Add an option to automatically map controller buttons

This uses SDL's GameController API to map buttons to the DS ones
automatically based on their controller database.

src/frontend/qt_sdl/Config.cpp

@@ -103,6 +103,7 @@ DefaultList<bool> DefaultBools =
     {"Emu.DirectBoot", true},
     {"Instance*.DS.Battery.LevelOkay", true},
     {"Instance*.DSi.Battery.Charging", true},
+    {"Instance*.Joystick.AutoMap", true},
 #ifdef JIT_ENABLED
     {"JIT.BranchOptimisations", true},
     {"JIT.LiteralOptimisations", true},

src/frontend/qt_sdl/EmuInstance.h

@@ -146,6 +146,7 @@ public:
     void setJoystick(int id);
     int getJoystickID() { return joystickID; }
     SDL_Joystick* getJoystick() { return joystick; }
+    bool autoJoystickMapping;
 
     void touchScreen(int x, int y);
     void releaseScreen();

src/frontend/qt_sdl/EmuInstanceInput.cpp

@@ -40,6 +40,24 @@ const char* EmuInstance::buttonNames[12] =
     "Y"
 };
 
+SDL_GameControllerButton sdlButtons[12] =
+{
+    // SDL uses A/B for south/east, X/Y for west/north, opposite of the DS
+    // so we swap the buttons so they map to where they are on the DS positionally
+    SDL_CONTROLLER_BUTTON_B,
+    SDL_CONTROLLER_BUTTON_A,
+    SDL_CONTROLLER_BUTTON_BACK,
+    SDL_CONTROLLER_BUTTON_START,
+    SDL_CONTROLLER_BUTTON_DPAD_RIGHT,
+    SDL_CONTROLLER_BUTTON_DPAD_LEFT,
+    SDL_CONTROLLER_BUTTON_DPAD_UP,
+    SDL_CONTROLLER_BUTTON_DPAD_DOWN,
+    SDL_CONTROLLER_BUTTON_RIGHTSHOULDER,
+    SDL_CONTROLLER_BUTTON_LEFTSHOULDER,
+    SDL_CONTROLLER_BUTTON_Y,
+    SDL_CONTROLLER_BUTTON_X
+};
+
 const char* EmuInstance::hotkeyNames[HK_MAX] =
 {
     "HK_Lid",
@@ -107,6 +125,8 @@ void EmuInstance::inputLoadConfig()
         hkJoyMapping[i] = joycfg.GetInt(hotkeyNames[i]);
     }
 
+    autoJoystickMapping = joycfg.GetBool("AutoMap");
+
     setJoystick(localCfg.GetInt("JoystickID"));
 }
 
@@ -335,7 +355,14 @@ void EmuInstance::inputProcess()
     }
 
     joyInputMask = 0xFFF;
-    if (joystick)
+
+    if (autoJoystickMapping && controller != nullptr)
+    {
+        for (int i = 0; i < 12; i++)
+            if (SDL_GameControllerGetButton(controller, sdlButtons[i]))
+                joyInputMask &= ~(1 << i);
+    }
+    else if (joystick)
     {
         for (int i = 0; i < 12; i++)
             if (joystickButtonDown(joyMapping[i]))

src/frontend/qt_sdl/InputConfig/InputConfigDialog.cpp

@@ -94,6 +94,8 @@ InputConfigDialog::InputConfigDialog(QWidget* parent) : QDialog(parent), ui(new
         ui->cbxJoystick->setEnabled(false);
     }
 
+    ui->cbAutoMap->setChecked(joycfg.GetBool("AutoMap"));
+
     setupKeypadPage();
 
     int inst = emuInstance->getInstanceID();
@@ -124,7 +126,7 @@ void InputConfigDialog::setupKeypadPage()
         delete pushButtonKey;
         delete pushButtonJoy;
 
-        if (ui->cbxJoystick->isEnabled())
+        if (ui->cbxJoystick->isEnabled() && !ui->cbAutoMap->isChecked())
         {
             ui->stackMapping->setCurrentIndex(1);
         }
@@ -214,6 +216,7 @@ void InputConfigDialog::on_InputConfigDialog_accepted()
     }
 
     instcfg.SetInt("JoystickID", joystickID);
+    joycfg.SetBool("AutoMap", ui->cbAutoMap->isChecked());
     Config::Save();
 
     emuInstance->inputLoadConfig();
@@ -246,6 +249,25 @@ void InputConfigDialog::on_cbxJoystick_currentIndexChanged(int id)
 
     joystickID = id;
     emuInstance->setJoystick(id);
+    setJoyMappingEnabled(ui->cbAutoMap->isChecked());
+}
+
+void InputConfigDialog::on_cbAutoMap_checkStateChanged(Qt::CheckState state)
+{
+    setJoyMappingEnabled(state);
+}
+
+void InputConfigDialog::setJoyMappingEnabled(bool enable)
+{
+    if (enable && SDL_IsGameController(emuInstance->getJoystickID()))
+    {
+        ui->stackMapping->setCurrentIndex(0);
+        ui->btnJoyMapSwitch->setEnabled(false);
+    }
+    else
+    {
+        ui->btnJoyMapSwitch->setEnabled(true);
+    }
 }
 
 SDL_Joystick* InputConfigDialog::getJoystick()

src/frontend/qt_sdl/InputConfig/InputConfigDialog.h

@@ -123,6 +123,7 @@ private slots:
     void on_btnKeyMapSwitch_clicked();
     void on_btnJoyMapSwitch_clicked();
     void on_cbxJoystick_currentIndexChanged(int id);
+    void on_cbAutoMap_checkStateChanged(Qt::CheckState state);
 
 private:
     void populatePage(QWidget* page,
@@ -130,6 +131,8 @@ private:
         int* keymap, int* joymap);
     void setupKeypadPage();
 
+    void setJoyMappingEnabled(bool enabled);
+
     Ui::InputConfigDialog* ui;
 
     EmuInstance* emuInstance;

src/frontend/qt_sdl/InputConfig/InputConfigDialog.ui

@@ -2280,7 +2280,7 @@
     </widget>
    </item>
    <item row="7" column="0" colspan="2">
-    <layout class="QHBoxLayout" name="horizontalLayout">
+    <layout class="QGridLayout" name="gridLayout_5">
      <property name="leftMargin">
       <number>0</number>
      </property>
@@ -2293,7 +2293,20 @@
      <property name="bottomMargin">
       <number>0</number>
      </property>
-     <item>
+     <item row="0" column="2">
+      <widget class="QComboBox" name="cbxJoystick">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="whatsThis">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Selects which joystick will be used for joystick input, if any is present.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0">
       <widget class="QLabel" name="label">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
@@ -2306,16 +2319,13 @@
        </property>
       </widget>
      </item>
-     <item>
-      <widget class="QComboBox" name="cbxJoystick">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
+     <item row="1" column="2">
+      <widget class="QCheckBox" name="cbAutoMap">
+       <property name="toolTip">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Automatically map joystick buttons to their closest equivalents on the DS for controllers that are known to SDL's game controller database.&lt;/p&gt;&lt;p&gt;The joystick mappings page will be disabled when automatic mapping is in effect.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
        </property>
-       <property name="whatsThis">
-        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Selects which joystick will be used for joystick input, if any is present.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       <property name="text">
+        <string>Automatically map joystick buttons</string>
        </property>
       </widget>
      </item>

src/frontend/qt_sdl/main.cpp

@@ -298,6 +298,9 @@ int main(int argc, char** argv)
 
     // http://stackoverflow.com/questions/14543333/joystick-wont-work-using-sdl
     SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
+    // Use position-based button mapping instead of label-based
+    // Needed to make auto mapping map the face buttons correctly regardless of layout
+    SDL_SetHint(SDL_HINT_GAMECONTROLLER_USE_BUTTON_LABELS, "0");
 
     SDL_SetHint(SDL_HINT_APP_NAME, "melonDS");