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1# This file is licensed under the Apache License v2.0 with LLVM Exceptions.2# See https://llvm.org/LICENSE.txt for license information.3# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception4 5"""Repository rule to statically link against the Vulkan SDK.6 7Requires installing the Vulkan SDK from https://vulkan.lunarg.com/.8 9If the Vulkan SDK is not installed, this generates an empty rule and you may10encounter linker errors like `error: undefined reference to 'vkCreateInstance'`.11"""12 13def _impl(repository_ctx):14 if "VULKAN_SDK" in repository_ctx.os.environ:15 sdk_path = repository_ctx.os.environ["VULKAN_SDK"]16 repository_ctx.symlink(sdk_path, "vulkan-sdk")17 18 repository_ctx.file("BUILD", """19cc_library(20 name = "sdk",21 srcs = select({22 "@platforms//os:windows": [23 "vulkan-sdk/Lib/vulkan-1.lib"24 ],25 "//conditions:default": [26 "vulkan-sdk/lib/libvulkan.so.1",27 ],28 }),29 visibility = ["//visibility:public"],30)""")31 else:32 # Empty rule. Will fail to link for just targets that use Vulkan.33 repository_ctx.file("BUILD", """34cc_library(35 name = "sdk",36 srcs = [],37 visibility = ["//visibility:public"],38)""")39 40vulkan_sdk_setup = repository_rule(41 implementation = _impl,42 local = True,43)44