Add Bazel build configuration files.

In order to avoid potential build failures that could arise from
SPIRV-Tools/Headers, and to avoid reading known_good.json, this build
configuration does not build the SPIRV-Tools dependency and hence cannot
perform HLSL compilation to SPIR-V.

BUILD.bazel

@@ -0,0 +1,240 @@
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+# Description:
+#
+# Khronos reference front-end for GLSL and ESSL, and sample SPIR-V generator.
+
+licenses(["notice"])  # Mixed: BSD, MIT, Khronos, Apache 2.0
+
+exports_files(["LICENSE"])
+
+COMMON_COPTS = [
+    "-Wall",
+    "-Wuninitialized",
+    "-Wunused",
+    "-Wunused-local-typedefs",
+    "-Wunused-parameter",
+    "-Wunused-value",
+    "-Wunused-variable",
+    "-Wno-reorder",
+    "-std=c++11",
+    "-fvisibility=hidden",
+    "-fvisibility-inlines-hidden",
+    "-fno-exceptions",
+    "-fno-rtti",
+]
+
+cc_library(
+    name = "glslang",
+    srcs = glob(
+        [
+            "glslang/GenericCodeGen/*.cpp",
+            "glslang/MachineIndependent/*.cpp",
+            "glslang/MachineIndependent/preprocessor/*.cpp",
+            "hlsl/*.cpp",
+        ],
+        exclude = [
+            "glslang/MachineIndependent/pch.cpp",
+            "glslang/MachineIndependent/pch.h",
+            "hlsl/pch.cpp",
+            "hlsl/pch.h",
+        ],
+    ) + [
+        "OGLCompilersDLL/InitializeDll.cpp",
+        "glslang/OSDependent/Unix/ossource.cpp",
+    ],
+    hdrs = glob([
+        "glslang/Include/*.h",
+        "glslang/MachineIndependent/*.h",
+        "glslang/MachineIndependent/preprocessor/*.h",
+        "hlsl/*.h",
+    ]) + [
+        "OGLCompilersDLL/InitializeDll.h",
+        "StandAlone/DirStackFileIncluder.h",
+        "glslang/OSDependent/osinclude.h",
+        "glslang/Public/ShaderLang.h",
+    ],
+    copts = COMMON_COPTS,
+    defines = [
+        "AMD_EXTENSIONS",
+        "ENABLE_HLSL=0",
+        "ENABLE_OPT=0",
+        "GLSLANG_OSINCLUDE_UNIX",
+        "NV_EXTENSIONS",
+    ],
+    linkopts = [
+        "-lm",
+        "-lpthread",
+    ],
+    linkstatic = 1,
+)
+
+genrule(
+    name = "export_spirv_headers",
+    srcs = [
+        "SPIRV/GLSL.ext.AMD.h",
+        "SPIRV/GLSL.ext.EXT.h",
+        "SPIRV/GLSL.ext.KHR.h",
+        "SPIRV/GLSL.ext.NV.h",
+        "SPIRV/GLSL.std.450.h",
+        "SPIRV/spirv.hpp",
+    ],
+    outs = [
+        "include/SPIRV/GLSL.ext.AMD.h",
+        "include/SPIRV/GLSL.ext.EXT.h",
+        "include/SPIRV/GLSL.ext.KHR.h",
+        "include/SPIRV/GLSL.ext.NV.h",
+        "include/SPIRV/GLSL.std.450.h",
+        "include/SPIRV/spirv.hpp",
+    ],
+    cmd = "mkdir -p $(@D)/include/SPIRV && cp $(SRCS) $(@D)/include/SPIRV/",
+)
+
+cc_library(
+    name = "SPIRV_headers",
+    hdrs = [":export_spirv_headers"],
+    copts = COMMON_COPTS,
+    includes = [
+        "include",
+        "include/SPIRV",
+    ],
+    linkstatic = 1,
+)
+
+cc_library(
+    name = "SPIRV",
+    srcs = glob(
+        ["SPIRV/*.cpp"],
+        exclude = [
+            "SPIRV/SpvTools.cpp",
+        ],
+    ),
+    hdrs = [
+        "SPIRV/GlslangToSpv.h",
+        "SPIRV/Logger.h",
+        "SPIRV/SPVRemapper.h",
+        "SPIRV/SpvBuilder.h",
+        "SPIRV/SpvTools.h",
+        "SPIRV/bitutils.h",
+        "SPIRV/disassemble.h",
+        "SPIRV/doc.h",
+        "SPIRV/hex_float.h",
+        "SPIRV/spvIR.h",
+    ],
+    copts = COMMON_COPTS,
+    includes = ["SPIRV"],
+    linkopts = ["-lm"],
+    linkstatic = 1,
+    deps = [
+        ":SPIRV_headers",
+        ":glslang",
+    ],
+)
+
+cc_library(
+    name = "glslang-default-resource-limits",
+    srcs = ["StandAlone/ResourceLimits.cpp"],
+    hdrs = ["StandAlone/ResourceLimits.h"],
+    copts = COMMON_COPTS,
+    linkstatic = 1,
+    deps = [":glslang"],
+)
+
+cc_binary(
+    name = "glslangValidator",
+    srcs = [
+        "StandAlone/StandAlone.cpp",
+        "StandAlone/Worklist.h",
+    ],
+    copts = COMMON_COPTS,
+    deps = [
+        ":SPIRV",
+        ":glslang",
+        ":glslang-default-resource-limits",
+    ],
+)
+
+cc_binary(
+    name = "spirv-remap",
+    srcs = ["StandAlone/spirv-remap.cpp"],
+    copts = COMMON_COPTS,
+    deps = [
+        ":SPIRV",
+        ":glslang",
+        ":glslang-default-resource-limits",
+    ],
+)
+
+filegroup(
+    name = "test_files",
+    srcs = glob(
+        ["Test/**"],
+        exclude = [
+            "Test/bump",
+            "Test/glslangValidator",
+            "Test/runtests",
+        ],
+    ),
+)
+
+filegroup(
+    name = "test_dir",
+    srcs = ["Test"],
+)
+
+cc_library(
+    name = "glslang_test_lib",
+    testonly = 1,
+    srcs = [
+        "gtests/HexFloat.cpp",
+        "gtests/Initializer.h",
+        "gtests/Settings.cpp",
+        "gtests/Settings.h",
+        "gtests/TestFixture.cpp",
+        "gtests/TestFixture.h",
+        "gtests/main.cpp",
+    ],
+    copts = COMMON_COPTS,
+    data = [":test_files"],
+    defines = [
+        'GLSLANG_TEST_DIRECTORY=\\"\\"',
+    ],
+    linkstatic = 1,
+    deps = [
+        ":SPIRV",
+        ":glslang",
+        ":glslang-default-resource-limits",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+GLSLANG_TESTS = glob(
+    ["gtests/*.FromFile.cpp"],
+    # Since we are not building the SPIRV-Tools dependency, the following tests
+    # cannot be performed.
+    exclude = [
+        "gtests/Hlsl.FromFile.cpp",
+        "gtests/Spv.FromFile.cpp",
+    ],
+)
+
+[cc_test(
+    name = test_file.replace("gtests/", "").replace(".FromFile.cpp", "") + "_test",
+    srcs = [test_file],
+    args = [
+        "--test-root",
+        "$(location :test_dir)",
+    ],
+    copts = COMMON_COPTS,
+    data = [
+        ":test_dir",
+        ":test_files",
+    ],
+    deps = [
+        ":SPIRV",
+        ":glslang",
+        ":glslang_test_lib",
+    ],
+) for test_file in GLSLANG_TESTS]

WORKSPACE

@@ -0,0 +1,27 @@
+workspace(name = "org_khronos_glslang")
+load(
+    "@bazel_tools//tools/build_defs/repo:http.bzl",
+    "http_archive",
+)
+
+http_archive(
+    name = "com_google_googletest",
+    sha256 = "ef9e2e12e7bf115ee48b427ae171fc869eeaf1b532c0fcfd982f6a353d2471b4",
+    strip_prefix = "googletest-37ae1fc5e6be26f367d76c078beabd7024fed53a",
+    urls = ["https://github.com/google/googletest/archive/37ae1fc5e6be26f367d76c078beabd7024fed53a.zip"],  # 2018-07-16
+)
+
+http_archive(
+    name = "com_googlesource_code_re2",
+    sha256 = "b885bb965ab4b6cf8718bbb8154d8f6474cd00331481b6d3e390babb3532263e",
+    strip_prefix = "re2-e860767c86e577b87deadf24cc4567ea83c4f162/",
+    urls = ["https://github.com/google/re2/archive/e860767c86e577b87deadf24cc4567ea83c4f162.zip"],
+)
+
+http_archive(
+    name = "com_google_effcee",
+    build_file = "BUILD.effcee.bazel",
+    sha256 = "b0c21a01995fdf9792510566d78d5e7fe6f83cb4ba986eba691f4926f127cb34",
+    strip_prefix = "effcee-8f0a61dc95e0df18c18e0ac56d83b3fa9d2fe90b/",
+    urls = ["https://github.com/google/effcee/archive/8f0a61dc95e0df18c18e0ac56d83b3fa9d2fe90b.zip"],
+)