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prepend bitstream packets with a V

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This commit is contained in:
Stephen Birarda 2013-03-15 14:33:45 -07:00
parent 970daa511d
commit 2c0565e358
1 changed files with 38 additions and 6 deletions
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44
shared/src/VoxelTree.cpp
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@ -6,6 +6,7 @@
// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
//
#include "OctalCode.h"
#include "VoxelTree.h"
const int MAX_TREE_SLICE_BYTES = 26;
@ -21,14 +22,44 @@ char * VoxelTree::loadBitstream(char * bitstreamBuffer,
if (bitstreamRootNode->childMask != 0) {
if ((bitstreamBuffer + MAX_TREE_SLICE_BYTES - *packetSplitPtr) > MAX_VOXEL_PACKET_SIZE) {
if (bitstreamRootNode == rootNode || (bitstreamBuffer + MAX_TREE_SLICE_BYTES - *packetSplitPtr) > MAX_VOXEL_PACKET_SIZE) {
// we need to add a packet split here
// add the octal code for the current root
// increment packetSplitPtr and set the pointer it points to
// to the beginning of the next tree section
*(++packetSplitPtr) = bitstreamBuffer;
if (bitstreamRootNode == rootNode) {
// set the packetSplitPtr and increment bitstream buffer by 1 for leading V
*packetSplitPtr = bitstreamBuffer;
// lead packet with a V
*(bitstreamBuffer++) = 'V';
// root node octal code length byte is 0
*(bitstreamBuffer++) = 0;
} else {
// increment packetSplitPtr and set the pointer it points to
// to the beginning of this tree section
// bistreamBuffer is incremented for leading V
*(++packetSplitPtr) = bitstreamBuffer;
// lead packet with a V
*(bitstreamBuffer++) = 'V';
// add the octal code for the current root
int bytesForOctalCode = bytesRequiredForCodeLength(*bitstreamRootNode->octalCode);
memcpy(bitstreamBuffer, bitstreamRootNode->octalCode, bytesForOctalCode);
// push the bitstreamBuffer forwards by the number of bytes used for the octal code
bitstreamBuffer += bytesForOctalCode;
}
// set the color bit for this node
*(bitstreamBuffer++) = (int)(bitstreamRootNode->color[3] != 0);
// copy this node's color into the bitstreamBuffer, if required
if (bitstreamRootNode->color[3] != 0) {
memcpy(bitstreamBuffer, bitstreamRootNode->color, 3);
bitstreamBuffer += 3;
}
}
// default color mask is 0, increment pointer for colors
@ -55,7 +86,8 @@ char * VoxelTree::loadBitstream(char * bitstreamBuffer,
// push the bitstreamBuffer forwards for the number of added colors
bitstreamBuffer += (colorPointer - bitstreamBuffer);
// copy the childMask to the current position of the bitstreamBuffer, and increment it
// copy the childMask to the current position of the bitstreamBuffer
// and push the buffer pointer forwards
*(bitstreamBuffer++) = bitstreamRootNode->childMask;
for (int j = 0; j < 8; j++) {