shaderc.rb

class Shaderc < Formula
  desc "Collection of tools, libraries, and tests for Vulkan shader compilation"
  homepage "https://github.com/google/shaderc"
  license "Apache-2.0"

  stable do # Last buildable version on macOS <10.15
    url "https://github.com/google/shaderc/archive/refs/tags/v2023.3.tar.gz"
    sha256 "6cbb041245bcfbf349954dc99c7e93608d3d9dd0c13dc891182b58eb255c848b"

    resource "glslang" do
      # https://github.com/google/shaderc/blob/known-good/known_good.json
      url "https://github.com/KhronosGroup/glslang.git",
          revision: "ef77cf3a92490f7c37f36f20263cd3cd8c94f009"
    end

    resource "spirv-headers" do
      # https://github.com/google/shaderc/blob/known-good/known_good.json
      url "https://github.com/KhronosGroup/SPIRV-Headers.git",
          revision: "1feaf4414eb2b353764d01d88f8aa4bcc67b60db"
    end

    resource "spirv-tools" do
      # https://github.com/google/shaderc/blob/known-good/known_good.json
      url "https://github.com/KhronosGroup/SPIRV-Tools.git",
          revision: "44d72a9b36702f093dd20815561a56778b2d181e"
    end
  end

  head do
    url "https://github.com/google/shaderc.git", branch: "main"

    resource "glslang" do
      url "https://github.com/KhronosGroup/glslang.git", branch: "main"
    end

    resource "spirv-tools" do
      url "https://github.com/KhronosGroup/SPIRV-Tools.git", branch: "main"
    end

    resource "spirv-headers" do
      url "https://github.com/KhronosGroup/SPIRV-Headers.git", branch: "main"
    end
  end

  depends_on "cmake" => :build
  depends_on "python@3.13" => :build

  def install
    ENV.append "CFLAGS", (Hardware::CPU.arm? ? "-mcpu=native" : "-march=native -mtune=native") + " -Ofast -flto=thin"

    resources.each do |res|
      res.stage(buildpath/"third_party"/res.name)
    end

    # Avoid installing packages that conflict with other formulae.
    inreplace "third_party/CMakeLists.txt", "${SHADERC_SKIP_INSTALL}", "ON"
    system "cmake", "-S", ".", "-B", "build",
                    "-DSHADERC_SKIP_TESTS=ON",
                    "-DSKIP_GLSLANG_INSTALL=ON",
                    "-DSKIP_SPIRV_TOOLS_INSTALL=ON",
                    "-DSKIP_GOOGLETEST_INSTALL=ON",
                    *std_cmake_args
    system "cmake", "--build", "build"
    system "cmake", "--install", "build"
  end

  test do
    (testpath/"test.c").write <<~EOS
      #include <shaderc/shaderc.h>
      int main() {
        int version;
        shaderc_profile profile;
        if (!shaderc_parse_version_profile("450core", &version, &profile))
          return 1;
        return (profile == shaderc_profile_core) ? 0 : 1;
      }
    EOS
    system ENV.cc, "-o", "test", "test.c", "-I#{include}",
                   "-L#{lib}", "-lshaderc_shared"
    system "./test"
  end
end