mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-23 12:10:08 +00:00
dabaac8187
Also:
- Add a _numVertices member to cpuSmoothNormalContext (for memory reset function)
- Fix memory reset function in cpuSmoothNormalContext (was performing redundant memsets)
- Add a resetMemory boolean to cpuSmoothNormalContext to make reset step optional (default is off)
124 lines
4.0 KiB
C++
124 lines
4.0 KiB
C++
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#include "../osd/cpuSmoothNormalController.h"
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#include <math.h>
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#include <string.h>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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inline void
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cross(float *n, const float *p0, const float *p1, const float *p2) {
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float a[3] = { p1[0]-p0[0], p1[1]-p0[1], p1[2]-p0[2] };
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float b[3] = { p2[0]-p0[0], p2[1]-p0[1], p2[2]-p0[2] };
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n[0] = a[1]*b[2]-a[2]*b[1];
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n[1] = a[2]*b[0]-a[0]*b[2];
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n[2] = a[0]*b[1]-a[1]*b[0];
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float rn = 1.0f/sqrtf(n[0]*n[0] + n[1]*n[1] + n[2]*n[2]);
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n[0] *= rn;
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n[1] *= rn;
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n[2] *= rn;
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}
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void OsdCpuSmoothNormalController::_smootheNormals(
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OsdCpuSmoothNormalContext * context) {
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OsdVertexBufferDescriptor const & iDesc = context->GetInputVertexDescriptor(),
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& oDesc = context->GetOutputVertexDescriptor();
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assert(iDesc.length==3 and oDesc.length==3);
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float const * iBuffer = context->GetCurrentInputVertexBuffer() + iDesc.offset;
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float * oBuffer = context->GetCurrentOutputVertexBuffer() + oDesc.offset;
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std::vector<unsigned int> const & verts = context->GetControlVertices();
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FarPatchTables::PatchArrayVector const & parrays = context->GetPatchArrayVector();
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if (verts.empty() or parrays.empty() or (not iBuffer) or (not oBuffer)) {
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return;
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}
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for (int i=0; i<(int)parrays.size(); ++i) {
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FarPatchTables::PatchArray const & pa = parrays[i];
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FarPatchTables::Type type = pa.GetDescriptor().GetType();
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if (type==FarPatchTables::QUADS or type==FarPatchTables::TRIANGLES) {
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int nv = FarPatchTables::Descriptor::GetNumControlVertices(type);
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// if necessary, reset all normal values to 0
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if (context->GetResetMemory()) {
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float * ptr = oBuffer;
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for (int j=0; j<context->GetNumVertices(); ++j, ptr += oDesc.stride) {
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memset(ptr, 0, oDesc.length*sizeof(float));
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}
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}
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for (int j=0, idx=pa.GetVertIndex(); j<(int)pa.GetNumPatches(); ++j, idx+=nv) {
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float const * p0 = iBuffer + verts[idx+0]*iDesc.stride,
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* p1 = iBuffer + verts[idx+1]*iDesc.stride,
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* p2 = iBuffer + verts[idx+2]*iDesc.stride;
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// compute face normal
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float n[3];
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cross( n, p0, p1, p2 );
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// add normal to all vertices of the face
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for (int k=0; k<nv; ++k) {
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float * dst = oBuffer + verts[idx+k]*oDesc.stride;
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dst[0] += n[0];
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dst[1] += n[1];
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dst[2] += n[2];
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}
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}
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}
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}
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}
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OsdCpuSmoothNormalController::OsdCpuSmoothNormalController() {
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}
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OsdCpuSmoothNormalController::~OsdCpuSmoothNormalController() {
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}
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void
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OsdCpuSmoothNormalController::Synchronize() {
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}
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} // end namespace OPENSUBDIV_VERSION
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} // end namespace OpenSubdiv
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