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https://github.com/PixarAnimationStudios/OpenSubdiv
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b66380ee52
Since unified shading work already removed subPatch info from Osd::PatchDescriptor, the difference between Far::PatchDescriptor and Osd::PatchDescriptor is just maxValence and numElements. They are used for legacy gregory patch drawing. Both maxValence and numElements are actually constant within a topology (drawContext). This change move maxValence to DrawContext and let client manage numElements, then we can eliminate Osd::PatchDescriptor and simply use Far::PatchDescritor instead. This is still an intermediate step toward further DrawRegistry refactoring. For the time being, adding EffectDesc struct to include maxValence and numValence to be maintained by the clients. They will be cleaned up later. The side benefit of this change is we no longer need to recompile regular b-spline shaders for the different max-valences.
134 lines
4.3 KiB
C++
134 lines
4.3 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/drawContext.h"
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#include "../far/patchTables.h"
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#include <cstring>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Osd {
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DrawContext::~DrawContext() {}
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void
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DrawContext::ConvertPatchArrays(Far::PatchTables const &patchTables,
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PatchArrayVector &osdPatchArrays) {
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int narrays = patchTables.GetNumPatchArrays();
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// allocate drawing patch arrays
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osdPatchArrays.clear();
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osdPatchArrays.reserve(narrays);
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for (int array=0, pidx=0, vidx=0, qidx=0; array<narrays; ++array) {
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Far::PatchDescriptor desc = patchTables.GetPatchArrayDescriptor(array);
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int npatches = patchTables.GetNumPatches(array),
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nverts = desc.GetNumControlVertices();
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osdPatchArrays.push_back(PatchArray(desc, npatches, vidx, pidx, qidx));
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vidx += npatches * nverts;
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pidx += npatches;
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qidx += (desc.GetType() == Far::PatchDescriptor::GREGORY) ? npatches*nverts : 0;
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}
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}
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// note : it is likely that Far::PatchTables::GetPatchControlVerticesTable()
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// will eventually be deprecated if control vertices cannot be kept
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// in a single linear array of indices. This function will help
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// packing patch control vertices for GPU buffers.
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void
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DrawContext::packPatchVerts(Far::PatchTables const & patchTables,
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std::vector<Index> & dst) {
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dst.resize(patchTables.GetNumControlVerticesTotal());
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Index * ptr = &dst[0];
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int narrays = patchTables.GetNumPatchArrays();
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for (int array=0; array<narrays; ++array) {
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Far::ConstIndexArray verts = patchTables.GetPatchArrayVertices(array);
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memcpy(ptr, verts.begin(), verts.size()*sizeof(Index));
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ptr += verts.size();
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}
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}
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void
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DrawContext::packSharpnessValues(Far::PatchTables const & patchTables,
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std::vector<unsigned int> & dst) {
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Far::PatchParamTable const & patchParamTables =
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patchTables.GetPatchParamTable();
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std::vector<int> const &sharpnessIndexTable =
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patchTables.GetSharpnessIndexTable();
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std::vector<float> const &sharpnessValues =
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patchTables.GetSharpnessValues();
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int npatches = (int)patchParamTables.size();
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// PatchParam = sizeof(int)*2, 1 float for sharpness
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dst.resize(npatches * (2 + 1));
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for (int i = 0; i < npatches; ++i) {
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float sharpness = sharpnessIndexTable[i] >= 0 ?
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sharpnessValues[sharpnessIndexTable[i]] : 0.0f;
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dst[i*3+0] = patchParamTables[i].faceIndex;
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dst[i*3+1] = patchParamTables[i].bitField.field;
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dst[i*3+2] = *((unsigned int *)&sharpness);
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}
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}
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void
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DrawContext::packFVarData(Far::PatchTables const & patchTables,
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int fvarWidth, FVarData const & src, FVarData & dst) {
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assert(fvarWidth and (not src.empty()));
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// XXXX OsdMesh only accesses channel 0
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Far::ConstIndexArray indices = patchTables.GetFVarPatchesValues(0);
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dst.resize(indices.size() * fvarWidth);
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float * ptr = &dst[0];
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for (int fvert=0; fvert<(int)indices.size(); ++fvert, ptr+=fvarWidth) {
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int index = indices[fvert] * fvarWidth;
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assert(index<(int)src.size());
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memcpy(ptr, &src[index], fvarWidth*sizeof(float));
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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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