The API is implemented in javascript, and generates C functions that can be called from godot. This allows much cleaner code replacing all `EM_ASM` calls in our C++ code with plain C function calls. This also gets rid of few hacks and comes with few optimizations (e.g. custom cursor shapes should be much faster now).
174 lines
6.4 KiB
Python
174 lines
6.4 KiB
Python
import os
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from emscripten_helpers import run_closure_compiler, create_engine_file, add_js_libraries
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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 helper method for adding libraries.
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env.AddMethod(add_js_libraries, "AddJSLibraries")
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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']"])
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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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