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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 Skin Modifier Roots
* \{ */
struct SkinRootData {
float size;
float local_pos[3];
};
static void extract_skin_roots_init(const MeshRenderData *mr,
MeshBatchCache *UNUSED(cache),
void *buf,
void *UNUSED(tls_data))
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
/* Exclusively for edit mode. */
BLI_assert(mr->bm);
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "size", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
GPU_vertformat_attr_add(&format, "local_pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->bm->totvert);
SkinRootData *vbo_data = (SkinRootData *)GPU_vertbuf_get_data(vbo);
int root_len = 0;
int cd_ofs = CustomData_get_offset(&mr->bm->vdata, CD_MVERT_SKIN);
BMIter iter;
BMVert *eve;
BM_ITER_MESH (eve, &iter, mr->bm, BM_VERTS_OF_MESH) {
const MVertSkin *vs = (const MVertSkin *)BM_ELEM_CD_GET_VOID_P(eve, cd_ofs);
if (vs->flag & MVERT_SKIN_ROOT) {
vbo_data->size = (vs->radius[0] + vs->radius[1]) * 0.5f;
copy_v3_v3(vbo_data->local_pos, bm_vert_co_get(mr, eve));
vbo_data++;
root_len++;
}
}
/* It's really unlikely that all verts will be roots. Resize to avoid losing VRAM. */
GPU_vertbuf_data_len_set(vbo, root_len);
}
constexpr MeshExtract create_extractor_skin_roots()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_skin_roots_init;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = 0;
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.skin_roots);
return extractor;
}
/** \} */
} // namespace blender::draw
const MeshExtract extract_skin_roots = blender::draw::create_extractor_skin_roots();
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