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