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-rw-r--r--indra/llmath/llvolumeoctree.cpp256
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diff --git a/indra/llmath/llvolumeoctree.cpp b/indra/llmath/llvolumeoctree.cpp
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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) ? false : true;
+}
+
+
+LLVolumeOctreeListener::LLVolumeOctreeListener(LLOctreeNode<LLVolumeTriangle>* node)
+{
+ node->addListener(this);
+}
+
+LLVolumeOctreeListener::~LLVolumeOctreeListener()
+{
+
+}
+
+void LLVolumeOctreeListener::handleChildAddition(const LLOctreeNode<LLVolumeTriangle>* parent,
+ LLOctreeNode<LLVolumeTriangle>* child)
+{
+ new LLVolumeOctreeListener(child);
+}
+
+
+LLOctreeTriangleRayIntersect::LLOctreeTriangleRayIntersect(const LLVector4a& start, const LLVector4a& dir,
+ const LLVolumeFace* face, F32* closest_t,
+ LLVector3* intersection,LLVector2* tex_coord, LLVector3* normal, LLVector3* bi_normal)
+ : mFace(face),
+ mStart(start),
+ mDir(dir),
+ mIntersection(intersection),
+ mTexCoord(tex_coord),
+ mNormal(normal),
+ mBinormal(bi_normal),
+ mClosestT(closest_t),
+ mHitFace(false)
+{
+ mEnd.setAdd(mStart, mDir);
+}
+
+void LLOctreeTriangleRayIntersect::traverse(const LLOctreeNode<LLVolumeTriangle>* node)
+{
+ LLVolumeOctreeListener* vl = (LLVolumeOctreeListener*) node->getListener(0);
+
+ /*const F32* start = mStart.getF32();
+ const F32* end = mEnd.getF32();
+ const F32* center = vl->mBounds[0].getF32();
+ const F32* size = vl->mBounds[1].getF32();*/
+
+ //if (LLLineSegmentBoxIntersect(mStart, mEnd, vl->mBounds[0], vl->mBounds[1]))
+ if (LLLineSegmentBoxIntersect(mStart.getF32ptr(), mEnd.getF32ptr(), vl->mBounds[0].getF32ptr(), vl->mBounds[1].getF32ptr()))
+ {
+ node->accept(this);
+ for (S32 i = 0; i < node->getChildCount(); ++i)
+ {
+ traverse(node->getChild(i));
+ }
+ }
+}
+
+void LLOctreeTriangleRayIntersect::visit(const LLOctreeNode<LLVolumeTriangle>* node)
+{
+ for (LLOctreeNode<LLVolumeTriangle>::const_element_iter iter =
+ node->getData().begin(); iter != node->getData().end(); ++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->set(intersect.getF32ptr());
+ }
+
+
+ if (mTexCoord != NULL)
+ {
+ LLVector2* tc = (LLVector2*) mFace->mTexCoords;
+ *mTexCoord = ((1.f - a - b) * tc[tri->mIndex[0]] +
+ a * tc[tri->mIndex[1]] +
+ b * tc[tri->mIndex[2]]);
+
+ }
+
+ if (mNormal != NULL)
+ {
+ LLVector4* norm = (LLVector4*) mFace->mNormals;
+
+ *mNormal = ((1.f - a - b) * LLVector3(norm[tri->mIndex[0]]) +
+ a * LLVector3(norm[tri->mIndex[1]]) +
+ b * LLVector3(norm[tri->mIndex[2]]));
+ }
+
+ if (mBinormal != NULL)
+ {
+ LLVector4* binormal = (LLVector4*) mFace->mBinormals;
+ *mBinormal = ((1.f - a - b) * LLVector3(binormal[tri->mIndex[0]]) +
+ a * LLVector3(binormal[tri->mIndex[1]]) +
+ b * LLVector3(binormal[tri->mIndex[2]]));
+ }
+ }
+ }
+ }
+}
+
+const LLVector4a& LLVolumeTriangle::getPositionGroup() const
+{
+ return mPositionGroup;
+}
+
+const F32& LLVolumeTriangle::getBinRadius() const
+{
+ return mRadius;
+}
+
+
+//TEST CODE
+
+void LLVolumeOctreeValidate::visit(const LLOctreeNode<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))
+ {
+ llerrs << "Bad bounding box data found." << llendl;
+ }
+
+ 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))
+ {
+ llerrs << "Child protrudes from bounding box." << llendl;
+ }
+ }
+
+ //children fit, check data
+ for (LLOctreeNode<LLVolumeTriangle>::const_element_iter iter = branch->getData().begin();
+ iter != branch->getData().end(); ++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))
+ {
+ llerrs << "Triangle protrudes from node." << llendl;
+ }
+ }
+ }
+}
+
+
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