButton.L,
+                KeyEvent.KEYCODE_BUTTON_R1 to NpadButton.R,
+                KeyEvent.KEYCODE_BUTTON_L2 to NpadButton.ZL,
+                KeyEvent.KEYCODE_BUTTON_R2 to NpadButton.ZR,
+                KeyEvent.KEYCODE_BUTTON_START to NpadButton.Plus,
+                KeyEvent.KEYCODE_BUTTON_SELECT to NpadButton.Minus,
+                KeyEvent.KEYCODE_DPAD_DOWN to NpadButton.DpadDown,
+                KeyEvent.KEYCODE_DPAD_UP to NpadButton.DpadUp,
+                KeyEvent.KEYCODE_DPAD_LEFT to NpadButton.DpadLeft,
+                KeyEvent.KEYCODE_DPAD_RIGHT to NpadButton.DpadRight)
+
+        return try {
+            setButtonState(buttonMap.getValue(event.keyCode).value(), action.ordinal);
+            true
+        } catch (ignored : NoSuchElementException) {
+            super.dispatchKeyEvent(event)
+        }
+    }
+
+    /**
+     * This is the controller HAT X value
+     */
+    private var controllerHatX : Float = 0.0f
+
+    /**
+     * This is the controller HAT Y value
+     */
+    private var controllerHatY : Float = 0.0f
+
+    /**
+     * This handles passing on any motion events to libskyline
+     */
+    override fun dispatchGenericMotionEvent(event : MotionEvent) : Boolean {
+        if ((event.source and InputDevice.SOURCE_DPAD) == InputDevice.SOURCE_DPAD ||
+                (event.source and InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK) {
+            val hatXMap : Map<Float, NpadButton> = mapOf(
+                    -1.0f to NpadButton.DpadLeft,
+                    +1.0f to NpadButton.DpadRight)
+
+            val hatYMap : Map<Float, NpadButton> = mapOf(
+                    -1.0f to NpadButton.DpadUp,
+                    +1.0f to NpadButton.DpadDown)
+
+            if (controllerHatX != event.getAxisValue(MotionEvent.AXIS_HAT_X)) {
+                if (event.getAxisValue(MotionEvent.AXIS_HAT_X) == 0.0f)
+                    setButtonState(hatXMap.getValue(controllerHatX).value(), ButtonState.Released.ordinal)
+                else
+                    setButtonState(hatXMap.getValue(event.getAxisValue(MotionEvent.AXIS_HAT_X)).value(), ButtonState.Pressed.ordinal)
+
+                controllerHatX = event.getAxisValue(MotionEvent.AXIS_HAT_X)
+
+                return true
+            }
+
+            if (controllerHatY != event.getAxisValue(MotionEvent.AXIS_HAT_Y)) {
+                if (event.getAxisValue(MotionEvent.AXIS_HAT_Y) == 0.0f)
+                    setButtonState(hatYMap.getValue(controllerHatY).value(), ButtonState.Released.ordinal)
+                else
+                    setButtonState(hatYMap.getValue(event.getAxisValue(MotionEvent.AXIS_HAT_Y)).value(), ButtonState.Pressed.ordinal)
+
+                controllerHatY = event.getAxisValue(MotionEvent.AXIS_HAT_Y)
+
+                return true
+            }
+        }
+
+        if ((event.source and InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK && event.action == MotionEvent.ACTION_MOVE) {
+            val axisMap : Map<Int, NpadAxis> = mapOf(
+                    MotionEvent.AXIS_X to NpadAxis.LX,
+                    MotionEvent.AXIS_Y to NpadAxis.LY,
+                    MotionEvent.AXIS_Z to NpadAxis.RX,
+                    MotionEvent.AXIS_RZ to NpadAxis.RY)
+
+            //TODO: Digital inputs based off of analog sticks
+            event.device.motionRanges.forEach {
+                if (axisMap.containsKey(it.axis)) {
+                    var axisValue : Float = event.getAxisValue(it.axis)
+                    if (abs(axisValue) <= it.flat)
+                        axisValue = 0.0f
+
+                    val ratio : Float = axisValue / (it.max - it.min)
+                    val rangedAxisValue : Int = (ratio * (Short.MAX_VALUE - Short.MIN_VALUE)).toInt()
+
+                    setAxisValue(axisMap.getValue(it.axis).ordinal, rangedAxisValue)
+                }
+            }
+            return true
+        }
+
+        return super.dispatchGenericMotionEvent(event)
+    }
 }

app/src/main/java/emu/skyline/input/Button.kt

@@ -0,0 +1,21 @@
+/*
+ * SPDX-License-Identifier: MPL-2.0
+ * Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+ */
+
+package emu.skyline.input
+
+/**
+ * This is a generic interface for all Button classes to implement
+ */
+interface ButtonId {
+    /**
+     * This should return the value of the Button according to what libskyline expects
+     */
+    fun value() : Long
+}
+
+enum class ButtonState(val state : Boolean) {
+    Released(false),
+    Pressed(true),
+}

app/src/main/java/emu/skyline/input/Npad.kt

@@ -0,0 +1,57 @@
+/*
+ * SPDX-License-Identifier: MPL-2.0
+ * Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
+ */
+
+package emu.skyline.input
+
+/**
+ * This enumerates all buttons on an NPad controller
+ */
+enum class NpadButton : ButtonId {
+    A,
+    B,
+    X,
+    Y,
+    L3,
+    R3,
+    L,
+    R,
+    ZL,
+    ZR,
+    Plus,
+    Minus,
+    DpadLeft,
+    DpadUp,
+    DpadRight,
+    DpadDown,
+    LeftStickLeft,
+    LeftStickUp,
+    LeftStickRight,
+    LeftStickDown,
+    RightStickLeft,
+    RightStickUp,
+    RightStickRight,
+    RightStickDown,
+    LeftSL,
+    LeftSR,
+    RightSL,
+    RightSR;
+
+    /**
+     * This just returns the value as setting the [ordinal]-th bit in a [Long]
+     */
+    override fun value() : Long {
+        return (1.toLong()) shl ordinal
+    }
+}
+
+/**
+ * This enumerates all the axis on an NPad controller
+ */
+enum class NpadAxis {
+    RX,
+    RY,
+    LX,
+    LY,
+}