Package request: slang

[ArchercatNEO]

Project description

Slang is a shading language now maintained by khronos intended to make shader programming easier and more maintainable.
slangc is the official compiler for the language.

Metadata

• homepage URL: https://shader-slang.com/
• source URL: https://github.com/shader-slang/slang
• license: apache 2.0 with llvm exception
• platforms: x86_64 and aarch64 on linux and darwin

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[pluiedev]

I've tried my hand at this and it's not a particularly hard build if you use vendored dependencies, but let's try to avoid doing that in Nixpkgs if possible.

Right now I've figured out how to de-vendor miniz and lz4, though unordered_dense needs to be packaged first, and then for some bizarre reason it wants to link against vulkan-headers despite it being header-only, and then it couldn't find system spirv-headers. CUDA & NVAPI support would probably also be important.

Regarding #359938 (@ArchercatNEO), I think something like shader-slang would work for now, although the name is definitely up for debate.

My partial derivation:

{
  lib,
  llvmPackages_13,
  fetchFromGitHub,

  cmake,
  ninja,
  pkg-config,
  python3,
  tree,

  libllvm,
  miniz,
  lz4,
  vulkan-headers,
  spirv-headers,
  xorg,

  enableCUDA ? false,
}:
let 
  inherit (llvmPackages_13) stdenv;

  lz4-static = lz4.overrideAttrs (prev: {
    outputs = ["out"];
    cmakeFlags = (prev.cmakeFlags or []) ++ [
      (lib.cmakeBool "LZ4_BUNDLED_MODE" true)
    ];
    installPhase = ''
      runHook preInstall
      install -D liblz4.a $out/lib/liblz4_static.a
      runHook postInstall
    '';
  });
in
stdenv.mkDerivation (finalAttrs: {
  pname = "slang";
  version = "2024.14.6";

  src = fetchFromGitHub {
    owner = "shader-slang";
    repo = "slang";
    rev = "refs/tags/v${finalAttrs.version}";
    # hash = "sha256-ynq1YGgXD9f6+/lJSt4kFfs2N4QfzoyHOBbMT+4Flt4=";
    # TODO: fix this
    hash = "sha256-q/FR7CA3FddbHBmINOqQqfmOhlusswv3femKFax2AnM=";
    fetchSubmodules = true;
  };

  nativeBuildInputs = [
    cmake
    ninja
    pkg-config
    python3
    # llvmPackages_13.lld
  ];

  buildInputs = [
    llvmPackages_13.libllvm
    llvmPackages_13.libclang
    miniz
    lz4.dev
    lz4-static
    vulkan-headers
    spirv-headers

    # TODO: nvcc, OptiX, NVAPI, Aftermath
  ] ++ lib.optional stdenv.hostPlatform.isLinux xorg.libX11;

  cmakeFlags = [
    (lib.cmakeFeature "SLANG_VERSION_FULL" "${finalAttrs.version}")
    (lib.cmakeFeature "SLANG_SLANG_LLVM_FLAVOR" "USE_SYSTEM_LLVM")
    # (lib.cmakeBool "SLANG_USE_SYSTEM_UNORDERED_DENSE" true)
    (lib.cmakeBool "SLANG_USE_SYSTEM_MINIZ" true)
    (lib.cmakeBool "SLANG_USE_SYSTEM_LZ4" true)
    # (lib.cmakeBool "SLANG_USE_SYSTEM_VULKAN_HEADERS" true) # Wants to link against Vulkan-Headers
    # (lib.cmakeBool "SLANG_USE_SYSTEM_SPIRV_HEADERS" true) # Missing Cmake
    (lib.cmakeFeature "SLANG_SPIRV_HEADERS_INCLUDE_DIR" "${spirv-headers}/include")
  ];

  env.NIX_CFLAGS_COMPILE = toString [
    "-I${miniz}/include/miniz"
  ];
})

[ArchercatNEO]

Interesting, though I can’t find nvcc with nix-locate as of now, optix requires that, nvapi is (apparently) windows-only and I didn’t look for aftermath. This definitely seems like a drv that’s better made than mine though so congrats on that.

[niklaskorz]

See #358202