utils/bazel/vulkan_sdk.bzl

   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-exception
   4
   5 """Repository rule to statically link against the Vulkan SDK.
   6
   7 Requires installing the Vulkan SDK from https://vulkan.lunarg.com/.
   8
   9 If the Vulkan SDK is not installed, this generates an empty rule and you may
  10 encounter linker errors like `error: undefined reference to 'vkCreateInstance'`.
  11 """
  12
  13 def _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", """
  19 cc_library(
  20     name = "sdk",
  21     srcs = select({
  22         "@bazel_tools//src/conditions: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", """
  34 cc_library(
  35     name = "sdk",
  36     srcs = [],
  37     visibility = ["//visibility:public"],
  38 )""")
  39
  40 vulkan_sdk_setup = repository_rule(
  41     implementation = _impl,
  42     local = True,
  43 )