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HoloPlay Service Related

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Device Status

If HoloPlay Service receives an info command, it will respond with information about HoloPlay Service and any connected devices.

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Example Response

{
  "error": 0,
  "version": "1.0.0",
  "devices": [
    {
      "hwid": "LKG030nffpp24",
      "state": "hidden",
      "windowCoords": [1920, 0],
      "hardwareVersion": "standard",
      "buttons": {
        [0, 0, 0, 0]
      }
      "calibration": {
        "pitch": 50.060001373291016,
        "slope": -7.7369561195373535,
        "center": 0.26147353649139404,
    ...
      }
    {
  ]
}

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Field Descriptions

version

The version of HoloPlay Service installed on the machine.

devices

An array of all devices currently connected.

devices[idx].state

The state of the specified device. Can be one of the following states:

  • hidden — the window is not visible.

  • ok — the window exists and is ready to receive content.

  • nocalibration — there's an error reading calibration, please ensure your cables are connected.

devices[idx].windowCoords

Display position of the device as window coordinates. The position is relative to the top left-hand corner of the main monitor.

devices[idx].hardwareVersion

Can be standard, large, pro, or 8k. Standard refers to the 8.9" Looking Glassarrow-up-right, large to the 15.6" unitarrow-up-right, pro to the 15.6" Proarrow-up-right, and 8K to the Looking Glass 8Karrow-up-right.

devices[idx].buttons

Whether or not each of the buttons is currently pressed for the specified device.

devices[idx].calibration

Calibration data for the specified device.

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Quilt Settings

A description of quilt view count and tiling. All parameters are optional.

  • vx (int) - number of columns.

    • default value: 1.

  • vy (int) - number of rows.

    • default value: 1.

  • vtotal (int) - total number of views in quilt.

    • default value: vx * vy.

    • only necessary for quilts that have "missing" views in some positions.

  • aspect (float) - original aspect ratio of the quilt.

    • default value: if unspecified, will match aspect ratio of target display (16/10 for the 8.9" Looking Glass, 16/9 for the 15.6" Looking Glass, etc).

  • overscan (bool/int) - scaling setting when on a device with a different aspect ratio than the quilt. It only makes a difference when the quilt aspect is specified and its different than the aspect ratio of the Looking Glass.

    • default value: 0.

    • overscan=1 scales the image until it fills all possible space on the display, cutting out extra part of image.

    • overscan=0 scales the image until its largest side fits the display, leaving black edges on the other sides.

    • overscan has no effect if aspect is either unspecified or equal to the resolution of the target display.

  • invert (bool/int) - inverted view cone setting.

    • default value: 0.

    • invert=1 causes the views to be read in the opposite order as they are encoded in the texture, from the top right to the bottom left.

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Error Codes

Every command issued to the driver has a corresponding response issued in CBOR format. At minimum, the response contains an error code, which may be one of the following:

Error

Description

0

No error, everything ok.

1

CBOR parser failure.

2

Driver could not understand the command.

3

Driver expected an image file in binary data, but could not read one.

4

Client attempted to draw to a Looking Glass that is not connected or has no calibration.

5

Client attempted to load a nonexistent key from the cache.

6

Client attempted to register an app ID after sending one or more messages.

7

Client attempted to do something that is not allowed (i.e., tried to take over a display currently occupied by a greedy process).

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