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// Copyright 2018 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_INTERNAL_H_
#define OPENSUBDIV_EVALUATOR_INTERNAL_H_
#ifdef _MSC_VER
# include <iso646.h>
#endif
#include <opensubdiv/far/patchMap.h>
#include <opensubdiv/far/patchTable.h>
struct OpenSubdiv_PatchCoord;
struct OpenSubdiv_TopologyRefiner;
namespace opensubdiv_capi {
// Anonymous forward declaration of actual evaluator implementation.
class CpuEvalOutput;
// Wrapper around implementaiton, which defines API which we are capable to
// provide over the implementation.
//
// TODO(sergey): It is almost the same as C-API object, so ideally need to
// merge them somehow, but how to do this and keep files with all the templates
// and such separate?
class CpuEvalOutputAPI {
public:
// NOTE: API object becomes an owner of evaluator. Patch we are referencing.
CpuEvalOutputAPI(CpuEvalOutput *implementation, OpenSubdiv::Far::PatchMap *patch_map);
~CpuEvalOutputAPI();
// Set coarse positions from a continuous array of coordinates.
void setCoarsePositions(const float *positions,
const int start_vertex_index,
const int num_vertices);
// Set varying data from a continuous array of data.
void setVaryingData(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(const int face_varying_channel,
const float *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(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(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(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();
// Evaluate given ptex face at given bilinear coordinate.
// If derivatives are NULL, they will not be evaluated.
void evaluateLimit(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(const int ptes_face_index, float face_u, float face_v, float varying[3]);
// Evaluate facee-varying data at a given bilinear coordinate of given
// ptex face.
void evaluateFaceVarying(const int face_varying_channel,
const int ptes_face_index,
float face_u,
float face_v,
float face_varying[2]);
// Batched evaluation of multiple input coordinates.
// Evaluate given ptex face at given bilinear coordinate.
// 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(const OpenSubdiv_PatchCoord *patch_coords,
const int num_patch_coords,
float *P,
float *dPdu,
float *dPdv);
protected:
CpuEvalOutput *implementation_;
OpenSubdiv::Far::PatchMap *patch_map_;
};
} // namespace opensubdiv_capi
struct OpenSubdiv_EvaluatorInternal {
public:
OpenSubdiv_EvaluatorInternal();
~OpenSubdiv_EvaluatorInternal();
opensubdiv_capi::CpuEvalOutputAPI *eval_output;
const OpenSubdiv::Far::PatchMap *patch_map;
const OpenSubdiv::Far::PatchTable *patch_table;
};
OpenSubdiv_EvaluatorInternal *openSubdiv_createEvaluatorInternal(
struct OpenSubdiv_TopologyRefiner *topology_refiner);
void openSubdiv_deleteEvaluatorInternal(OpenSubdiv_EvaluatorInternal *evaluator);
#endif // OPENSUBDIV_EVALUATOR_INTERNAL_H_
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