mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-29 16:22:53 +00:00
77 lines
3.1 KiB
C++
77 lines
3.1 KiB
C++
|
/********************************************************************************
|
||
|
|
* *
|
||
|
|
* This file is part of IfcOpenShell. *
|
||
|
|
* *
|
||
|
|
* IfcOpenShell is free software: you can redistribute it and/or modify *
|
||
|
|
* it under the terms of the Lesser GNU General Public License as published by *
|
||
|
|
* the Free Software Foundation, either version 3.0 of the License, or *
|
||
|
|
* (at your option) any later version. *
|
||
|
|
* *
|
||
|
|
* IfcOpenShell is distributed in the hope that it will be useful, *
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
|
||
|
|
* Lesser GNU General Public License for more details. *
|
||
|
|
* *
|
||
|
|
* You should have received a copy of the Lesser GNU General Public License *
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
|
||
|
|
* *
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
#ifndef SIDECARCACHE_H
|
||
|
|
#define SIDECARCACHE_H
|
||
|
|
|
||
|
|
#include "BvhAccel.h"
|
||
|
|
|
||
|
|
#include <cstdint>
|
||
|
|
#include <optional>
|
||
|
|
#include <string>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
static constexpr uint32_t SIDECAR_MAGIC = 0x49465657; // "IFVW"
|
||
|
|
static constexpr uint32_t SIDECAR_VERSION = 3;
|
||
|
|
static constexpr uint32_t SIDECAR_ENDIAN = 0x01020304;
|
||
|
|
|
||
|
|
// Fixed-size element record for the sidecar. Strings are stored as
|
||
|
|
// (offset, length) pairs into a separate string table.
|
||
|
|
struct PackedElementInfo {
|
||
|
|
uint32_t object_id;
|
||
|
|
uint32_t model_id;
|
||
|
|
int32_t ifc_id;
|
||
|
|
int32_t parent_id;
|
||
|
|
uint32_t guid_offset;
|
||
|
|
uint32_t guid_length;
|
||
|
|
uint32_t name_offset;
|
||
|
|
uint32_t name_length;
|
||
|
|
uint32_t type_offset;
|
||
|
|
uint32_t type_length;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Everything the viewer needs to display a model without tessellating.
|
||
|
|
struct SidecarData {
|
||
|
|
// GPU geometry (ready to upload as-is)
|
||
|
|
std::vector<float> vertices; // interleaved, 8 floats per vertex
|
||
|
|
std::vector<uint32_t> indices; // global (already remapped)
|
||
|
|
|
||
|
|
// Per-object metadata
|
||
|
|
std::vector<ObjectDrawInfo> draw_info;
|
||
|
|
|
||
|
|
// Element tree metadata
|
||
|
|
std::vector<PackedElementInfo> elements;
|
||
|
|
std::string string_table; // concatenated UTF-8
|
||
|
|
|
||
|
|
// BVH acceleration
|
||
|
|
std::shared_ptr<BvhSet> bvh_set;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Write a full sidecar next to the IFC file.
|
||
|
|
// Returns true on success.
|
||
|
|
bool writeSidecar(const std::string& ifc_path,
|
||
|
|
const SidecarData& data,
|
||
|
|
uint64_t ifc_file_size);
|
||
|
|
|
||
|
|
// Read a sidecar. Returns nullopt on any failure (missing, stale, corrupt).
|
||
|
|
std::optional<SidecarData> readSidecar(const std::string& ifc_path,
|
||
|
|
uint64_t ifc_file_size);
|
||
|
|
|
||
|
|
#endif // SIDECARCACHE_H
|