Add nix derivations for some shader packs

.packwizignore

@@ -8,3 +8,4 @@ flake.nix
 flake.lock
 .envrc
 .direnv/
+nix/

flake.nix

@@ -10,5 +10,7 @@
         buildInputs = with pkgs; [ packwiz ];
       };
     });
+    packages = eachSystem (system: let pkgs = import nixpkgs { inherit system; };
+    in pkgs.callPackages ./nix/packages { });
   };
 }

nix/packages/default.nix

@@ -0,0 +1,6 @@
+{ callPackage }:
+let
+  shaders = callPackage ./shaders.nix {};
+in {
+  inherit (shaders) bliss-dh complementary-reimagined-dh rethinking-voxels-dh;
+}

nix/packages/shaders.nix

@@ -0,0 +1,47 @@
+{ stdenvNoCC, fetchFromGitHub, zip }:
+let
+  makeShaderPackage = {
+    name,
+    src,
+  }: stdenvNoCC.mkDerivation {
+    inherit name src;
+    phases = [ "installPhase" ];
+    buildInputs = [ zip ];
+    installPhase = ''
+      cd "$src"
+      mkdir -p "$out"
+      zip -r "$out/${name}.zip" .
+    '';
+  };
+in
+{
+  bliss-dh = makeShaderPackage {
+    name = "Bliss-DH";
+    src = fetchFromGitHub {
+      owner = "X0nk";
+      repo = "Bliss-Shader";
+      rev = "1cd49fe249db4cfeb102283fdc068e9cc1549e3e";
+      hash = "sha256-0R+aebM2Cztkdj4020CUTr9ABwFyG9nEu7Op0K9k6+w=";
+    };
+  };
+
+  complementary-reimagined-dh = makeShaderPackage {
+    name = "ComplementaryReimagined-DH";
+    src = fetchFromGitHub {
+      owner = "Steveplays28";
+      repo = "ComplementaryReimagined";
+      rev = "c5cb31757c27550ae30b9c462fe3ed1993b39d9d";
+      hash = "sha256-1HOscJ8afNC7t4yiobJBJgom7pDpwZPdA3B3EILlyWY=";
+    };
+  };
+
+  rethinking-voxels-dh = makeShaderPackage {
+    name = "RethinkingVoxels-DH";
+    src = fetchFromGitHub {
+      owner = "Steveplays28";
+      repo = "ComplementaryReimagined";
+      rev = "343915b7b18e1d83187fae1ea1f14eac90d4d09d";
+      hash = "sha256-Hu+JeINQC09OS1WY1kpagoRH5Awnp4YhacWusQgRsqc=";
+    };
+  };
+}