mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
e55a360aa2
First Emscripten target. main_web.cpp brings up a wgpu instance against
a <canvas id="viewer-canvas">, requests adapter+device asynchronously
via the standard webgpu.h callback chain, configures the surface, and
clears to the BonsaiViewer slate background on each RAF tick. No
sidecar load, no pipelines, no scene state yet — the goal is to end-
to-end verify the build + canvas + wgpu plumbing.
src/ifcviewer-web/ is a separate CMake root (not a subdir under the
desktop cmake/CMakeLists.txt) so the web build doesn't have to opt out
of Qt / OpenCASCADE / IfcGeom find_packages it can't satisfy. It adds
src/ifcviewer EXCLUDE_FROM_ALL and consumes only IfcViewerCore.
src/ifcviewer/CMakeLists.txt now gates the wgpu-native fetch + the
Qt-using IfcViewer target + install commands behind NOT EMSCRIPTEN.
The wgpu_native link target still resolves under Emscripten as an
INTERFACE library that activates --use-port=emdawnwebgpu (Dawn's
webgpu.h, replaces the legacy -sUSE_WEBGPU=1).
Build:
source path/to/emsdk_env.sh
emcmake cmake -S src/ifcviewer-web -B build-web -G Ninja
ninja -C build-web
python3 -m http.server --directory build-web 8080
# open http://localhost:8080/IfcViewerWeb.html in a WebGPU-capable
# browser (Chrome 113+, Edge 113+).
Phase B step 3 of #45.
99 lines
5.0 KiB
CMake
99 lines
5.0 KiB
CMake
################################################################################
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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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# Web (Emscripten + WebGPU) build root.
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#
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# This is a SEPARATE root from cmake/CMakeLists.txt — the desktop CMake
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# pulls in Qt, OpenCASCADE, IfcGeom, CGAL, Boost, none of which exist or
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# make sense for wasm. The web build only needs IfcViewerCore (the
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# Qt-free, OpenCASCADE-free static lib carved out of src/ifcviewer)
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# plus this main_web.cpp scaffold.
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#
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# Usage:
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# source /path/to/emsdk_env.sh
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# emcmake cmake -S src/ifcviewer-web -B build-web
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# ninja -C build-web
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# python3 -m http.server --directory build-web 8080
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# # open http://localhost:8080/IfcViewerWeb.html
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#
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# Why a separate root and not a sub-add under cmake/CMakeLists.txt:
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# making every find_package() conditional on (NOT EMSCRIPTEN) would
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# pollute the desktop build with web-only branches it never exercises.
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# Better to keep the web path's machinery local to this directory.
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cmake_minimum_required(VERSION 3.21)
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project(IfcViewerWeb LANGUAGES CXX)
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if(NOT EMSCRIPTEN)
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message(FATAL_ERROR
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"src/ifcviewer-web requires the Emscripten toolchain. "
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"Re-run via `emcmake cmake ...`.")
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endif()
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Allow find_package to look at the host system for header-only deps
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# (Eigen3 is the only one we need). Emscripten's CMake toolchain
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# defaults this to ONLY, which restricts searches to the emcc sysroot
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# and blocks the system Eigen3Config.cmake. Eigen is pure-header so
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# pulling its include path from the host is completely safe.
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set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
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# --- IfcViewerCore: portable runtime subset ----------------------------------
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#
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# Build IfcViewerCore by adding src/ifcviewer as a subdir. The Qt /
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# IfcGeom / OpenCASCADE-coupled IfcViewer target inside that CMakeLists
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# will fail under emcc (find_package(Qt6) etc. won't resolve), so the
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# subdir's full build can't be reached here. We add it with EXCLUDE_FROM_ALL
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# so only the targets we explicitly reference (IfcViewerCore) are built.
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# Eigen and wgpu_native (the latter becomes a no-op interface under
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# EMSCRIPTEN — see ifcviewer/CMakeLists.txt) get pulled in transitively.
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#
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# TODO(web): when src/ifcviewer/CMakeLists.txt is taught to skip the
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# Qt-using IfcViewer target under EMSCRIPTEN, we can drop EXCLUDE_FROM_ALL.
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set(IFCVIEWER_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../ifcviewer")
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add_subdirectory(${IFCVIEWER_DIR} ifcviewer EXCLUDE_FROM_ALL)
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# --- The web executable ------------------------------------------------------
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add_executable(IfcViewerWeb main_web.cpp)
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target_link_libraries(IfcViewerWeb PRIVATE IfcViewerCore)
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target_link_options(IfcViewerWeb PRIVATE
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# Asyncify lets us await wgpu's RequestAdapter/RequestDevice/MapAsync
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# as if they were synchronous. Adds ~30-50% wasm size and a small
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# per-await runtime cost; acceptable for the spike, revisit when
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# we ship.
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"-sASYNCIFY"
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# Streaming + chunked geometry want a heap that can grow as buffers
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# arrive. 256 MB initial, 2 GB ceiling (matches the wasm32 pointer
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# cap; --shared64 / MEMORY64 would lift this later if we need it).
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"-sALLOW_MEMORY_GROWTH=1"
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"-sINITIAL_MEMORY=268435456" # 256 MB
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"-sMAXIMUM_MEMORY=2147483648" # 2 GB
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# FETCH lets emscripten_fetch issue HTTP Range requests for the
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# sidecar byte-range loader. Not used yet by the scaffold but
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# needed by the upcoming #27 web streaming I/O backend.
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"-sFETCH=1"
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# Shell template wraps the JS output in our canvas page.
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"--shell-file=${CMAKE_CURRENT_SOURCE_DIR}/shell.html"
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)
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set_target_properties(IfcViewerWeb PROPERTIES SUFFIX ".html")
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