emscripten: add emscripten platform support (#720)

CMakeLists.txt

@@ -41,7 +41,11 @@ set(YAPB_SRC
     "src/vistable.cpp"
 )
 
-add_library(${PROJECT_NAME} SHARED ${YAPB_SRC})
+if(CMAKE_SYSTEM_NAME MATCHES "Emscripten")
+    add_executable(${PROJECT_NAME} ${YAPB_SRC})
+else ()
+    add_library(${PROJECT_NAME} SHARED ${YAPB_SRC})
+endif ()
 find_package(Git QUIET)
 
 if(GIT_FOUND)
@@ -66,11 +70,19 @@ endif()
 if((CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU") AND NOT MSVC)
     target_compile_options(${PROJECT_NAME} PRIVATE -DCR_NATIVE_BUILD -flto=auto -fno-exceptions -fno-rtti -fno-threadsafe-statics -pthread)
 
+    if(NOT CMAKE_SYSTEM_NAME MATCHES "Emscripten")
         if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "arm64")
             target_compile_options(${PROJECT_NAME} PRIVATE -march=armv8-a+fp+simd)
         elseif(BUILD_X86)
             target_compile_options(${PROJECT_NAME} PRIVATE -mmmx -msse -msse2 -msse3 -mfpmath=sse)
         endif()
+    else ()
+        #target_compile_options(${PROJECT_NAME} PRIVATE -msse -msse2 -msse3 -msimd128 -fPIC)
+        target_compile_definitions(${PROJECT_NAME} PRIVATE CR_DISABLE_SIMD)
+        target_compile_options(${PROJECT_NAME} PRIVATE -fPIC -fvisibility=hidden)
+        target_link_options(${PROJECT_NAME} PRIVATE -sSIDE_MODULE=1)
+        set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".wasm")
+    endif ()
 	
     if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
         target_compile_options(${PROJECT_NAME} PRIVATE -funroll-loops -fomit-frame-pointer -fno-stack-protector -fvisibility=hidden -fvisibility-inlines-hidden -fno-math-errno)

ext/crlib

@@ -1 +1 @@
-Subproject commit 43f0acc90e9042efb8e9f7287bfa6935a0f4bc90
+Subproject commit 89cfcf74cc870844d6e5029c296f6c4a6b2b6070

src/engine.cpp

@@ -867,6 +867,10 @@ bool Game::loadCSBinary () {
          }
       }
 
+      if (plat.emscripten) {
+        path = String(plat.env ("XASH3D_GAMELIBPATH")); // defined by launcher
+      }
+
       if (path.empty()) {
          path = strings.joinPath (modname, "dlls", lib) + kLibrarySuffix;
 
@@ -1003,7 +1007,7 @@ bool Game::postload () {
    // register engine lib handle
    m_engineLib.locate (reinterpret_cast <void *> (engfuncs.pfnPrecacheModel));
 
-   if (plat.android) {
+   if (plat.android || plat.emscripten) {
       m_gameFlags |= (GameFlags::Xash3D | GameFlags::Mobility | GameFlags::HasBotVoice | GameFlags::ReGameDLL);
 
       if (is (GameFlags::Metamod)) {

src/storage.cpp

@@ -434,7 +434,7 @@ StringRef BotStorage::getRunningPath () {
    static String path {};
 
    // we're do not do relative (against bot's library) paths on android 
-   if (plat.android) {
+   if (plat.android || plat.emscripten) {
       if (path.empty ()) {
          path = strings.joinPath (game.getRunningModName (), folders.addons, folders.bot);
       }