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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#include "BLI_bitmap.h"
#include "extract_mesh.hh"
#include "draw_subdivision.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Face-dots positions
* \{ */
static GPUVertFormat *get_fdots_pos_format()
{
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
}
return &format;
}
static GPUVertFormat *get_fdots_nor_format_subdiv()
{
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "norAndFlag", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
}
return &format;
}
static void extract_fdots_pos_init(const MeshRenderData *mr,
MeshBatchCache * /*cache*/,
void *buf,
void *tls_data)
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
GPUVertFormat *format = get_fdots_pos_format();
GPU_vertbuf_init_with_format(vbo, format);
GPU_vertbuf_data_alloc(vbo, mr->poly_len);
void *vbo_data = GPU_vertbuf_get_data(vbo);
*(float(**)[3])tls_data = static_cast<float(*)[3]>(vbo_data);
}
static void extract_fdots_pos_iter_poly_bm(const MeshRenderData *mr,
const BMFace *f,
const int f_index,
void *data)
{
float(*center)[3] = *static_cast<float(**)[3]>(data);
float *co = center[f_index];
zero_v3(co);
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
add_v3_v3(co, bm_vert_co_get(mr, l_iter->v));
} while ((l_iter = l_iter->next) != l_first);
mul_v3_fl(co, 1.0f / float(f->len));
}
static void extract_fdots_pos_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int mp_index,
void *data)
{
float(*center)[3] = *static_cast<float(**)[3]>(data);
float *co = center[mp_index];
zero_v3(co);
const MVert *mvert = mr->mvert;
const MLoop *mloop = mr->mloop;
const BLI_bitmap *facedot_tags = mr->me->runtime->subsurf_face_dot_tags;
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 (mr->use_subsurf_fdots) {
if (BLI_BITMAP_TEST(facedot_tags, ml->v)) {
copy_v3_v3(center[mp_index], mvert[ml->v].co);
break;
}
}
else {
const MVert *mv = &mvert[ml->v];
add_v3_v3(center[mp_index], mv->co);
}
}
if (!mr->use_subsurf_fdots) {
mul_v3_fl(co, 1.0f / float(mp->totloop));
}
}
static void extract_fdots_init_subdiv(const DRWSubdivCache *subdiv_cache,
const MeshRenderData * /*mr*/,
MeshBatchCache *cache,
void *buffer,
void * /*data*/)
{
/* We "extract" positions, normals, and indices at once. */
GPUVertBuf *fdots_pos_vbo = static_cast<GPUVertBuf *>(buffer);
GPUVertBuf *fdots_nor_vbo = cache->final.buff.vbo.fdots_nor;
GPUIndexBuf *fdots_pos_ibo = cache->final.buff.ibo.fdots;
/* The normals may not be requested. */
if (fdots_nor_vbo) {
GPU_vertbuf_init_build_on_device(
fdots_nor_vbo, get_fdots_nor_format_subdiv(), subdiv_cache->num_coarse_poly);
}
GPU_vertbuf_init_build_on_device(
fdots_pos_vbo, get_fdots_pos_format(), subdiv_cache->num_coarse_poly);
GPU_indexbuf_init_build_on_device(fdots_pos_ibo, subdiv_cache->num_coarse_poly);
draw_subdiv_build_fdots_buffers(subdiv_cache, fdots_pos_vbo, fdots_nor_vbo, fdots_pos_ibo);
}
constexpr MeshExtract create_extractor_fdots_pos()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_fdots_pos_init;
extractor.init_subdiv = extract_fdots_init_subdiv;
extractor.iter_poly_bm = extract_fdots_pos_iter_poly_bm;
extractor.iter_poly_mesh = extract_fdots_pos_iter_poly_mesh;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(float(*)[3]);
extractor.use_threading = true;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.fdots_pos);
return extractor;
}
/** \} */
} // namespace blender::draw
const MeshExtract extract_fdots_pos = blender::draw::create_extractor_fdots_pos();
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