SDL{,2}: support building for android

This should be picking up the OpenGL ES headers provided by the NDK.
More testing is needed.

pkgs/development/libraries/SDL/default.nix

@@ -1,8 +1,9 @@
 { stdenv, config, libGLSupported, fetchurl, fetchpatch, pkgconfig, audiofile, libcap, libiconv
 , openglSupport ? libGLSupported, libGL, libGLU
-, alsaSupport ? stdenv.isLinux, alsaLib
+, alsaSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid, alsaLib
-, x11Support ? !stdenv.isCygwin, libXext, libICE, libXrandr
+, x11Support ? !stdenv.isCygwin && !stdenv.hostPlatform.isAndroid
-, pulseaudioSupport ? config.pulseaudio or stdenv.isLinux, libpulseaudio
+, libXext, libICE, libXrandr
+, pulseaudioSupport ? config.pulseaudio or stdenv.isLinux && !stdenv.hostPlatform.isAndroid, libpulseaudio
 , OpenGL, CoreAudio, CoreServices, AudioUnit, Kernel, Cocoa
 , cf-private
 }:
@@ -12,9 +13,6 @@
 
 with stdenv.lib;
 
-assert !stdenv.isDarwin -> alsaSupport || pulseaudioSupport;
-assert openglSupport -> (stdenv.isDarwin || x11Support && libGL != null && libGLU != null);
-
 stdenv.mkDerivation rec {
   name    = "SDL-${version}";
   version = "1.2.15";
@@ -30,18 +28,18 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "dev" ];
   outputBin = "dev"; # sdl-config
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkgconfig ]
+    ++ optional stdenv.isLinux libcap;
 
   propagatedBuildInputs = [ libiconv ]
     ++ optionals x11Support [ libXext libICE libXrandr ]
-    ++ optional stdenv.isLinux libcap
     ++ optionals openglSupport [ libGL libGLU ]
     ++ optional alsaSupport alsaLib
     ++ optional pulseaudioSupport libpulseaudio
     ++ optional stdenv.isDarwin Cocoa;
 
   buildInputs = [ ]
-    ++ optional (!stdenv.hostPlatform.isMinGW) audiofile
+    ++ optional (!stdenv.hostPlatform.isMinGW && alsaSupport) audiofile
     ++ optionals stdenv.isDarwin [
       AudioUnit CoreAudio CoreServices Kernel OpenGL
       # Needed for NSDefaultRunLoopMode symbols.

pkgs/development/libraries/SDL2/default.nix

@@ -1,12 +1,16 @@
 { stdenv, config, libGLSupported, fetchurl, pkgconfig
 , openglSupport ? libGLSupported, libGL
-, alsaSupport ? stdenv.isLinux, alsaLib
+, alsaSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid, alsaLib
-, x11Support ? !stdenv.isCygwin, libX11, xorgproto, libICE, libXi, libXScrnSaver, libXcursor, libXinerama, libXext, libXxf86vm, libXrandr
+, x11Support ? !stdenv.isCygwin && !stdenv.hostPlatform.isAndroid
-, waylandSupport ? stdenv.isLinux, wayland, wayland-protocols, libxkbcommon
+, libX11, xorgproto, libICE, libXi, libXScrnSaver, libXcursor
-, dbusSupport ? stdenv.isLinux, dbus
+, libXinerama, libXext, libXxf86vm, libXrandr
+, waylandSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid
+, wayland, wayland-protocols, libxkbcommon
+, dbusSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid, dbus
 , udevSupport ? false, udev
 , ibusSupport ? false, ibus
-, pulseaudioSupport ? config.pulseaudio or stdenv.isLinux, libpulseaudio
+, pulseaudioSupport ? config.pulseaudio or stdenv.isLinux && !stdenv.hostPlatform.isAndroid
+, libpulseaudio
 , AudioUnit, Cocoa, CoreAudio, CoreServices, ForceFeedback, OpenGL
 , audiofile, cf-private, libiconv
 }:
@@ -16,9 +20,6 @@
 
 with stdenv.lib;
 
-assert !stdenv.isDarwin -> alsaSupport || pulseaudioSupport;
-assert openglSupport -> (stdenv.isDarwin || x11Support && libGL != null);
-
 stdenv.mkDerivation rec {
   name = "SDL2-${version}";
   version = "2.0.9";
@@ -44,14 +45,14 @@ stdenv.mkDerivation rec {
     ++ optionals x11Support [ libX11 xorgproto ];
 
   dlopenBuildInputs = [ ]
-    ++ optional  alsaSupport alsaLib
+    ++ optionals  alsaSupport [ alsaLib audiofile ]
     ++ optional  dbusSupport dbus
     ++ optional  pulseaudioSupport libpulseaudio
     ++ optional  udevSupport udev
     ++ optionals waylandSupport [ wayland wayland-protocols libxkbcommon ]
     ++ optionals x11Support [ libICE libXi libXScrnSaver libXcursor libXinerama libXext libXrandr libXxf86vm ];
 
-  buildInputs = [ audiofile libiconv ]
+  buildInputs = [ libiconv ]
     ++ dlopenBuildInputs
     ++ optional  ibusSupport ibus
     ++ optionals stdenv.isDarwin [

pkgs/development/libraries/mesa-glu/default.nix

@@ -22,5 +22,6 @@ stdenv.mkDerivation rec {
     homepage = https://cgit.freedesktop.org/mesa/glu/;
     license = stdenv.lib.licenses.sgi-b-20;
     platforms = stdenv.lib.platforms.unix;
+    broken = stdenv.hostPlatform.isAndroid;
   };
 }

pkgs/top-level/all-packages.nix

@@ -11650,8 +11650,11 @@ in
 
   ## libGL/libGLU/Mesa stuff
 
-  # Default libGL implementation, should provide headers and libGL.so/libEGL.so/... to link agains them
+  # Default libGL implementation, should provide headers and
-  libGL = mesa_noglu.stubs;
+  # libGL.so/libEGL.so/... to link agains them. Android NDK provides
+  # an OpenGL implementation, we can just use that.
+  libGL = if stdenv.hostPlatform.useAndroidPrebuilt then stdenv
+          else mesa_noglu.stubs;
 
   # Default libGLU
   libGLU = mesa_glu;
@@ -12453,10 +12456,13 @@ in
 
   schroedinger = callPackage ../development/libraries/schroedinger { };
 
-  SDL = callPackage ../development/libraries/SDL {
+  SDL = callPackage ../development/libraries/SDL ({
     inherit (darwin) cf-private;
     inherit (darwin.apple_sdk.frameworks) OpenGL CoreAudio CoreServices AudioUnit Kernel Cocoa;
-  };
+  } // lib.optionalAttrs stdenv.hostPlatform.isAndroid {
+    # libGLU doesn’t work with Android’s SDL
+    libGLU = null;
+  });
 
   SDL_sixel = callPackage ../development/libraries/SDL_sixel { };