scripts/dawn_features.gni

# Copyright 2018 The Dawn & Tint Authors
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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

if (build_with_chromium) {
  import("//build/config/ozone.gni")
  import("//build/config/sanitizers/sanitizers.gni")

  dawn_use_x11 = ozone_platform_x11
  dawn_use_wayland = false
} else {
  declare_args() {
    # Whether Dawn should enable X11 support.
    dawn_use_x11 = is_linux && !is_chromeos
    dawn_use_wayland = false
  }
}

# Enable the compilation for UWP
dawn_is_winuwp = is_win && target_os == "winuwp"
dawn_use_windows_ui = is_win

declare_args() {
  # TODO(dawn:1545): Re-enable dawn_use_angle on Android. In non-component
  # builds, this is adding a dependency on ANGLE's libEGL.so and
  # libGLESv2.so, apparently without regard for the use_static_angle=true
  # GN variable. Chromium's linker on Android disallows production of more
  # than one shared object per target (?).
  dawn_use_angle = !is_android

  # Enables SwiftShader as the fallback adapter. Requires dawn_swiftshader_dir
  # to be set to take effect.
  # TODO(dawn:1536): Enable SwiftShader for Android.
  dawn_use_swiftshader = !is_android && !is_ios

  # Whether we allow building DXC.
  # DXC requires SM6.0+ which is blocklisted on x86,
  # and arm64 support is not implemented yet.
  # See crbug.com/tint/1753.
  dawn_use_built_dxc = is_win && target_cpu != "x86" && target_cpu != "arm64"
}

declare_args() {
  # Enable Dawn's ASSERTs even in release builds
  dawn_always_assert = false

  # Should the Dawn static libraries be fully linked vs. GN's default of
  # treating them as source sets. This is useful for people using Dawn
  # standalone to produce static libraries to use in their projects.
  dawn_complete_static_libs = false

  # Enables the compilation of Dawn's D3D11 backend
  dawn_enable_d3d11 = is_win

  # Enables the compilation of Dawn's D3D12 backend
  dawn_enable_d3d12 = is_win

  # Enables the compilation of Dawn's Metal backend
  dawn_enable_metal = is_mac || is_ios

  # Enables the compilation of Dawn's Null backend
  # (required for unittests, obviously non-conformant)
  dawn_enable_null = true

  # Enables the compilation of Dawn's OpenGL backend
  # (best effort, non-conformant)
  dawn_enable_desktop_gl = is_linux && !is_chromeos

  # Enables the compilation of Dawn's OpenGLES backend
  # (WebGPU/Compat subset)
  # Disables OpenGLES when compiling for UWP, since UWP only supports d3d
  dawn_enable_opengles =
      (is_linux && !is_chromeos) || (is_win && !dawn_is_winuwp)

  # Enables the compilation of Dawn's Vulkan backend
  # Disables vulkan when compiling for UWP, since UWP only supports d3d
  dawn_enable_vulkan = is_linux || is_chromeos || (is_win && !dawn_is_winuwp) ||
                       is_fuchsia || is_android || dawn_use_swiftshader

  # Enables error injection for faking failures to native API calls
  dawn_enable_error_injection =
      is_debug || (build_with_chromium && use_fuzzing_engine)
}

# GN does not allow reading a variable defined in the same declare_args().
# Put them in two separate declare_args() when setting the value of one
# argument based on another.
declare_args() {
  # Uses our built version of the Vulkan validation layers
  dawn_enable_vulkan_validation_layers =
      dawn_enable_vulkan && ((is_linux && !is_chromeos) || is_win || is_mac)

  # Uses our built version of the Vulkan loader on platforms where we can't
  # assume to have one present at the system level.
  dawn_enable_vulkan_loader =
      dawn_enable_vulkan && (is_mac || (is_linux && !is_android))

  # Disable SPIR-V validation on Android because it adds a significant amount
  # to the binary size, and Tint's output should be well-formed.
  dawn_enable_spirv_validation = dawn_enable_vulkan && !is_android
}

# UWP only supports CoreWindow for windowing
dawn_supports_glfw_for_windowing =
    (is_win && !dawn_is_winuwp) || (is_linux && !is_chromeos) || is_mac

# Much of the GL backend code is shared, so define a convenience var.
dawn_enable_opengl = dawn_enable_opengles || dawn_enable_desktop_gl