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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_mesh.h"
#include "extract_mesh.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Edit UV angle stretch
* \{ */
struct UVStretchAngle {
int16_t angle;
int16_t uv_angles[2];
};
struct MeshExtract_StretchAngle_Data {
UVStretchAngle *vbo_data;
MLoopUV *luv;
float auv[2][2], last_auv[2];
float av[2][3], last_av[3];
int cd_ofs;
};
static void compute_normalize_edge_vectors(float auv[2][2],
float av[2][3],
const float uv[2],
const float uv_prev[2],
const float co[3],
const float co_prev[3])
{
/* Move previous edge. */
copy_v2_v2(auv[0], auv[1]);
copy_v3_v3(av[0], av[1]);
/* 2d edge */
sub_v2_v2v2(auv[1], uv_prev, uv);
normalize_v2(auv[1]);
/* 3d edge */
sub_v3_v3v3(av[1], co_prev, co);
normalize_v3(av[1]);
}
static short v2_to_short_angle(const float v[2])
{
return atan2f(v[1], v[0]) * (float)M_1_PI * SHRT_MAX;
}
static void edituv_get_edituv_stretch_angle(float auv[2][2],
const float av[2][3],
UVStretchAngle *r_stretch)
{
/* Send UV's to the shader and let it compute the aspect corrected angle. */
r_stretch->uv_angles[0] = v2_to_short_angle(auv[0]);
r_stretch->uv_angles[1] = v2_to_short_angle(auv[1]);
/* Compute 3D angle here. */
r_stretch->angle = angle_normalized_v3v3(av[0], av[1]) * (float)M_1_PI * SHRT_MAX;
#if 0 /* here for reference, this is done in shader now. */
float uvang = angle_normalized_v2v2(auv0, auv1);
float ang = angle_normalized_v3v3(av0, av1);
float stretch = fabsf(uvang - ang) / (float)M_PI;
return 1.0f - pow2f(1.0f - stretch);
#endif
}
static void extract_edituv_stretch_angle_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) {
/* Waning: adjust #UVStretchAngle struct accordingly. */
GPU_vertformat_attr_add(&format, "angle", GPU_COMP_I16, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
GPU_vertformat_attr_add(&format, "uv_angles", GPU_COMP_I16, 2, GPU_FETCH_INT_TO_FLOAT_UNIT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len);
MeshExtract_StretchAngle_Data *data = static_cast<MeshExtract_StretchAngle_Data *>(tls_data);
data->vbo_data = (UVStretchAngle *)GPU_vertbuf_get_data(vbo);
/* Special iterator needed to save about half of the computing cost. */
if (mr->extract_type == MR_EXTRACT_BMESH) {
data->cd_ofs = CustomData_get_offset(&mr->bm->ldata, CD_MLOOPUV);
}
else {
BLI_assert(ELEM(mr->extract_type, MR_EXTRACT_MAPPED, MR_EXTRACT_MESH));
data->luv = (MLoopUV *)CustomData_get_layer(&mr->me->ldata, CD_MLOOPUV);
}
}
static void extract_edituv_stretch_angle_iter_poly_bm(const MeshRenderData *mr,
const BMFace *f,
const int UNUSED(f_index),
void *_data)
{
MeshExtract_StretchAngle_Data *data = static_cast<MeshExtract_StretchAngle_Data *>(_data);
float(*auv)[2] = data->auv, *last_auv = data->last_auv;
float(*av)[3] = data->av, *last_av = data->last_av;
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);
const MLoopUV *luv, *luv_next;
BMLoop *l_next = l_iter->next;
if (l_iter == BM_FACE_FIRST_LOOP(f)) {
/* First loop in face. */
BMLoop *l_tmp = l_iter->prev;
BMLoop *l_next_tmp = l_iter;
luv = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_tmp, data->cd_ofs);
luv_next = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_next_tmp, data->cd_ofs);
compute_normalize_edge_vectors(auv,
av,
luv->uv,
luv_next->uv,
bm_vert_co_get(mr, l_tmp->v),
bm_vert_co_get(mr, l_next_tmp->v));
/* Save last edge. */
copy_v2_v2(last_auv, auv[1]);
copy_v3_v3(last_av, av[1]);
}
if (l_next == BM_FACE_FIRST_LOOP(f)) {
/* Move previous edge. */
copy_v2_v2(auv[0], auv[1]);
copy_v3_v3(av[0], av[1]);
/* Copy already calculated last edge. */
copy_v2_v2(auv[1], last_auv);
copy_v3_v3(av[1], last_av);
}
else {
luv = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_iter, data->cd_ofs);
luv_next = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_next, data->cd_ofs);
compute_normalize_edge_vectors(auv,
av,
luv->uv,
luv_next->uv,
bm_vert_co_get(mr, l_iter->v),
bm_vert_co_get(mr, l_next->v));
}
edituv_get_edituv_stretch_angle(auv, av, &data->vbo_data[l_index]);
} while ((l_iter = l_iter->next) != l_first);
}
static void extract_edituv_stretch_angle_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int UNUSED(mp_index),
void *_data)
{
MeshExtract_StretchAngle_Data *data = static_cast<MeshExtract_StretchAngle_Data *>(_data);
const int ml_index_end = mp->loopstart + mp->totloop;
for (int ml_index = mp->loopstart; ml_index < ml_index_end; ml_index += 1) {
float(*auv)[2] = data->auv, *last_auv = data->last_auv;
float(*av)[3] = data->av, *last_av = data->last_av;
int l_next = ml_index + 1;
const MVert *v, *v_next;
if (ml_index == mp->loopstart) {
/* First loop in face. */
const int ml_index_last = ml_index_end - 1;
const int l_next_tmp = mp->loopstart;
v = &mr->mvert[mr->mloop[ml_index_last].v];
v_next = &mr->mvert[mr->mloop[l_next_tmp].v];
compute_normalize_edge_vectors(
auv, av, data->luv[ml_index_last].uv, data->luv[l_next_tmp].uv, v->co, v_next->co);
/* Save last edge. */
copy_v2_v2(last_auv, auv[1]);
copy_v3_v3(last_av, av[1]);
}
if (l_next == ml_index_end) {
l_next = mp->loopstart;
/* Move previous edge. */
copy_v2_v2(auv[0], auv[1]);
copy_v3_v3(av[0], av[1]);
/* Copy already calculated last edge. */
copy_v2_v2(auv[1], last_auv);
copy_v3_v3(av[1], last_av);
}
else {
v = &mr->mvert[mr->mloop[ml_index].v];
v_next = &mr->mvert[mr->mloop[l_next].v];
compute_normalize_edge_vectors(
auv, av, data->luv[ml_index].uv, data->luv[l_next].uv, v->co, v_next->co);
}
edituv_get_edituv_stretch_angle(auv, av, &data->vbo_data[ml_index]);
}
}
constexpr MeshExtract create_extractor_edituv_edituv_stretch_angle()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_edituv_stretch_angle_init;
extractor.iter_poly_bm = extract_edituv_stretch_angle_iter_poly_bm;
extractor.iter_poly_mesh = extract_edituv_stretch_angle_iter_poly_mesh;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(MeshExtract_StretchAngle_Data);
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.edituv_stretch_angle);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_edituv_stretch_angle =
blender::draw::create_extractor_edituv_edituv_stretch_angle();
}
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