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e92d322d40
Make C++ standard to be enable from cmake settings: User will be able choosing C++ language standard by selecting cmake variable BUILD_CPP_STANDARD. For correct working, CMAKE_CXX_STANDARD cmake built-in variable should be available. To enable CMAKE_CXX_STANDARD, minimum CMAKE version has been updated to 3.1. Available next standard items: C++11 C++14 C++17 C++20 C++23 This issue consists from several steps to achive main goal: 1) Configuratiuon, CMake - allow selecting C++ standard. 2) Require minimum CMAKE version 3.1 (for enabling CMAKE_CXX_STANDARD). 3) More flexible CMAKE_CXX_COMPILER_ID identification (fixups previous commit!) 4) Add description of new CMAKE variable `BUILD_CPP_STANDARD` into documentation. 5) Update CMAKE requirements in documentation. 6) Set C++11 standard for several projects.
WebGL: 3D Viewer (JavaScript|C++|WebAssembly)
This sample demonstrates simple way of using OCCT libraries in Web application written in C++ and translated into WebAssembly module using Emscripten SDK (emsdk): https://emscripten.org/
Sample consists of the Open CASCADE 3D Viewer with a button for opening a model in BREP format.
The sample requires a WebGL 2.0 capable browser supporting WebAssembly 1.0 (Wasm).
The sample could be found within OCCT repository in folder /samples/webgl/.
@figure{sample_webgl.png,"",240} height=408px
Installation and configuration:
- Install Emscripten SDK and activate minimal configuration (Python, Java and CLang) following emsdk documentation. Activate also MinGW when building sample on Windows host.
- Build (using emsdk) or download FreeType static library.
- Configure CMake for building Open CASCADE Technology (OCCT) static libraries (BUILD_LIBRARY_TYPE="Static"). For this, activate emsdk command prompt, configure CMake for building OCCT using cross-compilation toolchain, disable BUILD_MODULE_Draw.
- Perform building and installation steps.
> ${EMSDK}/fastcomp/emscripten/cmake/Modules/Platform/Emscripten.cmake
- Configure CMake for building this WebGL sample using emsdk with paths to OCCT and FreeType. Perform building and installation steps.
- Copy data/occ/Ball.brep from OCCT into "samples" folder within WebGL sample installation path.
- Navigate to installation folder and start web server from it; Python coming with emsdk can be used for this purpose:
> python -m SimpleHTTPServer 8080
- Open compatible browser and enter path taking into account your web server settings:
> http://localhost:8080/occt-webgl-sample.html