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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#include "extract_mesh.hh"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Orco
* \{ */
struct MeshExtract_Orco_Data {
float (*vbo_data)[4];
const float (*orco)[3];
};
static void extract_orco_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) {
/* FIXME(fclem): We use the last component as a way to differentiate from generic vertex
* attributes. This is a substantial waste of video-ram and should be done another way.
* Unfortunately, at the time of writing, I did not found any other "non disruptive"
* alternative. */
GPU_vertformat_attr_add(&format, "orco", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len);
CustomData *cd_vdata = &mr->me->vdata;
MeshExtract_Orco_Data *data = static_cast<MeshExtract_Orco_Data *>(tls_data);
data->vbo_data = (float(*)[4])GPU_vertbuf_get_data(vbo);
data->orco = static_cast<const float(*)[3]>(CustomData_get_layer(cd_vdata, CD_ORCO));
/* Make sure `orco` layer was requested only if needed! */
BLI_assert(data->orco);
}
static void extract_orco_iter_poly_bm(const MeshRenderData *UNUSED(mr),
const BMFace *f,
const int UNUSED(f_index),
void *data)
{
MeshExtract_Orco_Data *orco_data = (MeshExtract_Orco_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);
float *loop_orco = orco_data->vbo_data[l_index];
copy_v3_v3(loop_orco, orco_data->orco[BM_elem_index_get(l_iter->v)]);
loop_orco[3] = 0.0; /* Tag as not a generic attribute. */
} while ((l_iter = l_iter->next) != l_first);
}
static void extract_orco_iter_poly_mesh(const MeshRenderData *mr,
const MPoly *mp,
const int UNUSED(mp_index),
void *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];
MeshExtract_Orco_Data *orco_data = (MeshExtract_Orco_Data *)data;
float *loop_orco = orco_data->vbo_data[ml_index];
copy_v3_v3(loop_orco, orco_data->orco[ml->v]);
loop_orco[3] = 0.0; /* Tag as not a generic attribute. */
}
}
constexpr MeshExtract create_extractor_orco()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_orco_init;
extractor.iter_poly_bm = extract_orco_iter_poly_bm;
extractor.iter_poly_mesh = extract_orco_iter_poly_mesh;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = sizeof(MeshExtract_Orco_Data);
extractor.use_threading = true;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.orco);
return extractor;
}
/** \} */
} // namespace blender::draw
const MeshExtract extract_orco = blender::draw::create_extractor_orco();
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