Corentin Wallez 74cebd6879 Allow using swiftshader with the Vulkan backend
This adds swiftshader as a dependency of Dawn, and when it is present
dawn_use_swiftshader=true will force usage of it. (due to a Vulkan
loader limitation we can't have both regular drivers and swiftshader in
the same VkInstance).

BUG=dawn:283

Change-Id: Ib94f4dcca652eb380e994f007cdcfb145b1a5102
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/13440
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
2019-11-26 18:21:51 +00:00

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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.
# These are variables that are overridable by projects that include Dawn.
# The values in this file are the defaults for when we are building from
# Dawn's repository.
# Whether we are building from Dawn's repository.
# MUST be unset in other projects (will default to false).
dawn_standalone = true
# Defaults for these are set again in dawn_overrides_with_defaults.gni so that
# users of Dawn don't have to set dirs if they happen to use the same as Dawn.
# The paths to Dawn's dependencies
dawn_jinja2_dir = "//third_party/jinja2"
dawn_glfw_dir = "//third_party/glfw"
dawn_googletest_dir = "//third_party/googletest"
dawn_jsoncpp_dir = "//third_party/jsoncpp"
dawn_shaderc_dir = "//third_party/shaderc"
dawn_spirv_tools_dir = "//third_party/SPIRV-Tools"
dawn_spirv_cross_dir = "//third_party/spirv-cross"
dawn_swiftshader_dir = "//third_party/swiftshader"
dawn_vulkan_validation_layers_dir = "//third_party/vulkan-validation-layers"