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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup stl
*/
#include <cstdint>
#include <cstdio>
#include "BKE_main.h"
#include "BKE_mesh.h"
#include "BLI_array.hh"
#include "BLI_memory_utils.hh"
#include "DNA_mesh_types.h"
#include "stl_import.hh"
#include "stl_import_binary_reader.hh"
#include "stl_import_mesh.hh"
namespace blender::io::stl {
#pragma pack(push, 1)
struct STLBinaryTriangle {
float normal[3];
float v1[3], v2[3], v3[3];
uint16_t attribute_byte_count;
};
#pragma pack(pop)
Mesh *read_stl_binary(FILE *file, Main *bmain, char *mesh_name, bool use_custom_normals)
{
const int chunk_size = 1024;
uint32_t num_tris = 0;
fseek(file, BINARY_HEADER_SIZE, SEEK_SET);
if (fread(&num_tris, sizeof(uint32_t), 1, file) != 1) {
stl_import_report_error(file);
return nullptr;
}
if (num_tris == 0) {
return BKE_mesh_add(bmain, mesh_name);
}
Array<STLBinaryTriangle> tris_buf(chunk_size);
STLMeshHelper stl_mesh(num_tris, use_custom_normals);
size_t num_read_tris;
while ((num_read_tris = fread(tris_buf.data(), sizeof(STLBinaryTriangle), chunk_size, file))) {
for (size_t i = 0; i < num_read_tris; i++) {
if (use_custom_normals) {
stl_mesh.add_triangle(tris_buf[i].v1, tris_buf[i].v2, tris_buf[i].v3, tris_buf[i].normal);
}
else {
stl_mesh.add_triangle(tris_buf[i].v1, tris_buf[i].v2, tris_buf[i].v3);
}
}
}
return stl_mesh.to_mesh(bmain, mesh_name);
}
} // namespace blender::io::stl
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