src/dawn/node/BUILD.gn

# Copyright 2025 The Dawn & Tint Authors
#
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice, this
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#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
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#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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import("../../../scripts/dawn_overrides_with_defaults.gni")

if (is_win) {
  _exe = ".exe"
} else {
  _exe = ""
}

# Directory in which to find node-addon-api
dawn_node_addon_api_dir = "$dawn_root/third_party/node-addon-api"

# Directory in which to find node-api-headers
dawn_node_api_headers_dir = "$dawn_root/third_party/node-api-headers"

# Path to the webgpu.idl definition file
dawn_webgpu_idl_path = "$dawn_root/third_party/gpuweb/webgpu.idl"

# Golang executable for running the IDL generator
dawn_go_executable = "$dawn_root/tools/golang/bin/go${_exe}"

# TODO(amaiorano): Figure out why path_exists doesn't work
# assert(path_exists(dawn_node_addon_api_dir) && path_exists(dawn_node_api_headers_dir) && path_exists(dawn_webgpu_idl_path), "dawn_build_node_bindings missing dependencies. Please follow the 'Fetch dependencies' instructions at: ./src/dawn/node/README.md")

dawn_node_gen_dir = target_gen_dir
interop_gen_dir = "$dawn_node_gen_dir/src/dawn/node/interop"

# TODO(amaiorano): Move run_built_binary.py to a common dir
run_built_binary_script =
    "$dawn_root/third_party/gn/dxc/build/run_built_binary.py"

config("common_config") {
  # Add include paths for Node API headers.
  include_dirs = [
    "${dawn_node_addon_api_dir}",
    "${dawn_node_api_headers_dir}/include",
  ]
}

template("idlgen") {
  assert(defined(invoker.template), "must set 'template'")
  assert(defined(invoker.output), "must set 'output'")
  assert(defined(invoker.idls), "must set 'idls'")

  action(target_name) {
    idlgen_tool_dir = "$dawn_root/tools/src/cmd/idlgen"
    inputs = [
               "$idlgen_tool_dir/main.go",
               invoker.template,
             ] + invoker.idls
    if (defined(invoker.depends)) {
      inputs += invoker.depends
    }
    outputs = [ invoker.output ]

    idls = []
    foreach(i, invoker.idls) {
      idls += [ rebase_path(i, root_build_dir) ]
    }

    script = run_built_binary_script
    args = [
             "",
             rebase_path(dawn_go_executable, root_build_dir),
             "run",
             rebase_path("$idlgen_tool_dir/main.go", root_build_dir),
             "--template",
             rebase_path(invoker.template, root_build_dir),
             "--output",
             rebase_path(invoker.output, root_build_dir),
           ] + idls
  }
}

idlgen("idlgen_webgpu_h") {
  template = "interop/WebGPU.h.tmpl"
  idls = [
    "interop/Browser.idl",
    dawn_webgpu_idl_path,
    "interop/DawnExtensions.idl",
  ]
  depends = [ "interop/WebGPUCommon.tmpl" ]
  output = "$interop_gen_dir/WebGPU.h"
}
idlgen("idlgen_webgpu_cpp") {
  template = "interop/WebGPU.cpp.tmpl"
  idls = [
    "interop/Browser.idl",
    dawn_webgpu_idl_path,
    "interop/DawnExtensions.idl",
  ]
  depends = [ "interop/WebGPUCommon.tmpl" ]
  output = "$interop_gen_dir/WebGPU.cpp"
}

static_library("dawn_node_interop") {
  public_configs = [ ":common_config" ]
  sources = [
    "$interop_gen_dir/WebGPU.cpp",
    "$interop_gen_dir/WebGPU.h",
    "interop/Core.cpp",
    "interop/Core.h",
    "interop/NodeAPI.h",
  ]
  include_dirs = [ "${dawn_node_gen_dir}" ]
  deps = [
    ":idlgen_webgpu_cpp",
    ":idlgen_webgpu_h",
    "$dawn_root/include/dawn:cpp_headers",
    "$dawn_root/src/utils",
  ]
}

static_library("dawn_node_binding") {
  public_configs = [ ":common_config" ]
  if (is_win) {
    # Use multibyte character set so that Win32 functions map the ANSI ones, not the UNICODE ones.
    configs -= [ "//build/config/win:unicode" ]
  }
  sources = [
    "binding/AsyncRunner.cpp",
    "binding/AsyncRunner.h",
    "binding/Converter.cpp",
    "binding/Converter.h",
    "binding/Errors.cpp",
    "binding/Errors.h",
    "binding/EventTarget.cpp",
    "binding/EventTarget.h",
    "binding/Flags.cpp",
    "binding/Flags.h",
    "binding/GPU.cpp",
    "binding/GPU.h",
    "binding/GPUAdapter.cpp",
    "binding/GPUAdapter.h",
    "binding/GPUAdapterInfo.cpp",
    "binding/GPUAdapterInfo.h",
    "binding/GPUBindGroup.cpp",
    "binding/GPUBindGroup.h",
    "binding/GPUBindGroupLayout.cpp",
    "binding/GPUBindGroupLayout.h",
    "binding/GPUBuffer.cpp",
    "binding/GPUBuffer.h",
    "binding/GPUCommandBuffer.cpp",
    "binding/GPUCommandBuffer.h",
    "binding/GPUCommandEncoder.cpp",
    "binding/GPUCommandEncoder.h",
    "binding/GPUComputePassEncoder.cpp",
    "binding/GPUComputePassEncoder.h",
    "binding/GPUComputePipeline.cpp",
    "binding/GPUComputePipeline.h",
    "binding/GPUDevice.cpp",
    "binding/GPUDevice.h",
    "binding/GPUPipelineLayout.cpp",
    "binding/GPUPipelineLayout.h",
    "binding/GPUQuerySet.cpp",
    "binding/GPUQuerySet.h",
    "binding/GPUQueue.cpp",
    "binding/GPUQueue.h",
    "binding/GPURenderBundle.cpp",
    "binding/GPURenderBundle.h",
    "binding/GPURenderBundleEncoder.cpp",
    "binding/GPURenderBundleEncoder.h",
    "binding/GPURenderPassEncoder.cpp",
    "binding/GPURenderPassEncoder.h",
    "binding/GPURenderPipeline.cpp",
    "binding/GPURenderPipeline.h",
    "binding/GPUSampler.cpp",
    "binding/GPUSampler.h",
    "binding/GPUShaderModule.cpp",
    "binding/GPUShaderModule.h",
    "binding/GPUSupportedFeatures.cpp",
    "binding/GPUSupportedFeatures.h",
    "binding/GPUSupportedLimits.cpp",
    "binding/GPUSupportedLimits.h",
    "binding/GPUTexture.cpp",
    "binding/GPUTexture.h",
    "binding/GPUTextureView.cpp",
    "binding/GPUTextureView.h",
    "binding/IteratorHelper.h",
    "binding/Split.cpp",
    "binding/Split.h",
    "binding/TogglesLoader.cpp",
    "binding/TogglesLoader.h",
  ]
  include_dirs = [ "${dawn_node_gen_dir}" ]
  public_deps = [ ":dawn_node_interop" ]
  deps = [
    "$dawn_root/src/dawn/native:native",
    "$dawn_root/src/dawn/utils:wgpu_utils",
  ]
}

action("gen_napi_symbols") {
  script = "gen_napi_symbols.py"
  args = [ rebase_path("$dawn_root/third_party/node-api-headers/symbols.js",
                       root_build_dir) ]
  if (is_win) {
    args +=
        [ rebase_path("$dawn_node_gen_dir/NapiSymbols.def", root_build_dir) ]
    outputs = [ "$dawn_node_gen_dir/NapiSymbols.def" ]
  } else {
    args += [ rebase_path("$dawn_node_gen_dir/NapiSymbols.h", root_build_dir) ]
    outputs = [ "$dawn_node_gen_dir/NapiSymbols.h" ]
  }
}

if (is_win) {
  import("//build/config/clang/clang.gni")
  action("napi_symbols_lib") {
    inputs = [ "$dawn_node_gen_dir/NapiSymbols.def" ]
    outputs = [ "$dawn_node_gen_dir/NapiSymbols.lib" ]
    script = run_built_binary_script
    linker = rebase_path("$clang_base_path/bin/lld-link${_exe}", root_build_dir)
    args = [
      "",
      linker,
      "/DEF:" + rebase_path(inputs[0], root_build_dir),
      "/OUT:" + rebase_path(outputs[0], root_build_dir),
    ]
    deps = [ ":gen_napi_symbols" ]
  }
}

copy("copy_index_js") {
  sources = [ "$dawn_root/src/dawn/node/index.js" ]
  outputs = [ "$root_build_dir/index.js" ]
}
copy("copy_cts_js") {
  sources = [ "$dawn_root/src/dawn/node/cts.js" ]
  outputs = [ "$root_build_dir/cts.js" ]
}

shared_library("dawn_node") {
  output_name = "dawn"
  output_extension = "node"
  output_prefix_override = true  # dawn.node, not libdawn.node
  public_configs = [ ":common_config" ]
  sources = [
    "ManualConstructors.cpp",
    "ManualConstructors.h",
    "Module.cpp",
  ]
  deps = [
    ":dawn_node_binding",
    ":gen_napi_symbols",
    "$dawn_root/src/dawn:proc",
  ]
  data_deps = [
    ":copy_cts_js",
    ":copy_index_js",
  ]
  if (is_win) {
    deps += [ ":napi_symbols_lib" ]
    ldflags =
        [ rebase_path("$dawn_node_gen_dir/NapiSymbols.lib", root_build_dir) ]
  } else {
    # Don't pass '-z,defs' linker arg when compiling weak symbols
    configs -= [ "//build/config/compiler:no_unresolved_symbols" ]

    # TODO(crbug.com/404499678): GN build doesn't like when weak functions have a definition
    defines = [ "NAPI_SYMBOL_WEAK_DECL_ONLY" ]
    if (is_mac) {
      # On mac, make undefined weak functions dynamic to bind with node functions at runtime
      ldflags = [ "-Wl,-undefined,dynamic_lookup" ]
    }
    sources += [ "NapiSymbols.cpp" ]
  }
  include_dirs = [ "${dawn_node_gen_dir}" ]
}