Bundle Linux dependencies

Also clean up `extconf.rb` generally and add new `rake dev` task to use user-installed libraries.

1 files changed, 110 insertions, 29 deletions

diff --git a/ext/ruby2d/extconf.rb b/ext/ruby2d/extconf.rb
index 46f42df..023daaf 100644
--- a/ext/ruby2d/extconf.rb
+++ b/ext/ruby2d/extconf.rb
@@ -2,7 +2,25 @@ require 'mkmf'
 require_relative '../../lib/ruby2d/colorize'
 
 S2D_VERSION = '1.1.0'  # Simple 2D minimum version required
-$errors = []  # Array to capture errors
+$errors = []  # Holds errors
+
+# Set the OS platform
+case RUBY_PLATFORM
+when /darwin/
+  $platform = :macos
+when /linux/
+  $platform = :linux
+  if `cat /etc/os-release` =~ /raspbian/
+    $platform = :linux_rpi
+  end
+when /mingw/
+  $platform = :windows
+else
+  $platform = nil
+end
+
+
+# Helper functions #############################################################
 
 # Print installation errors
 def print_errors
@@ -12,15 +30,15 @@ def print_errors
 #{"======================================================================"}"
 end
 
+
 # Check that Simple 2D is installed and meets minimum version requirements
 def check_s2d
 
   # Simple 2D not installed
   if `which simple2d`.empty?
     $errors << "Ruby 2D uses a native library called Simple 2D, which was not found." <<
-    "To install, follow the instructions at #{"ruby2d.com/learn".bold}"
-    print_errors
-    exit
+               "To install, follow the instructions at #{"ruby2d.com".bold}"
+    print_errors; exit
 
   # Simple 2D installed, checking version
   else
@@ -28,26 +46,79 @@ def check_s2d
       $errors << "Simple 2D needs to be updated for this version of Ruby 2D." <<
                  "Run the following, then try reinstalling this gem:\n" <<
                  "  simple2d update".bold
-      print_errors
-      exit
+      print_errors; exit
     end
   end
 end
 
+
+# Add compiler and linker flags
+def add_flags(type, flags)
+  case type
+  when :c
+    $CFLAGS << " #{flags} "
+  when :ld
+    $LDFLAGS << " #{flags} "
+  end
+end
+
+
+# Check SDL libraries on Linux
+def check_sdl_linux
+  unless have_library('SDL2') && have_library('SDL2_image') && have_library('SDL2_mixer') && have_library('SDL2_ttf')
+
+    $errors << "Couldn't find packages needed by Ruby 2D."
+
+    # Fedora and CentOS
+    if system('which yum')
+      $errors << "Install the following packages using `yum` (or `dnf`) and try again:\n" <<
+      "  SDL2-devel SDL2_image-devel SDL2_mixer-devel SDL2_ttf-devel".bold
+
+    # Arch
+    elsif system('which pacman')
+      $errors << "Install the following packages using `pacman` and try again:\n" <<
+      "  sdl2 sdl2_image sdl2_mixer sdl2_ttf".bold
+
+    # openSUSE
+    elsif system('which zypper')
+      $errors << "Install the following packages using `zypper` and try again:\n" <<
+      "  libSDL2-devel libSDL2_image-devel libSDL2_mixer-devel libSDL2_ttf-devel".bold
+
+    # Ubuntu, Debian, and Mint
+    # `apt` must be last because openSUSE has it aliased to `zypper`
+    elsif system('which apt')
+      $errors << "Install the following packages using `apt` and try again:\n" <<
+      "  libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-ttf-dev".bold
+    end
+
+    $errors << "" << "See #{"ruby2d.com".bold} for additional help."
+    print_errors; exit
+  end
+end
+
+
+# Set Raspberry Pi flags
+def set_rpi_flags
+  if $platform == :linux_rpi
+    add_flags(:c, '-I/opt/vc/include')
+    add_flags(:ld, '-L/opt/vc/lib -lbrcmGLESv2')
+  end
+end
+
+
 # Use the Simple 2D, SDL, and other libraries installed by the user (not those bundled with the gem)
 def use_usr_libs
   check_s2d
 
   # Add flags
-  $CFLAGS << ' -std=c11 -I/usr/local/include'
-  if `cat /etc/os-release` =~ /raspbian/  # Raspberry Pi
-    $CFLAGS << ' -I/opt/vc/include'
-  end
-  $LDFLAGS << ' ' << `bash simple2d --libs`
-  $LDFLAGS.gsub!(/\n/, ' ')  # remove newlines in flags, they cause problems
+  set_rpi_flags
+  add_flags(:c, '-I/usr/local/include')
+  add_flags(:ld, `bash simple2d --libs`)
 end
 
 
+# Configure native extension ###################################################
+
 # Build Ruby 2D native extention using libraries installed by user
 # To use install flag: `gem install ruby2d -- libs`
 if ARGV.include? 'libs'
@@ -55,27 +126,36 @@ if ARGV.include? 'libs'
 
 # Use libraries provided by the gem (default)
 else
-  $CFLAGS << ' -std=c11 -I../../assets/include'
-  case RUBY_PLATFORM
+  add_flags(:c, '-std=c11')
 
-  # macOS
-  when /darwin/
-    # $LDFLAGS << " -L../../assets/macos/lib -lsimple2d -lSDL2 -lSDL2_image -lSDL2_mixer -lSDL2_ttf -ljpeg -lpng16 -ltiff -lwebp -lmpg123 -logg -lflac -lvorbis -lvorbisfile -lfreetype -Wl,-framework,Cocoa -Wl,-framework,ForceFeedback"
+  case $platform
 
+  when :macos
+    add_flags(:c, '-I../../assets/include')
     ldir = "#{Dir.pwd}/../../assets/macos/lib"
-    $LDFLAGS << " #{ldir}/libsimple2d.a #{ldir}/libSDL2.a #{ldir}/libSDL2_image.a #{ldir}/libSDL2_mixer.a #{ldir}/libSDL2_ttf.a \
-                  #{ldir}/libjpeg.a #{ldir}/libpng16.a #{ldir}/libtiff.a #{ldir}/libwebp.a \
-                  #{ldir}/libmpg123.a #{ldir}/libogg.a #{ldir}/libflac.a #{ldir}/libvorbis.a #{ldir}/libvorbisfile.a \
-                  #{ldir}/libfreetype.a -Wl,-framework,Cocoa -Wl,-framework,ForceFeedback"
-
-  # Linux
-  when /linux/
-    # TODO: Implement static compilation for Linux
-    use_usr_libs
 
-  # Windows / MinGW
-  when /mingw/
-    $LDFLAGS << " -L../../assets/mingw/lib -lsimple2d -lSDL2 -lSDL2_image -lSDL2_mixer -lSDL2_ttf -lmingw32 -lopengl32 -lglew32"
+    add_flags(:ld, "#{ldir}/libsimple2d.a")
+    add_flags(:ld, "#{ldir}/libSDL2.a #{ldir}/libSDL2_image.a #{ldir}/libSDL2_mixer.a #{ldir}/libSDL2_ttf.a")
+    add_flags(:ld, "#{ldir}/libjpeg.a #{ldir}/libpng16.a #{ldir}/libtiff.a #{ldir}/libwebp.a")
+    add_flags(:ld, "#{ldir}/libmpg123.a #{ldir}/libogg.a #{ldir}/libflac.a #{ldir}/libvorbis.a #{ldir}/libvorbisfile.a")
+    add_flags(:ld, "#{ldir}/libfreetype.a")
+    add_flags(:ld, "-Wl,-framework,Cocoa -Wl,-framework,ForceFeedback")
+
+  when :linux, :linux_rpi
+    check_sdl_linux
+    simple2d_dir = "#{Dir.pwd}/../../assets/linux/simple2d"
+
+    `(cd #{simple2d_dir} && make)`
+
+    set_rpi_flags
+    add_flags(:c, "-I#{simple2d_dir}/include")
+    add_flags(:ld, "#{simple2d_dir}/build/libsimple2d.a -lSDL2 -lSDL2_image -lSDL2_mixer -lSDL2_ttf -lm")
+    if $platform == :linux then add_flags(:ld, '-lGL') end
+
+  when :windows
+    add_flags(:c, '-I../../assets/include')
+    add_flags(:ld, '-L../../assets/mingw/lib -lsimple2d -lSDL2 -lSDL2_image -lSDL2_mixer -lSDL2_ttf')
+    add_flags(:ld, '-lmingw32 -lopengl32 -lglew32')
 
   # If can't detect the platform, use libraries installed by the user
   else
@@ -83,6 +163,7 @@ else
   end
 end
 
+$LDFLAGS.gsub!(/\n/, ' ')  # remove newlines in flags, they can cause problems
 
 # Create the Makefile
 create_makefile('ruby2d/ruby2d')