CMake build system

cmake/platforms/emscripten.cmake

@@ -0,0 +1,50 @@
+# Emscripten specific settings
+
+if(NOT EMSCRIPTEN)
+    return()
+endif()
+
+set(CMAKE_EXECUTABLE_SUFFIX ".js")
+set(CMAKE_SHARED_LIBRARY_SUFFIX ".wasm")
+
+# Disable options that don't make sense for emscripten
+set(BUILD_SERVER OFF CACHE INTERNAL "")
+set(BUILD_RENDERER_GL1 OFF CACHE INTERNAL "")
+set(USE_RENDERER_DLOPEN OFF CACHE INTERNAL "")
+set(USE_OPENAL_DLOPEN OFF CACHE INTERNAL "")
+set(BUILD_GAME_LIBRARIES OFF CACHE INTERNAL "")
+set(USE_HTTP OFF CACHE INTERNAL "")
+
+list(APPEND CLIENT_COMPILE_OPTIONS -sUSE_SDL=2)
+
+list(APPEND CLIENT_LINK_OPTIONS
+    -sTOTAL_MEMORY=256MB
+    -sSTACK_SIZE=5MB
+    -sMIN_WEBGL_VERSION=1
+    -sMAX_WEBGL_VERSION=2
+    -sEXPORTED_RUNTIME_METHODS=FS,addRunDependency,removeRunDependency
+    -sEXIT_RUNTIME=1
+    -sEXPORT_ES6
+    -sEXPORT_NAME=${CLIENT_NAME}
+)
+
+option(EMSCRIPTEN_PRELOAD_FILE "Preload game files into .data file" OFF)
+
+if(EMSCRIPTEN_PRELOAD_FILE)
+    if(NOT EXISTS "${CMAKE_SOURCE_DIR}/${BASEGAME}")
+        message(FATAL_ERROR "No files in '${BASEGAME}' directory for emscripten to preload.")
+    endif()
+    list(APPEND CLIENT_LINK_OPTIONS "--preload-file ${BASEGAME}")
+endif()
+
+set(POST_CLIENT_CONFIGURE_FUNCTION deploy_shell_files)
+
+function(deploy_shell_files)
+    configure_file(${SOURCE_DIR}/web/client.html.in
+        ${CMAKE_BINARY_DIR}/${CMAKE_BUILD_TYPE}/${CLIENT_NAME}.html @ONLY)
+
+    if(NOT EMSCRIPTEN_PRELOAD_FILE)
+        configure_file(${SOURCE_DIR}/web/client-config.json
+            ${CMAKE_BINARY_DIR}/${CMAKE_BUILD_TYPE}/${CLIENT_NAME}-config.json COPYONLY)
+    endif()
+endfunction()