gpu rework

hardware/gpu/cuda.nix

@@ -2,12 +2,18 @@
 {
   # assumes common-gpu-nvidia from nixos-hardware is also added
   # TODO: should we move it from flake.nix to here?
+  # https://github.com/NixOS/nixos-hardware/blob/master/common/gpu/nvidia/default.nix
+  # https://github.com/NixOS/nixos-hardware/blob/master/common/gpu/nvidia/prime.nix
 
-  # https://nixos.wiki/wiki/Nvidia
+  hardware.opengl.enable = true;
+  hardware.opengl.driSupport = true;
+  hardware.opengl.driSupport32Bit = true;
 
-  #https://nixpk.gs/pr-tracker.html?pr=235481
+  nixpkgs.config.openglSupport = true; # why is this not set by hardware.opengl.enable ?
-  #nixpkgs.config.cudaSupport = true; # TODO: TOO SLOW, BREAKS
+  nixpkgs.config.cudaSupport = true; # TODO: TOO SLOW, BREAKS
-  #nixpkgs.config.nvidiaSupport = true; # TODO: slow? used only by zenith
+  nixpkgs.config.vdpauSupport  = true;
+  nixpkgs.config.vaapiSupport  = true;
+  nixpkgs.config.nvidiaSupport = true; # TODO: slow? used only by zenith
 
   nixpkgs.config.allowUnfreePredicate = pkg: lib.any (x: x) [
     (lib.hasInfix "nvidia"  (lib.toLower (lib.getName pkg)))
@@ -16,23 +22,21 @@
     (lib.hasInfix "cublas"  (lib.toLower (lib.getName pkg)))
   ];
 
-  hardware.opengl.enable = true;
+  # https://nixos.wiki/wiki/Nvidia
-  hardware.opengl.driSupport = true;
+
-  hardware.opengl.driSupport32Bit = true;
   hardware.opengl.extraPackages = [
-    #pkgs.vaapiVdpau
+    #pkgs.vaapiVdpau # added by nixos-hardware
     #pkgs.libvdpau-va-gl
     pkgs.nvidia-vaapi-driver
   ];
 
-
   hardware.nvidia.modesetting.enable = lib.mkDefault true; # needed for most wayland compositors
   hardware.nvidia.nvidiaSettings = lib.mkDefault true;
 
   virtualisation.docker.enableNvidia = lib.mkDefault true;
   virtualisation.podman.enableNvidia = lib.mkDefault true;
 
-  # only do this per-host
+  # only do these per-host
 
   #hardware.nvidia.open = lib.mkDefault true; # open source version of kernel module, only on driver 515.43.04+
   #hardware.nvidia.powerManagement.enable = lib.mkDefault true; # Fix graphical corruption on suspend/resume
@@ -44,7 +48,6 @@
   #hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.latest;
   #hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.beta;
 
-  # add this to the host in question:
   #hardware.nvidia.prime = {
   #  offload.enable = true;
   #  # Bus IDs. You can find them using lspci, grepping for "3D" or "VGA"
@@ -52,7 +55,6 @@
   #  nvidiaBusId = "PCI:1:0:0";
   #};
 
-
   environment.systemPackages = [
     pkgs.nvtop-nvidia
   ] ++ lib.optionals config.hardware.nvidia.prime.offload.enable [

hardware/gpu/rocm.nix

@@ -2,31 +2,26 @@
 {
   # assumes common-gpu-amd from nixos-hardware is also added
   # TODO: should we move it from flake.nix to here?
-
-  # nixos-hardware common-amd options
   # https://github.com/NixOS/nixos-hardware/blob/master/common/gpu/amd/default.nix
-  hardware.amdgpu.opencl = true;
-  hardware.amdgpu.amdvlk = true;
 
   hardware.opengl.enable = true;
-  # https://libreddit.noximilien.pbsds.net/r/archlinux/comments/nih9c9/amdgpu_vs_modesetting_in_current_510_kernels_xorg/
-  services.xserver.videoDrivers = [ "amdgpu" ]; # use gpu, adaptive sync and and hardware page flipping
-  #services.xserver.videoDrivers = [ "modesetting" ]; # integrated (non-accelerated) framebuffer, KMS
   hardware.opengl.driSupport = true;
   hardware.opengl.driSupport32Bit = true;
-  hardware.opengl.extraPackages = [
-    pkgs.rocm-opencl-icd
-    (if (lib.versionOlder (lib.versions.majorMinor lib.version) "23.11")
-      then pkgs.rocm-runtime#-ext
-      else pkgs.rocmPackages.rocm-runtime
-    )
-  ];
 
   nixpkgs.config.openglSupport = true; # why is this not set by hardware.opengl.enable ?
   nixpkgs.config.rocmSupport = true;
   nixpkgs.config.vdpauSupport  = true;
   nixpkgs.config.vaapiSupport  = true;
 
+  # nixos-hardware common-amd options
+  # https://github.com/NixOS/nixos-hardware/blob/master/common/gpu/amd/default.nix
+  hardware.amdgpu.opencl = lib.mkDefault true;
+  hardware.amdgpu.amdvlk = lib.mkDefault false;
+
+  # https://libreddit.noximilien.pbsds.net/r/archlinux/comments/nih9c9/amdgpu_vs_modesetting_in_current_510_kernels_xorg/
+  services.xserver.videoDrivers = [ "amdgpu" ]; # use gpu, adaptive sync and and hardware page flipping
+  #services.xserver.videoDrivers = [ "modesetting" ]; # integrated (non-accelerated) framebuffer, KMS  (default in nixos-hardware)
+
   # https://nixos.wiki/wiki/AMD_GPU#HIP
   systemd.tmpfiles.rules = let
     hip = if (lib.versionOlder (lib.versions.majorMinor lib.version) "23.11")