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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 "GPU_capabilities.h"
#include "draw_cache_extract_mesh_private.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Edge Factor
* Defines how much an edge is visible.
* \{ */
struct MeshExtract_EdgeFac_Data {
uchar *vbo_data;
bool use_edge_render;
/* Number of loop per edge. */
uchar *edge_loop_count;
};
static float loop_edge_factor_get(const float f_no[3],
const float v_co[3],
const float v_no[3],
const float v_next_co[3])
{
float enor[3], evec[3];
sub_v3_v3v3(evec, v_next_co, v_co);
cross_v3_v3v3(enor, v_no, evec);
normalize_v3(enor);
float d = fabsf(dot_v3v3(enor, f_no));
/* Re-scale to the slider range. */
d *= (1.0f / 0.065f);
CLAMP(d, 0.0f, 1.0f);
return d;
}
static void extract_edge_fac_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, "wd", GPU_COMP_U8, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len + mr->loop_loose_len);
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(tls_data);
if (mr->extract_type == MR_EXTRACT_MESH) {
data->edge_loop_count = static_cast<uchar *>(
MEM_callocN(sizeof(uint32_t) * mr->edge_len, __func__));
/* HACK(fclem) Detecting the need for edge render.
* We could have a flag in the mesh instead or check the modifier stack. */
const MEdge *med = mr->medge;
for (int e_index = 0; e_index < mr->edge_len; e_index++, med++) {
if ((med->flag & ME_EDGERENDER) == 0) {
data->use_edge_render = true;
break;
}
}
}
else {
/* HACK to bypass non-manifold check in mesh_edge_fac_finish(). */
data->use_edge_render = true;
}
data->vbo_data = static_cast<uchar *>(GPU_vertbuf_get_data(vbo));
}
static void extract_edge_fac_iter_poly_bm(const MeshRenderData *mr,
const BMFace *f,
const int UNUSED(f_index),
void *_data)
{
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_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 (BM_edge_is_manifold(l_iter->e)) {
float ratio = loop_edge_factor_get(bm_face_no_get(mr, f),
bm_vert_co_get(mr, l_iter->v),
bm_vert_no_get(mr, l_iter->v),
bm_vert_co_get(mr, l_iter->next->v));
data->vbo_data[l_index] = ratio * 253 + 1;
}
else {
data->vbo_data[l_index] = 255;
}
} while ((l_iter = l_iter->next) != l_first);
}
static void extract_edge_fac_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int mp_index,
void *_data)
{
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_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->use_edge_render) {
const MEdge *med = &mr->medge[ml->e];
data->vbo_data[ml_index] = (med->flag & ME_EDGERENDER) ? 255 : 0;
}
else {
/* Count loop per edge to detect non-manifold. */
if (data->edge_loop_count[ml->e] < 3) {
data->edge_loop_count[ml->e]++;
}
if (data->edge_loop_count[ml->e] == 2) {
/* Manifold */
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);
const MLoop *ml_next = &mr->mloop[ml_index_other];
const MVert *v1 = &mr->mvert[ml->v];
const MVert *v2 = &mr->mvert[ml_next->v];
float vnor_f[3];
normal_short_to_float_v3(vnor_f, v1->no);
float ratio = loop_edge_factor_get(mr->poly_normals[mp_index], v1->co, vnor_f, v2->co);
data->vbo_data[ml_index] = ratio * 253 + 1;
}
else {
/* Non-manifold */
data->vbo_data[ml_index] = 255;
}
}
}
}
static void extract_edge_fac_iter_ledge_bm(const MeshRenderData *mr,
const BMEdge *UNUSED(eed),
const int ledge_index,
void *_data)
{
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data);
data->vbo_data[mr->loop_len + (ledge_index * 2) + 0] = 255;
data->vbo_data[mr->loop_len + (ledge_index * 2) + 1] = 255;
}
static void extract_edge_fac_iter_ledge_mesh(const MeshRenderData *mr,
const MEdge *UNUSED(med),
const int ledge_index,
void *_data)
{
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data);
data->vbo_data[mr->loop_len + ledge_index * 2 + 0] = 255;
data->vbo_data[mr->loop_len + ledge_index * 2 + 1] = 255;
}
static void extract_edge_fac_finish(const MeshRenderData *mr,
struct MeshBatchCache *UNUSED(cache),
void *buf,
void *_data)
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
MeshExtract_EdgeFac_Data *data = static_cast<MeshExtract_EdgeFac_Data *>(_data);
if (GPU_crappy_amd_driver()) {
/* Some AMD drivers strangely crash with VBO's with a one byte format.
* To workaround we reinitialize the VBO with another format and convert
* all bytes to floats. */
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "wd", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
}
/* We keep the data reference in data->vbo_data. */
data->vbo_data = static_cast<uchar *>(GPU_vertbuf_steal_data(vbo));
GPU_vertbuf_clear(vbo);
int buf_len = mr->loop_len + mr->loop_loose_len;
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, buf_len);
float *fdata = (float *)GPU_vertbuf_get_data(vbo);
for (int ml_index = 0; ml_index < buf_len; ml_index++, fdata++) {
*fdata = data->vbo_data[ml_index] / 255.0f;
}
/* Free old byte data. */
MEM_freeN(data->vbo_data);
}
MEM_SAFE_FREE(data->edge_loop_count);
}
constexpr MeshExtract create_extractor_edge_fac()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_edge_fac_init;
extractor.iter_poly_bm = extract_edge_fac_iter_poly_bm;
extractor.iter_poly_mesh = extract_edge_fac_iter_poly_mesh;
extractor.iter_ledge_bm = extract_edge_fac_iter_ledge_bm;
extractor.iter_ledge_mesh = extract_edge_fac_iter_ledge_mesh;
extractor.finish = extract_edge_fac_finish;
extractor.data_type = MR_DATA_POLY_NOR;
extractor.data_size = sizeof(MeshExtract_EdgeFac_Data);
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.edge_fac);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_edge_fac = blender::draw::create_extractor_edge_fac();
}
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