opengl: Update VirtualGL system (mostly for switch to meson build)

pkgs/opengl/default.nix

@@ -1,11 +1,11 @@
 # This override makes OpenGL just automagically work with VirtualGL
 #
-# Add a setup hook to the mesa_noglu package that automatically adds
-# a libvglfaker.so dependency to executables that depend on libGL.so.
+# Add a setup hook to the mesa package that automatically adds a
+# libvglfaker.so dependency to executables that depend on libGL.so.
 
 { super, stdenv, buildEnv, substituteAll, bash
 , autoreconfHook, pkgconfig, python2
-, xorg, llvmPackages, expat, mesa_glxgallium, mesa_noglu, libglvnd }:
+, xorg, llvmPackages, expat, mesa_glxgallium, mesa, libglvnd }:
 
 let
   autoVirtualGLHook =
@@ -23,7 +23,7 @@ let
         extraOutputsToInstall = [ "dev" ];
       };
 
-      virtualglLib = (super.virtualglLib.override { inherit libGLU_combined fltk; }).overrideAttrs (attrs: {
+      virtualglLib = (super.virtualglLib.override { inherit libGL libGLU fltk; }).overrideAttrs (attrs: {
         postFixup = attrs.postFixup or "" + ''
           patchelf --set-rpath /usr/lib${stdenv.lib.optionalString stdenv.is64bit "64"}/nvidia:"$(patchelf --print-rpath $out/lib/libvglfaker.so)" $out/lib/libvglfaker.so
         '';
@@ -41,52 +41,31 @@ in {
 
   # Mesa build for glxgallium software rendering (works with all X11 forwarding)
 
-  mesa_glxgallium = stdenv.mkDerivation rec {
-    version = super.mesa_noglu.version;
-    name = "mesa-glxgallium-${version}";
-    src = super.mesa_noglu.src;
-
-    outputs = [ "out" "dev" ];
-
-    configureFlags = [
-      "--with-gallium-drivers=swrast"
-      "--with-platforms=x11"           # surfaceless would make sense, but egl requires dri
-      "--disable-dri"
-      "--enable-glx=gallium-xlib"      # gallium-xlib requires no dri
-      "--enable-gallium-osmesa"
-      "--enable-llvm"
-      "--disable-egl"                  # egl requries dri for some reason
-      "--disable-gbm"                  # gbm requires dri for some reason
-      "--enable-llvm-shared-libs"
-      "--disable-opencl"
+  mesa_glxgallium = mesa.overrideAttrs (attrs: {
+    mesonFlags = attrs.mesonFlags ++ [
+      "-Dglx=gallium-xlib"
+      "-Ddri-drivers="
+      "-Dgallium-drivers=swrast"
+      "-Dglvnd=false"
+      "-Dgallium-nine=false"
     ];
 
-    nativeBuildInputs = [
-      autoreconfHook pkgconfig
-      python2
-    ];
-    propagatedBuildInputs = [ ];
-    buildInputs = [
-      llvmPackages.llvm
-      xorg.xorgproto xorg.libX11 xorg.libXext xorg.libxcb
-      expat
-    ];
+    # No dri drivers so need to drop all the "drivers" output code (ignoring vulkan for now)
+    outputs = [ "out" "dev" "osmesa" ];
 
-    enableParallelBuilding = true;
+    postInstall = ''
+      # move libOSMesa to $osmesa, as it's relatively big
+      mkdir -p $osmesa/lib
+        mv -t $osmesa/lib/ $out/lib/libOSMesa*
+    '';
+    postFixup = "";
+  } );
 
-    meta = with stdenv.lib; {
-      description = "An open source implementation of OpenGL";
-      homepage = https://www.mesa3d.org/;
-      license = licenses.mit; # X11 variant, in most files
-      platforms = platforms.linux;
-    };
-  };
-
-
-  # Duplicate mesa_noglu.stub with mesa_glxgallium stuffed in as the libGL source
+  # Duplicate mesa/stubs.nix with mesa_glxgallium stuffed in as the libGL source
 
   libGL = stdenv.mkDerivation {
-    name = "libGL-${libglvnd.version}";
+    inherit (libglvnd) version;
+    pname = "libGL";
     outputs = [ "out" "dev" ];
 
     nativeBuildInputs = [ xorg.lndir ];
@@ -100,7 +79,7 @@ in {
       mkdir -p $dev/{,lib/pkgconfig,nix-support}
       echo "$out" > $dev/nix-support/propagated-build-inputs
       echo ${autoVirtualGLHook} >> $dev/nix-support/propagated-build-inputs
-      ln -s ${mesa_noglu.dev}/include $dev/include
+      ln -s ${mesa.dev}/include $dev/include
 
       genPkgConfig() {
         local location="$1"
@@ -110,16 +89,16 @@ in {
         cat <<EOF >$dev/lib/pkgconfig/$name.pc
       Name: $name
       Description: $lib library
-      Version: ${mesa_noglu.version}
+      Version: ${mesa.version}
       Libs: -L$location/lib -l$lib
-      Cflags: -I${mesa_noglu.dev}/include
+      Cflags: -I${mesa.dev}/include
       EOF
       }
 
       genPkgConfig ${mesa_glxgallium.out} gl GL
       genPkgConfig ${libglvnd.out} egl EGL
-      genPkgConfig ${libglvnd.out} glesv1_cm GLESv1_CM
-      genPkgConfig ${libglvnd.out} glesv2 GLESv2
+      genPkgConfig ${mesa_glxgallium.out} glesv1_cm GLESv1_CM
+      genPkgConfig ${mesa_glxgallium.out} glesv2 GLESv2
     '';
   };
 }