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Diffstat (limited to 'source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_orco.cc')
-rw-r--r-- | source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_orco.cc | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_orco.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_orco.cc new file mode 100644 index 00000000000..933cf698368 --- /dev/null +++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_orco.cc @@ -0,0 +1,115 @@ +/* + * 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) 2021 by Blender Foundation. + * All rights reserved. + */ + +/** \file + * \ingroup draw + */ + +#include "draw_cache_extract_mesh_private.h" + +namespace blender::draw { + +/* ---------------------------------------------------------------------- */ +/** \name Extract Orco + * \{ */ + +typedef struct MeshExtract_Orco_Data { + float (*vbo_data)[4]; + float (*orco)[3]; +} MeshExtract_Orco_Data; + +static void extract_orco_init(const MeshRenderData *mr, + struct MeshBatchCache *UNUSED(cache), + void *buf, + void *tls_data) +{ + GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf); + static GPUVertFormat format = {0}; + if (format.attr_len == 0) { + /* FIXME(fclem): We use the last component as a way to differentiate from generic vertex + * attributes. This is a substantial waste of video-ram and should be done another way. + * Unfortunately, at the time of writing, I did not found any other "non disruptive" + * alternative. */ + GPU_vertformat_attr_add(&format, "orco", GPU_COMP_F32, 4, GPU_FETCH_FLOAT); + } + + GPU_vertbuf_init_with_format(vbo, &format); + GPU_vertbuf_data_alloc(vbo, mr->loop_len); + + CustomData *cd_vdata = &mr->me->vdata; + + MeshExtract_Orco_Data *data = static_cast<MeshExtract_Orco_Data *>(tls_data); + data->vbo_data = (float(*)[4])GPU_vertbuf_get_data(vbo); + data->orco = static_cast<float(*)[3]>(CustomData_get_layer(cd_vdata, CD_ORCO)); + /* Make sure `orco` layer was requested only if needed! */ + BLI_assert(data->orco); +} + +static void extract_orco_iter_poly_bm(const MeshRenderData *UNUSED(mr), + const BMFace *f, + const int UNUSED(f_index), + void *data) +{ + MeshExtract_Orco_Data *orco_data = (MeshExtract_Orco_Data *)data; + BMLoop *l_iter, *l_first; + l_iter = l_first = BM_FACE_FIRST_LOOP(f); + do { + const int l_index = BM_elem_index_get(l_iter); + float *loop_orco = orco_data->vbo_data[l_index]; + copy_v3_v3(loop_orco, orco_data->orco[BM_elem_index_get(l_iter->v)]); + loop_orco[3] = 0.0; /* Tag as not a generic attribute. */ + } while ((l_iter = l_iter->next) != l_first); +} + +static void extract_orco_iter_poly_mesh(const MeshRenderData *mr, + const MPoly *mp, + const int UNUSED(mp_index), + void *data) +{ + const MLoop *mloop = mr->mloop; + const int ml_index_end = mp->loopstart + mp->totloop; + for (int ml_index = mp->loopstart; ml_index < ml_index_end; ml_index += 1) { + const MLoop *ml = &mloop[ml_index]; + MeshExtract_Orco_Data *orco_data = (MeshExtract_Orco_Data *)data; + float *loop_orco = orco_data->vbo_data[ml_index]; + copy_v3_v3(loop_orco, orco_data->orco[ml->v]); + loop_orco[3] = 0.0; /* Tag as not a generic attribute. */ + } +} + +constexpr MeshExtract create_extractor_orco() +{ + MeshExtract extractor = {nullptr}; + extractor.init = extract_orco_init; + extractor.iter_poly_bm = extract_orco_iter_poly_bm; + extractor.iter_poly_mesh = extract_orco_iter_poly_mesh; + extractor.data_type = MR_DATA_NONE; + extractor.data_size = sizeof(MeshExtract_Orco_Data); + extractor.use_threading = true; + extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.orco); + return extractor; +} + +/** \} */ + +} // namespace blender::draw + +extern "C" { +const MeshExtract extract_orco = blender::draw::create_extractor_orco(); +} |