/// <summary>
/// The system calls this each frame to update haptics playback.
/// </summary>
public void Process()
{
var hapticsState = OVRPlugin.GetControllerHapticsState(m_controller);
float elapsedTime = Time.realtimeSinceStartup - m_prevSamplesQueuedTime;
if (m_prevSamplesQueued > 0)
{
int expectedSamples = m_prevSamplesQueued - (int)(elapsedTime * OVRHaptics.Config.SampleRateHz + 0.5f);
if (expectedSamples < 0)
{
expectedSamples = 0;
}
if ((hapticsState.SamplesQueued - expectedSamples) == 0)
{
m_numPredictionHits++;
}
else
{
m_numPredictionMisses++;
}
//Debug.Log(hapticsState.SamplesAvailable + "a " + hapticsState.SamplesQueued + "q " + expectedSamples + "e "
//+ "Prediction Accuracy: " + m_numPredictionHits / (float)(m_numPredictionMisses + m_numPredictionHits));
if ((expectedSamples > 0) && (hapticsState.SamplesQueued == 0))
{
m_numUnderruns++;
//Debug.LogError("Samples Underrun (" + m_controller + " #" + m_numUnderruns + ") -"
// + " Expected: " + expectedSamples
// + " Actual: " + hapticsState.SamplesQueued);
}
m_prevSamplesQueued = hapticsState.SamplesQueued;
m_prevSamplesQueuedTime = Time.realtimeSinceStartup;
}
int desiredSamplesCount = OVRHaptics.Config.OptimalBufferSamplesCount;
if (m_lowLatencyMode)
{
float sampleRateMs = 1000.0f / (float)OVRHaptics.Config.SampleRateHz;
float elapsedMs = elapsedTime * 1000.0f;
int samplesNeededPerFrame = (int)Mathf.Ceil(elapsedMs / sampleRateMs);
int lowLatencySamplesCount = OVRHaptics.Config.MinimumSafeSamplesQueued + samplesNeededPerFrame;
if (lowLatencySamplesCount < desiredSamplesCount)
{
desiredSamplesCount = lowLatencySamplesCount;
}
}
if (hapticsState.SamplesQueued > desiredSamplesCount)
{
return;
}
if (desiredSamplesCount > OVRHaptics.Config.MaximumBufferSamplesCount)
{
desiredSamplesCount = OVRHaptics.Config.MaximumBufferSamplesCount;
}
if (desiredSamplesCount > hapticsState.SamplesAvailable)
{
desiredSamplesCount = hapticsState.SamplesAvailable;
}
int acquiredSamplesCount = 0;
int clipIndex = 0;
while (acquiredSamplesCount < desiredSamplesCount && clipIndex < m_pendingClips.Count)
{
int numSamplesToCopy = desiredSamplesCount - acquiredSamplesCount;
int remainingSamplesInClip = m_pendingClips[clipIndex].Clip.Count - m_pendingClips[clipIndex].ReadCount;
if (numSamplesToCopy > remainingSamplesInClip)
{
numSamplesToCopy = remainingSamplesInClip;
}
if (numSamplesToCopy > 0)
{
int numBytes = numSamplesToCopy * OVRHaptics.Config.SampleSizeInBytes;
int dstOffset = acquiredSamplesCount * OVRHaptics.Config.SampleSizeInBytes;
int srcOffset = m_pendingClips[clipIndex].ReadCount * OVRHaptics.Config.SampleSizeInBytes;
Marshal.Copy(m_pendingClips[clipIndex].Clip.Samples, srcOffset, m_nativeBuffer.GetPointer(dstOffset), numBytes);
m_pendingClips[clipIndex].ReadCount += numSamplesToCopy;
acquiredSamplesCount += numSamplesToCopy;
}
clipIndex++;
}
for (int i = m_pendingClips.Count - 1; i >= 0 && m_pendingClips.Count > 0; i--)
{
if (m_pendingClips[i].ReadCount >= m_pendingClips[i].Clip.Count)
{
m_pendingClips.RemoveAt(i);
}
}
int desiredPadding = desiredSamplesCount - (hapticsState.SamplesQueued + acquiredSamplesCount);
if (desiredPadding < (OVRHaptics.Config.MinimumBufferSamplesCount - acquiredSamplesCount))
{
desiredPadding = (OVRHaptics.Config.MinimumBufferSamplesCount - acquiredSamplesCount);
}
if (desiredPadding > hapticsState.SamplesAvailable)
{
desiredPadding = hapticsState.SamplesAvailable;
}
if (desiredPadding > 0)
{
int numBytes = desiredPadding * OVRHaptics.Config.SampleSizeInBytes;
int dstOffset = acquiredSamplesCount * OVRHaptics.Config.SampleSizeInBytes;
int srcOffset = 0;
Marshal.Copy(m_paddingClip.Samples, srcOffset, m_nativeBuffer.GetPointer(dstOffset), numBytes);
acquiredSamplesCount += desiredPadding;
}
if (acquiredSamplesCount > 0)
{
OVRPlugin.HapticsBuffer hapticsBuffer;
hapticsBuffer.Samples = m_nativeBuffer.GetPointer();
hapticsBuffer.SamplesCount = acquiredSamplesCount;
OVRPlugin.SetControllerHaptics(m_controller, hapticsBuffer);
hapticsState = OVRPlugin.GetControllerHapticsState(m_controller);
m_prevSamplesQueued = hapticsState.SamplesQueued;
m_prevSamplesQueuedTime = Time.realtimeSinceStartup;
}
}