feat: adding the asahi configuration

hosts/asahi/apple-silicon-support/packages/mesa-asahi-edge/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, fetchFromGitLab
+, mesa
+}:
+
+(mesa.override {
+  galliumDrivers = [ "softpipe" "llvmpipe" "asahi" ];
+  vulkanDrivers = [ "swrast" "asahi" ];
+}).overrideAttrs (oldAttrs: {
+  version = "25.0.0-asahi";
+  src = fetchFromGitLab {
+    # tracking: https://pagure.io/fedora-asahi/mesa/commits/asahi
+    domain = "gitlab.freedesktop.org";
+    owner = "asahi";
+    repo = "mesa";
+    rev = "asahi-20241211";
+    hash = "sha256-Ny4M/tkraVLhUK5y6Wt7md1QBtqQqPDUv+aY4MpNA6Y=";
+  };
+
+  mesonFlags = let
+    badFlags = [
+      "-Dinstall-mesa-clc"
+      "-Dopencl-spirv"
+      "-Dgallium-nine"
+    ];
+    isBadFlagList = f: builtins.map (b: lib.hasPrefix b f) badFlags;
+    isGoodFlag = f: !(builtins.foldl' (x: y: x || y) false (isBadFlagList f));
+  in (builtins.filter isGoodFlag oldAttrs.mesonFlags) ++ [
+      # we do not build any graphics drivers these features can be enabled for
+      "-Dgallium-va=disabled"
+      "-Dgallium-vdpau=disabled"
+      "-Dgallium-xa=disabled"
+    ];
+
+  # replace patches with ones tweaked slightly to apply to this version
+  patches = [
+    ./opencl.patch
+  ];
+
+  postInstall = (oldAttrs.postInstall or "") + ''
+    # we don't build anything to go in this output but it needs to exist
+    touch $spirv2dxil
+  '';
+})

hosts/asahi/apple-silicon-support/packages/mesa-asahi-edge/opencl.patch

@@ -0,0 +1,72 @@
+From 01607231c06a2c2adf0eb63f2a49a33e65a2a592 Mon Sep 17 00:00:00 2001
+From: Thomas Watson <twatson52@icloud.com>
+Date: Sat, 30 Nov 2024 15:28:20 -0600
+Subject: [PATCH] opencl.patch from nixpkgs
+ abd1d7f93319df76c6fee7aee7ecd39ec6136d62
+
+---
+ meson.build                             | 2 +-
+ meson_options.txt                       | 6 ++++++
+ src/gallium/targets/opencl/meson.build  | 2 +-
+ src/gallium/targets/rusticl/meson.build | 2 +-
+ 4 files changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/meson.build b/meson.build
+index db2e404a3fc..108044b0949 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1857,7 +1857,7 @@ endif
+ 
+ dep_clang = null_dep
+ if with_clc or with_gallium_clover
+-  llvm_libdir = dep_llvm.get_variable(cmake : 'LLVM_LIBRARY_DIR', configtool: 'libdir')
++  llvm_libdir = get_option('clang-libdir')
+ 
+   dep_clang = cpp.find_library('clang-cpp', dirs : llvm_libdir, required : false)
+ 
+diff --git a/meson_options.txt b/meson_options.txt
+index 42e819dacd2..78da6e52976 100644
+--- a/meson_options.txt
++++ b/meson_options.txt
+@@ -29,6 +29,12 @@ option(
+   description : 'the window system EGL assumes for EGL_DEFAULT_DISPLAY',
+ )
+ 
++option(
++  'clang-libdir',
++  type : 'string',
++  value : '',
++  description : 'Locations to search for clang libraries.'
++)
+ option(
+   'android-stub',
+   type : 'boolean',
+diff --git a/src/gallium/targets/opencl/meson.build b/src/gallium/targets/opencl/meson.build
+index ab2c83556a8..a59e88e122f 100644
+--- a/src/gallium/targets/opencl/meson.build
++++ b/src/gallium/targets/opencl/meson.build
+@@ -56,7 +56,7 @@ if with_opencl_icd
+     configuration : _config,
+     input : 'mesa.icd.in',
+     output : 'mesa.icd',
+-    install : true,
++    install : false,
+     install_tag : 'runtime',
+     install_dir : join_paths(get_option('sysconfdir'), 'OpenCL', 'vendors'),
+   )
+diff --git a/src/gallium/targets/rusticl/meson.build b/src/gallium/targets/rusticl/meson.build
+index 2b214adbbf5..7f919397ad5 100644
+--- a/src/gallium/targets/rusticl/meson.build
++++ b/src/gallium/targets/rusticl/meson.build
+@@ -64,7 +64,7 @@ configure_file(
+   configuration : _config,
+   input : 'rusticl.icd.in',
+   output : 'rusticl.icd',
+-  install : true,
++  install : false,
+   install_tag : 'runtime',
+   install_dir : join_paths(get_option('sysconfdir'), 'OpenCL', 'vendors'),
+ )
+-- 
+2.47.0
+