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https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
7f29850022
InstanceCpu now carries both placement_transformation (raw streamer
output, the iterator's per-shape transform with vertex-rebasing offset
folded in) and transform (the composed FederatedFalseOrigin ·
ModelTransformation · CoordinateOperation · placement_transformation
result that lands in the SSBO). World AABBs are recomputed from the
composed transform — frustum/BVH culling sees the actual rendered
position regardless of stage state.
ViewportWindow gains:
- ModelGpuData::coordinate_operation_meters / model_transformation_meters
- federated_false_origin_meters_ (federation-wide member)
- composeInstanceFromPlacement / recomposeAndUploadModel helpers
- public setFederatedFalseOrigin / setModelCoordinateOperation /
setModelTransformation
Each setter rewrites the affected model's SSBO, refreshes the
reflection flags, and rebuilds the BVH. Defaults are identity, so
behaviour is unchanged until something wires a setter up — that's
the next commit (MainWindow listening to Federation::dirtyChanged
and SceneLoader::modelGeoref ready signals).
Sidecar bumped 9 -> 10: InstanceCpu grew 104 B -> 168 B. Existing
sidecars rebuild on next load. v10 sidecars store
placement_transformation, so they remain reusable across .ifcfeds —
the composed transform on disk is overwritten with the right one
on load.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
99 lines
4.8 KiB
C++
99 lines
4.8 KiB
C++
/********************************************************************************
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* *
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* This file is part of IfcOpenShell. *
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* *
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* IfcOpenShell is free software: you can redistribute it and/or modify *
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* it under the terms of the Lesser GNU General Public License as published by *
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* the Free Software Foundation, either version 3.0 of the License, or *
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* (at your option) any later version. *
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* *
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* IfcOpenShell is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* Lesser GNU General Public License for more details. *
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* *
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* You should have received a copy of the Lesser GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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* *
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********************************************************************************/
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// NOTE: Sidecar format v3 is being rewritten to v4 (instanced geometry layout).
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// During the instancing rewrite (Commit A) the cache is a no-op: reads always
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// miss and writes always succeed without producing a file. Commit B will
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// re-introduce the on-disk format with MeshInfo + InstanceGpu sections.
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#ifndef SIDECARCACHE_H
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#define SIDECARCACHE_H
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#include "InstancedGeometry.h"
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <vector>
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#include <memory>
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static constexpr uint32_t SIDECAR_MAGIC = 0x49465657; // "IFVW"
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// v5 = MeshInfo extended with lod1_ebo_byte_offset + lod1_index_count (56 B).
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// sd.indices may contain an appended LOD1 index slice for each mesh
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// where meshoptimizer decimation produced useful output.
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// v6 = VBO vertices quantized to 16 B/vertex (pos u16x3 + normal oct i16x2 +
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// color u8x4). Dequant basis is per-mesh MeshInfo.local_aabb_min/max.
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// v7 = VBO vertices shrunk to 12 B/vertex (normal oct i8x2 replaces i16x2,
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// eliminating 2-byte pad + saving 2 bytes on normal).
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// v8 = source_file_size field dropped from header. Sidecar is keyed purely
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// on path stem (foo.ifc and foo.ifcdb/ both map to foo.ifcview) so the
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// same cache serves either source format. Staleness is user-managed
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// (delete the sidecar to force a rebuild).
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// v9 = unused `reserved` field dropped from header (16 B -> 12 B).
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// v10 = InstanceCpu gains placement_transformation[16] alongside transform[16]
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// — record grew from 104 B to 168 B. placement_transformation is the
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// raw streamer output; transform is the composed FederatedFalseOrigin ·
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// ModelTransformation · CoordinateOperation · placement_transformation
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// result. Sidecar serialises both; on load the transform is recomputed
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// from placement_transformation + the ViewportWindow's current stage
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// matrices, so v10 sidecars are reusable across .ifcfeds.
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static constexpr uint32_t SIDECAR_VERSION = 10;
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static constexpr uint32_t SIDECAR_ENDIAN = 0x01020304;
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// Fixed-size element record. Strings are stored as (offset, length) pairs
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// into a separate string table.
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struct PackedElementInfo {
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uint32_t object_id;
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uint32_t model_id;
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int32_t ifc_id;
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int32_t parent_id;
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uint32_t guid_offset;
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uint32_t guid_length;
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uint32_t name_offset;
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uint32_t name_length;
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uint32_t type_offset;
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uint32_t type_length;
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};
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// Everything needed to display an already-tessellated model without
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// re-running the iterator. v6 schema: instanced + quantized geometry.
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struct SidecarData {
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// Per-model GPU geometry (local coords). Raw VBO bytes at the
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// INSTANCED_VERTEX_STRIDE_BYTES layout (12 B/vertex as of v7).
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std::vector<uint8_t> vertices;
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std::vector<uint32_t> indices;
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// Mesh dictionary and per-instance data.
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std::vector<MeshInfo> meshes; // indexed by local_mesh_id
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std::vector<InstanceCpu> instances; // sorted by mesh_id
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// Element tree metadata.
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std::vector<PackedElementInfo> elements;
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std::string string_table;
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};
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// Sidecar is keyed on the path stem: foo.ifc and foo.ifcdb/ both resolve to
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// foo.ifcview alongside the source. No staleness check — callers delete the
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// file to invalidate.
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bool writeSidecar(const std::string& ifc_path, const SidecarData& data);
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std::optional<SidecarData> readSidecar(const std::string& ifc_path);
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#endif // SIDECARCACHE_H
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