Emscripten support

CMakeLists.txt

@@ -95,7 +95,7 @@ if(USE_PYTHON)
     file(TO_CMAKE_PATH ${PYTHON_PACKAGES_INSTALL_DIR} PYTHON_PACKAGES_INSTALL_DIR)
 endif(USE_PYTHON)
 
-if(APPLE)
+if(APPLE AND NOT EMSCRIPTEN)
   set(NG_INSTALL_DIR_BIN_DEFAULT Contents/MacOS)
   set(NG_INSTALL_DIR_LIB_DEFAULT Contents/MacOS)
   set(NG_INSTALL_DIR_CMAKE_DEFAULT Contents/Resources/CMake)
@@ -104,7 +104,7 @@ if(APPLE)
   set(NG_INSTALL_DIR_INCLUDE_DEFAULT Contents/Resources/include)
 
   set(NG_RPATH_TOKEN "@loader_path")
-else(APPLE)
+else(APPLE AND NOT EMSCRIPTEN)
   set(NG_INSTALL_DIR_BIN_DEFAULT bin)
   set(NG_INSTALL_DIR_LIB_DEFAULT lib)
   if(WIN32)
@@ -117,7 +117,7 @@ else(APPLE)
   set(NG_INSTALL_DIR_INCLUDE_DEFAULT include)
 
   set(NG_RPATH_TOKEN "\$ORIGIN")
-endif(APPLE)
+endif(APPLE AND NOT EMSCRIPTEN)
 
 set(NG_INSTALL_DIR_PYTHON ${NG_INSTALL_DIR_PYTHON_DEFAULT} CACHE STRING "Install directory for Python files")
 set(NG_INSTALL_DIR_BIN ${NG_INSTALL_DIR_BIN_DEFAULT} CACHE STRING "Install directory for executables")

cmake/SuperBuild.cmake

@@ -14,9 +14,16 @@ set (SUBPROJECT_ARGS
     PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dependencies
 )
 
+if (EMSCRIPTEN)
+    set (SUBPROJECT_ARGS
+        ${SUBPROJECT_ARGS}
+        CMAKE_COMMAND emcmake ${CMAKE_COMMAND})
+endif()
+
 # only show output on failure in ci-builds
 if(DEFINED ENV{CI})
     set (SUBPROJECT_ARGS
+        ${SUBPROJECT_ARGS}
         LOG_DOWNLOAD ON
         LOG_BUILD ON
         LOG_INSTALL ON
@@ -134,25 +141,27 @@ endif(BUILD_OCC)
 endif(USE_OCC)
 
 if(BUILD_ZLIB)
-  set(ZLIB_DIR ${CMAKE_CURRENT_BINARY_DIR}/dependencies/zlib)
+  set(ZLIB_ROOT ${CMAKE_CURRENT_BINARY_DIR}/dependencies/zlib)
   ExternalProject_Add(project_zlib
     ${SUBPROJECT_ARGS}
     URL https://github.com/madler/zlib/archive/refs/tags/v1.2.11.zip
     URL_MD5 9d6a627693163bbbf3f26403a3a0b0b1
     DOWNLOAD_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external_dependencies
     CMAKE_ARGS
-         -DCMAKE_INSTALL_PREFIX=${ZLIB_DIR}
+         -DCMAKE_INSTALL_PREFIX=${ZLIB_ROOT}
          ${SUBPROJECT_CMAKE_ARGS}
     UPDATE_COMMAND "" # Disable update
     BUILD_IN_SOURCE 1
     )
 
   list(APPEND NETGEN_DEPENDENCIES project_zlib)
-  list(APPEND NETGEN_CMAKE_PREFIX_PATH ${ZLIB_DIR})
   if(WIN32)
     # force linking the static library
-    set(ZLIB_INCLUDE_DIRS ${ZLIB_DIR}/include)
+    set(ZLIB_INCLUDE_DIRS ${ZLIB_ROOT}/include)
-    set(ZLIB_LIBRARIES ${ZLIB_DIR}/lib/zlibstatic.lib)
+    set(ZLIB_LIBRARIES ${ZLIB_ROOT}/lib/zlibstatic.lib)
+  elseif(EMSCRIPTEN)
+    set(ZLIB_INCLUDE_DIRS ${ZLIB_ROOT}/include)
+    set(ZLIB_LIBRARIES ${ZLIB_ROOT}/lib/libz.a)
   endif(WIN32)
 else()
     include(cmake/external_projects/zlib.cmake)
@@ -252,6 +261,7 @@ set_vars( NETGEN_CMAKE_ARGS
   OpenCascade_ROOT
   ZLIB_INCLUDE_DIRS
   ZLIB_LIBRARIES
+  ZLIB_ROOT
 
   NGLIB_LIBRARY_TYPE
   NGCORE_LIBRARY_TYPE

libsrc/core/CMakeLists.txt

@@ -17,6 +17,13 @@ add_library(ngcore ${NGCORE_LIBRARY_TYPE}
 string(REPLACE "|" ";" ng_compile_flags_replace_sep "${NG_COMPILE_FLAGS}")
 target_compile_options(ngcore PUBLIC ${ng_compile_flags_replace_sep})
 
+if(EMSCRIPTEN)
+  target_link_options(ngcore PUBLIC -sALLOW_MEMORY_GROWTH)
+  # target_link_options(ngcore PUBLIC -sINITIAL_MEMORY=1gb)
+  target_link_options(ngcore PUBLIC -pthread -sPTHREAD_POOL_SIZE=16)
+  target_compile_options(ngcore PUBLIC -pthread)
+endif()
+
 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9)
     target_link_libraries(ngcore PUBLIC stdc++fs)
 endif()

libsrc/core/exception.cpp

@@ -23,7 +23,7 @@ namespace ngcore
 
 
 // ********* STUFF FOR GETBACKTRACE ***************************
-#ifdef __GNUC__
+#if defined __GNUC__ && !defined __EMSCRIPTEN__
 
 #include <execinfo.h>
 #include <string.h>
@@ -226,7 +226,7 @@ static bool dummy = []()
     return true;
 }();
 
-#else // __GNUC__
+#else // __GNUC__ and not __EMSCRIPTEN__
 
 namespace ngcore
 {

libsrc/core/utils.hpp

@@ -71,6 +71,8 @@ namespace ngcore
     unsigned long long tics;
     __asm __volatile("mrs %0, CNTVCT_EL0" : "=&r" (tics));
     return tics;
+#elif defined(__EMSCRIPTEN__)
+    return std::chrono::high_resolution_clock::now().time_since_epoch().count();
 #else
 #warning "Unsupported CPU architecture"
     return 0;

libsrc/meshing/meshclass.cpp

@@ -4452,30 +4452,30 @@ namespace netgen
       }
 
     return 1;
-    if ( /* hp */ 1)  // needed for old, simple hp-refinement
+    // if ( /* hp */ 1)  // needed for old, simple hp-refinement
-      { 
+    //   { 
-        // trigs with 2 or more segments are illegal
+    //     // trigs with 2 or more segments are illegal
-        int i;
+    //     int i;
-        int nseg = 0;
+    //     int nseg = 0;
 
-        if (!segmentht)
+    //     if (!segmentht)
-          {
+    //       {
-            cerr << "no segmentht allocated" << endl;
+    //         cerr << "no segmentht allocated" << endl;
-            return 0;
+    //         return 0;
-          }
+    //       }
 
-        //      Point3d cp(0.5, 0.5, 0.5);
+    //     //      Point3d cp(0.5, 0.5, 0.5);
-        for (i = 1; i <= 3; i++)
+    //     for (i = 1; i <= 3; i++)
-          {
+    //       {
-            INDEX_2 i2(el.PNumMod (i), el.PNumMod (i+1));
+    //         INDEX_2 i2(el.PNumMod (i), el.PNumMod (i+1));
-            i2.Sort();
+    //         i2.Sort();
-            if (segmentht -> Used (i2))
+    //         if (segmentht -> Used (i2))
-              nseg++;
+    //           nseg++;
-          }
+    //       }
-        if (nseg >= 2) 
+    //     if (nseg >= 2) 
-          return 0;
+    //       return 0;
-      }
+    //   }
-    return 1;
+    // return 1;
   }
 
   double Mesh :: CalcTotalBad (const MeshingParameters & mp )

nglib/CMakeLists.txt

@@ -9,5 +9,11 @@ target_link_libraries(nglib PUBLIC ngcore)
 
 target_link_libraries( nglib PRIVATE ${MPI_CXX_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${JPEG_LIBRARIES} ${MKL_LIBRARIES} ${ZLIB_LIBRARIES} ${OCC_LIBRARIES} netgen_cgns )
 
+if(EMSCRIPTEN)
+  target_link_options(nglib PUBLIC -sALLOW_MEMORY_GROWTH)
+  target_link_options(nglib PUBLIC -pthread -sPTHREAD_POOL_SIZE=16)
+  target_compile_options(nglib PUBLIC -pthread)
+endif(EMSCRIPTEN)
+
 install(TARGETS nglib netgen_cgns ${NG_INSTALL_DIR})
 install(FILES nglib.h DESTINATION ${NG_INSTALL_DIR_INCLUDE} COMPONENT netgen_devel)

rules/CMakeLists.txt

@@ -1,7 +1,15 @@
 # this file is included from the parent directory (otherwise generated source files are not recognized properly by cmake)
 
 # generate .cpp files containing the string of the .rls meshing rule files
-add_executable(makerls rules/makerlsfile.cpp)
+if(EMSCRIPTEN)
+  add_custom_command(OUTPUT makerls
+    COMMAND g++ ${CMAKE_CURRENT_SOURCE_DIR}/rules/makerlsfile.cpp -o ${CMAKE_CURRENT_BINARY_DIR}/makerls
+    )
+  set(rules_command ${CMAKE_BINARY_DIR}/makerls)
+else(EMSCRIPTEN)
+  add_executable(makerls rules/makerlsfile.cpp)
+  set(rules_command makerls)
+endif()
 
 set(rules
     hexrules
@@ -21,7 +29,7 @@ foreach(rule ${rules})
     set(rule_cpp ${CMAKE_CURRENT_BINARY_DIR}/rules/rule_${rule}.cpp)
 
     add_custom_command(OUTPUT ${rule_cpp}
-      COMMAND makerls ${rule_file} ${rule_cpp} ${rule}
+      COMMAND ${rules_command} ${rule_file} ${rule_cpp} ${rule}
       DEPENDS makerls ${rule_file}
     )
 endforeach()