mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-12-12 03:50:09 +00:00
121 lines
3.6 KiB
C++
121 lines
3.6 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/ompKernel.h"
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#include "../osd/vertexDescriptor.h"
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#include <cassert>
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#include <cstdlib>
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#include <omp.h>
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#include <vector>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Osd {
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template <class T> T *
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elementAtIndex(T * src, int index, VertexBufferDescriptor const &desc) {
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return src + index * desc.stride;
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}
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static inline void
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clear(float *dst, VertexBufferDescriptor const &desc) {
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assert(dst);
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memset(dst, 0, desc.length*sizeof(float));
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}
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static inline void
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addWithWeight(float *dst, const float *src, int srcIndex, float weight,
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VertexBufferDescriptor const &desc) {
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assert(src and dst);
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src = elementAtIndex(src, srcIndex, desc);
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for (int k = 0; k < desc.length; ++k) {
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dst[k] += src[k] * weight;
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}
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}
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static inline void
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copy(float *dst, int dstIndex, const float *src,
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VertexBufferDescriptor const &desc) {
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assert(src and dst);
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dst = elementAtIndex(dst, dstIndex, desc);
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memcpy(dst, src, desc.length*sizeof(float));
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}
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// XXXX manuelk this should be optimized further by using SIMD - considering
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// OMP is somewhat obsolete - this is probably not worth it.
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void
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OmpComputeStencils(VertexBufferDescriptor const &vertexDesc,
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float const * vertexSrc,
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float * vertexDst,
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unsigned char const * sizes,
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int const * offsets,
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int const * indices,
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float const * weights,
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int start, int end) {
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assert(start>=0 and start<end);
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int numThreads = omp_get_max_threads(),
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nstencils = end-start;
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float * result = (float*)alloca(vertexDesc.length*numThreads*sizeof(float));
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#pragma omp parallel for
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for (int i=0; i<nstencils; ++i) {
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int index = i + (start>0 ? start : 0); // Stencil index
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// Get thread-local pointers
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int const * threadIndices = indices + offsets[index];
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float const * threadWeights = weights + offsets[index];
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int threadId = omp_get_thread_num();
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float * threadResult = result + threadId*vertexDesc.length;
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clear(threadResult, vertexDesc);
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for (int j=0; j<(int)sizes[index]; ++j) {
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addWithWeight(threadResult, vertexSrc,
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threadIndices[j], threadWeights[j], vertexDesc);
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}
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copy(vertexDst, i, threadResult, vertexDesc);
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}
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}
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} // end namespace Osd
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} // end namespace OPENSUBDIV_VERSION
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} // end namespace OpenSubdiv
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