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import os
from emscripten_helpers import parse_config, run_closure_compiler, create_engine_file
def is_active():
return True
def get_name():
return 'JavaScript'
def can_build():
return 'EM_CONFIG' in os.environ or os.path.exists(os.path.expanduser('~/.emscripten'))
def get_opts():
from SCons.Variables import BoolVariable
return [
# eval() can be a security concern, so it can be disabled.
BoolVariable('javascript_eval', 'Enable JavaScript eval interface', True),
BoolVariable('threads_enabled', 'Enable WebAssembly Threads support (limited browser support)', False),
BoolVariable('use_closure_compiler', 'Use closure compiler to minimize Javascript code', False),
]
def get_flags():
return [
('tools', False),
('builtin_pcre2_with_jit', False),
# Disabling the mbedtls module reduces file size.
# The module has little use due to the limited networking functionality
# in this platform. For the available networking methods, the browser
# manages TLS.
('module_mbedtls_enabled', False),
]
def configure(env):
## Build type
if env['target'] == 'release':
# Use -Os to prioritize optimizing for reduced file size. This is
# particularly valuable for the web platform because it directly
# decreases download time.
# -Os reduces file size by around 5 MiB over -O3. -Oz only saves about
# 100 KiB over -Os, which does not justify the negative impact on
# run-time performance.
env.Append(CCFLAGS=['-Os'])
env.Append(LINKFLAGS=['-Os'])
elif env['target'] == 'release_debug':
env.Append(CCFLAGS=['-Os'])
env.Append(LINKFLAGS=['-Os'])
env.Append(CPPDEFINES=['DEBUG_ENABLED'])
# Retain function names for backtraces at the cost of file size.
env.Append(LINKFLAGS=['--profiling-funcs'])
else: # 'debug'
env.Append(CPPDEFINES=['DEBUG_ENABLED'])
env.Append(CCFLAGS=['-O1', '-g'])
env.Append(LINKFLAGS=['-O1', '-g'])
env.Append(LINKFLAGS=['-s', 'ASSERTIONS=1'])
if env['tools']:
if not env['threads_enabled']:
raise RuntimeError("Threads must be enabled to build the editor. Please add the 'threads_enabled=yes' option")
# Tools need more memory. Initial stack memory in bytes. See `src/settings.js` in emscripten repository (will be renamed to INITIAL_MEMORY).
env.Append(LINKFLAGS=['-s', 'TOTAL_MEMORY=33554432'])
else:
# Disable exceptions and rtti on non-tools (template) builds
# These flags help keep the file size down.
env.Append(CCFLAGS=['-fno-exceptions', '-fno-rtti'])
# Don't use dynamic_cast, necessary with no-rtti.
env.Append(CPPDEFINES=['NO_SAFE_CAST'])
## Copy env variables.
env['ENV'] = os.environ
# LTO
if env['use_lto']:
env.Append(CCFLAGS=['-s', 'WASM_OBJECT_FILES=0'])
env.Append(LINKFLAGS=['-s', 'WASM_OBJECT_FILES=0'])
env.Append(LINKFLAGS=['--llvm-lto', '1'])
# Closure compiler
if env['use_closure_compiler']:
# For emscripten support code.
env.Append(LINKFLAGS=['--closure', '1'])
# Register builder for our Engine files
jscc = env.Builder(generator=run_closure_compiler, suffix='.cc.js', src_suffix='.js')
env.Append(BUILDERS = {'BuildJS' : jscc})
# Add method that joins/compiles our Engine files.
env.AddMethod(create_engine_file, "CreateEngineFile")
# Closure compiler extern and support for ecmascript specs (const, let, etc).
env['ENV']['EMCC_CLOSURE_ARGS'] = '--language_in ECMASCRIPT6'
em_config = parse_config()
env.PrependENVPath('PATH', em_config['EMCC_ROOT'])
env['CC'] = 'emcc'
env['CXX'] = 'em++'
env['LINK'] = 'emcc'
env['AR'] = 'emar'
env['RANLIB'] = 'emranlib'
# Use TempFileMunge since some AR invocations are too long for cmd.exe.
# Use POSIX-style paths, required with TempFileMunge.
env['ARCOM_POSIX'] = env['ARCOM'].replace(
'$TARGET', '$TARGET.posix').replace(
'$SOURCES', '$SOURCES.posix')
env['ARCOM'] = '${TEMPFILE(ARCOM_POSIX)}'
# All intermediate files are just LLVM bitcode.
env['OBJPREFIX'] = ''
env['OBJSUFFIX'] = '.bc'
env['PROGPREFIX'] = ''
# Program() output consists of multiple files, so specify suffixes manually at builder.
env['PROGSUFFIX'] = ''
env['LIBPREFIX'] = 'lib'
env['LIBSUFFIX'] = '.bc'
env['LIBPREFIXES'] = ['$LIBPREFIX']
env['LIBSUFFIXES'] = ['$LIBSUFFIX']
env.Prepend(CPPPATH=['#platform/javascript'])
env.Append(CPPDEFINES=['JAVASCRIPT_ENABLED', 'UNIX_ENABLED'])
if env['javascript_eval']:
env.Append(CPPDEFINES=['JAVASCRIPT_EVAL_ENABLED'])
# Thread support (via SharedArrayBuffer).
if env['threads_enabled']:
env.Append(CPPDEFINES=['PTHREAD_NO_RENAME'])
env.Append(CCFLAGS=['-s', 'USE_PTHREADS=1'])
env.Append(LINKFLAGS=['-s', 'USE_PTHREADS=1'])
env.Append(LINKFLAGS=['-s', 'PTHREAD_POOL_SIZE=4'])
env.Append(LINKFLAGS=['-s', 'WASM_MEM_MAX=2048MB'])
else:
env.Append(CPPDEFINES=['NO_THREADS'])
# Reduce code size by generating less support code (e.g. skip NodeJS support).
env.Append(LINKFLAGS=['-s', 'ENVIRONMENT=web,worker'])
# We use IDBFS in javascript_main.cpp. Since Emscripten 1.39.1 it needs to
# be linked explicitly.
env.Append(LIBS=['idbfs.js'])
env.Append(LINKFLAGS=['-s', 'BINARYEN=1'])
env.Append(LINKFLAGS=['-s', 'MODULARIZE=1', '-s', 'EXPORT_NAME="Godot"'])
# Allow increasing memory buffer size during runtime. This is efficient
# when using WebAssembly (in comparison to asm.js) and works well for
# us since we don't know requirements at compile-time.
env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1'])
# This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
env.Append(LINKFLAGS=['-s', 'USE_WEBGL2=1'])
env.Append(LINKFLAGS=['-s', 'INVOKE_RUN=0'])
# callMain for manual start, FS for preloading.
env.Append(LINKFLAGS=['-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["callMain", "FS"]'])
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