local drivers

modules/nixos/hw/hw-graphics.ulu.nix

@@ -45,7 +45,7 @@
             extraPackages = [
               wayland-intel-vaapi-driver
               pkgs.libvdpau-va-gl
-              pkgs.pocl
+              # OpenCL (GPU + CPU): pocl-gen7 in hw-ivb-drivers
             ];
             extraPackages32 = [
               wayland-intel-vaapi-driver-32

modules/nixos/hw/hw-ivb-drivers.ulu.nix

@@ -0,0 +1,115 @@
+{ ... }:
+{
+  flake.nixosModules.hw-ivb-drivers =
+    { pkgs, ... }:
+    let
+      drivers =
+        p: arch:
+        p.stdenv.mkDerivation {
+          pname = "ivb-drivers";
+          version = "fork";
+          src = ../../../drivers/ivb + "/${arch}";
+
+          nativeBuildInputs = [ p.autoPatchelfHook ];
+          buildInputs = with p; [
+            libdrm
+            zstd
+            expat
+            libxcb
+            libx11
+            libxshmfence
+            xcbutilkeysyms
+            wayland
+            llvmPackages_21.llvm.lib
+            llvmPackages_21.libclang.lib
+            spirv-llvm-translator
+            stdenv.cc.cc.lib
+          ];
+          dontStrip = true; # stripped by meson install
+
+          installPhase = ''
+            runHook preInstall
+            mkdir -p $out/lib/d3d $out/share/vulkan/icd.d
+            install -m 0755 libvulkan_intel_hasvk13.so $out/lib/
+            install -m 0755 d3dadapter9.so.1 $out/lib/d3d/
+            ln -s d3dadapter9.so.1 $out/lib/d3d/d3dadapter9.so
+
+            cat > $out/share/vulkan/icd.d/intel_hasvk_ivb_icd.${arch}.json <<EOF
+            {
+                "ICD": {
+                    "api_version": "1.3.352",
+                    "library_arch": "${if arch == "x86_64" then "64" else "32"}",
+                    "library_path": "$out/lib/libvulkan_intel_hasvk13.so"
+                },
+                "file_format_version": "1.0.1"
+            }
+            EOF
+
+            if [ -f libRusticlOpenCL.so.1 ]; then
+              install -m 0755 libRusticlOpenCL.so.1 $out/lib/
+              mkdir -p $out/etc/OpenCL/vendors
+              echo $out/lib/libRusticlOpenCL.so.1 > $out/etc/OpenCL/vendors/rusticl-ivb.icd
+            fi
+            runHook postInstall
+          '';
+        };
+
+      withoutHasvk =
+        mesa:
+        pkgs.symlinkJoin {
+          name = "${mesa.name}-without-hasvk";
+          paths = [ mesa ];
+          postBuild = ''
+            rm -f $out/share/vulkan/icd.d/intel_hasvk_icd.*.json
+          '';
+        };
+
+      # pocl with the gen7 device (OpenCL on the HD 4000) and the host CPU
+      # device, from Drivers/pocl-gen7/release.sh. The gen7 device finds
+      # libgbe and beignet's library in lib/beignet next to itself.
+      pocl-gen7 = pkgs.stdenv.mkDerivation {
+        pname = "pocl-gen7";
+        version = "release";
+        src = ../../../drivers/pocl-gen7;
+
+        nativeBuildInputs = [ pkgs.autoPatchelfHook ];
+        buildInputs = with pkgs; [
+          libdrm
+          hwloc
+          zlib
+          zstd
+          libxml2
+          llvmPackages_21.llvm.lib
+          llvmPackages_21.clang-unwrapped.lib # libgbe: libclang-cpp
+          stdenv.cc.cc.lib
+        ];
+        dontStrip = true; # stripped by release.sh
+
+        installPhase = ''
+          runHook preInstall
+          mkdir -p $out/etc/OpenCL/vendors
+          cp -a lib share $out/
+          echo $out/lib/libpocl.so.2 > $out/etc/OpenCL/vendors/pocl-gen7.icd
+          runHook postInstall
+        '';
+      };
+    in
+    {
+      hardware.graphics = {
+        package = withoutHasvk pkgs.mesa;
+        package32 = withoutHasvk pkgs.pkgsi686Linux.mesa;
+        extraPackages = [
+          (drivers pkgs "x86_64")
+          pocl-gen7
+        ];
+        extraPackages32 = [ (drivers pkgs.pkgsi686Linux "i686") ];
+      };
+      # sessionVariables: set through PAM for the whole session, so every
+      # shell (nushell too) and every program started from it sees them
+      environment.sessionVariables = {
+        RUSTICL_ENABLE = "crocus";
+        # pocl builds basic and pthread (both the CPU); the GPU comes first
+        POCL_DEVICES = "gen7 pthread";
+      };
+    };
+}