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Device Query Functions

The following functions query per-device configuration parameters. They will return 0 if the device or calibration isn't found.

Returns

varies

Args

Device index.

A note on device indexing: HoloPlay Service assigns each connected device a persistent index, starting from 0. When a new device is connected, HoloPlay Service will assign it the lowest index available.

In certain situations, there may be no device present at a certain index. For instance, if two devices are connected, they will receive indices 0, then 1, respectively. If the device indexed 0 is disconnected, there will be a device present at index 1 but not at index 0. The next device to be connected will be assigned index 0.

hpc_GetDevicePropertyWinX

int hpc_GetDevicePropertyWinX(int dev_index)

Returns

X position of monitor, in window coordinates, reported by OS.

Args

Device Index


hpc_GetDevicePropertyWinY

int hpc_GetDevicePropertyWinY(int dev_index)

Returns

Y position of monitor, in window coordinates, reported by OS.

Args

Device Index


The following functions return values retrieved from the lenticular calibration file associated with the device and transmitted over USB. They should be loaded into the lenticular shader as uniform parameters of the same name and type.

hpc_GetDevicePropertyScreenW

int hpc_GetDevicePropertyScreenW(int dev_index)

Returns

Screen width in pixels.

Args

Device Index


hpc_GetDevicePropertyScreenH

int hpc_GetDevicePropertyScreenH(int dev_index)

Returns

Screen height in pixels.

Args

Device Index


hpc_GetDevicePropertyInvView

int hpc_GetDevicePropertyInvView(int dev_index)

Returns

Whether the lenticular shader should be inverted. (1 or 0)

Args

Device Index


hpc_GetDevicePropertyRi

int hpc_GetDevicePropertyRi(int dev_index)

Returns

'Red index' of each lenticular subpixel. (0 or 2)

Args

Device Index


hpc_GetDevicePropertyBi

int hpc_GetDevicePropertyBi(int dev_index)

Returns

'Blue index' of each lenticular subpixel. (0 or 2)

Args

Device Index


hpc_GetDevicePropertyPitch

float hpc_GetDevicePropertyPitch(int dev_index)

Returns

Lenticular lens pitch.

Args

Device Index


hpc_GetDevicePropertyCenter

float hpc_GetDevicePropertyCenter(int dev_index)

Returns

Lenticular center offset.

Args

Device Index


hpc_GetDevicePropertyTilt

float hpc_GetDevicePropertyTilt(int dev_index)

Returns

Lenticular tilt angle.

Args

Device Index


hpc_GetDevicePropertyAspect

float hpc_GetDevicePropertyAspect(int dev_index)

Returns

Display aspect ratio (Equal to ScreenW/ScreenH).

Args

Device Index


hpc_GetDevicePropertyFringe

float hpc_GetDevicePropertyFringe(int dev_index)

Returns

Display fringe correction uniform (currently only applicable to 15.6" Developer/Pro units).

Args

Device Index


hpc_GetDevicePropertySubp

float hpc_GetDevicePropertySubp(int dev_index)

Returns

Display subpixel size.

Args

Device Index