139 lines
6.1 KiB
C
139 lines
6.1 KiB
C
// Copyright 2013 Blender Foundation. All rights reserved.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// Author: Sergey Sharybin
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#ifndef OPENSUBDIV_EVALUATOR_CAPI_H_
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#define OPENSUBDIV_EVALUATOR_CAPI_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct OpenSubdiv_EvaluatorInternal;
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struct OpenSubdiv_PatchCoord;
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struct OpenSubdiv_TopologyRefiner;
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typedef struct OpenSubdiv_Evaluator {
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// Set coarse positions from a continuous array of coordinates.
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void (*setCoarsePositions)(struct OpenSubdiv_Evaluator *evaluator,
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const float *positions,
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const int start_vertex_index,
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const int num_vertices);
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// Set varying data from a continuous array of data.
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void (*setVaryingData)(struct OpenSubdiv_Evaluator *evaluator,
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const float *varying_data,
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const int start_vertex_index,
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const int num_vertices);
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// Set face varying data from a continuous array of data.
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//
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// TODO(sergey): Find a better name for vertex here. It is not the vertex of
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// geometry, but a vertex of UV map.
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void (*setFaceVaryingData)(struct OpenSubdiv_Evaluator *evaluator,
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const int face_varying_channel,
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const float *face_varying_data,
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const int start_vertex_index,
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const int num_vertices);
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// Set coarse vertex position from a continuous memory buffer where
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// first coordinate starts at offset of `start_offset` and there is `stride`
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// bytes between adjacent vertex coordinates.
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void (*setCoarsePositionsFromBuffer)(struct OpenSubdiv_Evaluator *evaluator,
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const void *buffer,
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const int start_offset,
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const int stride,
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const int start_vertex_index,
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const int num_vertices);
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// Set varying data from a continuous memory buffer where
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// first coordinate starts at offset of `start_offset` and there is `stride`
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// bytes between adjacent vertex coordinates.
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void (*setVaryingDataFromBuffer)(struct OpenSubdiv_Evaluator *evaluator,
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const void *buffer,
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const int start_offset,
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const int stride,
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const int start_vertex_index,
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const int num_vertices);
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// Set face varying data from a continuous memory buffer where
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// first coordinate starts at offset of `start_offset` and there is `stride`
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// bytes between adjacent vertex coordinates.
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//
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// TODO(sergey): Find a better name for vertex here. It is not the vertex of
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// geometry, but a vertex of UV map.
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void (*setFaceVaryingDataFromBuffer)(struct OpenSubdiv_Evaluator *evaluator,
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const int face_varying_channel,
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const void *buffer,
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const int start_offset,
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const int stride,
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const int start_vertex_index,
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const int num_vertices);
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// Refine after coarse positions update.
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void (*refine)(struct OpenSubdiv_Evaluator *evaluator);
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// Evaluate given ptex face at given bilinear coordinate.
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// If derivatives are NULL, they will not be evaluated.
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void (*evaluateLimit)(struct OpenSubdiv_Evaluator *evaluator,
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const int ptex_face_index,
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float face_u,
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float face_v,
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float P[3],
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float dPdu[3],
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float dPdv[3]);
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// Evaluate varying data at a given bilinear coordinate of given ptex face.
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void (*evaluateVarying)(struct OpenSubdiv_Evaluator *evaluator,
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const int ptex_face_index,
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float face_u,
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float face_v,
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float varying[3]);
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// Evaluate face-varying data at a given bilinear coordinate of given
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// ptex face.
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void (*evaluateFaceVarying)(struct OpenSubdiv_Evaluator *evaluator,
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const int face_varying_channel,
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const int ptex_face_index,
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float face_u,
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float face_v,
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float face_varying[2]);
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// Batched evaluation of multiple input coordinates.
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// Evaluate limit surface.
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// If derivatives are NULL, they will not be evaluated.
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//
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// NOTE: Output arrays must point to a memory of size float[3]*num_patch_coords.
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void (*evaluatePatchesLimit)(struct OpenSubdiv_Evaluator *evaluator,
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const struct OpenSubdiv_PatchCoord *patch_coords,
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const int num_patch_coords,
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float *P,
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float *dPdu,
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float *dPdv);
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// Implementation of the evaluator.
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struct OpenSubdiv_EvaluatorImpl *impl;
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} OpenSubdiv_Evaluator;
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OpenSubdiv_Evaluator *openSubdiv_createEvaluatorFromTopologyRefiner(
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struct OpenSubdiv_TopologyRefiner *topology_refiner);
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void openSubdiv_deleteEvaluator(OpenSubdiv_Evaluator *evaluator);
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#ifdef __cplusplus
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}
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#endif
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#endif // OPENSUBDIV_EVALUATOR_CAPI_H_
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