ppsspp/Windows/HidInputDevice.h

// This file in particular along with its cpp file is public domain, use it for whatever you want.

#pragma once

#include "Common/Input/InputState.h"
#include "Windows/InputDevice.h"
#include <set>
#include <windows.h>

enum class HIDControllerType {
	DS4,
	DS5,
	SwitchPro,
};

struct HIDControllerState {
	// Analog sticks
	s8 stickAxes[4];  // LX LY RX RY
	// Analog triggers
	u8 triggerAxes[2];
	// Buttons. Here the mapping is specific to the controller type and resolved
	// later.
	u32 buttons;  // Bitmask, PSButton enum

	bool accValid = false;
	float accelerometer[3];  // X, Y, Z
};

struct ButtonInputMapping;

// Supports a few specific HID input devices, namely DualShock and DualSense.
// More may be added later. Just picks the first one available, for now.
class HidInputDevice : public InputDevice {
public:
	void Init() override;
	int UpdateState() override;
	void Shutdown() override;

	static void AddSupportedDevices(std::set<u32> *deviceVIDPIDs);
	bool HasAccelerometer() const override {
		return subType_ == HIDControllerType::DS5;
	}
private:
	void ReleaseAllKeys(const ButtonInputMapping *buttonMappings, int count);
	InputDeviceID DeviceID(int pad);
	HIDControllerState prevState_{};

	HIDControllerType subType_{};
	HANDLE controller_;
	int pad_ = 0;
	int pollCount_ = 0;
	int reportSize_ = 0;
	int outReportSize_ = 0;
	enum {
		POLL_FREQ = 283,  // a prime number.
	};
};