Use rpi libcamera fork

overlays/libcamera.nix

@@ -1,6 +1,38 @@
 final: prev:
 {
+  libpisp = final.stdenv.mkDerivation {
+    name = "libpisp";
+    version = "1.0.5";
+    src = final.fetchFromGitHub {
+      owner = "raspberrypi";
+      repo = "libpisp";
+      rev = "v1.0.5";
+      hash = "sha256-CHd44CH5dBcZuK+5fZtONZ8HE/lwGKwK5U0BYUK8gG4=";
+    };
+
+    nativeBuildInputs = with final; [
+      pkg-config
+      meson
+      ninja
+    ];
+
+    buildInputs = with final; [
+      nlohmann_json
+      boost
+    ];
+
+    BOOST_INCLUDEDIR = "${prev.lib.getDev final.boost}/include";
+    BOOST_LIBRARYDIR = "${prev.lib.getLib final.boost}/lib";
+  };
+
   libcamera = prev.libcamera.overrideAttrs (old: {
+    src = final.fetchFromGitHub {
+      owner = "raspberrypi";
+      repo = "libcamera";
+      rev = "eb00c13d7c9f937732305d47af5b8ccf895e700f";
+      hash = "sha256-p0/inkHPRUkxSIsTmj7VI7sIaX7OXdqjMGZ31W7cnt4=";
+    };
+
     postPatch = ''
       patchShebangs utils/ src/py/
     '';
@@ -10,13 +42,19 @@ final: prev:
       ./0001-Ignore-IPA-signing.patch
     ];
 
+    buildInputs = old.buildInputs ++ (with final; [
+      libpisp
+      libglibutil
+    ]);
+
     mesonFlags = old.mesonFlags ++ [
       "--buildtype=release"
-      "-Dpipelines=rpi/vc4"
-      "-Dipas=rpi/vc4"
+      "-Dpipelines=rpi/vc4,rpi/pisp"
+      "-Dipas=rpi/vc4,rpi/pisp"
       "-Dgstreamer=enabled"
       "-Dtest=false"
       "-Dcam=enabled"
+      "-Dpycamera=disabled"
     ];
   });