ruby/input: Add macOS mouse support

While keyboard and joypad input had already been present for some time,
mouse input for macOS remained unimplemented in ruby.

Until now, that is.

ruby/input/mouse/quartz.cpp

@@ -0,0 +1,82 @@
+#pragma once
+
+struct InputMouseQuartz {
+  Input& input;
+  InputMouseQuartz(Input& input) : input(input) {}
+
+  shared_pointer<HID::Mouse> hid{new HID::Mouse};
+
+  bool mouseAcquired = false;
+
+  auto acquire() -> bool {
+    if(!mouseAcquired) {
+      CGError error = CGAssociateMouseAndMouseCursorPosition(NO);
+      if(error != kCGErrorSuccess) return false;
+      [NSCursor hide];
+
+      mouseAcquired = true;
+    }
+    return true;
+  }
+
+  auto acquired() -> bool {
+    return mouseAcquired;
+  }
+
+  auto release() -> bool {
+    if(mouseAcquired) {
+      CGError error = CGAssociateMouseAndMouseCursorPosition(YES);
+      if(error != kCGErrorSuccess) return false;
+      [NSCursor unhide];
+
+      mouseAcquired = false;
+    }
+    return true;
+  }
+
+  auto assign(uint groupID, uint inputID, int16_t value) -> void {
+    auto& group = hid->group(groupID);
+    if(group.input(inputID).value() == value) return;
+    input.doChange(hid, groupID, inputID, group.input(inputID).value(), value);
+    group.input(inputID).setValue(value);
+  }
+
+  auto poll(vector<shared_pointer<HID::Device>>& devices) -> void {
+    int deltaX, deltaY;
+    CGGetLastMouseDelta(&deltaX, &deltaY);
+
+    assign(HID::Mouse::GroupID::Axis, 0, deltaX);
+    assign(HID::Mouse::GroupID::Axis, 1, deltaY);
+
+    NSUInteger buttons = [NSEvent pressedMouseButtons];
+
+    assign(HID::Mouse::GroupID::Button, 0, !!(buttons & (1 << 0)));
+    assign(HID::Mouse::GroupID::Button, 2, !!(buttons & (1 << 1)));
+    assign(HID::Mouse::GroupID::Button, 1, !!(buttons & (1 << 2)));
+    assign(HID::Mouse::GroupID::Button, 4, !!(buttons & (1 << 3)));
+    assign(HID::Mouse::GroupID::Button, 3, !!(buttons & (1 << 4)));
+
+    devices.append(hid);
+  }
+
+  auto initialize() -> bool {
+    hid->setVendorID(HID::Mouse::GenericVendorID);
+    hid->setProductID(HID::Mouse::GenericProductID);
+    hid->setPathID(0);
+
+    hid->axes().append("X");
+    hid->axes().append("Y");
+
+    hid->buttons().append("Left");
+    hid->buttons().append("Middle");
+    hid->buttons().append("Right");
+    hid->buttons().append("Up");
+    hid->buttons().append("Down");
+
+    return true;
+  }
+
+  auto terminate() -> void {
+    release();
+  }
+};

ruby/input/quartz.cpp

@@ -1,9 +1,10 @@
 #include "keyboard/quartz.cpp"
+#include "mouse/quartz.cpp"
 #include "joypad/iokit.cpp"
 
 struct InputQuartz : InputDriver {
   InputQuartz& self = *this;
-  InputQuartz(Input& super) : InputDriver(super), keyboard(super), joypad(super) {}
+  InputQuartz(Input& super) : InputDriver(super), keyboard(super), mouse(super), joypad(super) {}
   ~InputQuartz() { terminate(); }
 
   auto create() -> bool override {
@@ -13,13 +14,14 @@ struct InputQuartz : InputDriver {
   auto driver() -> string override { return "Quartz"; }
   auto ready() -> bool override { return isReady; }
 
-  auto acquired() -> bool override { return false; }
-  auto acquire() -> bool override { return false; }
-  auto release() -> bool override { return false; }
+  auto acquired() -> bool override { return mouse.acquired(); }
+  auto acquire() -> bool override { return mouse.acquire(); }
+  auto release() -> bool override { return mouse.release(); }
 
   auto poll() -> vector<shared_pointer<HID::Device>> override {
     vector<shared_pointer<HID::Device>> devices;
     keyboard.poll(devices);
+    mouse.poll(devices);
     joypad.poll(devices);
     return devices;
   }
@@ -32,6 +34,7 @@ private:
   auto initialize() -> bool {
     terminate();
     if(!keyboard.initialize()) return false;
+    if(!mouse.initialize()) return false;
     if(!joypad.initialize()) return false;
     return isReady = true;
   }
@@ -39,10 +42,12 @@ private:
   auto terminate() -> void {
     isReady = false;
     keyboard.terminate();
+    mouse.terminate();
     joypad.terminate();
   }
 
   bool isReady = false;
   InputKeyboardQuartz keyboard;
+  InputMouseQuartz mouse;
   InputJoypadIOKit joypad;
 };