mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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86 lines
3.8 KiB
C
86 lines
3.8 KiB
C
#ifndef __OPENSUBDIV_OSDUTIL_EVALUATOR_CAPI_H__
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#define __OPENSUBDIV_OSDUTIL_EVALUATOR_CAPI_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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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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/* Types declaration. */
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struct OpenSubdiv_EvaluatorDescr;
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struct OpenSubdiv_TopologyDescr;
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/* Methods to create and delete evaluators. */
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struct OpenSubdiv_EvaluatorDescr *openSubdiv_createEvaluatorDescr(int numVertices);
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void openSubdiv_deleteEvaluatorDescr(struct OpenSubdiv_EvaluatorDescr *evaluator_descr);
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void openSubdiv_createEvaluatorDescrFace(struct OpenSubdiv_EvaluatorDescr *evaluator_descr, int num_vertices, int *indices);
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int openSubdiv_finishEvaluatorDescr(struct OpenSubdiv_EvaluatorDescr *evaluator_descr, int refinementLevel);
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/* Set the positions of points on the coarse mesh and refine. This method */
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/* will perform catmull/clark refinement on the CVs to be ready to call */
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/* openSubdiv_evaluateDescr. Points here are 3 floats/point. */
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int openSubdiv_setEvaluatorCoarsePositions(
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struct OpenSubdiv_EvaluatorDescr *evaluator_descr,
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const float *positions, int numVertices);
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/* Evaluate the subdivision limit surface at the given ptex face and u/v, */
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/* return position and derivative information. Derivative pointers can be */
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/* NULL. Note that face index here is the ptex index, or the index into */
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/* faces after turning all the faces on the original mesh into quads. */
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void openSubdiv_evaluateLimit(
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struct OpenSubdiv_EvaluatorDescr *evaluation_descr,
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int face_id, float u, float v,
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float P[3], float dPdu[3], float dPdv[3]);
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/* Get topology stored in the evaluator descriptor in order to be able */
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/* to check whether it still matches the mesh topology one is going to */
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/* evaluate. */
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void openSubdiv_getEvaluatorTopology(
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struct OpenSubdiv_EvaluatorDescr *evaluation_descr,
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int *numVertices,
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int *refinementLevel,
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int *numIndices,
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int **indices,
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int *numNVerts,
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int **nverts);
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/* Get pointer to a topology descriptor object. */
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/* Useful for cases when some parts of the pipeline needs to know the */
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/* topology object. For example this way it's possible to create a HbrMesh */
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/* having evaluator without duplicating topology object. */
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/* TODO(sergey): Consider moving the API call above to toplogy-capi. */
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/* It'll make current usecase in Blender a bit more complicated, but would */
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/* separate entities in OpenSubdiv side much clearer. */
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struct OpenSubdiv_EvaluatorDescr *openSubdiv_getEvaluatorTopologyDescr(
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struct OpenSubdiv_EvaluatorDescr *evaluator_descr);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __OPENSUBDIV_CAPI_H__ */
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