handle input devices in the c++ application

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/nes/app/input/input-manager.hh b/lib/nes/app/input/input-manager.hh
new file mode 100644
index 0000000..10308c7
--- /dev/null
+++ b/lib/nes/app/input/input-manager.hh
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "nes/app/input/input-device-keyboard.hh"
+#include "nes/app/input/input-device-controller.hh"
+#include "nes/common/list.hh"
+
+namespace nes
+{
+	/// Manages input devices.
+	///
+	/// The main purpose of this class is to assign newly plugged in controllers as the primary/secondary input and fall
+	/// back to the keyboard if needed.
+	class input_manager
+	{
+		static constexpr auto input_count = std::size_t{ 2 };
+
+		input_device_keyboard* keyboard_;
+		list<input_device_controller> controllers_;
+		struct
+		{
+			input_device* device{ nullptr };
+			input_device_controller* controller{ nullptr };
+		} inputs_[input_count]{};
+
+	public:
+		explicit input_manager(input_device_keyboard&);
+
+		input_manager(input_manager const&) = delete;
+		input_manager(input_manager&&) = delete;
+		auto operator=(input_manager const&) -> input_manager& = delete;
+		auto operator=(input_manager&&) -> input_manager& = delete;
+
+		auto get_input_1() const -> input_device& { return *inputs_[0].device; }
+		auto get_input_2() const -> input_device& { return *inputs_[1].device; }
+
+		auto get_keyboard() const -> input_device_keyboard& { return *keyboard_; }
+		auto get_controllers() const -> list<input_device_controller> const& { return controllers_; }
+
+		auto add_controller(input_device_controller&) -> void;
+		auto remove_controller(input_device_controller&) -> void;
+
+	private:
+		auto fill_unassigned_inputs() -> void;
+	};
+} // namespace nes
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