151 lines
7.7 KiB
C
151 lines
7.7 KiB
C
/*
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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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* The Original Code is Copyright (C) 2018 by Blender Foundation.
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* All rights reserved.
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*/
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/** \file
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* \ingroup bke
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*/
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#pragma once
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#include "BLI_sys_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct Mesh;
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struct Subdiv;
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/* Returns true if evaluator is ready for use. */
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bool BKE_subdiv_eval_begin(struct Subdiv *subdiv);
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/* coarse_vertex_cos is an optional argument which allows to override coordinates of the coarse
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* mesh. */
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bool BKE_subdiv_eval_begin_from_mesh(struct Subdiv *subdiv,
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const struct Mesh *mesh,
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const float (*coarse_vertex_cos)[3]);
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bool BKE_subdiv_eval_refine_from_mesh(struct Subdiv *subdiv,
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const struct Mesh *mesh,
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const float (*coarse_vertex_cos)[3]);
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/* Makes sure displacement evaluator is initialized.
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*
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* NOTE: This function must be called once before evaluating displacement or
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* final surface position. */
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void BKE_subdiv_eval_init_displacement(struct Subdiv *subdiv);
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/* Single point queries. */
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/* Evaluate point at a limit surface, with optional derivatives and normal. */
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void BKE_subdiv_eval_limit_point(
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struct Subdiv *subdiv, const int ptex_face_index, const float u, const float v, float r_P[3]);
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void BKE_subdiv_eval_limit_point_and_derivatives(struct Subdiv *subdiv,
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const int ptex_face_index,
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const float u,
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const float v,
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float r_P[3],
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float r_dPdu[3],
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float r_dPdv[3]);
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void BKE_subdiv_eval_limit_point_and_normal(struct Subdiv *subdiv,
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const int ptex_face_index,
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const float u,
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const float v,
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float r_P[3],
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float r_N[3]);
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void BKE_subdiv_eval_limit_point_and_short_normal(struct Subdiv *subdiv,
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const int ptex_face_index,
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const float u,
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const float v,
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float r_P[3],
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short r_N[3]);
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/* Evaluate face-varying layer (such as UV). */
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void BKE_subdiv_eval_face_varying(struct Subdiv *subdiv,
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const int face_varying_channel,
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const int ptex_face_index,
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const float u,
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const float v,
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float r_face_varying[2]);
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/* NOTE: Expects derivatives to be correct.
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*
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* TODO(sergey): This is currently used together with
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* BKE_subdiv_eval_final_point() which can easily evaluate derivatives.
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* Would be nice to have displacement evaluation function which does not require
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* knowing derivatives ahead of a time. */
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void BKE_subdiv_eval_displacement(struct Subdiv *subdiv,
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const int ptex_face_index,
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const float u,
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const float v,
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const float dPdu[3],
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const float dPdv[3],
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float r_D[3]);
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/* Evaluate point on a limit surface with displacement applied to it. */
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void BKE_subdiv_eval_final_point(
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struct Subdiv *subdiv, const int ptex_face_index, const float u, const float v, float r_P[3]);
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/* Patch queries at given resolution.
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*
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* Will evaluate patch at uniformly distributed (u, v) coordinates on a grid
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* of given resolution, producing resolution^2 evaluation points. The order
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* goes as u in rows, v in columns. */
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void BKE_subdiv_eval_limit_patch_resolution_point(struct Subdiv *subdiv,
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const int ptex_face_index,
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const int resolution,
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void *buffer,
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const int offset,
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const int stride);
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void BKE_subdiv_eval_limit_patch_resolution_point_and_derivatives(struct Subdiv *subdiv,
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const int ptex_face_index,
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const int resolution,
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void *point_buffer,
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const int point_offset,
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const int point_stride,
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void *du_buffer,
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const int du_offset,
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const int du_stride,
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void *dv_buffer,
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const int dv_offset,
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const int dv_stride);
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void BKE_subdiv_eval_limit_patch_resolution_point_and_normal(struct Subdiv *subdiv,
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const int ptex_face_index,
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const int resolution,
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void *point_buffer,
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const int point_offset,
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const int point_stride,
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void *normal_buffer,
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const int normal_offset,
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const int normal_stride);
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void BKE_subdiv_eval_limit_patch_resolution_point_and_short_normal(struct Subdiv *subdiv,
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const int ptex_face_index,
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const int resolution,
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void *point_buffer,
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const int point_offset,
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const int point_stride,
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void *normal_buffer,
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const int normal_offset,
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const int normal_stride);
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#ifdef __cplusplus
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}
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#endif
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