# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/toolchain/clang.gni")
import("//flutter/common/config.gni")
import("//flutter/shell/gpu/gpu.gni")
import("//flutter/shell/platform/embedder/embedder.gni")
import("//flutter/testing/testing.gni")

declare_args() {
  embedder_enable_software = shell_enable_software
  embedder_enable_vulkan = shell_enable_vulkan
  embedder_enable_gl = shell_enable_gl
  embedder_enable_metal = shell_enable_metal
}

shell_gpu_configuration("embedder_gpu_configuration") {
  enable_software = embedder_enable_software
  enable_vulkan = embedder_enable_vulkan
  enable_gl = embedder_enable_gl
  enable_metal = embedder_enable_metal
}

_framework_binary_subpath = "Versions/A/FlutterEmbedder"

# Template for the embedder build. Used to allow building it multiple times with
# different flags.
template("embedder_source_set") {
  forward_variables_from(invoker, "*")

  source_set(target_name) {
    sources = [
      "embedder.cc",
      "embedder_engine.cc",
      "embedder_engine.h",
      "embedder_external_texture_resolver.cc",
      "embedder_external_texture_resolver.h",
      "embedder_external_view.cc",
      "embedder_external_view.h",
      "embedder_external_view_embedder.cc",
      "embedder_external_view_embedder.h",
      "embedder_include.c",
      "embedder_include2.c",
      "embedder_layers.cc",
      "embedder_layers.h",
      "embedder_platform_message_response.cc",
      "embedder_platform_message_response.h",
      "embedder_render_target.cc",
      "embedder_render_target.h",
      "embedder_render_target_cache.cc",
      "embedder_render_target_cache.h",
      "embedder_struct_macros.h",
      "embedder_surface.cc",
      "embedder_surface.h",
      "embedder_surface_software.cc",
      "embedder_surface_software.h",
      "embedder_task_runner.cc",
      "embedder_task_runner.h",
      "embedder_thread_host.cc",
      "embedder_thread_host.h",
      "platform_view_embedder.cc",
      "platform_view_embedder.h",
      "vsync_waiter_embedder.cc",
      "vsync_waiter_embedder.h",
    ]

    if (embedder_enable_gl) {
      sources += [
        "embedder_external_texture_gl.cc",
        "embedder_external_texture_gl.h",
        "embedder_surface_gl.cc",
        "embedder_surface_gl.h",
      ]
    }

    deps = [
      ":embedder_gpu_configuration",
      "//flutter/assets",
      "//flutter/common",
      "//flutter/common/graphics",
      "//flutter/flow",
      "//flutter/fml",
      "//flutter/lib/ui",
      "//flutter/runtime:libdart",
      "//flutter/shell/common",
      "//flutter/third_party/tonic",
      "//third_party/dart/runtime/bin:dart_io_api",
      "//third_party/dart/runtime/bin:elf_loader",
      "//third_party/skia",
    ]

    if (embedder_enable_metal) {
      sources += [
        "embedder_external_texture_metal.h",
        "embedder_external_texture_metal.mm",
        "embedder_surface_metal.h",
        "embedder_surface_metal.mm",
      ]

      cflags_objc = flutter_cflags_objc
      cflags_objcc = flutter_cflags_objcc

      deps += [ "//flutter/shell/platform/darwin/graphics" ]
    }

    public_deps = [ ":embedder_headers" ]

    public_configs += [
      ":embedder_gpu_configuration_config",
      "//flutter:config",
    ]
  }
}

embedder_source_set("embedder") {
  public_configs = []
}

embedder_source_set("embedder_as_internal_library") {
  public_configs = [ ":embedder_internal_library_config" ]
}

source_set("embedder_headers") {
  public = [ "embedder.h" ]

  public_configs = [ "//flutter:config" ]
}

source_set("embedder_test_utils") {
  public = [ "test_utils/proc_table_replacement.h" ]

  deps = [ ":embedder_headers" ]

  public_configs = [ "//flutter:config" ]
}

# For using the embedder API as internal implementation detail of an
# embedding.
config("embedder_internal_library_config") {
  defines = [
    # Use prefixed symbols to avoid collisions with higher level API.
    "FLUTTER_API_SYMBOL_PREFIX=Embedder",

    # Don't export the embedder.h API surface.
    "FLUTTER_NO_EXPORT",
  ]
}

test_fixtures("fixtures") {
  dart_main = "fixtures/main.dart"
  fixtures = [
    "fixtures/arc_end_caps.png",
    "fixtures/compositor.png",
    "fixtures/compositor_root_surface_xformation.png",
    "fixtures/compositor_software.png",
    "fixtures/compositor_with_platform_layer_on_bottom.png",
    "fixtures/compositor_with_root_layer_only.png",
    "fixtures/dpr_noxform.png",
    "fixtures/dpr_xform.png",
    "fixtures/gradient.png",
    "fixtures/gradient_metal.png",
    "fixtures/external_texture_metal.png",
    "fixtures/gradient_xform.png",
    "fixtures/scene_without_custom_compositor.png",
    "fixtures/scene_without_custom_compositor_with_xform.png",
    "fixtures/snapshot_large_scene.png",
    "fixtures/verifyb143464703.png",
    "fixtures/verifyb143464703_soft_noxform.png",
  ]
}

if (enable_unittests) {
  executable("embedder_unittests") {
    testonly = true

    configs += [
      ":embedder_gpu_configuration_config",
      "//flutter:export_dynamic_symbols",
    ]

    include_dirs = [ "." ]

    sources = [
      "tests/embedder_a11y_unittests.cc",
      "tests/embedder_config_builder.cc",
      "tests/embedder_config_builder.h",
      "tests/embedder_test.cc",
      "tests/embedder_test.h",
      "tests/embedder_test_backingstore_producer.cc",
      "tests/embedder_test_backingstore_producer.h",
      "tests/embedder_test_compositor.cc",
      "tests/embedder_test_compositor.h",
      "tests/embedder_test_compositor_software.cc",
      "tests/embedder_test_compositor_software.h",
      "tests/embedder_test_context.cc",
      "tests/embedder_test_context.h",
      "tests/embedder_test_context_software.cc",
      "tests/embedder_test_context_software.h",
      "tests/embedder_unittests.cc",
      "tests/embedder_unittests_util.cc",
    ]

    deps = [
      ":embedder",
      ":embedder_gpu_configuration",
      ":fixtures",
      "//flutter/flow",
      "//flutter/lib/ui",
      "//flutter/runtime",
      "//flutter/testing",
      "//flutter/testing:dart",
      "//flutter/testing:skia",
      "//flutter/third_party/tonic",
      "//third_party/dart/runtime/bin:elf_loader",
      "//third_party/skia",
    ]

    if (test_enable_gl) {
      sources += [
        "tests/embedder_test_compositor_gl.cc",
        "tests/embedder_test_compositor_gl.h",
        "tests/embedder_test_context_gl.cc",
        "tests/embedder_test_context_gl.h",
        "tests/embedder_unittests_gl.cc",
      ]

      deps += [ "//flutter/testing:opengl" ]
    }

    if (test_enable_metal) {
      sources += [
        "tests/embedder_test_context_metal.cc",
        "tests/embedder_test_context_metal.h",
        "tests/embedder_unittests_metal.mm",
      ]

      deps += [ "//flutter/testing:metal" ]
    }
  }

  # Tests the build in FLUTTER_ENGINE_NO_PROTOTYPES mode.
  executable("embedder_proctable_unittests") {
    testonly = true

    configs += [
      ":embedder_gpu_configuration_config",
      "//flutter:export_dynamic_symbols",
    ]

    sources = [ "tests/embedder_unittests_proctable.cc" ]

    defines = [ "FLUTTER_ENGINE_NO_PROTOTYPES" ]
    if (is_win) {
      libs = [ "psapi.lib" ]
    }

    deps = [
      ":embedder",
      ":embedder_gpu_configuration",
      ":fixtures",
      "//flutter/testing",

      #"//flutter/testing:dart",
      #"//flutter/testing:skia",
      #"//flutter/third_party/tonic",
      #"//third_party/dart/runtime/bin:elf_loader",
      #"//third_party/skia",
    ]
  }
}

shared_library("flutter_engine_library") {
  visibility = [ ":*" ]

  output_name = "flutter_engine"

  if (is_mac && !embedder_for_target) {
    ldflags = [ "-Wl,-install_name,@rpath/FlutterEmbedder.framework/$_framework_binary_subpath" ]
  }

  deps = [ ":embedder" ]

  public_configs = [ "//flutter:config" ]
}

copy("copy_headers") {
  visibility = [ ":*" ]
  sources = [ "embedder.h" ]
  outputs = [ "$root_out_dir/flutter_embedder.h" ]
}

if (is_mac && !embedder_for_target) {
  _flutter_embedder_framework_dir = "$root_out_dir/FlutterEmbedder.framework"

  copy("copy_framework_headers") {
    visibility = [ ":*" ]
    sources = [ "embedder.h" ]
    outputs = [
      "$_flutter_embedder_framework_dir/Versions/A/Headers/FlutterEmbedder.h",
    ]
  }

  copy("copy_icu") {
    visibility = [ ":*" ]
    sources = [ "//third_party/icu/flutter/icudtl.dat" ]
    outputs =
        [ "$_flutter_embedder_framework_dir/Versions/A/Resources/icudtl.dat" ]
  }

  action("copy_info_plist") {
    script = "//flutter/build/copy_info_plist.py"
    visibility = [ ":*" ]
    sources = [ "assets/EmbedderInfo.plist" ]
    outputs =
        [ "$_flutter_embedder_framework_dir/Versions/A/Resources/Info.plist" ]
    args = [
      rebase_path(sources[0]),
      rebase_path(outputs[0]),
      "--bitcode=$enable_bitcode",
    ]
  }

  copy("copy_module_map") {
    visibility = [ ":*" ]
    sources = [ "assets/embedder.modulemap" ]
    outputs = [
      "$_flutter_embedder_framework_dir/Versions/A/Modules/module.modulemap",
    ]
  }

  copy("copy_dylib") {
    visibility = [ ":*" ]

    sources = [ "$root_out_dir/libflutter_engine.dylib" ]
    outputs = [ "$_flutter_embedder_framework_dir/$_framework_binary_subpath" ]

    deps = [ ":flutter_engine_library" ]
  }

  action("generate_symlinks") {
    visibility = [ ":*" ]
    script = "//build/config/mac/package_framework.py"
    outputs = [ "$root_build_dir/FlutterEmbedder.stamp" ]
    args = [
      "--framework",
      "FlutterEmbedder.framework",
      "--version",
      "A",
      "--contents",
      "FlutterEmbedder",
      "Resources",
      "Headers",
      "Modules",
      "--stamp",
      "FlutterEmbedder.stamp",
    ]
    deps = [
      ":copy_dylib",
      ":copy_framework_headers",
      ":copy_icu",
      ":copy_info_plist",
      ":copy_module_map",
    ]
  }

  group("flutter_embedder_framework") {
    visibility = [ ":*" ]
    deps = [ ":generate_symlinks" ]
  }
}

group("flutter_engine") {
  deps = []

  build_embedder_api =
      current_toolchain == host_toolchain || embedder_for_target

  if (build_embedder_api) {
    # All platforms require the embedder dylib and headers.
    deps += [
      ":copy_headers",
      ":flutter_engine_library",
    ]

    # For the Mac, the dylib is packaged in a framework with the appropriate headers.
    if (is_mac && !embedder_for_target) {
      deps += [ ":flutter_embedder_framework" ]
    }
  }
}