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# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""Repository rule to statically link against the Vulkan SDK.
Requires installing the Vulkan SDK from https://vulkan.lunarg.com/.
If the Vulkan SDK is not installed, this generates an empty rule and you may
encounter linker errors like `error: undefined reference to 'vkCreateInstance'`.
"""
def _impl(repository_ctx):
if "VULKAN_SDK" in repository_ctx.os.environ:
sdk_path = repository_ctx.os.environ["VULKAN_SDK"]
repository_ctx.symlink(sdk_path, "vulkan-sdk")
repository_ctx.file("BUILD", """
cc_library(
name = "sdk",
srcs = select({
"@bazel_tools//src/conditions:windows": [
"vulkan-sdk/Lib/vulkan-1.lib"
],
"//conditions:default": [
"vulkan-sdk/lib/libvulkan.so.1",
],
}),
visibility = ["//visibility:public"],
)""")
else:
# Empty rule. Will fail to link for just targets that use Vulkan.
repository_ctx.file("BUILD", """
cc_library(
name = "sdk",
srcs = [],
visibility = ["//visibility:public"],
)""")
vulkan_sdk_setup = repository_rule(
implementation = _impl,
local = True,
)
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