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-rwxr-xr-x[-rw-r--r--]indra/llmath/llvolume.cpp427
1 files changed, 224 insertions, 203 deletions
diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp
index 02c8d2b86f..14cebfe5aa 100644..100755
--- a/indra/llmath/llvolume.cpp
+++ b/indra/llmath/llvolume.cpp
@@ -1392,7 +1392,7 @@ void LLPath::genNGon(const LLPathParams& params, S32 sides, F32 startOff, F32 en
pt->mScale.mV[VX] = hole_x * lerp(taper_x_begin, taper_x_end, t);
pt->mScale.mV[VY] = hole_y * lerp(taper_y_begin, taper_y_end, t);
pt->mTexT = t;
-
+
// Twist rotates the path along the x,y plane (I think) - DJS 04/05/02
twist.setQuat (lerp(twist_begin,twist_end,t) * 2.f * F_PI - F_PI,0,0,1);
// Rotate the point around the circle's center.
@@ -1446,7 +1446,7 @@ void LLPath::genNGon(const LLPathParams& params, S32 sides, F32 startOff, F32 en
pt->mScale.mV[VX] = hole_x * lerp(taper_x_begin, taper_x_end, t);
pt->mScale.mV[VY] = hole_y * lerp(taper_y_begin, taper_y_end, t);
pt->mTexT = t;
-
+
// Twist rotates the path along the x,y plane (I think) - DJS 04/05/02
twist.setQuat (lerp(twist_begin,twist_end,t) * 2.f * F_PI - F_PI,0,0,1);
// Rotate the point around the circle's center.
@@ -1594,7 +1594,7 @@ BOOL LLPath::generate(const LLPathParams& params, F32 detail, S32 split,
S32 sides = (S32)llfloor(llfloor((MIN_DETAIL_FACES * detail + twist_mag * 3.5f * (detail-0.5f))) * params.getRevolutions());
if (is_sculpted)
- sides = sculpt_size;
+ sides = llmax(sculpt_size, 1);
genNGon(params, sides);
}
@@ -1644,6 +1644,7 @@ BOOL LLPath::generate(const LLPathParams& params, F32 detail, S32 split,
mPath[i].mScale.mV[0] = lerp(1,params.getScale().mV[0],t);
mPath[i].mScale.mV[1] = lerp(1,params.getScale().mV[1],t);
mPath[i].mTexT = t;
+
mPath[i].mRot.setQuat(F_PI * params.getTwist() * t,1,0,0);
}
@@ -2079,9 +2080,9 @@ void LLVolume::regen()
createVolumeFaces();
}
-void LLVolume::genBinormals(S32 face)
+void LLVolume::genTangents(S32 face)
{
- mVolumeFaces[face].createBinormals();
+ mVolumeFaces[face].createTangents();
}
LLVolume::~LLVolume()
@@ -2442,6 +2443,7 @@ bool LLVolume::unpackVolumeFaces(std::istream& is, S32 size)
LLVector4a pos_range;
pos_range.setSub(max_pos, min_pos);
LLVector2 tc_range2 = max_tc - min_tc;
+
LLVector4a tc_range;
tc_range.set(tc_range2[0], tc_range2[1], tc_range2[0], tc_range2[1]);
LLVector4a min_tc4(min_tc[0], min_tc[1], min_tc[0], min_tc[1]);
@@ -4392,7 +4394,7 @@ void LLVolume::generateSilhouetteVertices(std::vector<LLVector3> &vertices,
segments.push_back(vertices.size());
#if DEBUG_SILHOUETTE_BINORMALS
vertices.push_back(face.mVertices[j].getPosition());
- vertices.push_back(face.mVertices[j].getPosition() + face.mVertices[j].mBinormal*0.1f);
+ vertices.push_back(face.mVertices[j].getPosition() + face.mVertices[j].mTangent*0.1f);
normals.push_back(LLVector3(0,0,1));
normals.push_back(LLVector3(0,0,1));
segments.push_back(vertices.size());
@@ -4508,22 +4510,9 @@ void LLVolume::generateSilhouetteVertices(std::vector<LLVector3> &vertices,
}
}
-S32 LLVolume::lineSegmentIntersect(const LLVector3& start, const LLVector3& end,
- S32 face,
- LLVector3* intersection,LLVector2* tex_coord, LLVector3* normal, LLVector3* bi_normal)
-{
- LLVector4a starta, enda;
- starta.load3(start.mV);
- enda.load3(end.mV);
-
- return lineSegmentIntersect(starta, enda, face, intersection, tex_coord, normal, bi_normal);
-
-}
-
-
S32 LLVolume::lineSegmentIntersect(const LLVector4a& start, const LLVector4a& end,
S32 face,
- LLVector3* intersection,LLVector2* tex_coord, LLVector3* normal, LLVector3* bi_normal)
+ LLVector4a* intersection,LLVector2* tex_coord, LLVector4a* normal, LLVector4a* tangent_out)
{
S32 hit_face = -1;
@@ -4561,9 +4550,9 @@ S32 LLVolume::lineSegmentIntersect(const LLVector4a& start, const LLVector4a& en
if (LLLineSegmentBoxIntersect(start, end, box_center, box_size))
{
- if (bi_normal != NULL) // if the caller wants binormals, we may need to generate them
+ if (tangent_out != NULL) // if the caller wants tangents, we may need to generate them
{
- genBinormals(i);
+ genTangents(i);
}
if (isUnique())
@@ -4597,7 +4586,7 @@ S32 LLVolume::lineSegmentIntersect(const LLVector4a& start, const LLVector4a& en
LLVector4a intersect = dir;
intersect.mul(closest_t);
intersect.add(start);
- intersection->set(intersect.getF32ptr());
+ *intersection = intersect;
}
@@ -4612,19 +4601,42 @@ S32 LLVolume::lineSegmentIntersect(const LLVector4a& start, const LLVector4a& en
if (normal!= NULL)
{
- LLVector4* norm = (LLVector4*) face.mNormals;
-
- *normal = ((1.f - a - b) * LLVector3(norm[idx0]) +
- a * LLVector3(norm[idx1]) +
- b * LLVector3(norm[idx2]));
+ LLVector4a* norm = face.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);
+
+ *normal = n1;
}
- if (bi_normal != NULL)
+ if (tangent_out != NULL)
{
- LLVector4* binormal = (LLVector4*) face.mBinormals;
- *bi_normal = ((1.f - a - b) * LLVector3(binormal[idx0]) +
- a * LLVector3(binormal[idx1]) +
- b * LLVector3(binormal[idx2]));
+ LLVector4a* tangents = face.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);
+
+ *tangent_out = t1;
}
}
}
@@ -4637,7 +4649,7 @@ S32 LLVolume::lineSegmentIntersect(const LLVector4a& start, const LLVector4a& en
face.createOctree();
}
- LLOctreeTriangleRayIntersect intersect(start, dir, &face, &closest_t, intersection, tex_coord, normal, bi_normal);
+ LLOctreeTriangleRayIntersect intersect(start, dir, &face, &closest_t, intersection, tex_coord, normal, tangent_out);
intersect.traverse(face.mOctree);
if (intersect.mHitFace)
{
@@ -5183,7 +5195,7 @@ LLVolumeFace::LLVolumeFace() :
mNumIndices(0),
mPositions(NULL),
mNormals(NULL),
- mBinormals(NULL),
+ mTangents(NULL),
mTexCoords(NULL),
mIndices(NULL),
mWeights(NULL),
@@ -5206,7 +5218,7 @@ LLVolumeFace::LLVolumeFace(const LLVolumeFace& src)
mNumIndices(0),
mPositions(NULL),
mNormals(NULL),
- mBinormals(NULL),
+ mTangents(NULL),
mTexCoords(NULL),
mIndices(NULL),
mWeights(NULL),
@@ -5264,15 +5276,15 @@ LLVolumeFace& LLVolumeFace::operator=(const LLVolumeFace& src)
}
- if (src.mBinormals)
+ if (src.mTangents)
{
- allocateBinormals(src.mNumVertices);
- LLVector4a::memcpyNonAliased16((F32*) mBinormals, (F32*) src.mBinormals, vert_size);
+ allocateTangents(src.mNumVertices);
+ LLVector4a::memcpyNonAliased16((F32*) mTangents, (F32*) src.mTangents, vert_size);
}
else
{
- ll_aligned_free_16(mBinormals);
- mBinormals = NULL;
+ ll_aligned_free_16(mTangents);
+ mTangents = NULL;
}
if (src.mWeights)
@@ -5316,8 +5328,8 @@ void LLVolumeFace::freeData()
mTexCoords = NULL;
ll_aligned_free_16(mIndices);
mIndices = NULL;
- ll_aligned_free_16(mBinormals);
- mBinormals = NULL;
+ ll_aligned_free_16(mTangents);
+ mTangents = NULL;
ll_aligned_free_16(mWeights);
mWeights = NULL;
@@ -5897,7 +5909,7 @@ void LLVolumeFace::cacheOptimize()
}
LLVector4a* binorm = NULL;
- if (mBinormals)
+ if (mTangents)
{
binorm = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts);
}
@@ -5922,9 +5934,9 @@ void LLVolumeFace::cacheOptimize()
{
wght[cur_idx] = mWeights[idx];
}
- if (mBinormals)
+ if (mTangents)
{
- binorm[cur_idx] = mBinormals[idx];
+ binorm[cur_idx] = mTangents[idx];
}
cur_idx++;
@@ -5940,13 +5952,13 @@ void LLVolumeFace::cacheOptimize()
ll_aligned_free_16(mNormals);
ll_aligned_free_16(mTexCoords);
ll_aligned_free_16(mWeights);
- ll_aligned_free_16(mBinormals);
+ ll_aligned_free_16(mTangents);
mPositions = pos;
mNormals = norm;
mTexCoords = tc;
mWeights = wght;
- mBinormals = binorm;
+ mTangents = binorm;
//std::string result = llformat("ACMR pre/post: %.3f/%.3f -- %d triangles %d breaks", pre_acmr, post_acmr, mNumIndices/3, breaks);
//llinfos << result << llendl;
@@ -6027,7 +6039,7 @@ void LLVolumeFace::swapData(LLVolumeFace& rhs)
{
llswap(rhs.mPositions, mPositions);
llswap(rhs.mNormals, mNormals);
- llswap(rhs.mBinormals, mBinormals);
+ llswap(rhs.mTangents, mTangents);
llswap(rhs.mTexCoords, mTexCoords);
llswap(rhs.mIndices,mIndices);
llswap(rhs.mNumVertices, mNumVertices);
@@ -6066,12 +6078,7 @@ BOOL LLVolumeFace::createUnCutCubeCap(LLVolume* volume, BOOL partial_build)
S32 max_t = volume->getPath().mPath.size();
// S32 i;
- S32 num_vertices = 0, num_indices = 0;
S32 grid_size = (profile.size()-1)/4;
- S32 quad_count = (grid_size * grid_size);
-
- num_vertices = (grid_size+1)*(grid_size+1);
- num_indices = quad_count * 4;
LLVector4a& min = mExtents[0];
LLVector4a& max = mExtents[1];
@@ -6121,22 +6128,11 @@ BOOL LLVolumeFace::createUnCutCubeCap(LLVolume* volume, BOOL partial_build)
corners[2].mTexCoord=swap;
}
- LLVector4a binormal;
-
- calc_binormal_from_triangle( binormal,
- corners[0].getPosition(), corners[0].mTexCoord,
- corners[1].getPosition(), corners[1].mTexCoord,
- corners[2].getPosition(), corners[2].mTexCoord);
-
- binormal.normalize3fast();
-
S32 size = (grid_size+1)*(grid_size+1);
resizeVertices(size);
- allocateBinormals(size);
-
+
LLVector4a* pos = (LLVector4a*) mPositions;
LLVector4a* norm = (LLVector4a*) mNormals;
- LLVector4a* binorm = (LLVector4a*) mBinormals;
LLVector2* tc = (LLVector2*) mTexCoords;
for(int gx = 0;gx<grid_size+1;gx++)
@@ -6155,8 +6151,7 @@ BOOL LLVolumeFace::createUnCutCubeCap(LLVolume* volume, BOOL partial_build)
*pos++ = newVert.getPosition();
*norm++ = baseVert.getNormal();
*tc++ = newVert.mTexCoord;
- *binorm++ = binormal;
-
+
if (gx == 0 && gy == 0)
{
min = newVert.getPosition();
@@ -6232,8 +6227,7 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
if (!(mTypeMask & HOLLOW_MASK) && !(mTypeMask & OPEN_MASK))
{
resizeVertices(num_vertices+1);
- allocateBinormals(num_vertices+1);
-
+
if (!partial_build)
{
resizeIndices(num_indices+3);
@@ -6242,8 +6236,7 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
else
{
resizeVertices(num_vertices);
- allocateBinormals(num_vertices);
-
+
if (!partial_build)
{
resizeIndices(num_indices);
@@ -6277,8 +6270,7 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
LLVector2* tc = (LLVector2*) mTexCoords;
LLVector4a* pos = (LLVector4a*) mPositions;
LLVector4a* norm = (LLVector4a*) mNormals;
- LLVector4a* binorm = (LLVector4a*) mBinormals;
-
+
// Copy the vertices into the array
for (S32 i = 0; i < num_vertices; i++)
{
@@ -6314,31 +6306,6 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
cuv = (min_uv + max_uv)*0.5f;
- LLVector4a binormal;
- calc_binormal_from_triangle(binormal,
- *mCenter, cuv,
- pos[0], tc[0],
- pos[1], tc[1]);
- binormal.normalize3fast();
-
- LLVector4a normal;
- LLVector4a d0, d1;
-
-
- d0.setSub(*mCenter, pos[0]);
- d1.setSub(*mCenter, pos[1]);
-
- if (mTypeMask & TOP_MASK)
- {
- normal.setCross3(d0, d1);
- }
- else
- {
- normal.setCross3(d1, d0);
- }
-
- normal.normalize3fast();
-
VertexData vd;
vd.setPosition(*mCenter);
vd.mTexCoord = cuv;
@@ -6347,15 +6314,10 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
{
pos[num_vertices] = *mCenter;
tc[num_vertices] = cuv;
+
num_vertices++;
}
- for (S32 i = 0; i < num_vertices; i++)
- {
- binorm[i].load4a(binormal.getF32ptr());
- norm[i].load4a(normal.getF32ptr());
- }
-
if (partial_build)
{
return TRUE;
@@ -6590,63 +6552,68 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build)
}
-
+
+ LLVector4a d0,d1;
+
+ d0.setSub(mPositions[mIndices[1]], mPositions[mIndices[0]]);
+ d1.setSub(mPositions[mIndices[2]], mPositions[mIndices[0]]);
+
+ LLVector4a normal;
+ normal.setCross3(d0,d1);
+
+ if (normal.dot3(normal).getF32() > F_APPROXIMATELY_ZERO)
+ {
+ normal.normalize3fast();
+ }
+ else
+ { //degenerate, make up a value
+ normal.set(0,0,1);
+ }
+
+ llassert(llfinite(normal.getF32ptr()[0]));
+ llassert(llfinite(normal.getF32ptr()[1]));
+ llassert(llfinite(normal.getF32ptr()[2]));
+
+ llassert(!llisnan(normal.getF32ptr()[0]));
+ llassert(!llisnan(normal.getF32ptr()[1]));
+ llassert(!llisnan(normal.getF32ptr()[2]));
+
+ for (S32 i = 0; i < num_vertices; i++)
+ {
+ norm[i].load4a(normal.getF32ptr());
+ }
+
return TRUE;
}
-void LLVolumeFace::createBinormals()
+void CalculateTangentArray(U32 vertexCount, const LLVector4a *vertex, const LLVector4a *normal,
+ const LLVector2 *texcoord, U32 triangleCount, const U16* index_array, LLVector4a *tangent);
+
+void LLVolumeFace::createTangents()
{
- if (!mBinormals)
+ if (!mTangents)
{
- allocateBinormals(mNumVertices);
+ allocateTangents(mNumVertices);
- //generate binormals
- LLVector4a* pos = mPositions;
- LLVector2* tc = (LLVector2*) mTexCoords;
- LLVector4a* binorm = (LLVector4a*) mBinormals;
+ //generate tangents
+ //LLVector4a* pos = mPositions;
+ //LLVector2* tc = (LLVector2*) mTexCoords;
+ LLVector4a* binorm = (LLVector4a*) mTangents;
- LLVector4a* end = mBinormals+mNumVertices;
+ LLVector4a* end = mTangents+mNumVertices;
while (binorm < end)
{
(*binorm++).clear();
}
- binorm = mBinormals;
-
- for (U32 i = 0; i < mNumIndices/3; i++)
- { //for each triangle
- const U16& i0 = mIndices[i*3+0];
- const U16& i1 = mIndices[i*3+1];
- const U16& i2 = mIndices[i*3+2];
-
- //calculate binormal
- LLVector4a binormal;
- calc_binormal_from_triangle(binormal,
- pos[i0], tc[i0],
- pos[i1], tc[i1],
- pos[i2], tc[i2]);
-
-
- //add triangle normal to vertices
- binorm[i0].add(binormal);
- binorm[i1].add(binormal);
- binorm[i2].add(binormal);
+ binorm = mTangents;
- //even out quad contributions
- if (i % 2 == 0)
- {
- binorm[i2].add(binormal);
- }
- else
- {
- binorm[i1].add(binormal);
- }
- }
+ CalculateTangentArray(mNumVertices, mPositions, mNormals, mTexCoords, mNumIndices/3, mIndices, mTangents);
- //normalize binormals
+ //normalize tangents
for (U32 i = 0; i < mNumVertices; i++)
{
- binorm[i].normalize3fast();
+ //binorm[i].normalize3fast();
//bump map/planar projection code requires normals to be normalized
mNormals[i].normalize3fast();
}
@@ -6657,10 +6624,10 @@ void LLVolumeFace::resizeVertices(S32 num_verts)
{
ll_aligned_free_16(mPositions);
ll_aligned_free_16(mNormals);
- ll_aligned_free_16(mBinormals);
+ ll_aligned_free_16(mTangents);
ll_aligned_free_16(mTexCoords);
- mBinormals = NULL;
+ mTangents = NULL;
if (num_verts)
{
@@ -6710,9 +6677,9 @@ void LLVolumeFace::pushVertex(const LLVector4a& pos, const LLVector4a& norm, con
ll_assert_aligned(mTexCoords,16);
- //just clear binormals
- ll_aligned_free_16(mBinormals);
- mBinormals = NULL;
+ //just clear tangents
+ ll_aligned_free_16(mTangents);
+ mTangents = NULL;
mPositions[mNumVertices] = pos;
mNormals[mNumVertices] = norm;
@@ -6721,10 +6688,10 @@ void LLVolumeFace::pushVertex(const LLVector4a& pos, const LLVector4a& norm, con
mNumVertices++;
}
-void LLVolumeFace::allocateBinormals(S32 num_verts)
+void LLVolumeFace::allocateTangents(S32 num_verts)
{
- ll_aligned_free_16(mBinormals);
- mBinormals = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts);
+ ll_aligned_free_16(mTangents);
+ mTangents = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts);
}
void LLVolumeFace::allocateWeights(S32 num_verts)
@@ -6961,7 +6928,6 @@ BOOL LLVolumeFace::createSide(LLVolume* volume, BOOL partial_build)
if ((mTypeMask & INNER_MASK) && (mTypeMask & FLAT_MASK) && mNumS > 2 && s > 0)
{
-
pos[cur_vertex].load3(mesh[i].mPos.mV);
tc[cur_vertex] = LLVector2(ss,tt);
@@ -6992,7 +6958,6 @@ BOOL LLVolumeFace::createSide(LLVolume* volume, BOOL partial_build)
}
}
-
//get bounding box for this side
LLVector4a& face_min = mExtents[0];
LLVector4a& face_max = mExtents[1];
@@ -7098,6 +7063,14 @@ BOOL LLVolumeFace::createSide(LLVolume* volume, BOOL partial_build)
n[1]->add(c);
n[2]->add(c);
+ llassert(llfinite(c.getF32ptr()[0]));
+ llassert(llfinite(c.getF32ptr()[1]));
+ llassert(llfinite(c.getF32ptr()[2]));
+
+ llassert(!llisnan(c.getF32ptr()[0]));
+ llassert(!llisnan(c.getF32ptr()[1]));
+ llassert(!llisnan(c.getF32ptr()[2]));
+
//even out quad contributions
n[i%2+1]->add(c);
}
@@ -7236,53 +7209,101 @@ BOOL LLVolumeFace::createSide(LLVolume* volume, BOOL partial_build)
return TRUE;
}
-// Finds binormal based on three vertices with texture coordinates.
-// Fills in dummy values if the triangle has degenerate texture coordinates.
-void calc_binormal_from_triangle(LLVector4a& binormal,
-
- const LLVector4a& pos0,
- const LLVector2& tex0,
- const LLVector4a& pos1,
- const LLVector2& tex1,
- const LLVector4a& pos2,
- const LLVector2& tex2)
-{
- LLVector4a rx0( pos0[VX], tex0.mV[VX], tex0.mV[VY] );
- LLVector4a rx1( pos1[VX], tex1.mV[VX], tex1.mV[VY] );
- LLVector4a rx2( pos2[VX], tex2.mV[VX], tex2.mV[VY] );
-
- LLVector4a ry0( pos0[VY], tex0.mV[VX], tex0.mV[VY] );
- LLVector4a ry1( pos1[VY], tex1.mV[VX], tex1.mV[VY] );
- LLVector4a ry2( pos2[VY], tex2.mV[VX], tex2.mV[VY] );
-
- LLVector4a rz0( pos0[VZ], tex0.mV[VX], tex0.mV[VY] );
- LLVector4a rz1( pos1[VZ], tex1.mV[VX], tex1.mV[VY] );
- LLVector4a rz2( pos2[VZ], tex2.mV[VX], tex2.mV[VY] );
-
- LLVector4a lhs, rhs;
-
- LLVector4a r0;
- lhs.setSub(rx0, rx1); rhs.setSub(rx0, rx2);
- r0.setCross3(lhs, rhs);
+//adapted from Lengyel, Eric. “Computing Tangent Space Basis Vectors for an Arbitrary Mesh”. Terathon Software 3D Graphics Library, 2001. http://www.terathon.com/code/tangent.html
+void CalculateTangentArray(U32 vertexCount, const LLVector4a *vertex, const LLVector4a *normal,
+ const LLVector2 *texcoord, U32 triangleCount, const U16* index_array, LLVector4a *tangent)
+{
+ //LLVector4a *tan1 = new LLVector4a[vertexCount * 2];
+ LLVector4a* tan1 = (LLVector4a*) ll_aligned_malloc_16(vertexCount*2*sizeof(LLVector4a));
+
+ LLVector4a* tan2 = tan1 + vertexCount;
+
+ memset(tan1, 0, vertexCount*2*sizeof(LLVector4a));
+
+ for (U32 a = 0; a < triangleCount; a++)
+ {
+ U32 i1 = *index_array++;
+ U32 i2 = *index_array++;
+ U32 i3 = *index_array++;
+
+ const LLVector4a& v1 = vertex[i1];
+ const LLVector4a& v2 = vertex[i2];
+ const LLVector4a& v3 = vertex[i3];
+
+ const LLVector2& w1 = texcoord[i1];
+ const LLVector2& w2 = texcoord[i2];
+ const LLVector2& w3 = texcoord[i3];
+
+ const F32* v1ptr = v1.getF32ptr();
+ const F32* v2ptr = v2.getF32ptr();
+ const F32* v3ptr = v3.getF32ptr();
- LLVector4a r1;
- lhs.setSub(ry0, ry1); rhs.setSub(ry0, ry2);
- r1.setCross3(lhs, rhs);
-
- LLVector4a r2;
- lhs.setSub(rz0, rz1); rhs.setSub(rz0, rz2);
- r2.setCross3(lhs, rhs);
+ float x1 = v2ptr[0] - v1ptr[0];
+ float x2 = v3ptr[0] - v1ptr[0];
+ float y1 = v2ptr[1] - v1ptr[1];
+ float y2 = v3ptr[1] - v1ptr[1];
+ float z1 = v2ptr[2] - v1ptr[2];
+ float z2 = v3ptr[2] - v1ptr[2];
+
+ float s1 = w2.mV[0] - w1.mV[0];
+ float s2 = w3.mV[0] - w1.mV[0];
+ float t1 = w2.mV[1] - w1.mV[1];
+ float t2 = w3.mV[1] - w1.mV[1];
+
+ F32 rd = s1*t2-s2*t1;
+
+ float r = ((rd*rd) > FLT_EPSILON) ? 1.0F / rd : 1024.f; //some made up large ratio for division by zero
+
+ llassert(llfinite(r));
+ llassert(!llisnan(r));
+
+ LLVector4a sdir((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r,
+ (t2 * z1 - t1 * z2) * r);
+ LLVector4a tdir((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r,
+ (s1 * z2 - s2 * z1) * r);
+
+ tan1[i1].add(sdir);
+ tan1[i2].add(sdir);
+ tan1[i3].add(sdir);
+
+ tan2[i1].add(tdir);
+ tan2[i2].add(tdir);
+ tan2[i3].add(tdir);
+ }
+
+ for (U32 a = 0; a < vertexCount; a++)
+ {
+ LLVector4a n = normal[a];
+
+ const LLVector4a& t = tan1[a];
+
+ LLVector4a ncrosst;
+ ncrosst.setCross3(n,t);
+
+ // Gram-Schmidt orthogonalize
+ n.mul(n.dot3(t).getF32());
+
+ LLVector4a tsubn;
+ tsubn.setSub(t,n);
+
+ if (tsubn.dot3(tsubn).getF32() > F_APPROXIMATELY_ZERO)
+ {
+ tsubn.normalize3fast();
+
+ // Calculate handedness
+ F32 handedness = ncrosst.dot3(tan2[a]).getF32() < 0.f ? -1.f : 1.f;
+
+ tsubn.getF32ptr()[3] = handedness;
- if( r0[VX] && r1[VX] && r2[VX] )
- {
- binormal.set(
- -r0[VZ] / r0[VX],
- -r1[VZ] / r1[VX],
- -r2[VZ] / r2[VX]);
- // binormal.normVec();
- }
- else
- {
- binormal.set( 0, 1 , 0 );
- }
+ tangent[a] = tsubn;
+ }
+ else
+ { //degenerate, make up a value
+ tangent[a].set(0,0,1,1);
+ }
+ }
+
+ ll_aligned_free_16(tan1);
}
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-14 06:20:47 +0000