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Libovr 1.30 Reference Guide

ovrPerfStats Struct Reference

This is a complete descriptor of the performance stats provided by the SDK.

Data Fields

ovrPerfStatsPerCompositorFrame
FrameStatsCount will have a maximum value set by ovrMaxProvidedFrameStats If the application calls ovr_GetPerfStats at the native refresh rate of the HMD then FrameStatsCount will be 1.
int
ovrBool
If the app calls ovr_GetPerfStats at less than 18 fps for CV1, then AnyFrameStatsDropped will be ovrTrue and FrameStatsCount will be equal to ovrMaxProvidedFrameStats.
float
AdaptiveGpuPerformanceScale is an edge-filtered value that a caller can use to adjust the graphics quality of the application to keep the GPU utilization in check.
ovrBool
Will be true if Async Spacewarp (ASW) is available for this system which is dependent on several factors such as choice of GPU, OS and debug overrides.
ovrProcessId
Contains the Process ID of the VR application the stats are being polled for If an app continues to grab perf stats even when it is not visible, then expect this value to point to the other VR app that has grabbed focus (i.e.

Detailed Description

Field Documentation

ovrPerfStatsPerCompositorFrame ovrPerfStats::FrameStats[ovrMaxProvidedFrameStats] ( )
FrameStatsCount will have a maximum value set by ovrMaxProvidedFrameStats If the application calls ovr_GetPerfStats at the native refresh rate of the HMD then FrameStatsCount will be 1.
If the app's workload happens to force ovr_GetPerfStats to be called at a lower rate, then FrameStatsCount will be 2 or more. If the app does not want to miss any performance data for any frame, it needs to ensure that it is calling ovr_SubmitFrame and ovr_GetPerfStats at a rate that is at least: "HMD_refresh_rate / ovrMaxProvidedFrameStats". On the Oculus Rift CV1 HMD, this will be equal to 18 times per second.
The performance entries will be ordered in reverse chronological order such that the first entry will be the most recent one.
int ovrPerfStats::FrameStatsCount ( )
ovrBool ovrPerfStats::AnyFrameStatsDropped ( )
If the app calls ovr_GetPerfStats at less than 18 fps for CV1, then AnyFrameStatsDropped will be ovrTrue and FrameStatsCount will be equal to ovrMaxProvidedFrameStats.
float ovrPerfStats::AdaptiveGpuPerformanceScale ( )
AdaptiveGpuPerformanceScale is an edge-filtered value that a caller can use to adjust the graphics quality of the application to keep the GPU utilization in check.
The value is calculated as: (desired_GPU_utilization / current_GPU_utilization) As such, when this value is 1.0, the GPU is doing the right amount of work for the app. Lower values mean the app needs to pull back on the GPU utilization. If the app is going to directly drive render-target resolution using this value, then be sure to take the square-root of the value before scaling the resolution with it. Changing render target resolutions however is one of the many things an app can do increase or decrease the amount of GPU utilization. Since AdaptiveGpuPerformanceScale is edge-filtered and does not change rapidly (i.e. reports non-1.0 values once every couple of seconds) the app can make the necessary adjustments and then keep watching the value to see if it has been satisfied.
ovrBool ovrPerfStats::AswIsAvailable ( )
Will be true if Async Spacewarp (ASW) is available for this system which is dependent on several factors such as choice of GPU, OS and debug overrides.
ovrProcessId ovrPerfStats::VisibleProcessId ( )
Contains the Process ID of the VR application the stats are being polled for If an app continues to grab perf stats even when it is not visible, then expect this value to point to the other VR app that has grabbed focus (i.e.
became visible)
The documentation for this struct was generated from the following file: Include/OVR_CAPI.h