Fix WASAPI haptic playback truncating clips when endpoint sample rate differs from source

[tomaabe]

Summary

Fixes Advanced Haptics WASAPI playback for WAV files when the haptic audio endpoint sample rate is not an integer multiple of the source WAV sample rate. The previous resampling loop could under/overproduce destination frames and silently drop the tail of longer clips. This change also fixes RenderBuffer leaks in the sample queue cleanup paths.

Repro steps

1. Build the Advanced Haptics sample.
2. Connect a controller whose haptic audio endpoint sample rate differs from 48 kHz.
3. Select a multi-second WAV clip, such as an 8-beat 48 kHz clip.
4. Press Play WASAPI (L1).
   • Before this fix: only the beginning plays/vibrates, for example only the first beat.
5. Press Play XAudio2 (R1).
   • XAudio2 playback works because XAudio2 performs resampling natively.

Root cause

WaveSampleGenerator::GenerateSampleBuffer computed sampleRatio as a float, but used it as the upper bound of an integer loop:

for (unsigned int j = 0; j < sampleRatio; j++)
{
    writer.WriteBlock(channelData, nMaxChannels);
}

For non-integer ratios, this writes a whole-integer number of destination blocks per source block. As a result, the pre-sized render buffers can be exhausted before all source frames are consumed, silently truncating the tail of longer clips.

Fix

• Replaced the integer-loop resampler with a phase-accumulator nearest-neighbor resampler.
  • The source position advances by exactly 1 / sampleRatio source frames per destination frame.
  • Fractional ratios and downsampling are handled correctly.
• Fixed RenderBuffer ownership cleanup:
  • FillSampleBuffer now deletes each consumed RenderBuffer.
  • Flush now deletes all remaining queued RenderBuffer objects and restores the queue tail pointer.

Testing

• Built Debug|x64 with Visual Studio.
• Verified an 8-beat 48 kHz clip now plays fully through both Play WASAPI (L1) and Play XAudio2 (R1).

Notes

• Nearest-neighbor resampling is consistent with the intent and complexity level of this sample.
• No public API changes.
• Single-file change in Samples/System/Haptics/HapticsManager/Audio/WaveSampleGenerator.cpp.

[BrianPeekMSFT]

Fixed internally, will be in the next github publish.