handle input devices in the c++ application

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/nes/app/input/input-device-controller.hh b/lib/nes/app/input/input-device-controller.hh
new file mode 100644
index 0000000..6adb79c
--- /dev/null
+++ b/lib/nes/app/input/input-device-controller.hh
@@ -0,0 +1,38 @@
+#pragma once
+
+#include "nes/app/input/input-device.hh"
+#include "nes/common/list.hh"
+#include <string_view>
+
+namespace nes
+{
+	/// A game controller input device.
+	class input_device_controller : public input_device, public list<input_device_controller>::node
+	{
+	public:
+		enum class index
+		{
+			unused = -1,
+			player_1 = 0,
+			player_2 = 1,
+		};
+
+		/// Indicates whether the controller can be trusted to actually exist.
+		///
+		/// If this returns false, the controller is not automatically selected on startup if there is no other
+		/// controller already selected.
+		virtual auto is_reliable() const -> bool = 0;
+
+		/// Human-readable name for the controller.
+		virtual auto get_name() const -> std::string_view = 0;
+
+		/// Get the (persistent) player index for the controller, if already set before.
+		virtual auto get_index() const -> index = 0;
+
+		/// Set the (persistent) player index for the controller.
+		virtual auto set_index(index) -> void = 0;
+
+	protected:
+		explicit input_device_controller() = default;
+	};
+} // namespace nes
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