Merge pull request #5163 from z87/input-touch-mapping

input: allow mapping buttons to touchscreen

dist/qt_themes/qdarkstyle/style.qss

@@ -673,10 +673,6 @@ QTabWidget::pane {
     border-bottom-left-radius: 2px;
 }
 
-QTabWidget::tab-bar {
-    overflow: visible;
-}
-
 QTabBar {
     qproperty-drawBase: 0;
     border-radius: 3px;
@@ -1236,3 +1232,8 @@ QToolButton:disabled,
 QPlainTextEdit:disabled {
     background-color: #2b2e31;
 }
+
+/* touchscreen mapping widget */
+TouchScreenPreview {
+    qproperty-dotHighlightColor: #3daee9;
+}

src/citra_qt/CMakeLists.txt

@@ -69,6 +69,10 @@ add_executable(citra-qt
     configuration/configure_system.cpp
     configuration/configure_system.h
     configuration/configure_system.ui
+    configuration/configure_touch_from_button.cpp
+    configuration/configure_touch_from_button.h
+    configuration/configure_touch_from_button.ui
+    configuration/configure_touch_widget.h
     configuration/configure_ui.cpp
     configuration/configure_ui.h
     configuration/configure_ui.ui

src/citra_qt/configuration/config.cpp

@@ -164,10 +164,42 @@ void Config::ReadCameraValues() {
 void Config::ReadControlValues() {
     qt_config->beginGroup(QStringLiteral("Controls"));
 
+    int num_touch_from_button_maps =
+        qt_config->beginReadArray(QStringLiteral("touch_from_button_maps"));
+
+    if (num_touch_from_button_maps > 0) {
+        const auto append_touch_from_button_map = [this] {
+            Settings::TouchFromButtonMap map;
+            map.name = ReadSetting(QStringLiteral("name"), QStringLiteral("default"))
+                           .toString()
+                           .toStdString();
+            const int num_touch_maps = qt_config->beginReadArray(QStringLiteral("entries"));
+            map.buttons.reserve(num_touch_maps);
+            for (int i = 0; i < num_touch_maps; i++) {
+                qt_config->setArrayIndex(i);
+                std::string touch_mapping =
+                    ReadSetting(QStringLiteral("bind")).toString().toStdString();
+                map.buttons.emplace_back(std::move(touch_mapping));
+            }
+            qt_config->endArray(); // entries
+            Settings::values.touch_from_button_maps.emplace_back(std::move(map));
+        };
+
+        for (int i = 0; i < num_touch_from_button_maps; ++i) {
+            qt_config->setArrayIndex(i);
+            append_touch_from_button_map();
+        }
+    } else {
+        Settings::values.touch_from_button_maps.emplace_back(
+            Settings::TouchFromButtonMap{"default", {}});
+        num_touch_from_button_maps = 1;
+    }
+    qt_config->endArray();
+
     Settings::values.current_input_profile_index =
         ReadSetting(QStringLiteral("profile"), 0).toInt();
 
-    const auto append_profile = [this] {
+    const auto append_profile = [this, num_touch_from_button_maps] {
         Settings::InputProfile profile;
         profile.name =
             ReadSetting(QStringLiteral("name"), QStringLiteral("default")).toString().toStdString();
@@ -201,6 +233,12 @@ void Config::ReadControlValues() {
             ReadSetting(QStringLiteral("touch_device"), QStringLiteral("engine:emu_window"))
                 .toString()
                 .toStdString();
+        profile.use_touch_from_button =
+            ReadSetting(QStringLiteral("use_touch_from_button"), false).toBool();
+        profile.touch_from_button_map_index =
+            ReadSetting(QStringLiteral("touch_from_button_map"), 0).toInt();
+        profile.touch_from_button_map_index =
+            std::clamp(profile.touch_from_button_map_index, 0, num_touch_from_button_maps - 1);
         profile.udp_input_address =
             ReadSetting(QStringLiteral("udp_input_address"),
                         QString::fromUtf8(InputCommon::CemuhookUDP::DEFAULT_ADDR))
@@ -758,6 +796,9 @@ void Config::SaveControlValues() {
             QStringLiteral("engine:motion_emu,update_period:100,sensitivity:0.01,tilt_clamp:90.0"));
         WriteSetting(QStringLiteral("touch_device"), QString::fromStdString(profile.touch_device),
                      QStringLiteral("engine:emu_window"));
+        WriteSetting(QStringLiteral("use_touch_from_button"), profile.use_touch_from_button, false);
+        WriteSetting(QStringLiteral("touch_from_button_map"), profile.touch_from_button_map_index,
+                     0);
         WriteSetting(QStringLiteral("udp_input_address"),
                      QString::fromStdString(profile.udp_input_address),
                      QString::fromUtf8(InputCommon::CemuhookUDP::DEFAULT_ADDR));
@@ -767,6 +808,21 @@ void Config::SaveControlValues() {
     }
     qt_config->endArray();
 
+    qt_config->beginWriteArray(QStringLiteral("touch_from_button_maps"));
+    for (std::size_t p = 0; p < Settings::values.touch_from_button_maps.size(); ++p) {
+        qt_config->setArrayIndex(static_cast<int>(p));
+        const auto& map = Settings::values.touch_from_button_maps[p];
+        WriteSetting(QStringLiteral("name"), QString::fromStdString(map.name),
+                     QStringLiteral("default"));
+        qt_config->beginWriteArray(QStringLiteral("entries"));
+        for (std::size_t q = 0; q < map.buttons.size(); ++q) {
+            qt_config->setArrayIndex(static_cast<int>(q));
+            WriteSetting(QStringLiteral("bind"), QString::fromStdString(map.buttons[q]));
+        }
+        qt_config->endArray();
+    }
+    qt_config->endArray();
+
     qt_config->endGroup();
 }
 

src/citra_qt/configuration/configure_motion_touch.cpp

@@ -9,7 +9,7 @@
 #include <QPushButton>
 #include <QVBoxLayout>
 #include "citra_qt/configuration/configure_motion_touch.h"
-#include "core/settings.h"
+#include "citra_qt/configuration/configure_touch_from_button.h"
 #include "input_common/main.h"
 #include "ui_configure_motion_touch.h"
 
@@ -111,6 +111,14 @@ void ConfigureMotionTouch::SetConfiguration() {
         ui->motion_provider->findData(QString::fromStdString(motion_engine)));
     ui->touch_provider->setCurrentIndex(
         ui->touch_provider->findData(QString::fromStdString(touch_engine)));
+    ui->touch_from_button_checkbox->setChecked(
+        Settings::values.current_input_profile.use_touch_from_button);
+    touch_from_button_maps = Settings::values.touch_from_button_maps;
+    for (const auto& touch_map : touch_from_button_maps) {
+        ui->touch_from_button_map->addItem(QString::fromStdString(touch_map.name));
+    }
+    ui->touch_from_button_map->setCurrentIndex(
+        Settings::values.current_input_profile.touch_from_button_map_index);
     ui->motion_sensitivity->setValue(motion_param.Get("sensitivity", 0.01f));
 
     min_x = touch_param.Get("min_x", 100);
@@ -166,6 +174,8 @@ void ConfigureMotionTouch::ConnectEvents() {
     connect(ui->udp_test, &QPushButton::clicked, this, &ConfigureMotionTouch::OnCemuhookUDPTest);
     connect(ui->touch_calibration_config, &QPushButton::clicked, this,
             &ConfigureMotionTouch::OnConfigureTouchCalibration);
+    connect(ui->touch_from_button_config_btn, &QPushButton::clicked, this,
+            &ConfigureMotionTouch::OnConfigureTouchFromButton);
     connect(ui->buttonBox, &QDialogButtonBox::rejected, this, [this] {
         if (CanCloseDialog())
             reject();
@@ -234,6 +244,23 @@ void ConfigureMotionTouch::ShowUDPTestResult(bool result) {
     ui->udp_test->setText(tr("Test"));
 }
 
+void ConfigureMotionTouch::OnConfigureTouchFromButton() {
+    ConfigureTouchFromButton dialog{this, touch_from_button_maps,
+                                    ui->touch_from_button_map->currentIndex()};
+    if (dialog.exec() != QDialog::Accepted) {
+        return;
+    }
+    touch_from_button_maps = dialog.GetMaps();
+
+    while (ui->touch_from_button_map->count() > 0) {
+        ui->touch_from_button_map->removeItem(0);
+    }
+    for (const auto& touch_map : touch_from_button_maps) {
+        ui->touch_from_button_map->addItem(QString::fromStdString(touch_map.name));
+    }
+    ui->touch_from_button_map->setCurrentIndex(dialog.GetSelectedIndex());
+}
+
 bool ConfigureMotionTouch::CanCloseDialog() {
     if (udp_test_in_progress) {
         QMessageBox::warning(this, tr("Citra"),
@@ -268,6 +295,11 @@ void ConfigureMotionTouch::ApplyConfiguration() {
 
     Settings::values.current_input_profile.motion_device = motion_param.Serialize();
     Settings::values.current_input_profile.touch_device = touch_param.Serialize();
+    Settings::values.current_input_profile.use_touch_from_button =
+        ui->touch_from_button_checkbox->isChecked();
+    Settings::values.current_input_profile.touch_from_button_map_index =
+        ui->touch_from_button_map->currentIndex();
+    Settings::values.touch_from_button_maps = touch_from_button_maps;
     Settings::values.current_input_profile.udp_input_address = ui->udp_server->text().toStdString();
     Settings::values.current_input_profile.udp_input_port =
         static_cast<u16>(ui->udp_port->text().toInt());

src/citra_qt/configuration/configure_motion_touch.h

@@ -7,6 +7,7 @@
 #include <memory>
 #include <QDialog>
 #include "common/param_package.h"
+#include "core/settings.h"
 #include "input_common/udp/udp.h"
 
 class QVBoxLayout;
@@ -54,6 +55,7 @@ public slots:
 private slots:
     void OnCemuhookUDPTest();
     void OnConfigureTouchCalibration();
+    void OnConfigureTouchFromButton();
 
 private:
     void closeEvent(QCloseEvent* event) override;
@@ -69,4 +71,6 @@ private:
     int min_x, min_y, max_x, max_y;
 
     bool udp_test_in_progress{};
+
+    std::vector<Settings::TouchFromButtonMap> touch_from_button_maps;
 };

src/citra_qt/configuration/configure_motion_touch.ui

@@ -124,6 +124,39 @@
         </item>
        </layout>
       </item>
+      <item>
+       <layout class="QHBoxLayout">
+        <item>
+         <widget class="QCheckBox" name="touch_from_button_checkbox">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string>Use button mapping:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QComboBox" name="touch_from_button_map"/>
+        </item>
+        <item>
+         <widget class="QPushButton" name="touch_from_button_config_btn">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string>Configure</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
      </layout>
     </widget>
    </item>

src/citra_qt/configuration/configure_touch_from_button.cpp

@@ -0,0 +1,610 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <QInputDialog>
+#include <QKeyEvent>
+#include <QMessageBox>
+#include <QMouseEvent>
+#include <QResizeEvent>
+#include <QStandardItemModel>
+#include <QTimer>
+#include "citra_qt/configuration/configure_touch_from_button.h"
+#include "citra_qt/configuration/configure_touch_widget.h"
+#include "common/param_package.h"
+#include "core/3ds.h"
+#include "input_common/main.h"
+#include "ui_configure_touch_from_button.h"
+
+static QString GetKeyName(int key_code) {
+    switch (key_code) {
+    case Qt::Key_Shift:
+        return QObject::tr("Shift");
+    case Qt::Key_Control:
+        return QObject::tr("Ctrl");
+    case Qt::Key_Alt:
+        return QObject::tr("Alt");
+    case Qt::Key_Meta:
+        return QString{};
+    default:
+        return QKeySequence(key_code).toString();
+    }
+}
+
+static QString ButtonToText(const Common::ParamPackage& param) {
+    if (!param.Has("engine")) {
+        return QObject::tr("[not set]");
+    }
+
+    if (param.Get("engine", "") == "keyboard") {
+        return GetKeyName(param.Get("code", 0));
+    }
+
+    if (param.Get("engine", "") == "sdl") {
+        if (param.Has("hat")) {
+            const QString hat_str = QString::fromStdString(param.Get("hat", ""));
+            const QString direction_str = QString::fromStdString(param.Get("direction", ""));
+
+            return QObject::tr("Hat %1 %2").arg(hat_str, direction_str);
+        }
+
+        if (param.Has("axis")) {
+            const QString axis_str = QString::fromStdString(param.Get("axis", ""));
+            const QString direction_str = QString::fromStdString(param.Get("direction", ""));
+
+            return QObject::tr("Axis %1%2").arg(axis_str, direction_str);
+        }
+
+        if (param.Has("button")) {
+            const QString button_str = QString::fromStdString(param.Get("button", ""));
+
+            return QObject::tr("Button %1").arg(button_str);
+        }
+
+        return {};
+    }
+
+    return QObject::tr("[unknown]");
+}
+
+ConfigureTouchFromButton::ConfigureTouchFromButton(
+    QWidget* parent, const std::vector<Settings::TouchFromButtonMap>& touch_maps,
+    const int default_index)
+    : QDialog(parent), ui(std::make_unique<Ui::ConfigureTouchFromButton>()), touch_maps(touch_maps),
+      selected_index(default_index), timeout_timer(std::make_unique<QTimer>()),
+      poll_timer(std::make_unique<QTimer>()) {
+
+    ui->setupUi(this);
+    binding_list_model = std::make_unique<QStandardItemModel>(0, 3, this);
+    binding_list_model->setHorizontalHeaderLabels({tr("Button"), tr("X"), tr("Y")});
+    ui->binding_list->setModel(binding_list_model.get());
+    ui->bottom_screen->SetCoordLabel(ui->coord_label);
+
+    SetConfiguration();
+    UpdateUiDisplay();
+    ConnectEvents();
+}
+
+ConfigureTouchFromButton::~ConfigureTouchFromButton() = default;
+
+void ConfigureTouchFromButton::showEvent(QShowEvent* ev) {
+    QWidget::showEvent(ev);
+
+    // width values are not valid in the constructor
+    const int w =
+        ui->binding_list->viewport()->contentsRect().width() / binding_list_model->columnCount();
+    if (w > 0) {
+        ui->binding_list->setColumnWidth(0, w);
+        ui->binding_list->setColumnWidth(1, w);
+        ui->binding_list->setColumnWidth(2, w);
+    }
+}
+
+void ConfigureTouchFromButton::SetConfiguration() {
+    for (const auto& touch_map : touch_maps) {
+        ui->mapping->addItem(QString::fromStdString(touch_map.name));
+    }
+
+    ui->mapping->setCurrentIndex(selected_index);
+}
+
+void ConfigureTouchFromButton::UpdateUiDisplay() {
+    ui->button_delete->setEnabled(touch_maps.size() > 1);
+    ui->button_delete_bind->setEnabled(false);
+
+    binding_list_model->removeRows(0, binding_list_model->rowCount());
+
+    for (const auto& button_str : touch_maps[selected_index].buttons) {
+        Common::ParamPackage package{button_str};
+        QStandardItem* button = new QStandardItem(ButtonToText(package));
+        button->setData(QString::fromStdString(button_str));
+        button->setEditable(false);
+        QStandardItem* xcoord = new QStandardItem(QString::number(package.Get("x", 0)));
+        QStandardItem* ycoord = new QStandardItem(QString::number(package.Get("y", 0)));
+        binding_list_model->appendRow({button, xcoord, ycoord});
+
+        int dot = ui->bottom_screen->AddDot(package.Get("x", 0), package.Get("y", 0));
+        button->setData(dot, DataRoleDot);
+    }
+}
+
+void ConfigureTouchFromButton::ConnectEvents() {
+    connect(ui->mapping, qOverload<int>(&QComboBox::currentIndexChanged), this, [this](int index) {
+        SaveCurrentMapping();
+        selected_index = index;
+        UpdateUiDisplay();
+    });
+    connect(ui->button_new, &QPushButton::clicked, this, &ConfigureTouchFromButton::NewMapping);
+    connect(ui->button_delete, &QPushButton::clicked, this,
+            &ConfigureTouchFromButton::DeleteMapping);
+    connect(ui->button_rename, &QPushButton::clicked, this,
+            &ConfigureTouchFromButton::RenameMapping);
+    connect(ui->button_delete_bind, &QPushButton::clicked, this,
+            &ConfigureTouchFromButton::DeleteBinding);
+    connect(ui->binding_list, &QTreeView::doubleClicked, this,
+            &ConfigureTouchFromButton::EditBinding);
+    connect(ui->binding_list->selectionModel(), &QItemSelectionModel::selectionChanged, this,
+            &ConfigureTouchFromButton::OnBindingSelection);
+    connect(binding_list_model.get(), &QStandardItemModel::itemChanged, this,
+            &ConfigureTouchFromButton::OnBindingChanged);
+    connect(ui->binding_list->model(), &QStandardItemModel::rowsAboutToBeRemoved, this,
+            &ConfigureTouchFromButton::OnBindingDeleted);
+    connect(ui->bottom_screen, &TouchScreenPreview::DotAdded, this,
+            &ConfigureTouchFromButton::NewBinding);
+    connect(ui->bottom_screen, &TouchScreenPreview::DotSelected, this,
+            &ConfigureTouchFromButton::SetActiveBinding);
+    connect(ui->bottom_screen, &TouchScreenPreview::DotMoved, this,
+            &ConfigureTouchFromButton::SetCoordinates);
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this,
+            &ConfigureTouchFromButton::ApplyConfiguration);
+
+    connect(timeout_timer.get(), &QTimer::timeout, [this]() { SetPollingResult({}, true); });
+
+    connect(poll_timer.get(), &QTimer::timeout, [this]() {
+        Common::ParamPackage params;
+        for (auto& poller : device_pollers) {
+            params = poller->GetNextInput();
+            if (params.Has("engine")) {
+                SetPollingResult(params, false);
+                return;
+            }
+        }
+    });
+}
+
+void ConfigureTouchFromButton::SaveCurrentMapping() {
+    auto& map = touch_maps[selected_index];
+    map.buttons.clear();
+    for (int i = 0, rc = binding_list_model->rowCount(); i < rc; ++i) {
+        const auto bind_str = binding_list_model->index(i, 0)
+                                  .data(Qt::ItemDataRole::UserRole + 1)
+                                  .toString()
+                                  .toStdString();
+        if (bind_str.empty()) {
+            continue;
+        }
+        Common::ParamPackage params{bind_str};
+        if (!params.Has("engine")) {
+            continue;
+        }
+        params.Set("x", binding_list_model->index(i, 1).data().toInt());
+        params.Set("y", binding_list_model->index(i, 2).data().toInt());
+        map.buttons.emplace_back(params.Serialize());
+    }
+}
+
+void ConfigureTouchFromButton::NewMapping() {
+    const QString name =
+        QInputDialog::getText(this, tr("New Profile"), tr("Enter the name for the new profile."));
+    if (name.isEmpty()) {
+        return;
+    }
+    touch_maps.emplace_back(Settings::TouchFromButtonMap{name.toStdString(), {}});
+    ui->mapping->addItem(name);
+    ui->mapping->setCurrentIndex(ui->mapping->count() - 1);
+}
+
+void ConfigureTouchFromButton::DeleteMapping() {
+    const auto answer = QMessageBox::question(
+        this, tr("Delete Profile"), tr("Delete profile %1?").arg(ui->mapping->currentText()));
+    if (answer != QMessageBox::Yes) {
+        return;
+    }
+    const bool blocked = ui->mapping->blockSignals(true);
+    ui->mapping->removeItem(selected_index);
+    ui->mapping->blockSignals(blocked);
+    touch_maps.erase(touch_maps.begin() + selected_index);
+    selected_index = ui->mapping->currentIndex();
+    UpdateUiDisplay();
+}
+
+void ConfigureTouchFromButton::RenameMapping() {
+    const QString new_name = QInputDialog::getText(this, tr("Rename Profile"), tr("New name:"));
+    if (new_name.isEmpty()) {
+        return;
+    }
+    ui->mapping->setItemText(selected_index, new_name);
+    touch_maps[selected_index].name = new_name.toStdString();
+}
+
+void ConfigureTouchFromButton::GetButtonInput(const int row_index, const bool is_new) {
+    binding_list_model->item(row_index, 0)->setText(tr("[press key]"));
+
+    input_setter = [this, row_index, is_new](const Common::ParamPackage& params,
+                                             const bool cancel) {
+        auto cell = binding_list_model->item(row_index, 0);
+        if (cancel) {
+            if (is_new) {
+                binding_list_model->removeRow(row_index);
+            } else {
+                cell->setText(
+                    ButtonToText(Common::ParamPackage{cell->data().toString().toStdString()}));
+            }
+        } else {
+            cell->setText(ButtonToText(params));
+            cell->setData(QString::fromStdString(params.Serialize()));
+        }
+    };
+
+    device_pollers = InputCommon::Polling::GetPollers(InputCommon::Polling::DeviceType::Button);
+
+    for (auto& poller : device_pollers) {
+        poller->Start();
+    }
+
+    grabKeyboard();
+    grabMouse();
+    qApp->setOverrideCursor(QCursor(Qt::CursorShape::ArrowCursor));
+    timeout_timer->start(5000); // Cancel after 5 seconds
+    poll_timer->start(200);     // Check for new inputs every 200ms
+}
+
+void ConfigureTouchFromButton::NewBinding(const QPoint& pos) {
+    QStandardItem* button = new QStandardItem();
+    button->setEditable(false);
+    QStandardItem* xcoord = new QStandardItem(QString::number(pos.x()));
+    QStandardItem* ycoord = new QStandardItem(QString::number(pos.y()));
+
+    const int dot_id = ui->bottom_screen->AddDot(pos.x(), pos.y());
+    button->setData(dot_id, DataRoleDot);
+
+    binding_list_model->appendRow({button, xcoord, ycoord});
+    ui->binding_list->setFocus();
+    ui->binding_list->setCurrentIndex(button->index());
+
+    GetButtonInput(binding_list_model->rowCount() - 1, true);
+}
+
+void ConfigureTouchFromButton::EditBinding(const QModelIndex& qi) {
+    if (qi.row() >= 0 && qi.column() == 0) {
+        GetButtonInput(qi.row(), false);
+    }
+}
+
+void ConfigureTouchFromButton::DeleteBinding() {
+    const int row_index = ui->binding_list->currentIndex().row();
+    if (row_index >= 0) {
+        ui->bottom_screen->RemoveDot(
+            binding_list_model->index(row_index, 0).data(DataRoleDot).toInt());
+        binding_list_model->removeRow(row_index);
+    }
+}
+
+void ConfigureTouchFromButton::OnBindingSelection(const QItemSelection& selected,
+                                                  const QItemSelection& deselected) {
+    ui->button_delete_bind->setEnabled(!selected.isEmpty());
+    if (!selected.isEmpty()) {
+        const auto dot_data = selected.indexes().first().data(DataRoleDot);
+        if (dot_data.isValid()) {
+            ui->bottom_screen->HighlightDot(dot_data.toInt());
+        }
+    }
+    if (!deselected.isEmpty()) {
+        const auto dot_data = deselected.indexes().first().data(DataRoleDot);
+        if (dot_data.isValid()) {
+            ui->bottom_screen->HighlightDot(dot_data.toInt(), false);
+        }
+    }
+}
+
+void ConfigureTouchFromButton::OnBindingChanged(QStandardItem* item) {
+    if (item->column() == 0) {
+        return;
+    }
+
+    const bool blocked = binding_list_model->blockSignals(true);
+    item->setText(QString::number(std::clamp(
+        item->text().toInt(), 0,
+        (item->column() == 1 ? Core::kScreenBottomWidth : Core::kScreenBottomHeight) - 1)));
+    binding_list_model->blockSignals(blocked);
+
+    const auto dot_data = binding_list_model->index(item->row(), 0).data(DataRoleDot);
+    if (dot_data.isValid()) {
+        ui->bottom_screen->MoveDot(dot_data.toInt(),
+                                   binding_list_model->item(item->row(), 1)->text().toInt(),
+                                   binding_list_model->item(item->row(), 2)->text().toInt());
+    }
+}
+
+void ConfigureTouchFromButton::OnBindingDeleted(const QModelIndex& parent, int first, int last) {
+    for (int i = first; i <= last; ++i) {
+        auto ix = binding_list_model->index(i, 0);
+        if (!ix.isValid()) {
+            return;
+        }
+        const auto dot_data = ix.data(DataRoleDot);
+        if (dot_data.isValid()) {
+            ui->bottom_screen->RemoveDot(dot_data.toInt());
+        }
+    }
+}
+
+void ConfigureTouchFromButton::SetActiveBinding(const int dot_id) {
+    for (int i = 0; i < binding_list_model->rowCount(); ++i) {
+        if (binding_list_model->index(i, 0).data(DataRoleDot) == dot_id) {
+            ui->binding_list->setCurrentIndex(binding_list_model->index(i, 0));
+            ui->binding_list->setFocus();
+            return;
+        }
+    }
+}
+
+void ConfigureTouchFromButton::SetCoordinates(const int dot_id, const QPoint& pos) {
+    for (int i = 0; i < binding_list_model->rowCount(); ++i) {
+        if (binding_list_model->item(i, 0)->data(DataRoleDot) == dot_id) {
+            binding_list_model->item(i, 1)->setText(QString::number(pos.x()));
+            binding_list_model->item(i, 2)->setText(QString::number(pos.y()));
+            return;
+        }
+    }
+}
+
+void ConfigureTouchFromButton::SetPollingResult(const Common::ParamPackage& params,
+                                                const bool cancel) {
+    releaseKeyboard();
+    releaseMouse();
+    qApp->restoreOverrideCursor();
+    timeout_timer->stop();
+    poll_timer->stop();
+    for (auto& poller : device_pollers) {
+        poller->Stop();
+    }
+    if (input_setter) {
+        (*input_setter)(params, cancel);
+        input_setter.reset();
+    }
+}
+
+void ConfigureTouchFromButton::keyPressEvent(QKeyEvent* event) {
+    if (!input_setter && event->key() == Qt::Key_Delete) {
+        DeleteBinding();
+        return;
+    }
+
+    if (!input_setter) {
+        return QDialog::keyPressEvent(event);
+    }
+
+    if (event->key() != Qt::Key_Escape) {
+        SetPollingResult(Common::ParamPackage{InputCommon::GenerateKeyboardParam(event->key())},
+                         false);
+    } else {
+        SetPollingResult({}, true);
+    }
+}
+
+void ConfigureTouchFromButton::ApplyConfiguration() {
+    SaveCurrentMapping();
+    accept();
+}
+
+int ConfigureTouchFromButton::GetSelectedIndex() const {
+    return selected_index;
+}
+
+std::vector<Settings::TouchFromButtonMap> ConfigureTouchFromButton::GetMaps() const {
+    return touch_maps;
+}
+
+TouchScreenPreview::TouchScreenPreview(QWidget* parent) : QFrame(parent) {
+    setBackgroundRole(QPalette::ColorRole::Base);
+}
+
+TouchScreenPreview::~TouchScreenPreview() = default;
+
+void TouchScreenPreview::SetCoordLabel(QLabel* const label) {
+    coord_label = label;
+}
+
+int TouchScreenPreview::AddDot(const int device_x, const int device_y) {
+    QFont dot_font{QStringLiteral("monospace")};
+    dot_font.setStyleHint(QFont::Monospace);
+    dot_font.setPointSize(20);
+
+    QLabel* dot = new QLabel(this);
+    dot->setAttribute(Qt::WA_TranslucentBackground);
+    dot->setFont(dot_font);
+    dot->setText(QChar(0xD7)); // U+00D7 Multiplication Sign
+    dot->setAlignment(Qt::AlignmentFlag::AlignCenter);
+    dot->setProperty(PropId, ++max_dot_id);
+    dot->setProperty(PropX, device_x);
+    dot->setProperty(PropY, device_y);
+    dot->setCursor(Qt::CursorShape::PointingHandCursor);
+    dot->setMouseTracking(true);
+    dot->installEventFilter(this);
+    dot->show();
+    PositionDot(dot, device_x, device_y);
+    dots.emplace_back(max_dot_id, dot);
+    return max_dot_id;
+}
+
+void TouchScreenPreview::RemoveDot(const int id) {
+    for (auto dot_it = dots.begin(); dot_it != dots.end(); ++dot_it) {
+        if (dot_it->first == id) {
+            dot_it->second->deleteLater();
+            dots.erase(dot_it);
+            return;
+        }
+    }
+}
+
+void TouchScreenPreview::HighlightDot(const int id, const bool active) const {
+    for (const auto& dot : dots) {
+        if (dot.first == id) {
+            // use color property from the stylesheet, or fall back to the default palette
+            if (dot_highlight_color.isValid()) {
+                dot.second->setStyleSheet(
+                    active ? QStringLiteral("color: %1").arg(dot_highlight_color.name())
+                           : QString{});
+            } else {
+                dot.second->setForegroundRole(active ? QPalette::ColorRole::LinkVisited
+                                                     : QPalette::ColorRole::NoRole);
+            }
+            if (active) {
+                dot.second->raise();
+            }
+            return;
+        }
+    }
+}
+
+void TouchScreenPreview::MoveDot(const int id, const int device_x, const int device_y) const {
+    for (const auto& dot : dots) {
+        if (dot.first == id) {
+            dot.second->setProperty(PropX, device_x);
+            dot.second->setProperty(PropY, device_y);
+            PositionDot(dot.second, device_x, device_y);
+            return;
+        }
+    }
+}
+
+void TouchScreenPreview::resizeEvent(QResizeEvent* event) {
+    if (ignore_resize) {
+        return;
+    }
+
+    const int target_width = std::min(width(), height() * 4 / 3);
+    const int target_height = std::min(height(), width() * 3 / 4);
+    if (target_width == width() && target_height == height()) {
+        return;
+    }
+    ignore_resize = true;
+    setGeometry((parentWidget()->contentsRect().width() - target_width) / 2, y(), target_width,
+                target_height);
+    ignore_resize = false;
+
+    if (event->oldSize().width() != target_width || event->oldSize().height() != target_height) {
+        for (const auto& dot : dots) {
+            PositionDot(dot.second);
+        }
+    }
+}
+
+void TouchScreenPreview::mouseMoveEvent(QMouseEvent* event) {
+    if (!coord_label) {
+        return;
+    }
+    const auto pos = MapToDeviceCoords(event->x(), event->y());
+    if (pos) {
+        coord_label->setText(QStringLiteral("X: %1, Y: %2").arg(pos->x()).arg(pos->y()));
+    } else {
+        coord_label->clear();
+    }
+}
+
+void TouchScreenPreview::leaveEvent(QEvent* event) {
+    if (coord_label) {
+        coord_label->clear();
+    }
+}
+
+void TouchScreenPreview::mousePressEvent(QMouseEvent* event) {
+    if (event->button() == Qt::MouseButton::LeftButton) {
+        const auto pos = MapToDeviceCoords(event->x(), event->y());
+        if (pos) {
+            emit DotAdded(*pos);
+        }
+    }
+}
+
+bool TouchScreenPreview::eventFilter(QObject* obj, QEvent* event) {
+    switch (event->type()) {
+    case QEvent::Type::MouseButtonPress: {
+        const auto mouse_event = static_cast<QMouseEvent*>(event);
+        if (mouse_event->button() != Qt::MouseButton::LeftButton) {
+            break;
+        }
+        emit DotSelected(obj->property(PropId).toInt());
+
+        drag_state.dot = qobject_cast<QLabel*>(obj);
+        drag_state.start_pos = mouse_event->globalPos();
+        return true;
+    }
+    case QEvent::Type::MouseMove: {
+        if (!drag_state.dot) {
+            break;
+        }
+        const auto mouse_event = static_cast<QMouseEvent*>(event);
+        if (!drag_state.active) {
+            drag_state.active =
+                (mouse_event->globalPos() - drag_state.start_pos).manhattanLength() >=
+                QApplication::startDragDistance();
+            if (!drag_state.active) {
+                break;
+            }
+        }
+        auto current_pos = mapFromGlobal(mouse_event->globalPos());
+        current_pos.setX(std::clamp(current_pos.x(), contentsMargins().left(),
+                                    contentsMargins().left() + contentsRect().width() - 1));
+        current_pos.setY(std::clamp(current_pos.y(), contentsMargins().top(),
+                                    contentsMargins().top() + contentsRect().height() - 1));
+        const auto device_coord = MapToDeviceCoords(current_pos.x(), current_pos.y());
+        if (device_coord) {
+            drag_state.dot->setProperty(PropX, device_coord->x());
+            drag_state.dot->setProperty(PropY, device_coord->y());
+            PositionDot(drag_state.dot, device_coord->x(), device_coord->y());
+            emit DotMoved(drag_state.dot->property(PropId).toInt(), *device_coord);
+            if (coord_label) {
+                coord_label->setText(
+                    QStringLiteral("X: %1, Y: %2").arg(device_coord->x()).arg(device_coord->y()));
+            }
+        }
+        return true;
+    }
+    case QEvent::Type::MouseButtonRelease: {
+        drag_state.dot.clear();
+        drag_state.active = false;
+        return true;
+    }
+    default:
+        break;
+    }
+    return obj->eventFilter(obj, event);
+}
+
+std::optional<QPoint> TouchScreenPreview::MapToDeviceCoords(const int screen_x,
+                                                            const int screen_y) const {
+    const float t_x = 0.5f + static_cast<float>(screen_x - contentsMargins().left()) *
+                                 (Core::kScreenBottomWidth - 1) / (contentsRect().width() - 1);
+    const float t_y = 0.5f + static_cast<float>(screen_y - contentsMargins().top()) *
+                                 (Core::kScreenBottomHeight - 1) / (contentsRect().height() - 1);
+    if (t_x >= 0.5f && t_x < Core::kScreenBottomWidth && t_y >= 0.5f &&
+        t_y < Core::kScreenBottomHeight) {
+
+        return QPoint{static_cast<int>(t_x), static_cast<int>(t_y)};
+    }
+    return std::nullopt;
+}
+
+void TouchScreenPreview::PositionDot(QLabel* const dot, const int device_x,
+                                     const int device_y) const {
+    dot->move(static_cast<int>(
+                  static_cast<float>(device_x >= 0 ? device_x : dot->property(PropX).toInt()) *
+                      (contentsRect().width() - 1) / (Core::kScreenBottomWidth - 1) +
+                  contentsMargins().left() - static_cast<float>(dot->width()) / 2 + 0.5f),
+              static_cast<int>(
+                  static_cast<float>(device_y >= 0 ? device_y : dot->property(PropY).toInt()) *
+                      (contentsRect().height() - 1) / (Core::kScreenBottomHeight - 1) +
+                  contentsMargins().top() - static_cast<float>(dot->height()) / 2 + 0.5f));
+}

src/citra_qt/configuration/configure_touch_from_button.h

@@ -0,0 +1,85 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <vector>
+#include <QDialog>
+#include "core/settings.h"
+
+class QItemSelection;
+class QModelIndex;
+class QStandardItemModel;
+class QStandardItem;
+class QTimer;
+
+namespace Common {
+class ParamPackage;
+}
+
+namespace InputCommon {
+namespace Polling {
+class DevicePoller;
+}
+} // namespace InputCommon
+
+namespace Ui {
+class ConfigureTouchFromButton;
+}
+
+class ConfigureTouchFromButton : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit ConfigureTouchFromButton(QWidget* parent,
+                                      const std::vector<Settings::TouchFromButtonMap>& touch_maps,
+                                      int default_index = 0);
+    ~ConfigureTouchFromButton() override;
+
+    int GetSelectedIndex() const;
+    std::vector<Settings::TouchFromButtonMap> GetMaps() const;
+
+public slots:
+    void ApplyConfiguration();
+    void NewBinding(const QPoint& pos);
+    void SetActiveBinding(int dot_id);
+    void SetCoordinates(int dot_id, const QPoint& pos);
+
+protected:
+    virtual void showEvent(QShowEvent* ev) override;
+    virtual void keyPressEvent(QKeyEvent* event) override;
+
+private slots:
+    void NewMapping();
+    void DeleteMapping();
+    void RenameMapping();
+    void EditBinding(const QModelIndex& qi);
+    void DeleteBinding();
+    void OnBindingSelection(const QItemSelection& selected, const QItemSelection& deselected);
+    void OnBindingChanged(QStandardItem* item);
+    void OnBindingDeleted(const QModelIndex& parent, int first, int last);
+
+private:
+    void SetConfiguration();
+    void UpdateUiDisplay();
+    void ConnectEvents();
+    void GetButtonInput(int row_index, bool is_new);
+    void SetPollingResult(const Common::ParamPackage& params, bool cancel);
+    void SaveCurrentMapping();
+
+    std::unique_ptr<Ui::ConfigureTouchFromButton> ui;
+    std::unique_ptr<QStandardItemModel> binding_list_model;
+    std::vector<Settings::TouchFromButtonMap> touch_maps;
+    int selected_index;
+
+    std::unique_ptr<QTimer> timeout_timer;
+    std::unique_ptr<QTimer> poll_timer;
+    std::vector<std::unique_ptr<InputCommon::Polling::DevicePoller>> device_pollers;
+    std::optional<std::function<void(const Common::ParamPackage&, bool)>> input_setter;
+
+    static constexpr int DataRoleDot = Qt::ItemDataRole::UserRole + 2;
+};

src/citra_qt/configuration/configure_touch_from_button.ui

@@ -0,0 +1,231 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ConfigureTouchFromButton</class>
+ <widget class="QDialog" name="ConfigureTouchFromButton">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>500</width>
+    <height>500</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Configure Touchscreen Mappings</string>
+  </property>
+  <layout class="QVBoxLayout">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Mapping:</string>
+       </property>
+       <property name="textFormat">
+        <enum>Qt::PlainText</enum>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="mapping">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="button_new">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>New</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="button_delete">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>Delete</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="button_rename">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>Rename</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>Click the bottom area to add a point, then press a button to bind.
+Drag points to change position, or double-click table cells to edit values.</string>
+       </property>
+       <property name="textFormat">
+        <enum>Qt::PlainText</enum>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="button_delete_bind">
+       <property name="text">
+        <string>Delete Point</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QTreeView" name="binding_list">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="rootIsDecorated">
+      <bool>false</bool>
+     </property>
+     <property name="uniformRowHeights">
+      <bool>true</bool>
+     </property>
+     <property name="itemsExpandable">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="TouchScreenPreview" name="bottom_screen">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="minimumSize">
+      <size>
+       <width>160</width>
+       <height>120</height>
+      </size>
+     </property>
+     <property name="baseSize">
+      <size>
+       <width>320</width>
+       <height>240</height>
+      </size>
+     </property>
+     <property name="cursor">
+      <cursorShape>CrossCursor</cursorShape>
+     </property>
+     <property name="mouseTracking">
+      <bool>true</bool>
+     </property>
+     <property name="autoFillBackground">
+      <bool>true</bool>
+     </property>
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Sunken</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_3">
+     <item>
+      <widget class="QLabel" name="coord_label">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="textFormat">
+        <enum>Qt::PlainText</enum>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QDialogButtonBox" name="buttonBox">
+       <property name="standardButtons">
+        <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>TouchScreenPreview</class>
+   <extends>QFrame</extends>
+   <header>citra_qt/configuration/configure_touch_widget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ConfigureTouchFromButton</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>249</x>
+     <y>428</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>249</x>
+     <y>224</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/citra_qt/configuration/configure_touch_widget.h

@@ -0,0 +1,61 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <optional>
+#include <utility>
+#include <vector>
+#include <QFrame>
+#include <QPointer>
+
+class QLabel;
+
+// Widget for representing touchscreen coordinates
+class TouchScreenPreview : public QFrame {
+    Q_OBJECT
+    Q_PROPERTY(QColor dotHighlightColor MEMBER dot_highlight_color)
+
+public:
+    explicit TouchScreenPreview(QWidget* parent);
+    ~TouchScreenPreview() override;
+
+    void SetCoordLabel(QLabel*);
+    int AddDot(int device_x, int device_y);
+    void RemoveDot(int id);
+    void HighlightDot(int id, bool active = true) const;
+    void MoveDot(int id, int device_x, int device_y) const;
+
+signals:
+    void DotAdded(const QPoint& pos);
+    void DotSelected(int dot_id);
+    void DotMoved(int dot_id, const QPoint& pos);
+
+protected:
+    virtual void resizeEvent(QResizeEvent*) override;
+    virtual void mouseMoveEvent(QMouseEvent*) override;
+    virtual void leaveEvent(QEvent*) override;
+    virtual void mousePressEvent(QMouseEvent*) override;
+    virtual bool eventFilter(QObject*, QEvent*) override;
+
+private:
+    std::optional<QPoint> MapToDeviceCoords(int screen_x, int screen_y) const;
+    void PositionDot(QLabel* dot, int device_x = -1, int device_y = -1) const;
+
+    bool ignore_resize = false;
+    QPointer<QLabel> coord_label;
+
+    std::vector<std::pair<int, QLabel*>> dots;
+    int max_dot_id = 0;
+    QColor dot_highlight_color;
+    static constexpr char PropId[] = "dot_id";
+    static constexpr char PropX[] = "device_x";
+    static constexpr char PropY[] = "device_y";
+
+    struct {
+        bool active = false;
+        QPointer<QLabel> dot;
+        QPoint start_pos;
+    } drag_state;
+};

src/citra_qt/main.cpp

@@ -1693,6 +1693,7 @@ void GMainWindow::OnConfigure() {
     auto old_theme = UISettings::values.theme;
     const int old_input_profile_index = Settings::values.current_input_profile_index;
     const auto old_input_profiles = Settings::values.input_profiles;
+    const auto old_touch_from_button_maps = Settings::values.touch_from_button_maps;
     const bool old_discord_presence = UISettings::values.enable_discord_presence;
     auto result = configureDialog.exec();
     if (result == QDialog::Accepted) {
@@ -1718,6 +1719,7 @@ void GMainWindow::OnConfigure() {
         }
     } else {
         Settings::values.input_profiles = old_input_profiles;
+        Settings::values.touch_from_button_maps = old_touch_from_button_maps;
         Settings::LoadProfile(old_input_profile_index);
     }
 }

src/core/hle/service/hid/hid.cpp

@@ -103,6 +103,11 @@ void Module::LoadInputDevices() {
         Settings::values.current_input_profile.motion_device);
     touch_device = Input::CreateDevice<Input::TouchDevice>(
         Settings::values.current_input_profile.touch_device);
+    if (Settings::values.current_input_profile.use_touch_from_button) {
+        touch_btn_device = Input::CreateDevice<Input::TouchDevice>("engine:touch_from_button");
+    } else {
+        touch_btn_device.reset();
+    }
 }
 
 void Module::UpdatePadCallback(u64 userdata, s64 cycles_late) {
@@ -177,6 +182,9 @@ void Module::UpdatePadCallback(u64 userdata, s64 cycles_late) {
     bool pressed = false;
     float x, y;
     std::tie(x, y, pressed) = touch_device->GetStatus();
+    if (!pressed && touch_btn_device) {
+        std::tie(x, y, pressed) = touch_btn_device->GetStatus();
+    }
     touch_entry.x = static_cast<u16>(x * Core::kScreenBottomWidth);
     touch_entry.y = static_cast<u16>(y * Core::kScreenBottomHeight);
     touch_entry.valid.Assign(pressed ? 1 : 0);

src/core/hle/service/hid/hid.h

@@ -336,6 +336,7 @@ private:
     std::unique_ptr<Input::AnalogDevice> circle_pad;
     std::unique_ptr<Input::MotionDevice> motion_device;
     std::unique_ptr<Input::TouchDevice> touch_device;
+    std::unique_ptr<Input::TouchDevice> touch_btn_device;
 
     template <class Archive>
     void serialize(Archive& ar, const unsigned int);

src/core/settings.h

@@ -112,11 +112,18 @@ struct InputProfile {
     std::array<std::string, NativeAnalog::NumAnalogs> analogs;
     std::string motion_device;
     std::string touch_device;
+    bool use_touch_from_button;
+    int touch_from_button_map_index;
     std::string udp_input_address;
     u16 udp_input_port;
     u8 udp_pad_index;
 };
 
+struct TouchFromButtonMap {
+    std::string name;
+    std::vector<std::string> buttons;
+};
+
 struct Values {
     // CheckNew3DS
     bool is_new_3ds;
@@ -125,6 +132,7 @@ struct Values {
     InputProfile current_input_profile;       ///< The current input profile
     int current_input_profile_index;          ///< The current input profile index
     std::vector<InputProfile> input_profiles; ///< The list of input profiles
+    std::vector<TouchFromButtonMap> touch_from_button_maps;
 
     // Core
     bool use_cpu_jit;

src/input_common/CMakeLists.txt

@@ -7,6 +7,8 @@ add_library(input_common STATIC
     main.h
     motion_emu.cpp
     motion_emu.h
+    touch_from_button.cpp
+    touch_from_button.h
     sdl/sdl.cpp
     sdl/sdl.h
     udp/client.cpp

src/input_common/main.cpp

@@ -10,6 +10,7 @@
 #include "input_common/main.h"
 #include "input_common/motion_emu.h"
 #include "input_common/sdl/sdl.h"
+#include "input_common/touch_from_button.h"
 #include "input_common/udp/udp.h"
 
 namespace InputCommon {
@@ -26,6 +27,8 @@ void Init() {
                                                 std::make_shared<AnalogFromButton>());
     motion_emu = std::make_shared<MotionEmu>();
     Input::RegisterFactory<Input::MotionDevice>("motion_emu", motion_emu);
+    Input::RegisterFactory<Input::TouchDevice>("touch_from_button",
+                                               std::make_shared<TouchFromButtonFactory>());
 
     sdl = SDL::Init();
 
@@ -38,6 +41,7 @@ void Shutdown() {
     Input::UnregisterFactory<Input::AnalogDevice>("analog_from_button");
     Input::UnregisterFactory<Input::MotionDevice>("motion_emu");
     motion_emu.reset();
+    Input::UnregisterFactory<Input::TouchDevice>("touch_from_button");
     sdl.reset();
     udp.reset();
 }

src/input_common/touch_from_button.cpp

@@ -0,0 +1,49 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/3ds.h"
+#include "core/settings.h"
+#include "input_common/touch_from_button.h"
+
+namespace InputCommon {
+
+class TouchFromButtonDevice final : public Input::TouchDevice {
+public:
+    TouchFromButtonDevice() {
+        for (const auto& config_entry :
+             Settings::values
+                 .touch_from_button_maps[Settings::values.current_input_profile
+                                             .touch_from_button_map_index]
+                 .buttons) {
+
+            const Common::ParamPackage package{config_entry};
+            map.emplace_back(Input::CreateDevice<Input::ButtonDevice>(config_entry),
+                             std::clamp(package.Get("x", 0), 0, Core::kScreenBottomWidth),
+                             std::clamp(package.Get("y", 0), 0, Core::kScreenBottomHeight));
+        }
+    }
+
+    std::tuple<float, float, bool> GetStatus() const override {
+        for (const auto& m : map) {
+            const bool state = std::get<0>(m)->GetStatus();
+            if (state) {
+                const float x = static_cast<float>(std::get<1>(m)) / Core::kScreenBottomWidth;
+                const float y = static_cast<float>(std::get<2>(m)) / Core::kScreenBottomHeight;
+                return std::make_tuple(x, y, true);
+            }
+        }
+        return std::make_tuple(0.0f, 0.0f, false);
+    }
+
+private:
+    std::vector<std::tuple<std::unique_ptr<Input::ButtonDevice>, int, int>> map; // button, x, y
+};
+
+std::unique_ptr<Input::TouchDevice> TouchFromButtonFactory::Create(
+    const Common::ParamPackage& params) {
+
+    return std::make_unique<TouchFromButtonDevice>();
+}
+
+} // namespace InputCommon

src/input_common/touch_from_button.h

@@ -0,0 +1,24 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+/**
+ * A touch device factory that takes a list of button devices and combines them into a touch device.
+ */
+class TouchFromButtonFactory final : public Input::Factory<Input::TouchDevice> {
+public:
+    /**
+     * Creates a touch device from a list of button devices
+     * @param unused
+     */
+    std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override;
+};
+
+} // namespace InputCommon