374 lines
11 KiB
C#
374 lines
11 KiB
C#
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using UnityEngine;
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using System;
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using System.IO;
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using System.Collections;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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/// <summary>
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/// Plays tactile effects on a tracked VR controller.
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/// </summary>
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public static class OVRHaptics
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{
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public readonly static OVRHapticsChannel[] Channels;
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public readonly static OVRHapticsChannel LeftChannel;
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public readonly static OVRHapticsChannel RightChannel;
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private readonly static OVRHapticsOutput[] m_outputs;
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static OVRHaptics()
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{
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Config.Load();
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m_outputs = new OVRHapticsOutput[]
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{
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new OVRHapticsOutput((uint)OVRPlugin.Controller.LTouch),
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new OVRHapticsOutput((uint)OVRPlugin.Controller.RTouch),
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};
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Channels = new OVRHapticsChannel[]
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{
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LeftChannel = new OVRHapticsChannel(0),
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RightChannel = new OVRHapticsChannel(1),
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};
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}
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/// <summary>
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/// Determines the target format for haptics data on a specific device.
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/// </summary>
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public static class Config
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{
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public static int SampleRateHz { get; private set; }
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public static int SampleSizeInBytes { get; private set; }
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public static int MinimumSafeSamplesQueued { get; private set; }
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public static int MinimumBufferSamplesCount { get; private set; }
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public static int OptimalBufferSamplesCount { get; private set; }
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public static int MaximumBufferSamplesCount { get; private set; }
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static Config()
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{
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Load();
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}
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public static void Load()
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{
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OVRPlugin.HapticsDesc desc = OVRPlugin.GetControllerHapticsDesc((uint)OVRPlugin.Controller.RTouch);
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SampleRateHz = desc.SampleRateHz;
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SampleSizeInBytes = desc.SampleSizeInBytes;
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MinimumSafeSamplesQueued = desc.MinimumSafeSamplesQueued;
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MinimumBufferSamplesCount = desc.MinimumBufferSamplesCount;
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OptimalBufferSamplesCount = desc.OptimalBufferSamplesCount;
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MaximumBufferSamplesCount = desc.MaximumBufferSamplesCount;
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}
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}
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/// <summary>
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/// A track of haptics data that can be mixed or sequenced with another track.
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/// </summary>
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public class OVRHapticsChannel
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{
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private OVRHapticsOutput m_output;
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/// <summary>
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/// Constructs a channel targeting the specified output.
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/// </summary>
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public OVRHapticsChannel(uint outputIndex)
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{
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m_output = m_outputs[outputIndex];
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}
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/// <summary>
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/// Cancels any currently-playing clips and immediatly plays the specified clip instead.
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/// </summary>
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public void Preempt(OVRHapticsClip clip)
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{
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m_output.Preempt(clip);
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}
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/// <summary>
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/// Enqueues the specified clip to play after any currently-playing clips finish.
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/// </summary>
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public void Queue(OVRHapticsClip clip)
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{
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m_output.Queue(clip);
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}
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/// <summary>
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/// Adds the specified clip to play simultaneously to the currently-playing clip(s).
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/// </summary>
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public void Mix(OVRHapticsClip clip)
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{
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m_output.Mix(clip);
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}
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/// <summary>
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/// Cancels any currently-playing clips.
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/// </summary>
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public void Clear()
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{
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m_output.Clear();
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}
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}
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private class OVRHapticsOutput
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{
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private class ClipPlaybackTracker
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{
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public int ReadCount { get; set; }
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public OVRHapticsClip Clip { get; set; }
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public ClipPlaybackTracker(OVRHapticsClip clip)
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{
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Clip = clip;
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}
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}
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private bool m_lowLatencyMode = true;
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private bool m_paddingEnabled = true;
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private int m_prevSamplesQueued = 0;
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private float m_prevSamplesQueuedTime = 0;
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private int m_numPredictionHits = 0;
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private int m_numPredictionMisses = 0;
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private int m_numUnderruns = 0;
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private List<ClipPlaybackTracker> m_pendingClips = new List<ClipPlaybackTracker>();
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private uint m_controller = 0;
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private OVRNativeBuffer m_nativeBuffer = new OVRNativeBuffer(OVRHaptics.Config.MaximumBufferSamplesCount * OVRHaptics.Config.SampleSizeInBytes);
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private OVRHapticsClip m_paddingClip = new OVRHapticsClip();
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public OVRHapticsOutput(uint controller)
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{
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#if UNITY_ANDROID
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m_paddingEnabled = false;
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#endif
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m_controller = controller;
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}
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/// <summary>
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/// The system calls this each frame to update haptics playback.
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/// </summary>
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public void Process()
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{
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var hapticsState = OVRPlugin.GetControllerHapticsState(m_controller);
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float elapsedTime = Time.realtimeSinceStartup - m_prevSamplesQueuedTime;
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if (m_prevSamplesQueued > 0)
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{
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int expectedSamples = m_prevSamplesQueued - (int)(elapsedTime * OVRHaptics.Config.SampleRateHz + 0.5f);
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if (expectedSamples < 0)
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expectedSamples = 0;
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if ((hapticsState.SamplesQueued - expectedSamples) == 0)
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m_numPredictionHits++;
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else
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m_numPredictionMisses++;
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//Debug.Log(hapticsState.SamplesAvailable + "a " + hapticsState.SamplesQueued + "q " + expectedSamples + "e "
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//+ "Prediction Accuracy: " + m_numPredictionHits / (float)(m_numPredictionMisses + m_numPredictionHits));
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if ((expectedSamples > 0) && (hapticsState.SamplesQueued == 0))
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{
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m_numUnderruns++;
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//Debug.LogError("Samples Underrun (" + m_controller + " #" + m_numUnderruns + ") -"
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// + " Expected: " + expectedSamples
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// + " Actual: " + hapticsState.SamplesQueued);
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}
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m_prevSamplesQueued = hapticsState.SamplesQueued;
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m_prevSamplesQueuedTime = Time.realtimeSinceStartup;
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}
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int desiredSamplesCount = OVRHaptics.Config.OptimalBufferSamplesCount;
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if (m_lowLatencyMode)
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{
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float sampleRateMs = 1000.0f / (float)OVRHaptics.Config.SampleRateHz;
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float elapsedMs = elapsedTime * 1000.0f;
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int samplesNeededPerFrame = (int)Mathf.Ceil(elapsedMs / sampleRateMs);
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int lowLatencySamplesCount = OVRHaptics.Config.MinimumSafeSamplesQueued + samplesNeededPerFrame;
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if (lowLatencySamplesCount < desiredSamplesCount)
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desiredSamplesCount = lowLatencySamplesCount;
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}
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if (hapticsState.SamplesQueued > desiredSamplesCount)
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return;
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if (desiredSamplesCount > OVRHaptics.Config.MaximumBufferSamplesCount)
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desiredSamplesCount = OVRHaptics.Config.MaximumBufferSamplesCount;
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if (desiredSamplesCount > hapticsState.SamplesAvailable)
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desiredSamplesCount = hapticsState.SamplesAvailable;
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int acquiredSamplesCount = 0;
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int clipIndex = 0;
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while(acquiredSamplesCount < desiredSamplesCount && clipIndex < m_pendingClips.Count)
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{
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int numSamplesToCopy = desiredSamplesCount - acquiredSamplesCount;
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int remainingSamplesInClip = m_pendingClips[clipIndex].Clip.Count - m_pendingClips[clipIndex].ReadCount;
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if (numSamplesToCopy > remainingSamplesInClip)
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numSamplesToCopy = remainingSamplesInClip;
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if (numSamplesToCopy > 0)
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{
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int numBytes = numSamplesToCopy * OVRHaptics.Config.SampleSizeInBytes;
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int dstOffset = acquiredSamplesCount * OVRHaptics.Config.SampleSizeInBytes;
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int srcOffset = m_pendingClips[clipIndex].ReadCount * OVRHaptics.Config.SampleSizeInBytes;
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Marshal.Copy(m_pendingClips[clipIndex].Clip.Samples, srcOffset, m_nativeBuffer.GetPointer(dstOffset), numBytes);
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m_pendingClips[clipIndex].ReadCount += numSamplesToCopy;
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acquiredSamplesCount += numSamplesToCopy;
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}
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clipIndex++;
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}
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for (int i = m_pendingClips.Count - 1; i >= 0 && m_pendingClips.Count > 0; i--)
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{
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if (m_pendingClips[i].ReadCount >= m_pendingClips[i].Clip.Count)
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m_pendingClips.RemoveAt(i);
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}
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if (m_paddingEnabled)
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{
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int desiredPadding = desiredSamplesCount - (hapticsState.SamplesQueued + acquiredSamplesCount);
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if (desiredPadding < (OVRHaptics.Config.MinimumBufferSamplesCount - acquiredSamplesCount))
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desiredPadding = (OVRHaptics.Config.MinimumBufferSamplesCount - acquiredSamplesCount);
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if (desiredPadding > hapticsState.SamplesAvailable)
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desiredPadding = hapticsState.SamplesAvailable;
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if (desiredPadding > 0)
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{
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int numBytes = desiredPadding * OVRHaptics.Config.SampleSizeInBytes;
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int dstOffset = acquiredSamplesCount * OVRHaptics.Config.SampleSizeInBytes;
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int srcOffset = 0;
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Marshal.Copy(m_paddingClip.Samples, srcOffset, m_nativeBuffer.GetPointer(dstOffset), numBytes);
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acquiredSamplesCount += desiredPadding;
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}
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}
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if (acquiredSamplesCount > 0)
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{
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OVRPlugin.HapticsBuffer hapticsBuffer;
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hapticsBuffer.Samples = m_nativeBuffer.GetPointer();
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hapticsBuffer.SamplesCount = acquiredSamplesCount;
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OVRPlugin.SetControllerHaptics(m_controller, hapticsBuffer);
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hapticsState = OVRPlugin.GetControllerHapticsState(m_controller);
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m_prevSamplesQueued = hapticsState.SamplesQueued;
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m_prevSamplesQueuedTime = Time.realtimeSinceStartup;
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}
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}
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/// <summary>
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/// Immediately plays the specified clip without waiting for any currently-playing clip to finish.
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/// </summary>
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public void Preempt(OVRHapticsClip clip)
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{
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m_pendingClips.Clear();
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m_pendingClips.Add(new ClipPlaybackTracker(clip));
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}
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/// <summary>
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/// Enqueues the specified clip to play after any currently-playing clip finishes.
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/// </summary>
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public void Queue(OVRHapticsClip clip)
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{
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m_pendingClips.Add(new ClipPlaybackTracker(clip));
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}
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/// <summary>
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/// Adds the samples from the specified clip to the ones in the currently-playing clip(s).
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/// </summary>
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public void Mix(OVRHapticsClip clip)
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{
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int numClipsToMix = 0;
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int numSamplesToMix = 0;
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int numSamplesRemaining = clip.Count;
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while (numSamplesRemaining > 0 && numClipsToMix < m_pendingClips.Count)
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{
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int numSamplesRemainingInClip = m_pendingClips[numClipsToMix].Clip.Count - m_pendingClips[numClipsToMix].ReadCount;
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numSamplesRemaining -= numSamplesRemainingInClip;
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numSamplesToMix += numSamplesRemainingInClip;
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numClipsToMix++;
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}
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if (numSamplesRemaining > 0)
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{
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numSamplesToMix += numSamplesRemaining;
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numSamplesRemaining = 0;
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}
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if (numClipsToMix > 0)
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{
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OVRHapticsClip mixClip = new OVRHapticsClip(numSamplesToMix);
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OVRHapticsClip a = clip;
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int aReadCount = 0;
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for (int i = 0; i < numClipsToMix; i++)
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{
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OVRHapticsClip b = m_pendingClips[i].Clip;
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for(int bReadCount = m_pendingClips[i].ReadCount; bReadCount < b.Count; bReadCount++)
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{
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if (OVRHaptics.Config.SampleSizeInBytes == 1)
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{
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byte sample = 0; // TODO support multi-byte samples
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if ((aReadCount < a.Count) && (bReadCount < b.Count))
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{
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sample = (byte)(Mathf.Clamp(a.Samples[aReadCount] + b.Samples[bReadCount], 0, System.Byte.MaxValue)); // TODO support multi-byte samples
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aReadCount++;
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}
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else if (bReadCount < b.Count)
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{
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sample = b.Samples[bReadCount]; // TODO support multi-byte samples
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}
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mixClip.WriteSample(sample); // TODO support multi-byte samples
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}
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}
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}
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while (aReadCount < a.Count)
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{
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if (OVRHaptics.Config.SampleSizeInBytes == 1)
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{
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mixClip.WriteSample(a.Samples[aReadCount]); // TODO support multi-byte samples
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}
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aReadCount++;
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}
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m_pendingClips[0] = new ClipPlaybackTracker(mixClip);
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for (int i = 1; i < numClipsToMix; i++)
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{
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m_pendingClips.RemoveAt(1);
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}
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}
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else
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{
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m_pendingClips.Add(new ClipPlaybackTracker(clip));
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}
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}
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public void Clear()
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{
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m_pendingClips.Clear();
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}
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}
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/// <summary>
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/// The system calls this each frame to update haptics playback.
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/// </summary>
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public static void Process()
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{
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Config.Load();
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for (int i = 0; i < m_outputs.Length; i++)
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{
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m_outputs[i].Process();
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}
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}
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}
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