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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ inputdev.h
+
+ OSD interface to input devices
+
+***************************************************************************/
+#ifndef MAME_OSD_INTERFACE_INPUTDEV_H
+#define MAME_OSD_INTERFACE_INPUTDEV_H
+
+#pragma once
+
+#include "inputcode.h"
+#include "inputfwd.h"
+
+#include <string_view>
+#include <tuple>
+#include <vector>
+
+
+namespace osd {
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// base for application representation of host input device
+
+class input_device
+{
+protected:
+ virtual ~input_device() = default;
+
+public:
+ using assignment_vector = std::vector<std::tuple<ioport_type, input_seq_type, input_seq> >;
+
+ // relative devices return ~512 units per on-screen pixel
+ static inline constexpr s32 RELATIVE_PER_PIXEL = 512;
+
+ // absolute devices return values between -65536 and +65536
+ static inline constexpr s32 ABSOLUTE_MIN = -65'536;
+ static inline constexpr s32 ABSOLUTE_MAX = 65'536;
+
+ // invalid memory value for axis polling
+ static inline constexpr s32 INVALID_AXIS_VALUE = 0x7fff'ffff;
+
+ // callback for getting the value of an individual input on a device
+ typedef s32 (*item_get_state_func)(void *device_internal, void *item_internal);
+
+ // add a control item to an input device
+ virtual input_item_id add_item(
+ std::string_view name,
+ std::string_view tokenhint,
+ input_item_id itemid,
+ item_get_state_func getstate,
+ void *internal) = 0;
+
+ // set additional default assignments suitable for device
+ virtual void set_default_assignments(assignment_vector &&assignments) = 0;
+};
+
+} // namespace osd
+
+#endif // MAME_OSD_INTERFACE_INPUTDEV_H