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137 lines
5.2 KiB
Markdown
137 lines
5.2 KiB
Markdown
# Dependency weight of the Design/CAD subsystem
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What the Design tab actually costs a maintainer who merges it. Written to be checkable:
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every number below is reproducible with the command that produced it, and the places where
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a number is still missing say so instead of guessing.
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Measured on Linux x86_64, OCCT V7_6_0, in the `snaporca-deps` build image.
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## Summary
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| | Cost |
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| New third-party dependencies | **none** |
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| OCCT build flag | `BUILD_MODULE_ModelingAlgorithms=ON` |
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| Extra OCCT toolkits *built* | 3 (TKFillet, TKOffset, TKFeat) |
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| Extra OCCT toolkits *linked* | 2 (TKFillet, TKOffset) |
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| Vendored code | `src/libslic3r/slvs`, 9,339 lines, 380 KiB, GPLv3 |
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| Own object code | 6.79 MiB unstripped `.o` (7.13 MiB with the solver) |
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OCCT is **already** an upstream dependency — Orca uses it for STEP import. The Design tab
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does not add a library; it turns on one more OCCT module.
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## The OCCT module flag
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`deps/OCCT/OCCT.cmake` gates the module on `SLIC3R_CAD`:
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```cmake
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-DBUILD_MODULE_ModelingAlgorithms=${SLIC3R_CAD} # was hard-coded OFF
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```
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With `SLIC3R_CAD=OFF` the deps prefix matches upstream exactly.
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`ModelingAlgorithms` contains 12 toolkits, but **most were already being built**, because
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`DataExchange` — the STEP path upstream already ships — depends on them. The honest delta is
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only the toolkits that DataExchange's dependency closure does *not* reach:
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```
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ModelingAlgorithms = TKGeomAlgo TKTopAlgo TKPrim TKBO TKBool TKHLR
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TKFillet TKOffset TKFeat TKMesh TKXMesh TKShHealing
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already required by DataExchange: TKBO TKBool TKGeomAlgo TKHLR TKMesh
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TKPrim TKShHealing TKTopAlgo
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true delta: TKFeat TKFillet TKOffset TKXMesh
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```
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Reproduce by walking `adm/MODULES` and each toolkit's `src/<TK>/EXTERNLIB` in the OCCT
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source tree.
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### Sizes of the delta toolkits
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Static archives in the deps prefix. These are *build artifacts*, not shipped bytes — a
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static link pulls in only the objects it references:
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| Toolkit | Archive | Referenced by the Design tab? |
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| TKFillet | 7.40 MiB | yes — `BRepFilletAPI` |
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| TKOffset | 5.38 MiB | yes — `BRepOffsetAPI`, `BRepOffset_` |
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| TKFeat | 4.42 MiB | **no** |
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| TKXMesh | — | not produced at all |
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TKFeat is worth calling out: nothing in the Design tab references it, and it is absent from
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the `TKFillet`/`TKOffset` dependency closure, so it is built for nothing. OCCT's module flag
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is all-or-nothing per module, which is why it comes along. It costs build time and zero
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shipped bytes on any platform that links OCCT statically.
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**A correction to the record.** The comment in `deps/OCCT/OCCT.cmake` and the earlier
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summary both said the delta was "TKFillet + TKOffset — 3.77 MiB, Windows only". The toolkit
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list was incomplete: TKFeat is built too. The 3.77 MiB figure covers 2 of the 3 built
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toolkits and has not been re-derived here — see the gap below.
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## What is not measured yet
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Two numbers a maintainer may reasonably ask for are **not** in this document, because
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producing them honestly needs a build this machine cannot do:
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1. **Windows DLL delta.** OCCT builds shared on Windows, so the shipped cost there is real
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DLL bytes rather than linker-selected objects. That needs a Windows build to size —
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tracked as the cross-platform build proof (`snaporca-gix`).
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2. **Clean-build time delta.** Measuring it means building the deps prefix twice, with the
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flag ON and OFF, on the same machine. The incremental figures from day-to-day work do not
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answer the question and are not offered as if they did.
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Do not quote a number for either until it has been measured.
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## Vendored solver
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`src/libslic3r/slvs` — the 2D sketch constraint solver extracted from SolveSpace.
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- 19 files: 8 `.cpp`, 11 `.h`, plus `LICENSE`
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- 9,339 lines, 380 KiB of source, 0.34 MiB of object code
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- **GPLv3**, `LICENSE` preserved verbatim in the vendored directory
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The fork is **AGPLv3**. GPLv3 code combines into an AGPLv3 work without difficulty: AGPLv3
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§13 provides explicit compatibility in that direction. No licence question to resolve.
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It is live code, not a carried corpse — `SketchSolver.cpp` is its only consumer and drives
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every sketch constraint in the Design tab.
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## Own code
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Object sizes from the release build (unstripped, so these include debug information and
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overstate the shipped contribution):
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| Object | Size |
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| DesignPanel.o | 2.22 MiB |
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| McpControl.o | 1.69 MiB |
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| DesignSketchTool.o | 0.88 MiB |
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| CadDocument.o | 0.76 MiB |
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| SketchEngine.o | 0.40 MiB |
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| DesignCanvas.o | 0.37 MiB |
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| GeometryEngine.o | 0.32 MiB |
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| SketchSolver.o | 0.15 MiB |
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| slvs (all objects) | 0.34 MiB |
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| **total** | **7.13 MiB** |
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For scale, the linked binary is 137.1 MiB.
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## Reproducing
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```bash
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# toolkit membership and dependency closure
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R=<occt-source>
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cat $R/adm/MODULES # module -> toolkits
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cat $R/src/<TK>/EXTERNLIB # toolkit -> its dependencies
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# archive sizes
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ls -l <deps-prefix>/lib/libTK{Fillet,Offset,Feat}.a
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# what the Design tab actually references
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grep -rE 'BRepFilletAPI|BRepOffsetAPI|BRepOffset_|BRepFeat' src/libslic3r/
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# vendored solver
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wc -l src/libslic3r/slvs/*.cpp src/libslic3r/slvs/**/*.h
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head -3 src/libslic3r/slvs/LICENSE
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```
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