171 lines
6.3 KiB
Python
171 lines
6.3 KiB
Python
import os
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from emscripten_helpers import run_closure_compiler, create_engine_file
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from SCons.Util import WhereIs
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def is_active():
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return True
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def get_name():
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return "JavaScript"
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def can_build():
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return WhereIs("emcc") is not None
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def get_opts():
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from SCons.Variables import BoolVariable
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return [
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# eval() can be a security concern, so it can be disabled.
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BoolVariable("javascript_eval", "Enable JavaScript eval interface", True),
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BoolVariable("threads_enabled", "Enable WebAssembly Threads support (limited browser support)", False),
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BoolVariable("use_closure_compiler", "Use closure compiler to minimize JavaScript code", False),
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]
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def get_flags():
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return [
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("tools", False),
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("builtin_pcre2_with_jit", False),
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# Disabling the mbedtls module reduces file size.
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# The module has little use due to the limited networking functionality
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# in this platform. For the available networking methods, the browser
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# manages TLS.
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("module_mbedtls_enabled", False),
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]
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def configure(env):
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## Build type
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if env["target"] == "release":
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# Use -Os to prioritize optimizing for reduced file size. This is
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# particularly valuable for the web platform because it directly
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# decreases download time.
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# -Os reduces file size by around 5 MiB over -O3. -Oz only saves about
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# 100 KiB over -Os, which does not justify the negative impact on
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# run-time performance.
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env.Append(CCFLAGS=["-Os"])
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env.Append(LINKFLAGS=["-Os"])
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elif env["target"] == "release_debug":
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env.Append(CCFLAGS=["-Os"])
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env.Append(LINKFLAGS=["-Os"])
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env.Append(CPPDEFINES=["DEBUG_ENABLED"])
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# Retain function names for backtraces at the cost of file size.
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env.Append(LINKFLAGS=["--profiling-funcs"])
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else: # "debug"
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env.Append(CPPDEFINES=["DEBUG_ENABLED"])
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env.Append(CCFLAGS=["-O1", "-g"])
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env.Append(LINKFLAGS=["-O1", "-g"])
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env.Append(LINKFLAGS=["-s", "ASSERTIONS=1"])
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if env["tools"]:
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if not env["threads_enabled"]:
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raise RuntimeError(
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"Threads must be enabled to build the editor. Please add the 'threads_enabled=yes' option"
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)
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# Tools need more memory. Initial stack memory in bytes. See `src/settings.js` in emscripten repository (will be renamed to INITIAL_MEMORY).
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env.Append(LINKFLAGS=["-s", "TOTAL_MEMORY=33554432"])
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else:
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# Disable exceptions and rtti on non-tools (template) builds
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# These flags help keep the file size down.
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env.Append(CCFLAGS=["-fno-exceptions", "-fno-rtti"])
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# Don't use dynamic_cast, necessary with no-rtti.
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env.Append(CPPDEFINES=["NO_SAFE_CAST"])
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## Copy env variables.
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env["ENV"] = os.environ
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# LTO
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if env["use_lto"]:
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env.Append(CCFLAGS=["-s", "WASM_OBJECT_FILES=0"])
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env.Append(LINKFLAGS=["-s", "WASM_OBJECT_FILES=0"])
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env.Append(CCFLAGS=["-flto"])
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env.Append(LINKFLAGS=["-flto"])
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# Closure compiler
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if env["use_closure_compiler"]:
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# For emscripten support code.
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env.Append(LINKFLAGS=["--closure", "1"])
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# Register builder for our Engine files
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jscc = env.Builder(generator=run_closure_compiler, suffix=".cc.js", src_suffix=".js")
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env.Append(BUILDERS={"BuildJS": jscc})
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# Add method that joins/compiles our Engine files.
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env.AddMethod(create_engine_file, "CreateEngineFile")
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# Closure compiler extern and support for ecmascript specs (const, let, etc).
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env["ENV"]["EMCC_CLOSURE_ARGS"] = "--language_in ECMASCRIPT6"
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env["CC"] = "emcc"
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env["CXX"] = "em++"
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env["LINK"] = "emcc"
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env["AR"] = "emar"
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env["RANLIB"] = "emranlib"
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# Use TempFileMunge since some AR invocations are too long for cmd.exe.
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# Use POSIX-style paths, required with TempFileMunge.
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env["ARCOM_POSIX"] = env["ARCOM"].replace("$TARGET", "$TARGET.posix").replace("$SOURCES", "$SOURCES.posix")
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env["ARCOM"] = "${TEMPFILE(ARCOM_POSIX)}"
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# All intermediate files are just LLVM bitcode.
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env["OBJPREFIX"] = ""
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env["OBJSUFFIX"] = ".bc"
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env["PROGPREFIX"] = ""
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# Program() output consists of multiple files, so specify suffixes manually at builder.
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env["PROGSUFFIX"] = ""
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env["LIBPREFIX"] = "lib"
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env["LIBSUFFIX"] = ".bc"
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env["LIBPREFIXES"] = ["$LIBPREFIX"]
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env["LIBSUFFIXES"] = ["$LIBSUFFIX"]
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env.Prepend(CPPPATH=["#platform/javascript"])
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env.Append(CPPDEFINES=["JAVASCRIPT_ENABLED", "UNIX_ENABLED"])
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if env["javascript_eval"]:
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env.Append(CPPDEFINES=["JAVASCRIPT_EVAL_ENABLED"])
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# Thread support (via SharedArrayBuffer).
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if env["threads_enabled"]:
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env.Append(CPPDEFINES=["PTHREAD_NO_RENAME"])
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env.Append(CCFLAGS=["-s", "USE_PTHREADS=1"])
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env.Append(LINKFLAGS=["-s", "USE_PTHREADS=1"])
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env.Append(LINKFLAGS=["-s", "PTHREAD_POOL_SIZE=8"])
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env.Append(LINKFLAGS=["-s", "WASM_MEM_MAX=2048MB"])
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env.extra_suffix = ".threads" + env.extra_suffix
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else:
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env.Append(CPPDEFINES=["NO_THREADS"])
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# Reduce code size by generating less support code (e.g. skip NodeJS support).
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env.Append(LINKFLAGS=["-s", "ENVIRONMENT=web,worker"])
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# We use IDBFS in javascript_main.cpp. Since Emscripten 1.39.1 it needs to
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# be linked explicitly.
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env.Append(LIBS=["idbfs.js"])
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env.Append(LINKFLAGS=["-s", "BINARYEN=1"])
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env.Append(LINKFLAGS=["-s", "MODULARIZE=1", "-s", "EXPORT_NAME='Godot'"])
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# Allow increasing memory buffer size during runtime. This is efficient
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# when using WebAssembly (in comparison to asm.js) and works well for
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# us since we don't know requirements at compile-time.
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env.Append(LINKFLAGS=["-s", "ALLOW_MEMORY_GROWTH=1"])
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# This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
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env.Append(LINKFLAGS=["-s", "USE_WEBGL2=1"])
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env.Append(LINKFLAGS=["-s", "INVOKE_RUN=0"])
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# Allow use to take control of swapping WebGL buffers.
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env.Append(LINKFLAGS=["-s", "OFFSCREEN_FRAMEBUFFER=1"])
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# callMain for manual start, FS for preloading, PATH and ERRNO_CODES for BrowserFS.
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env.Append(LINKFLAGS=["-s", "EXTRA_EXPORTED_RUNTIME_METHODS=['callMain', 'FS']"])
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# Add code that allow exiting runtime.
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env.Append(LINKFLAGS=["-s", "EXIT_RUNTIME=1"])
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