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//
// Copyright 2013 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "far_utils.h"
struct FVarVertex {
float u,v;
void Clear() {
u=v=0.0f;
}
void AddWithWeight(FVarVertex const & src, float weight) {
u += weight * src.u;
v += weight * src.v;
}
};
void
InterpolateFVarData(OpenSubdiv::Far::TopologyRefiner & refiner,
Shape const & shape, std::vector<float> & fvarData) {
int channel = 0, // shapes only have 1 UV channel
fvarWidth = 2;
int maxlevel = refiner.GetMaxLevel(),
numValuesM = refiner.GetLevel(maxlevel).GetNumFVarValues(channel),
numValuesTotal = refiner.GetNumFVarValuesTotal(channel);
if (shape.uvs.empty() || numValuesTotal<=0) {
return;
}
OpenSubdiv::Far::PrimvarRefiner primvarRefiner(refiner);
if (refiner.IsUniform()) {
// For uniform we only keep the highest level of refinement:
fvarData.resize(numValuesM * fvarWidth);
std::vector<FVarVertex> buffer(numValuesTotal - numValuesM);
FVarVertex * src = &buffer[0];
memcpy(src, &shape.uvs[0], shape.uvs.size()*sizeof(float));
// Defer the last level to treat separately with its alternate destination:
for (int level = 1; level < maxlevel; ++level) {
FVarVertex * dst = src + refiner.GetLevel(level-1).GetNumFVarValues(channel);
primvarRefiner.InterpolateFaceVarying(level, src, dst, channel);
src = dst;
}
FVarVertex * dst = reinterpret_cast<FVarVertex *>(&fvarData[0]);
primvarRefiner.InterpolateFaceVarying(maxlevel, src, dst, channel);
} else {
// For adaptive we keep all levels:
fvarData.resize(numValuesTotal * fvarWidth);
FVarVertex * src = reinterpret_cast<FVarVertex *>(&fvarData[0]);
memcpy(src, &shape.uvs[0], shape.uvs.size()*sizeof(float));
for (int level = 1; level <= maxlevel; ++level) {
FVarVertex * dst = src + refiner.GetLevel(level-1).GetNumFVarValues(channel);
primvarRefiner.InterpolateFaceVarying(level, src, dst, channel);
src = dst;
}
}
}
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