Support gyroscope with DS4 emulation

[Crayon2000]

In UsendMii, add support for gyroscope with DualShock 4 emulation (ViGEm).

What we know from the VPADStatus structure:

Item	Description
gyro	The value of the DRC angular velocity in each direction. 360 dps is expressed as a value ranging from 0 to 1.
angle	The value of the DRC rotational angle obtained by calculating the value of the angular velocity in each direction. 360 degrees is expressed as a value ranging from 0 to 1.0.

In ViGEm the DS4_REPORT_EX structure:

typedef struct _DS4_REPORT_EX
{
	union
	{
		struct
		{
//...
			SHORT wGyroX;
			SHORT wGyroY;
			SHORT wGyroZ;
//...
		} Report;

		UCHAR ReportBuffer[63];
	};
} DS4_REPORT_EX, *PDS4_REPORT_EX;

From the README in https://github.com/jangxx/node-ViGEmClient:

Sets the gyroscope orientation. Each value is in degrees and must be between -2000 and 2000.

This is all the information I have right now about the gyroscope on the WiiU GamePad and the DualShock 4!

[Crayon2000]

What I have done so far is take the angle from the Wii U GamePad and use it in this method to fill a ViGEm report:

void TDualShockController::SetGyro(const float AX, const float AY, const float AZ)
{
    FReport.Report.wGyroX = floor((AX * 360.0f) + 0.5f);
    FReport.Report.wGyroY = floor((AY * 360.0f) + 0.5f);
    FReport.Report.wGyroZ = floor((AZ * 360.0f) + 0.5f);
}

The only software I have to test the emulated DS4 is Fortnite. I have never tried a real DS4 in the game because I don't have one. It's doing something, but I have no clue if it's working as expected!

Here is the version to test: UsendMii-Gyro-Test.zip

ViGEmBus v1.17.333 is required.

[Crayon2000]

Interesting links:

• https://github.com/torvalds/linux/blob/master/drivers/hid/hid-sony.c#L1106
• https://controllers.fandom.com/wiki/Sony_DualShock_4#Input_Reports
• Add touchscreen support for the Dualshock 4 touchpad nefarius/ViGEmBus#11

[BalisticNick]

ok, have tested this out on cemu and it is definitely registering input but it almost seems that the values that it is getting are subdued in a way like a full 180 only registers as a very tiny movement. please ask if you need any help, I do own a ps5 controller if that means anything.

[Victorsitou]

Any news on this?

[netux]

I can confirm what everyone else is saying about that test build: the gyro is very damped compared to the cube shown in the USendMii, and I also noticed some random drift.

What I have done so far is take the angle from the Wii U GamePad and use it in this method to fill a ViGEm report:

void TDualShockController::SetGyro(const float AX, const float AY, const float AZ)
{
    FReport.Report.wGyroX = floor((AX * 360.0f) + 0.5f);
    FReport.Report.wGyroY = floor((AY * 360.0f) + 0.5f);
    FReport.Report.wGyroZ = floor((AZ * 360.0f) + 0.5f);
}

Here you are converting the Wii U GamePad gyro values (I assume going from 0.0 to 1.0?) to degrees (0.0 to 360.0)
But you also mentioned ViGEm expects values from -2000 to +2000. So maybe the code should be like so?

void TDualShockController::SetGyro(const float AX, const float AY, const float AZ)
{
    FReport.Report.wGyroX = floor((AX * 4000.0f) - 2000.0f);
    FReport.Report.wGyroY = floor((AY * 4000.0f) - 2000.0f);
    FReport.Report.wGyroZ = floor((AZ * 4000.0f) - 2000.0f);
}

[Daerdaal]

As thre are not much update here, and as the UsendMii code is not open, i wonder if it would be possible to make changes "in the over side". I mean change a little the ViGEm code and make a "special wiiU to DS4 version" that modifie wGyroX, wGyroY, and wGyroZDS4_inside the ViGEm REPORT_EX structure ?

[hotpotatodude]

any updates on this?

[Awesome-guyy]

@Crayon2000 I will test this later today. 👍

[Awesome-guyy]

Bad news: Gyro input works, but it is very weak.

[Mazdafaca]

How do I set this up? Ive installed vigembus, but i cant set up the gyro on cemu or citron emulator.