diff options
Diffstat (limited to 'source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edge_fac.cc')
| -rw-r--r-- | source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edge_fac.cc | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edge_fac.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edge_fac.cc new file mode 100644 index 00000000000..1bc4c7e330f --- /dev/null +++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edge_fac.cc @@ -0,0 +1,241 @@ +/* + * 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 "GPU_capabilities.h" + +#include "draw_cache_extract_mesh_private.h" + +namespace blender::draw { + +/* ---------------------------------------------------------------------- */ +/** \name Extract Edge Factor + * Defines how much an edge is visible. + * \{ */ + +struct MeshExtract_EdgeFac_Data { + uchar *vbo_data; + bool use_edge_render; + /* Number of loop per edge. */ + uchar *edge_loop_count; +}; + +static float loop_edge_factor_get(const float f_no[3], + const float v_co[3], + const float v_no[3], + const float v_next_co[3]) +{ + float enor[3], evec[3]; + sub_v3_v3v3(evec, v_next_co, v_co); + cross_v3_v3v3(enor, v_no, evec); + normalize_v3(enor); + float d = fabsf(dot_v3v3(enor, f_no)); + /* Re-scale to the slider range. */ + d *= (1.0f / 0.065f); + CLAMP(d, 0.0f, 1.0f); + return d; +} + +static void extract_edge_fac_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) { + GPU_vertformat_attr_add(&format, "wd", GPU_COMP_U8, 1, GPU_FETCH_INT_TO_FLOAT_UNIT); + } + + GPU_vertbuf_init_with_format(vbo, &format); + GPU_vertbuf_data_alloc(vbo, mr->loop_len + mr->loop_loose_len); + + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(tls_data); + + if (mr->extract_type == MR_EXTRACT_MESH) { + data->edge_loop_count = static_cast<uchar *>( + MEM_callocN(sizeof(uint32_t) * mr->edge_len, __func__)); + + /* HACK(fclem) Detecting the need for edge render. + * We could have a flag in the mesh instead or check the modifier stack. */ + const MEdge *med = mr->medge; + for (int e_index = 0; e_index < mr->edge_len; e_index++, med++) { + if ((med->flag & ME_EDGERENDER) == 0) { + data->use_edge_render = true; + break; + } + } + } + else { + /* HACK to bypass non-manifold check in mesh_edge_fac_finish(). */ + data->use_edge_render = true; + } + + data->vbo_data = static_cast<uchar *>(GPU_vertbuf_get_data(vbo)); +} + +static void extract_edge_fac_iter_poly_bm(const MeshRenderData *mr, + const BMFace *f, + const int UNUSED(f_index), + void *_data) +{ + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_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 (BM_edge_is_manifold(l_iter->e)) { + float ratio = loop_edge_factor_get(bm_face_no_get(mr, f), + bm_vert_co_get(mr, l_iter->v), + bm_vert_no_get(mr, l_iter->v), + bm_vert_co_get(mr, l_iter->next->v)); + data->vbo_data[l_index] = ratio * 253 + 1; + } + else { + data->vbo_data[l_index] = 255; + } + } while ((l_iter = l_iter->next) != l_first); +} + +static void extract_edge_fac_iter_poly_mesh(const MeshRenderData *mr, + const MPoly *mp, + const int mp_index, + void *_data) +{ + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_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->use_edge_render) { + const MEdge *med = &mr->medge[ml->e]; + data->vbo_data[ml_index] = (med->flag & ME_EDGERENDER) ? 255 : 0; + } + else { + + /* Count loop per edge to detect non-manifold. */ + if (data->edge_loop_count[ml->e] < 3) { + data->edge_loop_count[ml->e]++; + } + if (data->edge_loop_count[ml->e] == 2) { + /* Manifold */ + const int ml_index_last = mp->totloop + mp->loopstart - 1; + const int ml_index_other = (ml_index == ml_index_last) ? mp->loopstart : (ml_index + 1); + const MLoop *ml_next = &mr->mloop[ml_index_other]; + const MVert *v1 = &mr->mvert[ml->v]; + const MVert *v2 = &mr->mvert[ml_next->v]; + float vnor_f[3]; + normal_short_to_float_v3(vnor_f, v1->no); + float ratio = loop_edge_factor_get(mr->poly_normals[mp_index], v1->co, vnor_f, v2->co); + data->vbo_data[ml_index] = ratio * 253 + 1; + } + else { + /* Non-manifold */ + data->vbo_data[ml_index] = 255; + } + } + } +} + +static void extract_edge_fac_iter_ledge_bm(const MeshRenderData *mr, + const BMEdge *UNUSED(eed), + const int ledge_index, + void *_data) +{ + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data); + data->vbo_data[mr->loop_len + (ledge_index * 2) + 0] = 255; + data->vbo_data[mr->loop_len + (ledge_index * 2) + 1] = 255; +} + +static void extract_edge_fac_iter_ledge_mesh(const MeshRenderData *mr, + const MEdge *UNUSED(med), + const int ledge_index, + void *_data) +{ + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data); + + data->vbo_data[mr->loop_len + ledge_index * 2 + 0] = 255; + data->vbo_data[mr->loop_len + ledge_index * 2 + 1] = 255; +} + +static void extract_edge_fac_finish(const MeshRenderData *mr, + struct MeshBatchCache *UNUSED(cache), + void *buf, + void *_data) +{ + GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf); + MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data); + + if (GPU_crappy_amd_driver()) { + /* Some AMD drivers strangely crash with VBO's with a one byte format. + * To workaround we reinitialize the VBO with another format and convert + * all bytes to floats. */ + static GPUVertFormat format = {0}; + if (format.attr_len == 0) { + GPU_vertformat_attr_add(&format, "wd", GPU_COMP_F32, 1, GPU_FETCH_FLOAT); + } + /* We keep the data reference in data->vbo_data. */ + data->vbo_data = static_cast<uchar *>(GPU_vertbuf_steal_data(vbo)); + GPU_vertbuf_clear(vbo); + + int buf_len = mr->loop_len + mr->loop_loose_len; + GPU_vertbuf_init_with_format(vbo, &format); + GPU_vertbuf_data_alloc(vbo, buf_len); + + float *fdata = (float *)GPU_vertbuf_get_data(vbo); + for (int ml_index = 0; ml_index < buf_len; ml_index++, fdata++) { + *fdata = data->vbo_data[ml_index] / 255.0f; + } + /* Free old byte data. */ + MEM_freeN(data->vbo_data); + } + MEM_SAFE_FREE(data->edge_loop_count); +} + +constexpr MeshExtract create_extractor_edge_fac() +{ + MeshExtract extractor = {nullptr}; + extractor.init = extract_edge_fac_init; + extractor.iter_poly_bm = extract_edge_fac_iter_poly_bm; + extractor.iter_poly_mesh = extract_edge_fac_iter_poly_mesh; + extractor.iter_ledge_bm = extract_edge_fac_iter_ledge_bm; + extractor.iter_ledge_mesh = extract_edge_fac_iter_ledge_mesh; + extractor.finish = extract_edge_fac_finish; + extractor.data_type = MR_DATA_POLY_NOR; + extractor.data_size = sizeof(MeshExtract_EdgeFac_Data); + extractor.use_threading = false; + extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.edge_fac); + return extractor; +} + +/** \} */ + +} // namespace blender::draw + +extern "C" { +const MeshExtract extract_edge_fac = blender::draw::create_extractor_edge_fac(); +} |