libtxc_dxtn{,_s2tc}: remove from nixpkgs + hardware.opengl options

Context: discussion in https://github.com/NixOS/nixpkgs/pull/82630

Mesa has been supporting S3TC natively without requiring these libraries
since the S3TC patent expired in December 2017.

nixos/modules/hardware/opengl.nix

@@ -10,14 +10,6 @@ let
 
   videoDrivers = config.services.xserver.videoDrivers;
 
-  makePackage = p: pkgs.buildEnv {
-    name = "mesa-drivers+txc-${p.mesa.version}";
-    paths =
-      [ p.mesa.drivers
-        (if cfg.s3tcSupport then p.libtxc_dxtn else p.libtxc_dxtn_s2tc)
-      ];
-  };
-
   package = pkgs.buildEnv {
     name = "opengl-drivers";
     paths = [ cfg.package ] ++ cfg.extraPackages;
@@ -34,6 +26,9 @@ in
 
   imports = [
     (mkRenamedOptionModule [ "services" "xserver" "vaapiDrivers" ] [ "hardware" "opengl" "extraPackages" ])
+    (mkRemovedOptionModule [ "hardware" "opengl" "s3tcSupport" ] ''
+      S3TC support is now always enabled in Mesa.
+    '')
   ];
 
   options = {
@@ -74,17 +69,6 @@ in
         '';
       };
 
-      s3tcSupport = mkOption {
-        type = types.bool;
-        default = false;
-        description = ''
-          Make S3TC(S3 Texture Compression) via libtxc_dxtn available
-          to OpenGL drivers instead of the patent-free S2TC replacement.
-
-          Using this library may require a patent license depending on your location.
-        '';
-      };
-
       package = mkOption {
         type = types.package;
         internal = true;
@@ -166,8 +150,8 @@ in
     environment.sessionVariables.LD_LIBRARY_PATH = mkIf cfg.setLdLibraryPath
       ([ "/run/opengl-driver/lib" ] ++ optional cfg.driSupport32Bit "/run/opengl-driver-32/lib");
 
-    hardware.opengl.package = mkDefault (makePackage pkgs);
-    hardware.opengl.package32 = mkDefault (makePackage pkgs.pkgsi686Linux);
+    hardware.opengl.package = mkDefault pkgs.mesa.drivers;
+    hardware.opengl.package32 = mkDefault pkgs.pkgsi686Linux.mesa.drivers;
 
     boot.extraModulePackages = optional (elem "virtualbox" videoDrivers) kernelPackages.virtualboxGuestAdditions;
   };

pkgs/applications/misc/lutris/chrootenv.nix

@@ -94,7 +94,7 @@ in buildFHSUserEnv {
     libsndfile libtheora libogg libvorbis libopus libGLU libpcap libpulseaudio
     libao libusb libevdev udev libgcrypt libxml2 libusb libpng libmpeg2 libv4l
     libjpeg libxkbcommon libass libcdio libjack2 libsamplerate libzip libmad libaio
-    libcap libtiff libva libgphoto2 libxslt libtxc_dxtn libsndfile giflib zlib glib
+    libcap libtiff libva libgphoto2 libxslt libsndfile giflib zlib glib
     alsaLib zziplib bash dbus keyutils zip cabextract freetype unzip coreutils
     readline gcc SDL SDL2 curl graphite2 gtk2 gtk3 udev ncurses wayland libglvnd
     vulkan-loader xdg_utils sqlite gnutls libbsd

pkgs/development/libraries/libtxc_dxtn/default.nix

@@ -1,23 +0,0 @@
-{ stdenv, fetchurl, autoreconfHook, libGL, libGLU }:
-
-let version = "1.0.1"; in
-
-stdenv.mkDerivation rec {
-  pname = "libtxc_dxtn";
-  inherit version;
-
-  src = fetchurl {
-    url = "https://people.freedesktop.org/~cbrill/libtxc_dxtn/${pname}-${version}.tar.bz2";
-    sha256 = "0q5fjaknl7s0z206dd8nzk9bdh8g4p23bz7784zrllnarl90saa5";
-  };
-
-  nativeBuildInputs = [ autoreconfHook ];
-  buildInputs = [ libGL libGLU ];
-
-  meta = with stdenv.lib; {
-    homepage = "http://dri.freedesktop.org/wiki/S3TC";
-    repositories.git = "git://people.freedesktop.org/~mareko/libtxc_dxtn";
-    license = licenses.mit;
-    platforms = platforms.unix;
-  };
-}

pkgs/development/libraries/libtxc_dxtn_s2tc/default.nix

@@ -1,25 +0,0 @@
-{ stdenv, fetchurl, autoreconfHook, libGL, libGLU }:
-
-let version = "1.0"; in
-
-stdenv.mkDerivation {
-  pname = "libtxc_dxtn_s2tc";
-  inherit version;
-
-  src = fetchurl {
-    url = "https://github.com/divVerent/s2tc/archive/v${version}.tar.gz";
-    sha256 = "0ibfdib277fhbqvxzan0bmglwnsl1y1rw2g8skvz82l1sfmmn752";
-  };
-
-  nativeBuildInputs = [ autoreconfHook ];
-  buildInputs = [ libGL libGLU ];
-
-  meta = {
-    description = "A patent-free S3TC compatible implementation";
-    homepage = "https://github.com/divVerent/s2tc";
-    repositories.git = "https://github.com/divVerent/s2tc.git";
-    license = stdenv.lib.licenses.mit;
-    platforms = stdenv.lib.platforms.linux;
-    maintainers = [ stdenv.lib.maintainers.cpages ];
-  };
-}

pkgs/misc/emulators/wine/default.nix

@@ -9,7 +9,6 @@
 { lib, stdenv, callPackage,
   wineRelease ? "stable",
   wineBuild ? if stdenv.hostPlatform.system == "x86_64-linux" then "wineWow" else "wine32",
-  libtxc_dxtn_Name ? "libtxc_dxtn_s2tc",
   pngSupport ? false,
   jpegSupport ? false,
   tiffSupport ? false,
@@ -63,7 +62,6 @@ let wine-build = build: release:
 
 in if wineRelease == "staging" then
   callPackage ./staging.nix {
-    inherit libtxc_dxtn_Name;
     wineUnstable = wine-build wineBuild "unstable";
   }
 else

pkgs/misc/emulators/wine/staging.nix

@@ -1,4 +1,4 @@
-{ stdenv, callPackage, wineUnstable, libtxc_dxtn_Name }:
+{ stdenv, callPackage, wineUnstable }:
 
 with callPackage ./util.nix {};
 
@@ -8,7 +8,7 @@ let patch = (callPackage ./sources.nix {}).staging;
 in assert stdenv.lib.getVersion wineUnstable == patch.version;
 
 stdenv.lib.overrideDerivation wineUnstable (self: {
-  buildInputs = build-inputs [ "perl" "utillinux" "autoconf" libtxc_dxtn_Name ] self.buildInputs;
+  buildInputs = build-inputs [ "perl" "utillinux" "autoconf" ] self.buildInputs;
 
   name = "${self.name}-staging";
 

pkgs/top-level/aliases.nix

@@ -244,6 +244,8 @@ mapAliases ({
   librecad2 = librecad;  # backwards compatibility alias, added 2015-10
   libsysfs = sysfsutils; # added 2018-04-25
   libtidy = html-tidy;  # added 2014-12-21
+  libtxc_dxtn = throw "removed 2020-03-16, now integrated in Mesa";
+  libtxc_dxtn_s2tc = throw "removed 2020-03-16, now integrated in Mesa";
   libudev = udev; # added 2018-04-25
   libsexy = throw "libsexy has been removed from nixpkgs, as it's abandoned and no package needed it."; # 2019-12-10
   links = links2; # added 2016-01-31

pkgs/top-level/all-packages.nix

@@ -13272,10 +13272,6 @@ in
 
   libtsm = callPackage ../development/libraries/libtsm { };
 
-  libtxc_dxtn = callPackage ../development/libraries/libtxc_dxtn { };
-
-  libtxc_dxtn_s2tc = callPackage ../development/libraries/libtxc_dxtn_s2tc { };
-
   libgeotiff = callPackage ../development/libraries/libgeotiff { };
 
   libu2f-host = callPackage ../development/libraries/libu2f-host { };