diff options
Diffstat (limited to 'source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_weights.cc')
| -rw-r--r-- | source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_weights.cc | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_weights.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_weights.cc new file mode 100644 index 00000000000..aae266eadce --- /dev/null +++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_weights.cc @@ -0,0 +1,189 @@ +/* + * 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 "MEM_guardedalloc.h" + +#include "BKE_deform.h" + +#include "draw_cache_extract_mesh_private.h" + +namespace blender::draw { + +/* ---------------------------------------------------------------------- */ +/** \name Extract Vertex Weight + * \{ */ + +struct MeshExtract_Weight_Data { + float *vbo_data; + const DRW_MeshWeightState *wstate; + const MDeformVert *dvert; /* For #Mesh. */ + int cd_ofs; /* For #BMesh. */ +}; + +static float evaluate_vertex_weight(const MDeformVert *dvert, const DRW_MeshWeightState *wstate) +{ + /* Error state. */ + if ((wstate->defgroup_active < 0) && (wstate->defgroup_len > 0)) { + return -2.0f; + } + if (dvert == nullptr) { + return (wstate->alert_mode != OB_DRAW_GROUPUSER_NONE) ? -1.0f : 0.0f; + } + + float input = 0.0f; + if (wstate->flags & DRW_MESH_WEIGHT_STATE_MULTIPAINT) { + /* Multi-Paint feature */ + bool is_normalized = (wstate->flags & (DRW_MESH_WEIGHT_STATE_AUTO_NORMALIZE | + DRW_MESH_WEIGHT_STATE_LOCK_RELATIVE)); + input = BKE_defvert_multipaint_collective_weight(dvert, + wstate->defgroup_len, + wstate->defgroup_sel, + wstate->defgroup_sel_count, + is_normalized); + /* make it black if the selected groups have no weight on a vertex */ + if (input == 0.0f) { + return -1.0f; + } + } + else { + /* default, non tricky behavior */ + input = BKE_defvert_find_weight(dvert, wstate->defgroup_active); + + if (input == 0.0f) { + switch (wstate->alert_mode) { + case OB_DRAW_GROUPUSER_ACTIVE: + return -1.0f; + break; + case OB_DRAW_GROUPUSER_ALL: + if (BKE_defvert_is_weight_zero(dvert, wstate->defgroup_len)) { + return -1.0f; + } + break; + } + } + } + + /* Lock-Relative: display the fraction of current weight vs total unlocked weight. */ + if (wstate->flags & DRW_MESH_WEIGHT_STATE_LOCK_RELATIVE) { + input = BKE_defvert_lock_relative_weight( + input, dvert, wstate->defgroup_len, wstate->defgroup_locked, wstate->defgroup_unlocked); + } + + CLAMP(input, 0.0f, 1.0f); + return input; +} + +static void extract_weights_init(const MeshRenderData *mr, + struct MeshBatchCache *cache, + void *buf, + void *tls_data) +{ + GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf); + static GPUVertFormat format = {0}; + if (format.attr_len == 0) { + GPU_vertformat_attr_add(&format, "weight", GPU_COMP_F32, 1, GPU_FETCH_FLOAT); + } + GPU_vertbuf_init_with_format(vbo, &format); + GPU_vertbuf_data_alloc(vbo, mr->loop_len + mr->loop_loose_len); + + MeshExtract_Weight_Data *data = static_cast<MeshExtract_Weight_Data *>(tls_data); + data->vbo_data = (float *)GPU_vertbuf_get_data(vbo); + data->wstate = &cache->weight_state; + + if (data->wstate->defgroup_active == -1) { + /* Nothing to show. */ + data->dvert = nullptr; + data->cd_ofs = -1; + } + else if (mr->extract_type == MR_EXTRACT_BMESH) { + data->dvert = nullptr; + data->cd_ofs = CustomData_get_offset(&mr->bm->vdata, CD_MDEFORMVERT); + } + else { + data->dvert = (const MDeformVert *)CustomData_get_layer(&mr->me->vdata, CD_MDEFORMVERT); + data->cd_ofs = -1; + } +} + +static void extract_weights_iter_poly_bm(const MeshRenderData *UNUSED(mr), + const BMFace *f, + const int UNUSED(f_index), + void *_data) +{ + MeshExtract_Weight_Data *data = static_cast<MeshExtract_Weight_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); + if (data->cd_ofs != -1) { + const MDeformVert *dvert = (const MDeformVert *)BM_ELEM_CD_GET_VOID_P(l_iter->v, + data->cd_ofs); + data->vbo_data[l_index] = evaluate_vertex_weight(dvert, data->wstate); + } + else { + data->vbo_data[l_index] = evaluate_vertex_weight(nullptr, data->wstate); + } + } while ((l_iter = l_iter->next) != l_first); +} + +static void extract_weights_iter_poly_mesh(const MeshRenderData *mr, + const MPoly *mp, + const int UNUSED(mp_index), + void *_data) +{ + MeshExtract_Weight_Data *data = static_cast<MeshExtract_Weight_Data *>(_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]; + if (data->dvert != nullptr) { + const MDeformVert *dvert = &data->dvert[ml->v]; + data->vbo_data[ml_index] = evaluate_vertex_weight(dvert, data->wstate); + } + else { + const MDeformVert *dvert = nullptr; + data->vbo_data[ml_index] = evaluate_vertex_weight(dvert, data->wstate); + } + } +} + +constexpr MeshExtract create_extractor_weights() +{ + MeshExtract extractor = {nullptr}; + extractor.init = extract_weights_init; + extractor.iter_poly_bm = extract_weights_iter_poly_bm; + extractor.iter_poly_mesh = extract_weights_iter_poly_mesh; + extractor.data_type = MR_DATA_NONE; + extractor.data_size = sizeof(MeshExtract_Weight_Data); + extractor.use_threading = true; + extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.weights); + return extractor; +} + +/** \} */ + +} // namespace blender::draw + +extern "C" { +const MeshExtract extract_weights = blender::draw::create_extractor_weights(); +} |