private static int MakeKey(short collection, HidPage page, short usage)
{
var coll_byte = unchecked ((byte)collection);
var page_byte = unchecked ((byte)((((ushort)page & 0xff00) >> 8) | ((ushort)page & 0xff)));
return((coll_byte << 24) | (page_byte << 16) | unchecked ((ushort)usage));
}
private RawInputDevice(ushort usage, RawInputDeviceFlags flags, IntPtr target, HidPage usagePage)
{
Usage = usage;
Flags = flags;
Target = target;
UsagePage = usagePage;
}
private JoystickHat GetHat(short collection, HidPage page, short usage)
{
var key = MakeKey(collection, page, usage);
if (!hats.ContainsKey(key))
{
hats.Add(key, JoystickHat.Hat0 + hats.Count);
}
return(hats[key]);
}
private int GetButton(short collection, HidPage page, short usage)
{
var key = MakeKey(collection, page, usage);
if (!buttons.ContainsKey(key))
{
buttons.Add(key, buttons.Count);
}
return(buttons[key]);
}
/// <summary>
/// Translates a generic HID usage value to a specific joystick axis for the specified <see cref="HidPage"/>.
/// </summary>
/// <param name="page">The HID usage page.</param>
/// <param name="usage">The generic usage value.</param>
/// <returns>An <see cref="int"/> that maps the HID usage value to a joystick axis.</returns>
public static int TranslateJoystickAxis(HidPage page, int usage)
{
switch (page)
{
case HidPage.GenericDesktop:
switch ((HidGenericDesktopUsage)usage)
{
case HidGenericDesktopUsage.X:
return(0);
case HidGenericDesktopUsage.Y:
return(1);
case HidGenericDesktopUsage.Z:
return(2);
case HidGenericDesktopUsage.RotationZ:
return(3);
case HidGenericDesktopUsage.RotationX:
return(4);
case HidGenericDesktopUsage.RotationY:
return(5);
case HidGenericDesktopUsage.Slider:
return(6);
case HidGenericDesktopUsage.Dial:
return(7);
case HidGenericDesktopUsage.Wheel:
return(8);
}
break;
case HidPage.Simulation:
switch ((HidSimulationUsage)usage)
{
case HidSimulationUsage.Rudder:
return(9);
case HidSimulationUsage.Throttle:
return(10);
}
break;
}
Debug.Print($"[Input] Unknown axis with HID page/usage {page}/{usage}");
return(0);
}
private int GetAxis(short collection, HidPage page, short usage)
{
var key = MakeKey(collection, page, usage);
if (!axes.ContainsKey(key))
{
var axis = HidHelper.TranslateJoystickAxis(page, usage);
axes.Add(key, axis);
}
return(axes[key]);
}
public void SetAxis(short collection, HidPage page, short usage, short value)
{
// set axis only when HidPage is known by HidHelper.TranslateJoystickAxis() to avoid axis0 to be overwritten by unknown HidPage
if (page == HidPage.GenericDesktop || page == HidPage.Simulation)
{
//Certain joysticks (Speedlink Black Widow, PS3 pad connected via USB)
//return an invalid HID page of 1, so
if (usage != 1)
{
var axis = GetAxis(collection, page, usage);
State.SetAxis(axis, value);
}
}
}
public void SetHat(short collection, HidPage page, short usage, HatPosition pos)
{
var hat = GetHat(collection, page, usage);
State.SetHat(hat, new JoystickHatState(pos));
}
public void SetButton(short collection, HidPage page, short usage, bool value)
{
var button = GetButton(collection, page, usage);
State.SetButton(button, value);
}
public static extern HidProtocolStatus GetUsageValue(HidProtocolReportType type,
HidPage usage_page, short link_collection, short usage, ref uint usage_value,
[In] byte[] preparsed_data, IntPtr report, int report_length);
public static extern unsafe HidProtocolStatus GetUsages(HidProtocolReportType type,
HidPage usage_page, short link_collection, short *usage_list, ref int usage_length,
[In] byte[] preparsed_data, IntPtr report, int report_length);
public static extern HidProtocolStatus GetSpecificButtonCaps(HidProtocolReportType ReportType,
HidPage UsagePage, ushort LinkCollection, ushort Usage,
[Out] HidProtocolButtonCaps[] ButtonCaps, ref ushort ButtonCapsLength,
[In] byte[] PreparsedData);
