| # 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({ |
| "@platforms//os: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, |
| ) |
