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godot/platform/web/detect.py

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Python
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import os
import sys
from typing import TYPE_CHECKING
from emscripten_helpers import (
add_js_externs,
add_js_libraries,
add_js_pre,
create_engine_file,
create_template_zip,
get_template_zip_path,
run_closure_compiler,
)
from SCons.Util import WhereIs
from methods import get_compiler_version, print_error, print_warning
if TYPE_CHECKING:
from SCons.Script.SConscript import SConsEnvironment
def get_name():
return "Web"
def can_build():
return WhereIs("emcc") is not None
def get_opts():
from SCons.Variables import BoolVariable
return [
("initial_memory", "Initial WASM memory (in MiB)", 32),
# Matches default values from before Emscripten 3.1.27. New defaults are too low for Godot.
("stack_size", "WASM stack size (in KiB)", 5120),
("default_pthread_stack_size", "WASM pthread default stack size (in KiB)", 2048),
BoolVariable("use_assertions", "Use Emscripten runtime assertions", False),
BoolVariable("use_ubsan", "Use Emscripten undefined behavior sanitizer (UBSAN)", False),
BoolVariable("use_asan", "Use Emscripten address sanitizer (ASAN)", False),
BoolVariable("use_lsan", "Use Emscripten leak sanitizer (LSAN)", False),
BoolVariable("use_safe_heap", "Use Emscripten SAFE_HEAP sanitizer", False),
# eval() can be a security concern, so it can be disabled.
BoolVariable("javascript_eval", "Enable JavaScript eval interface", True),
BoolVariable(
"dlink_enabled", "Enable WebAssembly dynamic linking (GDExtension support). Produces bigger binaries", False
),
BoolVariable("use_closure_compiler", "Use closure compiler to minimize JavaScript code", False),
BoolVariable(
"proxy_to_pthread",
"Use Emscripten PROXY_TO_PTHREAD option to run the main application code to a separate thread",
False,
),
]
def get_doc_classes():
return [
"EditorExportPlatformWeb",
]
def get_doc_path():
return "doc_classes"
def get_flags():
return [
("arch", "wasm32"),
("target", "template_debug"),
("builtin_pcre2_with_jit", False),
("vulkan", False),
# Embree is heavy and requires too much memory (GH-70621).
("module_raycast_enabled", False),
# 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.
("optimize", "size"),
]
def configure(env: "SConsEnvironment"):
# Validate arch.
supported_arches = ["wasm32"]
if env["arch"] not in supported_arches:
print_error(
'Unsupported CPU architecture "%s" for Web. Supported architectures are: %s.'
% (env["arch"], ", ".join(supported_arches))
)
sys.exit(255)
try:
env["initial_memory"] = int(env["initial_memory"])
except Exception:
print_error("Initial memory must be a valid integer")
sys.exit(255)
## Build type
if env.debug_features:
# Retain function names for backtraces at the cost of file size.
env.Append(LINKFLAGS=["--profiling-funcs"])
else:
env["use_assertions"] = True
if env["use_assertions"]:
env.Append(LINKFLAGS=["-s", "ASSERTIONS=1"])
if env.editor_build and env["initial_memory"] < 64:
print("Note: Forcing `initial_memory=64` as it is required for the web editor.")
env["initial_memory"] = 64
env.Append(LINKFLAGS=["-s", "INITIAL_MEMORY=%sMB" % env["initial_memory"]])
## Copy env variables.
env["ENV"] = os.environ
# LTO
if env["lto"] == "auto": # Full LTO for production.
env["lto"] = "full"
if env["lto"] != "none":
if env["lto"] == "thin":
env.Append(CCFLAGS=["-flto=thin"])
env.Append(LINKFLAGS=["-flto=thin"])
else:
env.Append(CCFLAGS=["-flto"])
env.Append(LINKFLAGS=["-flto"])
# Sanitizers
if env["use_ubsan"]:
env.Append(CCFLAGS=["-fsanitize=undefined"])
env.Append(LINKFLAGS=["-fsanitize=undefined"])
if env["use_asan"]:
env.Append(CCFLAGS=["-fsanitize=address"])
env.Append(LINKFLAGS=["-fsanitize=address"])
if env["use_lsan"]:
env.Append(CCFLAGS=["-fsanitize=leak"])
env.Append(LINKFLAGS=["-fsanitize=leak"])
if env["use_safe_heap"]:
env.Append(LINKFLAGS=["-s", "SAFE_HEAP=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 helper method for adding libraries, externs, pre-js.
env["JS_LIBS"] = []
env["JS_PRE"] = []
env["JS_EXTERNS"] = []
env.AddMethod(add_js_libraries, "AddJSLibraries")
env.AddMethod(add_js_pre, "AddJSPre")
env.AddMethod(add_js_externs, "AddJSExterns")
# Add method that joins/compiles our Engine files.
env.AddMethod(create_engine_file, "CreateEngineFile")
# Add method for getting the final zip path
env.AddMethod(get_template_zip_path, "GetTemplateZipPath")
# Add method for creating the final zip file
env.AddMethod(create_template_zip, "CreateTemplateZip")
# Closure compiler extern and support for ecmascript specs (const, let, etc).
env["ENV"]["EMCC_CLOSURE_ARGS"] = "--language_in ECMASCRIPT_2021"
env["CC"] = "emcc"
env["CXX"] = "em++"
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"] = "${TEMPFILE(ARCOM_POSIX)}"
# All intermediate files are just object files.
env["OBJPREFIX"] = ""
env["OBJSUFFIX"] = ".o"
env["PROGPREFIX"] = ""
# Program() output consists of multiple files, so specify suffixes manually at builder.
env["PROGSUFFIX"] = ""
env["LIBPREFIX"] = "lib"
env["LIBSUFFIX"] = ".a"
env["LIBPREFIXES"] = ["$LIBPREFIX"]
env["LIBSUFFIXES"] = ["$LIBSUFFIX"]
# Get version info for checks below.
cc_version = get_compiler_version(env)
cc_semver = (cc_version["major"], cc_version["minor"], cc_version["patch"])
env.Prepend(CPPPATH=["#platform/web"])
env.Append(CPPDEFINES=["WEB_ENABLED", "UNIX_ENABLED"])
if env["opengl3"]:
env.AppendUnique(CPPDEFINES=["GLES3_ENABLED"])
# This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
env.Append(LINKFLAGS=["-s", "USE_WEBGL2=1"])
# Allow use to take control of swapping WebGL buffers.
env.Append(LINKFLAGS=["-s", "OFFSCREEN_FRAMEBUFFER=1"])
# Breaking change since emscripten 3.1.51
# https://github.com/emscripten-core/emscripten/blob/main/ChangeLog.md#3151---121323
if cc_semver >= (3, 1, 51):
# Enables the use of *glGetProcAddress()
env.Append(LINKFLAGS=["-s", "GL_ENABLE_GET_PROC_ADDRESS=1"])
if env["javascript_eval"]:
env.Append(CPPDEFINES=["JAVASCRIPT_EVAL_ENABLED"])
stack_size_opt = "STACK_SIZE" if cc_semver >= (3, 1, 25) else "TOTAL_STACK"
env.Append(LINKFLAGS=["-s", "%s=%sKB" % (stack_size_opt, env["stack_size"])])
if env["threads"]:
# Thread support (via SharedArrayBuffer).
env.Append(CPPDEFINES=["PTHREAD_NO_RENAME"])
env.Append(CCFLAGS=["-s", "USE_PTHREADS=1"])
env.Append(LINKFLAGS=["-s", "USE_PTHREADS=1"])
env.Append(LINKFLAGS=["-s", "DEFAULT_PTHREAD_STACK_SIZE=%sKB" % env["default_pthread_stack_size"]])
env.Append(LINKFLAGS=["-s", "PTHREAD_POOL_SIZE=8"])
env.Append(LINKFLAGS=["-s", "WASM_MEM_MAX=2048MB"])
elif env["proxy_to_pthread"]:
print_warning('"threads=no" support requires "proxy_to_pthread=no", disabling proxy to pthread.')
env["proxy_to_pthread"] = False
if env["lto"] != "none":
# Workaround https://github.com/emscripten-core/emscripten/issues/19781.
if cc_semver >= (3, 1, 42) and cc_semver < (3, 1, 46):
env.Append(LINKFLAGS=["-Wl,-u,scalbnf"])
# Workaround https://github.com/emscripten-core/emscripten/issues/16836.
if cc_semver >= (3, 1, 47):
env.Append(LINKFLAGS=["-Wl,-u,_emscripten_run_callback_on_thread"])
if env["dlink_enabled"]:
if env["proxy_to_pthread"]:
print_warning("GDExtension support requires proxy_to_pthread=no, disabling proxy to pthread.")
env["proxy_to_pthread"] = False
if cc_semver < (3, 1, 14):
print_error("GDExtension support requires emscripten >= 3.1.14, detected: %s.%s.%s" % cc_semver)
sys.exit(255)
env.Append(CCFLAGS=["-s", "SIDE_MODULE=2"])
env.Append(LINKFLAGS=["-s", "SIDE_MODULE=2"])
env.Append(CCFLAGS=["-fvisibility=hidden"])
env.Append(LINKFLAGS=["-fvisibility=hidden"])
env.extra_suffix = ".dlink" + env.extra_suffix
# WASM_BIGINT is needed since emscripten ≥ 3.1.41
needs_wasm_bigint = cc_semver >= (3, 1, 41)
# Run the main application in a web worker
if env["proxy_to_pthread"]:
env.Append(LINKFLAGS=["-s", "PROXY_TO_PTHREAD=1"])
env.Append(CPPDEFINES=["PROXY_TO_PTHREAD_ENABLED"])
env.Append(LINKFLAGS=["-s", "EXPORTED_RUNTIME_METHODS=['_emscripten_proxy_main']"])
# https://github.com/emscripten-core/emscripten/issues/18034#issuecomment-1277561925
env.Append(LINKFLAGS=["-s", "TEXTDECODER=0"])
# BigInt support to pass object pointers between contexts
needs_wasm_bigint = True
if needs_wasm_bigint:
env.Append(LINKFLAGS=["-s", "WASM_BIGINT"])
# Reduce code size by generating less support code (e.g. skip NodeJS support).
env.Append(LINKFLAGS=["-s", "ENVIRONMENT=web,worker"])
# Wrap the JavaScript support code around a closure named Godot.
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"])
# Do not call main immediately when the support code is ready.
env.Append(LINKFLAGS=["-s", "INVOKE_RUN=0"])
# callMain for manual start, cwrap for the mono version.
env.Append(LINKFLAGS=["-s", "EXPORTED_RUNTIME_METHODS=['callMain','cwrap']"])
# Add code that allow exiting runtime.
env.Append(LINKFLAGS=["-s", "EXIT_RUNTIME=1"])
# This workaround creates a closure that prevents the garbage collector from freeing the WebGL context.
# We also only use WebGL2, and changing context version is not widely supported anyway.
env.Append(LINKFLAGS=["-s", "GL_WORKAROUND_SAFARI_GETCONTEXT_BUG=0"])
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