diff options
Diffstat (limited to 'indra/llmath')
| -rwxr-xr-x | indra/llmath/llvector4a.inl | 20 | ||||
| -rwxr-xr-x | indra/llmath/llvolume.cpp | 219 |
2 files changed, 201 insertions, 38 deletions
diff --git a/indra/llmath/llvector4a.inl b/indra/llmath/llvector4a.inl index 7c52ffef21..558fe09323 100755 --- a/indra/llmath/llvector4a.inl +++ b/indra/llmath/llvector4a.inl @@ -409,6 +409,26 @@ inline void LLVector4a::normalize3fast() mQ = _mm_mul_ps( mQ, approxRsqrt ); } +inline void LLVector4a::normalize3fast_checked(LLVector4a* d) +{ + if (!isFinite3()) + { + *this = d ? *d : LLVector4a(0,1,0,1); + return; + } + + LLVector4a lenSqrd; lenSqrd.setAllDot3( *this, *this ); + + if (lenSqrd.getF32ptr()[0] <= FLT_EPSILON) + { + *this = d ? *d : LLVector4a(0,1,0,1); + return; + } + + const LLQuad approxRsqrt = _mm_rsqrt_ps(lenSqrd.mQ); + mQ = _mm_mul_ps( mQ, approxRsqrt ); +} + // Return true if this vector is normalized with respect to x,y,z up to tolerance inline LLBool32 LLVector4a::isNormalized3( F32 tolerance ) const { diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp index 640e916b4b..426a434e07 100755 --- a/indra/llmath/llvolume.cpp +++ b/indra/llmath/llvolume.cpp @@ -135,6 +135,82 @@ BOOL LLLineSegmentBoxIntersect(const F32* start, const F32* end, const F32* cent return true; } +// Finds tangent vec based on three vertices with texture coordinates. +// Fills in dummy values if the triangle has degenerate texture coordinates. +void calc_tangent_from_triangle( + LLVector4a& normal, + LLVector4a& tangent_out, + const LLVector4a& v1, + const LLVector2& w1, + const LLVector4a& v2, + const LLVector2& w2, + const LLVector4a& v3, + const LLVector2& w3) +{ + const F32* v1ptr = v1.getF32ptr(); + const F32* v2ptr = v2.getF32ptr(); + const F32* v3ptr = v3.getF32ptr(); + + 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); + + LLVector4a n = normal; + LLVector4a t = sdir; + + 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_checked(); + + // Calculate handedness + F32 handedness = ncrosst.dot3(tdir).getF32() < 0.f ? -1.f : 1.f; + + tsubn.getF32ptr()[3] = handedness; + + tangent_out = tsubn; + } + else + { + // degenerate, make up a value + // + tangent_out.set(0,0,1,1); + } + +} // intersect test between triangle vert0, vert1, vert2 and a ray from orig in direction dir. @@ -5907,10 +5983,10 @@ void LLVolumeFace::cacheOptimize() wght = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts); } - LLVector4a* binorm = NULL; + LLVector4a* tangent = NULL; if (mTangents) { - binorm = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts); + tangent = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*num_verts); } //allocate mapping of old indices to new indices @@ -5935,7 +6011,7 @@ void LLVolumeFace::cacheOptimize() } if (mTangents) { - binorm[cur_idx] = mTangents[idx]; + tangent[cur_idx] = mTangents[idx]; } cur_idx++; @@ -5957,7 +6033,7 @@ void LLVolumeFace::cacheOptimize() mNormals = norm; mTexCoords = tc; mWeights = wght; - mTangents = binorm; + mTangents = tangent; //std::string result = llformat("ACMR pre/post: %.3f/%.3f -- %d triangles %d breaks", pre_acmr, post_acmr, mNumIndices/3, breaks); //LL_INFOS() << result << LL_ENDL; @@ -6305,6 +6381,43 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build) cuv = (min_uv + max_uv)*0.5f; + + LLVector4a tangent; + calc_tangent_from_triangle( + *norm, + tangent, + *mCenter, cuv, + pos[0], tc[0], + pos[1], tc[1]); + + if (tangent.getLength3() < 0.01) + { + tangent.set(1,0,0,1); + } + else + { + LLVector4a default_tangent; + default_tangent.set(1,0,0,1); + tangent.normalize3fast_checked(&default_tangent); + } + + 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_checked(); + VertexData vd; vd.setPosition(*mCenter); vd.mTexCoord = cuv; @@ -6317,6 +6430,14 @@ BOOL LLVolumeFace::createCap(LLVolume* volume, BOOL partial_build) num_vertices++; } + allocateTangents(num_vertices); + + for (S32 i = 0; i < num_vertices; i++) + { + mTangents[i].load4a(tangent.getF32ptr()); + norm[i].load4a(normal.getF32ptr()); + } + if (partial_build) { return TRUE; @@ -6551,36 +6672,6 @@ 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; } @@ -6610,11 +6701,13 @@ void LLVolumeFace::createTangents() CalculateTangentArray(mNumVertices, mPositions, mNormals, mTexCoords, mNumIndices/3, mIndices, mTangents); //normalize tangents + LLVector4a default_norm; + default_norm.set(0,1,0,1); for (U32 i = 0; i < mNumVertices; i++) { - //binorm[i].normalize3fast(); + //tangent[i].normalize3fast(); //bump map/planar projection code requires normals to be normalized - mNormals[i].normalize3fast(); + mNormals[i].normalize3fast_checked(); } } } @@ -6799,7 +6892,7 @@ void LLVolumeFace::appendFace(const LLVolumeFace& face, LLMatrix4& mat_in, LLMat //transform appended face normal and store norm_mat.rotate(src_norm[i], dst_norm[i]); - dst_norm[i].normalize3fast(); + dst_norm[i].normalize3fast_checked(); //copy appended face texture coordinate dst_tc[i] = src_tc[i]; @@ -7208,11 +7301,61 @@ 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); + + 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); + + 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 ); + } +} + //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; |