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Diffstat (limited to 'source/blender/blenkernel/intern/subdiv_eval.c')
| -rw-r--r-- | source/blender/blenkernel/intern/subdiv_eval.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/subdiv_eval.c b/source/blender/blenkernel/intern/subdiv_eval.c new file mode 100644 index 00000000000..0ab19fc8df5 --- /dev/null +++ b/source/blender/blenkernel/intern/subdiv_eval.c @@ -0,0 +1,319 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * 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. + * + * The Original Code is Copyright (C) 2018 by Blender Foundation. + * All rights reserved. + * + * Contributor(s): Sergey Sharybin. + * + * ***** END GPL LICENSE BLOCK ***** + */ + +/** \file blender/blenkernel/intern/subdiv_eval.c + * \ingroup bke + */ + +#include "BKE_subdiv.h" + +#include "DNA_mesh_types.h" +#include "DNA_meshdata_types.h" + +#include "BLI_utildefines.h" +#include "BLI_math_vector.h" + +#include "BKE_customdata.h" + +#ifdef WITH_OPENSUBDIV +# include "opensubdiv_evaluator_capi.h" +# include "opensubdiv_topology_refiner_capi.h" +#endif + +void BKE_subdiv_eval_begin(Subdiv *subdiv) +{ +#ifdef WITH_OPENSUBDIV + if (subdiv->evaluator == NULL) { + subdiv->evaluator = openSubdiv_createEvaluatorFromTopologyRefiner( + subdiv->topology_refiner); + } + else { + /* TODO(sergey): Check for topology change. */ + } +#else + UNUSED_VARS(subdiv); +#endif +} + +#ifdef WITH_OPENSUBDIV +static void set_face_varying_data_from_uv(Subdiv *subdiv, + const MLoopUV *mloopuv, + const int layer_index) +{ + OpenSubdiv_TopologyRefiner *topology_refiner = subdiv->topology_refiner; + OpenSubdiv_Evaluator *evaluator = subdiv->evaluator; + const int num_faces = topology_refiner->getNumFaces(topology_refiner); + const MLoopUV *mluv = mloopuv; + /* TODO(sergey): OpenSubdiv's C-API converter can change winding of + * loops of a face, need to watch for that, to prevent wrong UVs assigned. + */ + for (int face_index = 0; face_index < num_faces; ++face_index) { + const int num_face_vertices = topology_refiner->getNumFaceVertices( + topology_refiner, face_index); + const int *uv_indicies = topology_refiner->getFaceFVarValueIndices( + topology_refiner, face_index, layer_index); + for (int vertex_index = 0; + vertex_index < num_face_vertices; + vertex_index++, mluv++) + { + evaluator->setFaceVaryingData(evaluator, + mluv->uv, + uv_indicies[vertex_index], + 1); + } + } +} +#endif + +void BKE_subdiv_eval_update_from_mesh(Subdiv *subdiv, const Mesh *mesh) +{ +#ifdef WITH_OPENSUBDIV + BKE_subdiv_eval_begin(subdiv); + /* Set coordinates of base mesh vertices. */ + subdiv->evaluator->setCoarsePositionsFromBuffer( + subdiv->evaluator, + mesh->mvert, + offsetof(MVert, co), + sizeof(MVert), + 0, mesh->totvert); + /* Set face-varyign data to UV maps. */ + const int num_uv_layers = + CustomData_number_of_layers(&mesh->ldata, CD_MLOOPUV); + for (int layer_index = 0; layer_index < num_uv_layers; layer_index++) { + const MLoopUV *mloopuv = CustomData_get_layer_n( + &mesh->ldata, CD_MLOOPUV, layer_index); + set_face_varying_data_from_uv(subdiv, mloopuv, layer_index); + /* NOTE: Currently evaluator can only handle single face varying layer. + * This is a limitation of C-API and some underlying helper classes from + * our side which will get fixed. + */ + break; + } + /* Update evaluator to the new coarse geometry. */ + subdiv->evaluator->refine(subdiv->evaluator); +#else + UNUSED_VARS(subdiv, mesh); +#endif +} + +/* ========================== Single point queries ========================== */ + +void BKE_subdiv_eval_limit_point( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3]) +{ + BKE_subdiv_eval_limit_point_and_derivatives(subdiv, + ptex_face_index, + u, v, + P, NULL, NULL); +} + +void BKE_subdiv_eval_limit_point_and_derivatives( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], float dPdu[3], float dPdv[3]) +{ +#ifdef WITH_OPENSUBDIV + subdiv->evaluator->evaluateLimit(subdiv->evaluator, + ptex_face_index, + u, v, + P, dPdu, dPdv); +#else + UNUSED_VARS(subdiv, ptex_face_index, u, v, P, dPdu, dPdv); +#endif +} + +void BKE_subdiv_eval_limit_point_and_normal( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], float N[3]) +{ + float dPdu[3], dPdv[3]; + BKE_subdiv_eval_limit_point_and_derivatives(subdiv, + ptex_face_index, + u, v, + P, dPdu, dPdv); + cross_v3_v3v3(N, dPdu, dPdv); + normalize_v3(N); +} + +void BKE_subdiv_eval_limit_point_and_short_normal( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float P[3], short N[3]) +{ + float N_float[3]; + BKE_subdiv_eval_limit_point_and_normal(subdiv, + ptex_face_index, + u, v, + P, N_float); + normal_float_to_short_v3(N, N_float); +} + +void BKE_subdiv_eval_face_varying( + Subdiv *subdiv, + const int ptex_face_index, + const float u, const float v, + float face_varying[2]) +{ +#ifdef WITH_OPENSUBDIV + subdiv->evaluator->evaluateFaceVarying(subdiv->evaluator, + ptex_face_index, + u, v, + face_varying); +#else + UNUSED_VARS(subdiv, ptex_face_index, u, v, face_varying); +#endif +} + +/* =================== Patch queries at given resolution =================== */ + +/* Move buffer forward by a given number of bytes. */ +static void buffer_apply_offset(void **buffer, const int offset) +{ + *buffer = ((unsigned char *)*buffer) + offset; +} + +/* Write given number of floats to the beginning of given buffer. */ +static void buffer_write_float_value(void **buffer, + const float *values_buffer, int num_values) +{ + memcpy(*buffer, values_buffer, sizeof(float) * num_values); +} + +/* Similar to above, just operates with short values. */ +static void buffer_write_short_value(void **buffer, + const short *values_buffer, int num_values) +{ + memcpy(*buffer, values_buffer, sizeof(short) * num_values); +} + +void BKE_subdiv_eval_limit_patch_resolution_point( + Subdiv *subdiv, + const int ptex_face_index, + const int resolution, + void *buffer, const int offset, const int stride) +{ + buffer_apply_offset(&buffer, offset); + const float inv_resolution_1 = 1.0f / (float)(resolution - 1); + for (int y = 0; y < resolution; y++) { + const float v = y * inv_resolution_1; + for (int x = 0; x < resolution; x++) { + const float u = x * inv_resolution_1; + BKE_subdiv_eval_limit_point(subdiv, + ptex_face_index, + u, v, + buffer); + buffer_apply_offset(&buffer, stride); + } + } +} + +void BKE_subdiv_eval_limit_patch_resolution_point_and_derivatives( + Subdiv *subdiv, + const int ptex_face_index, + const int resolution, + void *point_buffer, const int point_offset, const int point_stride, + void *du_buffer, const int du_offset, const int du_stride, + void *dv_buffer, const int dv_offset, const int dv_stride) +{ + buffer_apply_offset(&point_buffer, point_offset); + buffer_apply_offset(&du_buffer, du_offset); + buffer_apply_offset(&dv_buffer, dv_offset); + const float inv_resolution_1 = 1.0f / (float)(resolution - 1); + for (int y = 0; y < resolution; y++) { + const float v = y * inv_resolution_1; + for (int x = 0; x < resolution; x++) { + const float u = x * inv_resolution_1; + BKE_subdiv_eval_limit_point_and_derivatives( + subdiv, + ptex_face_index, + u, v, + point_buffer, du_buffer, dv_buffer); + buffer_apply_offset(&point_buffer, point_stride); + buffer_apply_offset(&du_buffer, du_stride); + buffer_apply_offset(&dv_buffer, dv_stride); + } + } +} + +void BKE_subdiv_eval_limit_patch_resolution_point_and_normal( + Subdiv *subdiv, + const int ptex_face_index, + const int resolution, + void *point_buffer, const int point_offset, const int point_stride, + void *normal_buffer, const int normal_offset, const int normal_stride) +{ + buffer_apply_offset(&point_buffer, point_offset); + buffer_apply_offset(&normal_buffer, normal_offset); + const float inv_resolution_1 = 1.0f / (float)(resolution - 1); + for (int y = 0; y < resolution; y++) { + const float v = y * inv_resolution_1; + for (int x = 0; x < resolution; x++) { + const float u = x * inv_resolution_1; + float normal[3]; + BKE_subdiv_eval_limit_point_and_normal( + subdiv, + ptex_face_index, + u, v, + point_buffer, normal); + buffer_write_float_value(&normal_buffer, normal, 3); + buffer_apply_offset(&point_buffer, point_stride); + buffer_apply_offset(&normal_buffer, normal_stride); + } + } +} + +void BKE_subdiv_eval_limit_patch_resolution_point_and_short_normal( + Subdiv *subdiv, + const int ptex_face_index, + const int resolution, + void *point_buffer, const int point_offset, const int point_stride, + void *normal_buffer, const int normal_offset, const int normal_stride) +{ + buffer_apply_offset(&point_buffer, point_offset); + buffer_apply_offset(&normal_buffer, normal_offset); + const float inv_resolution_1 = 1.0f / (float)(resolution - 1); + for (int y = 0; y < resolution; y++) { + const float v = y * inv_resolution_1; + for (int x = 0; x < resolution; x++) { + const float u = x * inv_resolution_1; + short normal[3]; + BKE_subdiv_eval_limit_point_and_short_normal( + subdiv, + ptex_face_index, + u, v, + point_buffer, normal); + buffer_write_short_value(&normal_buffer, normal, 3); + buffer_apply_offset(&point_buffer, point_stride); + buffer_apply_offset(&normal_buffer, normal_stride); + } + } +} |