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/**
* @file llvolumeoctree.cpp
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llvolumeoctree.h"
#include "llvector4a.h"
bool LLLineSegmentBoxIntersect(const LLVector4a& start, const LLVector4a& end, const LLVector4a& center, const LLVector4a& size)
{
LLVector4a fAWdU;
LLVector4a dir;
LLVector4a diff;
dir.setSub(end, start);
dir.mul(0.5f);
diff.setAdd(end,start);
diff.mul(0.5f);
diff.sub(center);
fAWdU.setAbs(dir);
LLVector4a rhs;
rhs.setAdd(size, fAWdU);
LLVector4a lhs;
lhs.setAbs(diff);
U32 grt = lhs.greaterThan(rhs).getGatheredBits();
if (grt & 0x7)
{
return false;
}
LLVector4a f;
f.setCross3(dir, diff);
f.setAbs(f);
LLVector4a v0, v1;
v0 = _mm_shuffle_ps(size, size,_MM_SHUFFLE(3,0,0,1));
v1 = _mm_shuffle_ps(fAWdU, fAWdU, _MM_SHUFFLE(3,1,2,2));
lhs.setMul(v0, v1);
v0 = _mm_shuffle_ps(size, size, _MM_SHUFFLE(3,1,2,2));
v1 = _mm_shuffle_ps(fAWdU, fAWdU, _MM_SHUFFLE(3,0,0,1));
rhs.setMul(v0, v1);
rhs.add(lhs);
grt = f.greaterThan(rhs).getGatheredBits();
return (grt & 0x7) == 0;
}
LLVolumeOctreeListener::LLVolumeOctreeListener(LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* node)
{
node->addListener(this);
}
LLVolumeOctreeListener::~LLVolumeOctreeListener()
{
}
void LLVolumeOctreeListener::handleChildAddition(const LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* parent,
LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* child)
{
new LLVolumeOctreeListener(child);
}
LLOctreeTriangleRayIntersect::LLOctreeTriangleRayIntersect(const LLVector4a& start, const LLVector4a& dir,
const LLVolumeFace* face, F32* closest_t,
LLVector4a* intersection,LLVector2* tex_coord, LLVector4a* normal, LLVector4a* tangent)
: mFace(face),
mStart(start),
mDir(dir),
mIntersection(intersection),
mTexCoord(tex_coord),
mNormal(normal),
mTangent(tangent),
mClosestT(closest_t),
mHitFace(false)
{
mEnd.setAdd(mStart, mDir);
}
void LLOctreeTriangleRayIntersect::traverse(const LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* node)
{
LLVolumeOctreeListener* vl = (LLVolumeOctreeListener*) node->getListener(0);
if (LLLineSegmentBoxIntersect(mStart, mEnd, vl->mBounds[0], vl->mBounds[1]))
{
node->accept(this);
for (U32 i = 0; i < node->getChildCount(); ++i)
{
traverse(node->getChild(i));
}
}
}
void LLOctreeTriangleRayIntersect::visit(const LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* node)
{
for (typename LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>::const_element_iter iter =
node->getDataBegin(); iter != node->getDataEnd(); ++iter)
{
const LLVolumeTriangle* tri = *iter;
F32 a, b, t;
if (LLTriangleRayIntersect(*tri->mV[0], *tri->mV[1], *tri->mV[2],
mStart, mDir, a, b, t))
{
if ((t >= 0.f) && // if hit is after start
(t <= 1.f) && // and before end
(t < *mClosestT)) // and this hit is closer
{
*mClosestT = t;
mHitFace = true;
if (mIntersection != NULL)
{
LLVector4a intersect = mDir;
intersect.mul(*mClosestT);
intersect.add(mStart);
*mIntersection = intersect;
}
U32 idx0 = tri->mIndex[0];
U32 idx1 = tri->mIndex[1];
U32 idx2 = tri->mIndex[2];
if (mTexCoord != NULL)
{
LLVector2* tc = (LLVector2*) mFace->mTexCoords;
*mTexCoord = ((1.f - a - b) * tc[idx0] +
a * tc[idx1] +
b * tc[idx2]);
}
if (mNormal != NULL)
{
LLVector4a* norm = mFace->mNormals;
LLVector4a n1,n2,n3;
n1 = norm[idx0];
n1.mul(1.f-a-b);
n2 = norm[idx1];
n2.mul(a);
n3 = norm[idx2];
n3.mul(b);
n1.add(n2);
n1.add(n3);
*mNormal = n1;
}
if (mTangent != NULL)
{
LLVector4a* tangents = mFace->mTangents;
LLVector4a t1,t2,t3;
t1 = tangents[idx0];
t1.mul(1.f-a-b);
t2 = tangents[idx1];
t2.mul(a);
t3 = tangents[idx2];
t3.mul(b);
t1.add(t2);
t1.add(t3);
*mTangent = t1;
}
}
}
}
}
const LLVector4a& LLVolumeTriangle::getPositionGroup() const
{
return mPositionGroup;
}
const F32& LLVolumeTriangle::getBinRadius() const
{
return mRadius;
}
//TEST CODE
void LLVolumeOctreeValidate::visit(const LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* branch)
{
LLVolumeOctreeListener* node = (LLVolumeOctreeListener*) branch->getListener(0);
//make sure bounds matches extents
LLVector4a& min = node->mExtents[0];
LLVector4a& max = node->mExtents[1];
LLVector4a& center = node->mBounds[0];
LLVector4a& size = node->mBounds[1];
LLVector4a test_min, test_max;
test_min.setSub(center, size);
test_max.setAdd(center, size);
if (!test_min.equals3(min, 0.001f) ||
!test_max.equals3(max, 0.001f))
{
LL_ERRS() << "Bad bounding box data found." << LL_ENDL;
}
test_min.sub(LLVector4a(0.001f));
test_max.add(LLVector4a(0.001f));
for (U32 i = 0; i < branch->getChildCount(); ++i)
{
LLVolumeOctreeListener* child = (LLVolumeOctreeListener*) branch->getChild(i)->getListener(0);
//make sure all children fit inside this node
if (child->mExtents[0].lessThan(test_min).areAnySet(LLVector4Logical::MASK_XYZ) ||
child->mExtents[1].greaterThan(test_max).areAnySet(LLVector4Logical::MASK_XYZ))
{
LL_ERRS() << "Child protrudes from bounding box." << LL_ENDL;
}
}
//children fit, check data
for (typename LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>::const_element_iter iter = branch->getDataBegin();
iter != branch->getDataEnd(); ++iter)
{
const LLVolumeTriangle* tri = *iter;
//validate triangle
for (U32 i = 0; i < 3; i++)
{
if (tri->mV[i]->greaterThan(test_max).areAnySet(LLVector4Logical::MASK_XYZ) ||
tri->mV[i]->lessThan(test_min).areAnySet(LLVector4Logical::MASK_XYZ))
{
LL_ERRS() << "Triangle protrudes from node." << LL_ENDL;
}
}
}
}
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