dawn-cmake/scripts/dawn_features.gni

# Copyright 2018 The Dawn Authors
#
# 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
#
#     http://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.

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 D3D12 backend
  dawn_enable_d3d12 = is_win

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

  # 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_opengl = is_linux && !is_chromeos

  # Enables the compilation of Dawn's Vulkan backend
  dawn_enable_vulkan = is_linux || is_win || is_fuchsia || is_android

  # Enable use of reflection compiler in spirv-cross. This is needed
  # if performing reflection on systems that the platform language
  # shader is SPIR-V, since there isn't an instance of the
  # GLSL/HLSL/MSL compiler. This implicitly pulls in the GLSL
  # compiler, since it is a sub-class of if.
  dawn_enable_cross_reflection = false

  # Enables usage of swiftshader on the Vulkan backend.
  # Note that this will only work in standalone and in projects that set the
  # dawn_swiftshader_dir variable in build_overrides/dawn.gni
  # Because of how the Vulkan loader works, setting this make Dawn only able
  # to find the Swiftshader ICD and not the others.
  dawn_use_swiftshader = false
}

# 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 Vulkan validation layers
  dawn_enable_vulkan_validation_layers =
      dawn_enable_vulkan && ((is_linux && !is_chromeos) || is_win)
}