Merge pull request #5270 from german77/multiTouch

HID: Add multitouch support

src/core/frontend/emu_window.cpp

@@ -21,21 +21,18 @@ public:
 
     std::mutex mutex;
 
-    bool touch_pressed = false; ///< True if touchpad area is currently pressed, otherwise false
-
-    float touch_x = 0.0f; ///< Touchpad X-position
-    float touch_y = 0.0f; ///< Touchpad Y-position
+    Input::TouchStatus status;
 
 private:
     class Device : public Input::TouchDevice {
     public:
         explicit Device(std::weak_ptr<TouchState>&& touch_state) : touch_state(touch_state) {}
-        std::tuple<float, float, bool> GetStatus() const override {
+        Input::TouchStatus GetStatus() const override {
             if (auto state = touch_state.lock()) {
                 std::lock_guard guard{state->mutex};
-                return std::make_tuple(state->touch_x, state->touch_y, state->touch_pressed);
+                return state->status;
             }
-            return std::make_tuple(0.0f, 0.0f, false);
+            return {};
         }
 
     private:
@@ -79,36 +76,44 @@ std::tuple<unsigned, unsigned> EmuWindow::ClipToTouchScreen(unsigned new_x, unsi
     return std::make_tuple(new_x, new_y);
 }
 
-void EmuWindow::TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y) {
-    if (!IsWithinTouchscreen(framebuffer_layout, framebuffer_x, framebuffer_y))
+void EmuWindow::TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y, std::size_t id) {
+    if (!IsWithinTouchscreen(framebuffer_layout, framebuffer_x, framebuffer_y)) {
         return;
+    }
+    if (id >= touch_state->status.size()) {
+        return;
+    }
 
     std::lock_guard guard{touch_state->mutex};
-    touch_state->touch_x =
+    const float x =
         static_cast<float>(framebuffer_x - framebuffer_layout.screen.left) /
         static_cast<float>(framebuffer_layout.screen.right - framebuffer_layout.screen.left);
-    touch_state->touch_y =
+    const float y =
         static_cast<float>(framebuffer_y - framebuffer_layout.screen.top) /
         static_cast<float>(framebuffer_layout.screen.bottom - framebuffer_layout.screen.top);
 
-    touch_state->touch_pressed = true;
+    touch_state->status[id] = std::make_tuple(x, y, true);
 }
 
-void EmuWindow::TouchReleased() {
+void EmuWindow::TouchReleased(std::size_t id) {
+    if (id >= touch_state->status.size()) {
+        return;
+    }
     std::lock_guard guard{touch_state->mutex};
-    touch_state->touch_pressed = false;
-    touch_state->touch_x = 0;
-    touch_state->touch_y = 0;
+    touch_state->status[id] = std::make_tuple(0.0f, 0.0f, false);
 }
 
-void EmuWindow::TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y) {
-    if (!touch_state->touch_pressed)
+void EmuWindow::TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y, std::size_t id) {
+    if (id >= touch_state->status.size()) {
+        return;
+    }
+    if (!std::get<2>(touch_state->status[id]))
         return;
 
     if (!IsWithinTouchscreen(framebuffer_layout, framebuffer_x, framebuffer_y))
         std::tie(framebuffer_x, framebuffer_y) = ClipToTouchScreen(framebuffer_x, framebuffer_y);
 
-    TouchPressed(framebuffer_x, framebuffer_y);
+    TouchPressed(framebuffer_x, framebuffer_y, id);
 }
 
 void EmuWindow::UpdateCurrentFramebufferLayout(unsigned width, unsigned height) {

src/core/frontend/emu_window.h

@@ -117,18 +117,23 @@ public:
      * Signal that a touch pressed event has occurred (e.g. mouse click pressed)
      * @param framebuffer_x Framebuffer x-coordinate that was pressed
      * @param framebuffer_y Framebuffer y-coordinate that was pressed
+     * @param id Touch event ID
      */
-    void TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y);
+    void TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y, std::size_t id);
 
-    /// Signal that a touch released event has occurred (e.g. mouse click released)
-    void TouchReleased();
+    /**
+     * Signal that a touch released event has occurred (e.g. mouse click released)
+     * @param id Touch event ID
+     */
+    void TouchReleased(std::size_t id);
 
     /**
      * Signal that a touch movement event has occurred (e.g. mouse was moved over the emu window)
      * @param framebuffer_x Framebuffer x-coordinate
      * @param framebuffer_y Framebuffer y-coordinate
+     * @param id Touch event ID
      */
-    void TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y);
+    void TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y, std::size_t id);
 
     /**
      * Returns currently active configuration.

src/core/frontend/input.h

@@ -163,10 +163,11 @@ using MotionStatus = std::tuple<Common::Vec3<float>, Common::Vec3<float>, Common
 using MotionDevice = InputDevice<MotionStatus>;
 
 /**
- * A touch status is an object that returns a tuple of two floats and a bool. The floats are
- * x and y coordinates in the range 0.0 - 1.0, and the bool indicates whether it is pressed.
+ * A touch status is an object that returns an array of 16 tuple elements of two floats and a bool.
+ * The floats are x and y coordinates in the range 0.0 - 1.0, and the bool indicates whether it is
+ * pressed.
  */
-using TouchStatus = std::tuple<float, float, bool>;
+using TouchStatus = std::array<std::tuple<float, float, bool>, 16>;
 
 /**
  * A touch device is an input device that returns a touch status object