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Work on bitwise optimisations.

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This commit is contained in:
David Williams 2008-06-07 18:47:14 +00:00
parent c6ef094e95
commit 90fb658238
1 changed files with 24 additions and 3 deletions
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27
source/SurfaceExtractors.cpp
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@ -208,15 +208,36 @@ namespace PolyVox
const uint8_t v011 = volIter.peekVoxel0px1py1pz();
const uint8_t v111 = volIter.peekVoxel1px1py1pz();
uint8_t iPreviousCubeIndex = previousBitmask[getIndex(x,y)];
iCubeIndex = iPreviousCubeIndex >> 4;
uint8_t iPreviousCubeIndexZ = previousBitmask[getIndex(x,y)];
iCubeIndex = iPreviousCubeIndexZ >> 4;
if (v001 == 0) iCubeIndex |= 16;
if (v101 == 0) iCubeIndex |= 32;
if (v111 == 0) iCubeIndex |= 64;
if (v011 == 0) iCubeIndex |= 128;
}
else if(y==0)
else if((x>0) && y==0)
{
//Voxels values
const uint8_t v101 = volIter.peekVoxel1px0py1pz();
const uint8_t v111 = volIter.peekVoxel1px1py1pz();
uint8_t iPreviousCubeIndexZ = previousBitmask[getIndex(x,y)];
iCubeIndex = iPreviousCubeIndexZ >> 4;
uint8_t iPreviousCubeIndexX = bitmask[getIndex(x-1,y)];
uint8_t bit6 = iPreviousCubeIndexX & 64;
uint8_t bit7 = bit6 << 1;
uint8_t bit5 = iPreviousCubeIndexX & 32;
uint8_t bit4 = bit5 >> 1;
iCubeIndex |= bit4;
if (v101 == 0) iCubeIndex |= 32;
if (v111 == 0) iCubeIndex |= 64;
iCubeIndex |= bit7;
}
else if((x==0) && (y>0))
{
//Voxels values
const uint8_t v001 = volIter.peekVoxel0px0py1pz();