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Merge pull request #2998 from birarda/master

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remove MMX math in stereo audio copy
This commit is contained in:
Stephen Birarda 2014-06-06 12:02:21 -07:00
commit 570b66b310
1 changed files with 8 additions and 15 deletions
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23
assignment-client/src/audio/AudioMixer.cpp
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@ -310,21 +310,14 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
// stereo buffer - do attenuation but no sample delay for spatialization
for (int s = 0; s < NETWORK_BUFFER_LENGTH_SAMPLES_STEREO; s += 4) {
// use MMX to clamp four additions at a time
__m64 bufferSamples = _mm_set_pi16(_clientSamples[s], _clientSamples[s + 1],
_clientSamples[s + 2], _clientSamples[s + 3]);
__m64 addSamples = _mm_set_pi16(nextOutputStart[s] * attenuationCoefficient,
nextOutputStart[s + 1] * attenuationCoefficient,
nextOutputStart[s + 2] * attenuationCoefficient,
nextOutputStart[s + 3] * attenuationCoefficient);
__m64 mmxResult = _mm_adds_pi16(bufferSamples, addSamples);
int16_t* shortResults = reinterpret_cast<int16_t*>(&mmxResult);
_clientSamples[s] = shortResults[3];
_clientSamples[s + 1] = shortResults[2];
_clientSamples[s + 2] = shortResults[1];
_clientSamples[s + 3] = shortResults[0];
_clientSamples[s] = glm::clamp(_clientSamples[s] + (int) (nextOutputStart[s] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 1] = glm::clamp(_clientSamples[s + 1] + (int) (nextOutputStart[s + 1] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 2] = glm::clamp(_clientSamples[s + 2] + (int) (nextOutputStart[s + 2] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 3] = glm::clamp(_clientSamples[s + 3] + (int) (nextOutputStart[s + 3] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
}
}
}