1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* 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 "draw_cache_extract_mesh_private.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Edit UV area stretch
* \{ */
static void extract_edituv_stretch_area_init(const MeshRenderData *mr,
struct MeshBatchCache *UNUSED(cache),
void *buf,
void *UNUSED(tls_data))
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "ratio", GPU_COMP_I16, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len);
}
BLI_INLINE float area_ratio_get(float area, float uvarea)
{
if (area >= FLT_EPSILON && uvarea >= FLT_EPSILON) {
/* Tag inversion by using the sign. */
return (area > uvarea) ? (uvarea / area) : -(area / uvarea);
}
return 0.0f;
}
BLI_INLINE float area_ratio_to_stretch(float ratio, float tot_ratio, float inv_tot_ratio)
{
ratio *= (ratio > 0.0f) ? tot_ratio : -inv_tot_ratio;
return (ratio > 1.0f) ? (1.0f / ratio) : ratio;
}
static void extract_edituv_stretch_area_finish(const MeshRenderData *mr,
struct MeshBatchCache *cache,
void *buf,
void *UNUSED(data))
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
float tot_area = 0.0f, tot_uv_area = 0.0f;
float *area_ratio = static_cast<float *>(MEM_mallocN(sizeof(float) * mr->poly_len, __func__));
if (mr->extract_type == MR_EXTRACT_BMESH) {
CustomData *cd_ldata = &mr->bm->ldata;
int uv_ofs = CustomData_get_offset(cd_ldata, CD_MLOOPUV);
BMFace *efa;
BMIter f_iter;
int f;
BM_ITER_MESH_INDEX (efa, &f_iter, mr->bm, BM_FACES_OF_MESH, f) {
float area = BM_face_calc_area(efa);
float uvarea = BM_face_calc_area_uv(efa, uv_ofs);
tot_area += area;
tot_uv_area += uvarea;
area_ratio[f] = area_ratio_get(area, uvarea);
}
}
else {
BLI_assert(ELEM(mr->extract_type, MR_EXTRACT_MAPPED, MR_EXTRACT_MESH));
const MLoopUV *uv_data = (const MLoopUV *)CustomData_get_layer(&mr->me->ldata, CD_MLOOPUV);
const MPoly *mp = mr->mpoly;
for (int mp_index = 0; mp_index < mr->poly_len; mp_index++, mp++) {
float area = BKE_mesh_calc_poly_area(mp, &mr->mloop[mp->loopstart], mr->mvert);
float uvarea = BKE_mesh_calc_poly_uv_area(mp, uv_data);
tot_area += area;
tot_uv_area += uvarea;
area_ratio[mp_index] = area_ratio_get(area, uvarea);
}
}
cache->tot_area = tot_area;
cache->tot_uv_area = tot_uv_area;
/* Convert in place to avoid an extra allocation */
uint16_t *poly_stretch = (uint16_t *)area_ratio;
for (int mp_index = 0; mp_index < mr->poly_len; mp_index++) {
poly_stretch[mp_index] = area_ratio[mp_index] * SHRT_MAX;
}
/* Copy face data for each loop. */
uint16_t *loop_stretch = (uint16_t *)GPU_vertbuf_get_data(vbo);
if (mr->extract_type == MR_EXTRACT_BMESH) {
BMFace *efa;
BMIter f_iter;
int f, l_index = 0;
BM_ITER_MESH_INDEX (efa, &f_iter, mr->bm, BM_FACES_OF_MESH, f) {
for (int i = 0; i < efa->len; i++, l_index++) {
loop_stretch[l_index] = poly_stretch[f];
}
}
}
else {
BLI_assert(ELEM(mr->extract_type, MR_EXTRACT_MAPPED, MR_EXTRACT_MESH));
const MPoly *mp = mr->mpoly;
for (int mp_index = 0, l_index = 0; mp_index < mr->poly_len; mp_index++, mp++) {
for (int i = 0; i < mp->totloop; i++, l_index++) {
loop_stretch[l_index] = poly_stretch[mp_index];
}
}
}
MEM_freeN(area_ratio);
}
constexpr MeshExtract create_extractor_edituv_stretch_area()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_edituv_stretch_area_init;
extractor.finish = extract_edituv_stretch_area_finish;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = 0;
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.edituv_stretch_area);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_edituv_stretch_area =
blender::draw::create_extractor_edituv_stretch_area();
}
|
