# Copyright (C) 2018-2019 The ANGLE Project Authors.
# Copyright (C) 2019-2023 LunarG, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("//build_overrides/build.gni")
import("//build_overrides/vulkan_loader.gni")

declare_args() {
  custom_vulkan_loader_library_name = ""
}

if (is_fuchsia) {
  import("//build/cpp/sdk_shared_library.gni")
  import("//build/sdk/sdk_documentation.gni")
}

if (!is_android) {
  vulkan_undefine_configs = []
}
if (is_win) {
  vulkan_undefine_configs += [
    "//build/config/win:nominmax",
    "//build/config/win:unicode",
  ]
}

config("vulkan_internal_config") {
  defines = [ "VK_ENABLE_BETA_EXTENSIONS" ]
  if (is_clang || !is_win) {
    cflags = [
      "-Wno-conversion",
      "-Wno-extra-semi",
      "-Wno-sign-compare",
      "-Wno-unreachable-code",
      "-Wno-unused-function",
      "-Wno-unused-variable",
    ]
  }
  if (is_fuchsia) {
    defines += [
      "SYSCONFDIR=\"/config\"",
      "EXTRASYSCONFDIR=\"/pkg/data\"",
    ]
  }
  if (is_linux || is_chromeos || is_mac) {
    defines += [
      "SYSCONFDIR=\"/etc\"",
      "FALLBACK_CONFIG_DIRS=\"/etc/xdg\"",
      "FALLBACK_DATA_DIRS=\"/usr/local/share:/usr/share\"",
    ]
  }
  if (is_apple && !vulkan_loader_shared) {
    defines += [ "APPLE_STATIC_LOADER" ]
  }
}

# Vulkan loader
# -------------

config("vulkan_loader_config") {
  include_dirs = [
    "loader/generated",
    "loader",
  ]
  defines = [
    "LOADER_USE_UNSAFE_FILE_SEARCH=1",
  ]

  if (is_win) {
    cflags = [ "/wd4201" ]
  }
  if (is_linux || is_chromeos) {
    # assume secure_getenv() is available
    defines += [
      "HAVE_SECURE_GETENV",
      "LOADER_ENABLE_LINUX_SORT",
    ]
  }
}

if (!is_android) {
  if (is_fuchsia) {
    library_type = "sdk_shared_library"
  } else if (vulkan_loader_shared) {
    library_type = "shared_library"
  } else {
    library_type = "static_library"
  }
  support_unknown_function_handling = false
  if (defined(ar_path) && ar_path != "" && !is_win && (current_cpu == "arm64" || current_cpu == "x86_64")) {
    support_unknown_function_handling = true
    static_library("asm_offset") {
      sources = [ "loader/asm_offset.c" ]
      deps = [
        "$vulkan_headers_dir:vulkan_headers",
      ]

      if (is_fuchsia) {
        deps += [
          ":dlopen_fuchsia",
        ]
      }

      # Output raw assembly instead of compiled object file. The assembly will be included as a member of the output ar file.
      cflags = [ "-S" ]
      configs += [ ":vulkan_internal_config" ]
      configs += [ ":vulkan_loader_config" ]
    }

    action("gen_defines") {
      script = "scripts/parse_asm_values.py"
      deps = [ ":asm_offset" ]

      inputs = [
        "$target_out_dir/libasm_offset.a",
        ar_path,
      ]
      if (current_cpu == "arm64") {
        cpu = "aarch64"
      } else {
        cpu = "x86_64"
      }
      args = [
        rebase_path("$target_gen_dir/gen_defines.asm", root_build_dir),
        rebase_path("$target_out_dir/libasm_offset.a", root_build_dir),
        "GAS",
        "Clang",
        cpu,
        rebase_path(ar_path, root_build_dir),
        "libasm_offset.asm_offset.c.o",
      ]
      outputs = [ "$target_gen_dir/gen_defines.asm" ]
    }
  }

  target(library_type, "libvulkan") {
    sources = [
      "loader/adapters.h",
      "loader/allocation.c",
      "loader/allocation.h",
      "loader/cJSON.c",
      "loader/cJSON.h",
      "loader/debug_utils.c",
      "loader/debug_utils.h",
      # Should only be linked when assembler is used
      # "loader/dev_ext_trampoline.c",
      "loader/extension_manual.c",
      "loader/extension_manual.h",
      "loader/generated/vk_layer_dispatch_table.h",
      "loader/generated/vk_loader_extensions.h",
      "loader/generated/vk_object_types.h",
      "loader/gpa_helper.h",
      "loader/gpa_helper.c",
      "loader/loader_common.h",
      "loader/loader_environment.c",
      "loader/loader_environment.h",
      "loader/loader.c",
      "loader/loader.h",
      "loader/log.c",
      "loader/log.h",
      # Should only be linked when assembler is used
      # "loader/phys_dev_ext.c",
      "loader/settings.c",
      "loader/settings.h",
      "loader/stack_allocation.h",
      "loader/terminator.c",
      "loader/trampoline.c",
      "loader/unknown_function_handling.h",
      "loader/unknown_function_handling.c",
      "loader/vk_loader_layer.h",
      "loader/vk_loader_platform.h",
      "loader/wsi.c",
      "loader/wsi.h",
    ]

    if (custom_vulkan_loader_library_name != "") {
      output_name = custom_vulkan_loader_library_name
    } else {
      if (is_win) {
        output_name = "vulkan-1"
      } else {
        output_name = "vulkan"

        # Create libvulkan.so.1 on Linux instead of libvulkan.so
        if ((is_linux || is_chromeos) && vulkan_loader_shared) {
          output_extension = "so.1"
        }
      }
    }

    if (is_win) {
      sources += [
        "loader/dirent_on_windows.c",
        "loader/dirent_on_windows.h",
        "loader/loader_windows.c",
        "loader/loader_windows.h",
        "loader/loader.rc",
        "loader/vulkan-1.def",
      ]
      if (!is_clang) {
        cflags = [
          "/wd4054",  # Type cast from function pointer
          "/wd4055",  # Type cast from data pointer
          "/wd4100",  # Unreferenced formal parameter
          "/wd4152",  # Nonstandard extension used (pointer conversion)
          "/wd4201",  # Nonstandard extension used: nameless struct/union
          "/wd4214",  # Nonstandard extension used: bit field types other than
                      # int
          "/wd4232",  # Nonstandard extension used: address of dllimport is not
                      # static
          "/wd4305",  # Type cast truncation
          "/wd4706",  # Assignment within conditional expression
          "/wd4996",  # Unsafe stdlib function
        ]
      }
      if (is_clang) {
        cflags = [ "-Wno-incompatible-pointer-types" ]
      }
      libs = [ "Cfgmgr32.lib" ]
    }
    if (is_linux || is_chromeos) {
      sources += [
        "loader/loader_linux.c",
        "loader/loader_linux.h",
      ]
    }
    if (is_mac) {
      frameworks = [ "CoreFoundation.framework" ]
    }
    public_deps = [ "$vulkan_headers_dir:vulkan_headers" ]
    configs -= [ "//build/config/compiler:chromium_code" ]
    configs += [ "//build/config/compiler:no_chromium_code" ]
    configs += [ ":vulkan_internal_config" ]
    public_configs = [ ":vulkan_loader_config" ]
    configs -= vulkan_undefine_configs

    if (is_fuchsia) {
      category = "partner"

      # The Vulkan loader's interface is defined by standard Khronos vulkan headers
      # which can be obtained separately from the loader implementation itself.
      no_headers = true

      deps = [
        ":dlopen_fuchsia",
        "//sdk/lib/fdio",
      ]

      runtime_deps = [ "//sdk/lib/fdio:fdio_sdk" ]
    }
    if (support_unknown_function_handling) {
      if (current_cpu == "arm64") {
        sources += [ "loader/unknown_ext_chain_gas_aarch.S" ]
      } else if (current_cpu == "x86_64") {
        sources += [ "loader/unknown_ext_chain_gas_x86.S" ]
      } else {
        assert(false, "Unexpected CPU $current_cpu")
      }

      defines += ["UNKNOWN_FUNCTIONS_SUPPORTED=1"]
      deps += [ ":gen_defines" ]
      include_dirs = [ "$target_gen_dir" ]
    }
  }
}

if (is_fuchsia) {
  source_set("dlopen_fuchsia") {
    sources = [
      "loader/dlopen_fuchsia.c",
      "loader/dlopen_fuchsia.h",
    ]

    deps = [
      "//sdk/fidl/fuchsia.vulkan.loader:fuchsia.vulkan.loader_c_client",
      "//sdk/lib/fdio",
    ]
  }

  sdk_documentation("vulkan_license") {
    name = "vulkan_license"
    category = "public"

    files = [
      {
        source = "LICENSE.txt"
        dest = "LICENSE.vulkan"
      },
    ]
  }
}