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/*
* 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 "extract_mesh.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Face-dots positions
* \{ */
static void extract_fdots_pos_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, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->poly_len);
void *vbo_data = GPU_vertbuf_get_data(vbo);
*(float(**)[3])tls_data = static_cast<float(*)[3]>(vbo_data);
}
static void extract_fdots_pos_iter_poly_bm(const MeshRenderData *mr,
const BMFace *f,
const int f_index,
void *data)
{
float(*center)[3] = *static_cast<float(**)[3]>(data);
float *co = center[f_index];
zero_v3(co);
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
add_v3_v3(co, bm_vert_co_get(mr, l_iter->v));
} while ((l_iter = l_iter->next) != l_first);
mul_v3_fl(co, 1.0f / (float)f->len);
}
static void extract_fdots_pos_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int mp_index,
void *data)
{
float(*center)[3] = *static_cast<float(**)[3]>(data);
float *co = center[mp_index];
zero_v3(co);
const MVert *mvert = mr->mvert;
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 (mr->use_subsurf_fdots) {
const MVert *mv = &mr->mvert[ml->v];
if (mv->flag & ME_VERT_FACEDOT) {
copy_v3_v3(center[mp_index], mv->co);
break;
}
}
else {
const MVert *mv = &mvert[ml->v];
add_v3_v3(center[mp_index], mv->co);
}
}
if (!mr->use_subsurf_fdots) {
mul_v3_fl(co, 1.0f / (float)mp->totloop);
}
}
constexpr MeshExtract create_extractor_fdots_pos()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_fdots_pos_init;
extractor.iter_poly_bm = extract_fdots_pos_iter_poly_bm;
extractor.iter_poly_mesh = extract_fdots_pos_iter_poly_mesh;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(float(*)[3]);
extractor.use_threading = true;
extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.fdots_pos);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_fdots_pos = blender::draw::create_extractor_fdots_pos();
}
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