5 files changed, 183 insertions, 0 deletions

diff --git a/src/input_common/CMakeLists.txt b/src/input_common/CMakeLists.txt
index 7932aaab0..f24c89b04 100644
--- a/src/input_common/CMakeLists.txt
+++ b/src/input_common/CMakeLists.txt
@@ -20,6 +20,8 @@ add_library(input_common STATIC
     drivers/udp_client.h
     drivers/virtual_amiibo.cpp
     drivers/virtual_amiibo.h
+    drivers/virtual_gamepad.cpp
+    drivers/virtual_gamepad.h
     helpers/stick_from_buttons.cpp
     helpers/stick_from_buttons.h
     helpers/touch_from_buttons.cpp
diff --git a/src/input_common/drivers/virtual_gamepad.cpp b/src/input_common/drivers/virtual_gamepad.cpp
new file mode 100644
index 000000000..7db945aa6
--- /dev/null
+++ b/src/input_common/drivers/virtual_gamepad.cpp
@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "input_common/drivers/virtual_gamepad.h"
+
+namespace InputCommon {
+constexpr std::size_t PlayerIndexCount = 10;
+
+VirtualGamepad::VirtualGamepad(std::string input_engine_) : InputEngine(std::move(input_engine_)) {
+    for (std::size_t i = 0; i < PlayerIndexCount; i++) {
+        PreSetController(GetIdentifier(i));
+    }
+}
+
+void VirtualGamepad::SetButtonState(std::size_t player_index, int button_id, bool value) {
+    if (player_index > PlayerIndexCount) {
+        return;
+    }
+    const auto identifier = GetIdentifier(player_index);
+    SetButton(identifier, button_id, value);
+}
+
+void VirtualGamepad::SetButtonState(std::size_t player_index, VirtualButton button_id, bool value) {
+    SetButtonState(player_index, static_cast<int>(button_id), value);
+}
+
+void VirtualGamepad::SetStickPosition(std::size_t player_index, int axis_id, float x_value,
+                                      float y_value) {
+    if (player_index > PlayerIndexCount) {
+        return;
+    }
+    const auto identifier = GetIdentifier(player_index);
+    SetAxis(identifier, axis_id * 2, x_value);
+    SetAxis(identifier, (axis_id * 2) + 1, y_value);
+}
+
+void VirtualGamepad::SetStickPosition(std::size_t player_index, VirtualStick axis_id, float x_value,
+                                      float y_value) {
+    SetStickPosition(player_index, static_cast<int>(axis_id), x_value, y_value);
+}
+
+void VirtualGamepad::ResetControllers() {
+    for (std::size_t i = 0; i < PlayerIndexCount; i++) {
+        SetStickPosition(i, VirtualStick::Left, 0.0f, 0.0f);
+        SetStickPosition(i, VirtualStick::Right, 0.0f, 0.0f);
+
+        SetButtonState(i, VirtualButton::ButtonA, false);
+        SetButtonState(i, VirtualButton::ButtonB, false);
+        SetButtonState(i, VirtualButton::ButtonX, false);
+        SetButtonState(i, VirtualButton::ButtonY, false);
+        SetButtonState(i, VirtualButton::StickL, false);
+        SetButtonState(i, VirtualButton::StickR, false);
+        SetButtonState(i, VirtualButton::TriggerL, false);
+        SetButtonState(i, VirtualButton::TriggerR, false);
+        SetButtonState(i, VirtualButton::TriggerZL, false);
+        SetButtonState(i, VirtualButton::TriggerZR, false);
+        SetButtonState(i, VirtualButton::ButtonPlus, false);
+        SetButtonState(i, VirtualButton::ButtonMinus, false);
+        SetButtonState(i, VirtualButton::ButtonLeft, false);
+        SetButtonState(i, VirtualButton::ButtonUp, false);
+        SetButtonState(i, VirtualButton::ButtonRight, false);
+        SetButtonState(i, VirtualButton::ButtonDown, false);
+        SetButtonState(i, VirtualButton::ButtonSL, false);
+        SetButtonState(i, VirtualButton::ButtonSR, false);
+        SetButtonState(i, VirtualButton::ButtonHome, false);
+        SetButtonState(i, VirtualButton::ButtonCapture, false);
+    }
+}
+
+PadIdentifier VirtualGamepad::GetIdentifier(std::size_t player_index) const {
+    return {
+        .guid = Common::UUID{},
+        .port = player_index,
+        .pad = 0,
+    };
+}
+
+} // namespace InputCommon
diff --git a/src/input_common/drivers/virtual_gamepad.h b/src/input_common/drivers/virtual_gamepad.h
new file mode 100644
index 000000000..3df91cc6f
--- /dev/null
+++ b/src/input_common/drivers/virtual_gamepad.h
@@ -0,0 +1,73 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "input_common/input_engine.h"
+
+namespace InputCommon {
+
+/**
+ * A virtual controller that is always assigned to the game input
+ */
+class VirtualGamepad final : public InputEngine {
+public:
+    enum class VirtualButton {
+        ButtonA,
+        ButtonB,
+        ButtonX,
+        ButtonY,
+        StickL,
+        StickR,
+        TriggerL,
+        TriggerR,
+        TriggerZL,
+        TriggerZR,
+        ButtonPlus,
+        ButtonMinus,
+        ButtonLeft,
+        ButtonUp,
+        ButtonRight,
+        ButtonDown,
+        ButtonSL,
+        ButtonSR,
+        ButtonHome,
+        ButtonCapture,
+    };
+
+    enum class VirtualStick {
+        Left = 0,
+        Right = 1,
+    };
+
+    explicit VirtualGamepad(std::string input_engine_);
+
+    /**
+     * Sets the status of all buttons bound with the key to pressed
+     * @param player_index the player number that will take this action
+     * @param button_id the id of the button
+     * @param value indicates if the button is pressed or not
+     */
+    void SetButtonState(std::size_t player_index, int button_id, bool value);
+    void SetButtonState(std::size_t player_index, VirtualButton button_id, bool value);
+
+    /**
+     * Sets the status of all buttons bound with the key to released
+     * @param player_index the player number that will take this action
+     * @param axis_id the id of the axis to move
+     * @param x_value the position of the stick in the x axis
+     * @param y_value the position of the stick in the y axis
+     */
+    void SetStickPosition(std::size_t player_index, int axis_id, float x_value, float y_value);
+    void SetStickPosition(std::size_t player_index, VirtualStick axis_id, float x_value,
+                          float y_value);
+
+    /// Restores all inputs into the neutral position
+    void ResetControllers();
+
+private:
+    /// Returns the correct identifier corresponding to the player index
+    PadIdentifier GetIdentifier(std::size_t player_index) const;
+};
+
+} // namespace InputCommon
diff --git a/src/input_common/main.cpp b/src/input_common/main.cpp
index 942a13535..75b856c95 100644
--- a/src/input_common/main.cpp
+++ b/src/input_common/main.cpp
@@ -12,6 +12,7 @@
 #include "input_common/drivers/touch_screen.h"
 #include "input_common/drivers/udp_client.h"
 #include "input_common/drivers/virtual_amiibo.h"
+#include "input_common/drivers/virtual_gamepad.h"
 #include "input_common/helpers/stick_from_buttons.h"
 #include "input_common/helpers/touch_from_buttons.h"
 #include "input_common/input_engine.h"
@@ -85,6 +86,12 @@ struct InputSubsystem::Impl {
         Common::Input::RegisterOutputFactory(virtual_amiibo->GetEngineName(),
                                              virtual_amiibo_output_factory);
 
+        virtual_gamepad = std::make_shared<VirtualGamepad>("virtual_gamepad");
+        virtual_gamepad->SetMappingCallback(mapping_callback);
+        virtual_gamepad_input_factory = std::make_shared<InputFactory>(virtual_gamepad);
+        Common::Input::RegisterInputFactory(virtual_gamepad->GetEngineName(),
+                                            virtual_gamepad_input_factory);
+
 #ifdef HAVE_SDL2
         sdl = std::make_shared<SDLDriver>("sdl");
         sdl->SetMappingCallback(mapping_callback);
@@ -132,6 +139,9 @@ struct InputSubsystem::Impl {
         Common::Input::UnregisterOutputFactory(virtual_amiibo->GetEngineName());
         virtual_amiibo.reset();
 
+        Common::Input::UnregisterInputFactory(virtual_gamepad->GetEngineName());
+        virtual_gamepad.reset();
+
 #ifdef HAVE_SDL2
         Common::Input::UnregisterInputFactory(sdl->GetEngineName());
         Common::Input::UnregisterOutputFactory(sdl->GetEngineName());
@@ -290,6 +300,9 @@ struct InputSubsystem::Impl {
         if (engine == tas_input->GetEngineName()) {
             return true;
         }
+        if (engine == virtual_gamepad->GetEngineName()) {
+            return true;
+        }
 #ifdef HAVE_SDL2
         if (engine == sdl->GetEngineName()) {
             return true;
@@ -338,6 +351,7 @@ struct InputSubsystem::Impl {
     std::shared_ptr<CemuhookUDP::UDPClient> udp_client;
     std::shared_ptr<Camera> camera;
     std::shared_ptr<VirtualAmiibo> virtual_amiibo;
+    std::shared_ptr<VirtualGamepad> virtual_gamepad;
 
     std::shared_ptr<InputFactory> keyboard_factory;
     std::shared_ptr<InputFactory> mouse_factory;
@@ -347,6 +361,7 @@ struct InputSubsystem::Impl {
     std::shared_ptr<InputFactory> tas_input_factory;
     std::shared_ptr<InputFactory> camera_input_factory;
     std::shared_ptr<InputFactory> virtual_amiibo_input_factory;
+    std::shared_ptr<InputFactory> virtual_gamepad_input_factory;
 
     std::shared_ptr<OutputFactory> keyboard_output_factory;
     std::shared_ptr<OutputFactory> mouse_output_factory;
@@ -423,6 +438,14 @@ const VirtualAmiibo* InputSubsystem::GetVirtualAmiibo() const {
     return impl->virtual_amiibo.get();
 }
 
+VirtualGamepad* InputSubsystem::GetVirtualGamepad() {
+    return impl->virtual_gamepad.get();
+}
+
+const VirtualGamepad* InputSubsystem::GetVirtualGamepad() const {
+    return impl->virtual_gamepad.get();
+}
+
 std::vector<Common::ParamPackage> InputSubsystem::GetInputDevices() const {
     return impl->GetInputDevices();
 }
diff --git a/src/input_common/main.h b/src/input_common/main.h
index 6218c37f6..1207d786c 100644
--- a/src/input_common/main.h
+++ b/src/input_common/main.h
@@ -34,6 +34,7 @@ class Keyboard;
 class Mouse;
 class TouchScreen;
 class VirtualAmiibo;
+class VirtualGamepad;
 struct MappingData;
 } // namespace InputCommon
 
@@ -108,6 +109,12 @@ public:
     /// Retrieves the underlying virtual amiibo input device.
     [[nodiscard]] const VirtualAmiibo* GetVirtualAmiibo() const;
 
+    /// Retrieves the underlying virtual gamepad input device.
+    [[nodiscard]] VirtualGamepad* GetVirtualGamepad();
+
+    /// Retrieves the underlying virtual gamepad input device.
+    [[nodiscard]] const VirtualGamepad* GetVirtualGamepad() const;
+
     /**
      * Returns all available input devices that this Factory can create a new device with.
      * Each returned ParamPackage should have a `display` field used for display, a `engine` field