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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"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Face-dots UV
* \{ */
struct MeshExtract_FdotUV_Data {
float (*vbo_data)[2];
const MLoopUV *uv_data;
int cd_ofs;
};
static void extract_fdots_uv_init(const MeshRenderData *mr,
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, "u", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
GPU_vertformat_alias_add(&format, "au");
GPU_vertformat_alias_add(&format, "pos");
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->poly_len);
if (!mr->use_subsurf_fdots) {
/* Clear so we can accumulate on it. */
memset(GPU_vertbuf_get_data(vbo), 0x0, mr->poly_len * GPU_vertbuf_get_format(vbo)->stride);
}
MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(tls_data);
data->vbo_data = (float(*)[2])GPU_vertbuf_get_data(vbo);
if (mr->extract_type == MR_EXTRACT_BMESH) {
data->cd_ofs = CustomData_get_offset(&mr->bm->ldata, CD_MLOOPUV);
}
else {
data->uv_data = (const MLoopUV *)CustomData_get_layer(&mr->me->ldata, CD_MLOOPUV);
}
}
static void extract_fdots_uv_iter_poly_bm(const MeshRenderData *UNUSED(mr),
const BMFace *f,
const int UNUSED(f_index),
void *_data)
{
MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(_data);
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
float w = 1.0f / (float)f->len;
const MLoopUV *luv = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_iter, data->cd_ofs);
madd_v2_v2fl(data->vbo_data[BM_elem_index_get(f)], luv->uv, w);
} while ((l_iter = l_iter->next) != l_first);
}
static void extract_fdots_uv_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int mp_index,
void *_data)
{
MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(_data);
const BLI_bitmap *facedot_tags = mr->me->runtime.subsurf_face_dot_tags;
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 (mr->use_subsurf_fdots) {
if (BLI_BITMAP_TEST(facedot_tags, ml->v)) {
copy_v2_v2(data->vbo_data[mp_index], data->uv_data[ml_index].uv);
}
}
else {
float w = 1.0f / (float)mp->totloop;
madd_v2_v2fl(data->vbo_data[mp_index], data->uv_data[ml_index].uv, w);
}
}
}
constexpr MeshExtract create_extractor_fdots_uv()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_fdots_uv_init;
extractor.iter_poly_bm = extract_fdots_uv_iter_poly_bm;
extractor.iter_poly_mesh = extract_fdots_uv_iter_poly_mesh;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(MeshExtract_FdotUV_Data);
extractor.use_threading = true;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.fdots_uv);
return extractor;
}
/** \} */
} // namespace blender::draw
const MeshExtract extract_fdots_uv = blender::draw::create_extractor_fdots_uv();
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