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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 "BLI_bitmap.h"
#include "BLI_vector.hh"
#include "atomic_ops.h"
#include "MEM_guardedalloc.h"
#include "extract_mesh.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Paint Mask Line Indices
* \{ */
struct MeshExtract_LinePaintMask_Data {
GPUIndexBufBuilder elb;
/** One bit per edge set if face is selected. */
BLI_bitmap *select_map;
};
static void extract_lines_paint_mask_init(const MeshRenderData *mr,
struct MeshBatchCache *UNUSED(cache),
void *UNUSED(ibo),
void *tls_data)
{
MeshExtract_LinePaintMask_Data *data = static_cast<MeshExtract_LinePaintMask_Data *>(tls_data);
data->select_map = BLI_BITMAP_NEW(mr->edge_len, __func__);
GPU_indexbuf_init(&data->elb, GPU_PRIM_LINES, mr->edge_len, mr->loop_len);
}
static void extract_lines_paint_mask_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int UNUSED(mp_index),
void *_data)
{
MeshExtract_LinePaintMask_Data *data = static_cast<MeshExtract_LinePaintMask_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];
const int e_index = ml->e;
const MEdge *me = &mr->medge[e_index];
if (!((mr->use_hide && (me->flag & ME_HIDE)) ||
((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->e_origindex) &&
(mr->e_origindex[e_index] == ORIGINDEX_NONE)))) {
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);
if (mp->flag & ME_FACE_SEL) {
if (BLI_BITMAP_TEST_AND_SET_ATOMIC(data->select_map, e_index)) {
/* Hide edge as it has more than 2 selected loop. */
GPU_indexbuf_set_line_restart(&data->elb, e_index);
}
else {
/* First selected loop. Set edge visible, overwriting any unselected loop. */
GPU_indexbuf_set_line_verts(&data->elb, e_index, ml_index, ml_index_other);
}
}
else {
/* Set these unselected loop only if this edge has no other selected loop. */
if (!BLI_BITMAP_TEST(data->select_map, e_index)) {
GPU_indexbuf_set_line_verts(&data->elb, e_index, ml_index, ml_index_other);
}
}
}
else {
GPU_indexbuf_set_line_restart(&data->elb, e_index);
}
}
}
static void extract_lines_paint_mask_finish(const MeshRenderData *UNUSED(mr),
struct MeshBatchCache *UNUSED(cache),
void *buf,
void *_data)
{
MeshExtract_LinePaintMask_Data *data = static_cast<MeshExtract_LinePaintMask_Data *>(_data);
GPUIndexBuf *ibo = static_cast<GPUIndexBuf *>(buf);
GPU_indexbuf_build_in_place(&data->elb, ibo);
MEM_freeN(data->select_map);
}
constexpr MeshExtract create_extractor_lines_paint_mask()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_lines_paint_mask_init;
extractor.iter_poly_mesh = extract_lines_paint_mask_iter_poly_mesh;
extractor.finish = extract_lines_paint_mask_finish;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(MeshExtract_LinePaintMask_Data);
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, ibo.lines_paint_mask);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_lines_paint_mask = blender::draw::create_extractor_lines_paint_mask();
}
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