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Avatar Mixer Protocol: Normalize translation before compression

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This commit is contained in:
Anthony Thibault 2019-01-15 18:56:09 -08:00
parent a115af6353
commit 104084d811
2 changed files with 30 additions and 9 deletions
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36
libraries/avatars/src/AvatarData.cpp
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@ -677,7 +677,6 @@ QByteArray AvatarData::toByteArray(AvatarDataDetail dataDetail, quint64 lastSent
validityPosition = destinationBuffer;
#ifdef WANT_DEBUG
int translationSentCount = 0;
unsigned char* beforeTranslations = destinationBuffer;
#endif
@ -686,7 +685,13 @@ QByteArray AvatarData::toByteArray(AvatarDataDetail dataDetail, quint64 lastSent
float minTranslation = (distanceAdjust && cullSmallChanges) ? getDistanceBasedMinTranslationDistance(viewerPosition) : AVATAR_MIN_TRANSLATION;
float maxTranslationDimension = 0.0;
float maxTranslationDimension = 0.0f;
const int MAX_NUM_JOINTS = 256;
assert(numJoints < MAX_NUM_JOINTS);
glm::vec3 translationsSentArray[MAX_NUM_JOINTS]; // 3060 bytes allocated on the stack for performance.
int translationsSent = 0;
i = sendStatus.translationsSent;
for (; i < numJoints; ++i) {
const JointData& data = joints[i];
@ -697,15 +702,11 @@ QByteArray AvatarData::toByteArray(AvatarDataDetail dataDetail, quint64 lastSent
if (sendAll || last.translationIsDefaultPose || (!cullSmallChanges && last.translation != data.translation)
|| (cullSmallChanges && glm::distance(data.translation, lastSentJointData[i].translation) > minTranslation)) {
validityPosition[i / BITS_IN_BYTE] |= 1 << (i % BITS_IN_BYTE);
#ifdef WANT_DEBUG
translationSentCount++;
#endif
maxTranslationDimension = glm::max(fabsf(data.translation.x), maxTranslationDimension);
maxTranslationDimension = glm::max(fabsf(data.translation.y), maxTranslationDimension);
maxTranslationDimension = glm::max(fabsf(data.translation.z), maxTranslationDimension);
destinationBuffer +=
packFloatVec3ToSignedTwoByteFixed(destinationBuffer, data.translation, TRANSLATION_COMPRESSION_RADIX);
translationsSentArray[translationsSent++] = data.translation;
if (sentJoints) {
sentJoints[i].translation = data.translation;
@ -721,6 +722,16 @@ QByteArray AvatarData::toByteArray(AvatarDataDetail dataDetail, quint64 lastSent
}
}
// AJT: TODO make sure size computation is properly up to date!
// Write maxTranslationDimension into packet
memcpy(destinationBuffer, &maxTranslationDimension, sizeof(float));
destinationBuffer += sizeof(float);
// Write normalized and compressed translations into packet
for (i = 0; i < translationsSent; ++i) {
destinationBuffer += packFloatVec3ToSignedTwoByteFixed(destinationBuffer, translationsSentArray[i] / maxTranslationDimension, TRANSLATION_COMPRESSION_RADIX);
}
sendStatus.translationsSent = i;
// faux joints
@ -766,7 +777,7 @@ QByteArray AvatarData::toByteArray(AvatarDataDetail dataDetail, quint64 lastSent
#ifdef WANT_DEBUG
if (sendAll) {
qCDebug(avatars) << "AvatarData::toByteArray" << cullSmallChanges << sendAll
<< "rotations:" << rotationSentCount << "translations:" << translationSentCount
<< "rotations:" << rotationSentCount << "translations:" << translationsSentCount
<< "largest:" << maxTranslationDimension
<< "size:"
<< (beforeRotations - startPosition) << "+"
@ -1280,6 +1291,13 @@ int AvatarData::parseDataFromBuffer(const QByteArray& buffer) {
}
} // 1 + bytesOfValidity bytes
// AJT: read maxTranslationDimension
float maxTranslationDimension;
PACKET_READ_CHECK(MaxTranslationDimension, sizeof(float));
memcpy(&maxTranslationDimension, sourceBuffer, sizeof(float));
sourceBuffer += sizeof(float);
// each joint translation component is stored in 6 bytes.
const int COMPRESSED_TRANSLATION_SIZE = 6;
PACKET_READ_CHECK(JointTranslation, numValidJointTranslations * COMPRESSED_TRANSLATION_SIZE);
@ -1288,6 +1306,8 @@ int AvatarData::parseDataFromBuffer(const QByteArray& buffer) {
JointData& data = _jointData[i];
if (validTranslations[i]) {
sourceBuffer += unpackFloatVec3FromSignedTwoByteFixed(sourceBuffer, data.translation, TRANSLATION_COMPRESSION_RADIX);
// un-normalize translation
data.translation *= maxTranslationDimension;
_hasNewJointData = true;
data.translationIsDefaultPose = false;
}

3
libraries/avatars/src/AvatarData.h
View file

@ -277,7 +277,8 @@ namespace AvatarDataPacket {
uint8_t rotationValidityBits[ceil(numJoints / 8)]; // one bit per joint, if true then a compressed rotation follows.
SixByteQuat rotation[numValidRotations]; // encodeded and compressed by packOrientationQuatToSixBytes()
uint8_t translationValidityBits[ceil(numJoints / 8)]; // one bit per joint, if true then a compressed translation follows.
SixByteTrans translation[numValidTranslations]; // encodeded and compressed by packFloatVec3ToSignedTwoByteFixed()
float maxTranslationDimension; // used to normalize fixed point translation values.
SixByteTrans translation[numValidTranslations]; // normalized and compressed by packFloatVec3ToSignedTwoByteFixed()
SixByteQuat leftHandControllerRotation;
SixByteTrans leftHandControllerTranslation;