dawn-cmake/scripts/dawn_features.gni

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# 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
Enable Vulkan for Chromium Fuchsia build. Enable the Vulkan backend when building Dawn with the Chromium build system for Fuchsia. To make this work properly the following is required: - Modify VulkanInfo.cpp and BackendVk.cpp to correctly probe the Fuchsia swapchain layer and its layer extension, as well as enabling them when creating a new VkInstance. - Modify VulkanFunctions.cpp to load the Fuchsia swapchain related extension for this platform only. - Provide a small mock GLFW library for Fuchsia under src/utils/Glfw3Fuchsia.cpp, since the upstream project does not support this platform at all. Its purpose is only to allow the creation of the right VulkanBinding instance, which depends on the creation of a display surface for latter swapchain creation. - Add //third_party/fuchsia-sdk:vulkan_base and //third_party/fuchsia-sdk:vulkan_validation as data_deps of the libdawn_native_sources target in order to ensure that the Fuchsia package created by the build system will include the correct Vulkan libraries (loader and validation layers). This builds correctly, and both dawn_unittests and dawn_end2end_tests will run on a real Fuchsia device or inside the Fuchsia emulator, using either GPU virtualization or a software-based renderer. Note: dawn_unittests will also run inside QEMU, but not dawn_end2end_tests, since the latter requires proper GPU emulation which is not available in this environment. NOTE: All end2end tests pass using a device with an "Intel HD Graphics 615 (Kaby Lake GT2)" adapter. However: - For some reason, a single test takes up to 129 seconds to pass (BufferSetSubDataTests.ManySetSubData/Vulkan). - The test process crashes inside VkDestroyInstance(), apparently inside the Fuchsia-specific imagepipe layer (which implements swapchain support). This is likely a bug in the layer itself, and not Dawn. Also, may end2end tests will crash when run inside the Fuchsia emulator (which uses GPU virtualization to talk to the host GPU). The crashes happen inside libvulkan-goldfish.so, the emulator-specific Vulkan ICD on this sytem. Not a Dawn bug either. Bug=dawn:221 Change-Id: Id3598b673e8c6393f24db728b8da49fdde3cac76 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8963 Commit-Queue: David Turner <digit@google.com> Reviewed-by: Austin Eng <enga@chromium.org>
2019-09-09 10:52:08 +00:00
dawn_enable_vulkan = is_linux || is_win || is_fuchsia
# 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
}