Add emscripten logic

Based on the CuraEngine patch done by Wakeful-Cloud. Not sure if we want
to go the same route but it will give us a quick way forward.
https://github.com/Cloud-CNC/cura-wasm

Doing the conan install with the following profile
```
include(cura.jinja)

[tool_requires]
emsdk/3.1.50

[settings]
os=Emscripten
arch=wasm
```
should do the trick in building it with emsdk. Still very much WIP!

Contributes to NP-5

Co-authored-by: Wakeful-Cloud <[email protected]>

CMakeLists.txt

@@ -151,7 +151,7 @@ set(engine_SRCS # Except main.cpp.
         src/utils/ToolpathVisualizer.cpp
         src/utils/VoronoiUtils.cpp
         src/utils/VoxelUtils.cpp
-        )
+)
 
 add_library(_CuraEngine STATIC ${engine_SRCS} ${engine_PB_SRCS})
 #use_threads(_CuraEngine)
@@ -162,7 +162,7 @@ target_include_directories(_CuraEngine
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
         PRIVATE
         $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}> # Include Cura.pb.h
-        )
+)
 
 target_compile_definitions(_CuraEngine
         PUBLIC
@@ -180,7 +180,7 @@ target_compile_definitions(_CuraEngine
         $<$<CONFIG:RelWithDebInfo>:ASSERT_INSANE_OUTPUT>
         $<$<CONFIG:RelWithDebInfo>:USE_CPU_TIME>
         $<$<CONFIG:RelWithDebInfo>:DEBUG>
-        )
+)
 
 enable_sanitizers(_CuraEngine)
 
@@ -189,7 +189,7 @@ if (${EXTENSIVE_WARNINGS})
 endif ()
 
 if (ENABLE_ARCUS)
-    target_link_libraries(_CuraEngine PUBLIC arcus::arcus )
+    target_link_libraries(_CuraEngine PUBLIC arcus::arcus)
 endif ()
 
 find_package(clipper REQUIRED)
@@ -242,7 +242,7 @@ else ()
         SET(CMAKE_RC_COMPILER_INIT windres)
         SET(CMAKE_RC_COMPILE_OBJECT
                 "<CMAKE_RC_COMPILER> <FLAGS> -O coff <DEFINES> -i <SOURCE> -o <OBJECT>"
-                )
+        )
     endif ()
     add_executable(CuraEngine src/main.cpp ${RES_FILES}) # ..., but don't forget the glitter!
     if (ENABLE_SENTRY)
@@ -293,7 +293,7 @@ if (ENABLE_BENCHMARKS)
     add_subdirectory(benchmark)
     if (NOT WIN32)
         add_subdirectory(stress_benchmark)
-    endif()
+    endif ()
 endif ()
 
 if (ENABLE_TESTING)

conanfile.py

@@ -143,6 +143,9 @@ def generate(self):
             tc.variables["ENABLE_PLUGINS"] = self.options.enable_plugins
         tc.generate()
 
+        if self.settings.arch == "wasm" and self.settings.os == "Emscripten":
+            self.buildenv.define("EMCC_CFLAGS", "-s ALLOW_MEMORY_GROWTH=1 -s EXPORT_ES6=1 -s EXPORT_NAME='CuraEngine' -s EXPORTED_RUNTIME_METHODS='[\"callMain\", \"FS\"]' -s INVOKE_RUN=0 -s MODULARIZE=1 -s SINGLE_FILE=1 -s ENVIRONMENT=worker -s USE_ES6_IMPORT_META=0")
+
         for dep in self.dependencies.values():
             if len(dep.cpp_info.libdirs) > 0:
                 copy(self, "*.dylib", dep.cpp_info.libdirs[0], self.build_folder)

include/communication/CommandLine.h

@@ -1,5 +1,5 @@
-//  Copyright (c) 2018-2022 Ultimaker B.V.
-//  CuraEngine is released under the terms of the AGPLv3 or higher.
+// Copyright (c) 2024 UltiMaker
+// CuraEngine is released under the terms of the AGPLv3 or higher
 
 #ifndef COMMANDLINE_H
 #define COMMANDLINE_H
@@ -151,6 +151,10 @@ class CommandLine : public Communication
     void sliceNext() override;
 
 private:
+#ifdef __EMSCRIPTEN__
+    std::string progressHandler;
+#endif
+
     /*
      * \brief The command line arguments that the application was called with.
      */

src/communication/CommandLine.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2022 Ultimaker B.V.
+// Copyright (c) 2024 UltiMaker
 // CuraEngine is released under the terms of the AGPLv3 or higher
 
 #include "communication/CommandLine.h"
@@ -21,6 +21,10 @@
 #include "Slice.h"
 #include "utils/Matrix4x3D.h" //For the mesh_rotation_matrix setting.
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#endif
+
 namespace cura
 {
 
@@ -106,6 +110,12 @@ void CommandLine::sendProgress(double progress) const
         return;
     }
     // TODO: Do we want to print a progress bar? We'd need a better solution to not have that progress bar be ruined by any logging.
+#ifdef __EMSCRIPTEN__
+    // Call progress handler with progress
+    char js[100];
+    std::sprintf(js, "globalThis[\"%s\"](%f)", progressHandler.c_str(), progress);
+    emscripten_run_script(js);
+#endif
 }
 
 void CommandLine::sliceNext()
@@ -178,6 +188,15 @@ void CommandLine::sliceNext()
                     force_read_parent = false;
                     force_read_nondefault = false;
                 }
+#ifdef __EMSCRIPTEN__
+                else if (argument.find("--progress") == 0)
+                {
+                    // Store progress handler name
+                    argument_index++;
+                    argument = arguments_[argument_index];
+                    progressHandler = argument;
+                }
+#endif
                 else
                 {
                     spdlog::error("Unknown option: {}", argument);