nixpkgs/pkgs/development/libraries/mesa/stubs.nix
Gabriel Ebner 4bff6d04e4 libGL: use headers from glvnd
The glvnd library contains a copy of the OpenGL headers.  By compiling
against the glvnd headers we completely avoid a dependency on Mesa (and
LLVM).  This reduces rebuild time.  It also prevents accidents, such as
where some packages kept a reference to the mesa.drivers output and thus
had all Mesa drivers in their runtime closure.
2021-04-09 09:24:24 +02:00

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{ stdenv
, libglvnd, mesa
, OpenGL }:
stdenv.mkDerivation {
inherit (libglvnd) version;
pname = "libGL";
outputs = [ "out" "dev" ];
# On macOS, libglvnd is not supported, so we just use what mesa
# build. We need to also include OpenGL.framework, and some
# extra tricks to go along with. We add mesas libGLX to support
# the X extensions to OpenGL.
buildCommand = if stdenv.hostPlatform.isDarwin then ''
mkdir -p $out/nix-support $dev
echo ${OpenGL} >> $out/nix-support/propagated-build-inputs
ln -s ${mesa.out}/lib $out/lib
mkdir -p $dev/lib/pkgconfig $dev/nix-support
echo "$out" > $dev/nix-support/propagated-build-inputs
ln -s ${mesa.dev}/include $dev/include
cat <<EOF >$dev/lib/pkgconfig/gl.pc
Name: gl
Description: gl library
Version: ${mesa.version}
Libs: -L${mesa.out}/lib -lGL
Cflags: -I${mesa.dev}/include
EOF
cat <<EOF >$dev/lib/pkgconfig/glesv1_cm.pc
Name: glesv1_cm
Description: glesv1_cm library
Version: ${mesa.version}
Libs: -L${mesa.out}/lib -lGLESv1_CM
Cflags: -I${mesa.dev}/include
EOF
cat <<EOF >$dev/lib/pkgconfig/glesv2.pc
Name: glesv2
Description: glesv2 library
Version: ${mesa.version}
Libs: -L${mesa.out}/lib -lGLESv2
Cflags: -I${mesa.dev}/include
EOF
''
# Otherwise, setup gl stubs to use libglvnd.
else ''
mkdir -p $out/nix-support
ln -s ${libglvnd.out}/lib $out/lib
mkdir -p $dev/{,lib/pkgconfig,nix-support}
echo "$out ${libglvnd} ${libglvnd.dev}" > $dev/nix-support/propagated-build-inputs
ln -s ${libglvnd.dev}/include $dev/include
genPkgConfig() {
local name="$1"
local lib="$2"
cat <<EOF >$dev/lib/pkgconfig/$name.pc
Name: $name
Description: $lib library
Version: ${libglvnd.version}
Libs: -L${libglvnd.out}/lib -l$lib
Cflags: -I${libglvnd.dev}/include
EOF
}
genPkgConfig gl GL
genPkgConfig egl EGL
genPkgConfig glesv1_cm GLESv1_CM
genPkgConfig glesv2 GLESv2
'';
}