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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 "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();
}
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