Add SDL to the travis script.

.travis.yml

@@ -8,19 +8,20 @@ compiler:
   - clang
   - gcc
 
-before_install:
+install:
     - if [ `uname` = "Linux" ]; then
          export DISPLAY=:99.0;
          sh -e /etc/init.d/xvfb start;
          sudo apt-get update;
-         sudo apt-get install -y libvorbis-dev libtheora-dev libwebp-dev libphysfs-dev libopusfile-dev libdumb1-dev libflac-dev libpulse-dev libgtk2.0-dev pandoc libcurl4-nss-dev libenet-dev pulseaudio libasound2-dev libopenal-dev;
+         sudo apt-get install -y libvorbis-dev libtheora-dev libwebp-dev libphysfs-dev libopusfile-dev libdumb1-dev libflac-dev libpulse-dev libgtk2.0-dev pandoc libcurl4-nss-dev libenet-dev pulseaudio libasound2-dev libopenal-dev libsdl2-dev;
       elif [ `uname` = "Darwin" ]; then
-         brew update && brew install opusfile libvorbis webp freetype flac physfs dumb theora enet;
+         brew update && brew install opusfile libvorbis webp freetype flac physfs dumb theora enet sdl2;
       fi
 
 env:
-  - WANT_SHADERS_GL=on
-  - WANT_SHADERS_GL=off
+  - WANT_SHADERS_GL=on SDL=on
+  - WANT_SHADERS_GL=on SDL=off
+  - WANT_SHADERS_GL=off SDL=off
 
 before_script:
   - mkdir build
@@ -29,7 +30,7 @@ before_script:
 script:
     - |
       if [ `uname` = "Linux" ]; then
-         cmake .. -DCMAKE_BUILD_TYPE=Debug -DWANT_SHADERS_GL=$WANT_SHADERS_GL -DWANT_CURL_EXAMPLE=on
+         cmake .. -DCMAKE_BUILD_TYPE=Debug -DWANT_SHADERS_GL=$WANT_SHADERS_GL -DWANT_SDL=$WANT_SDL -DWANT_CURL_EXAMPLE=on
          make
          . ../tests/grab_bitmap_suites.sh
          find ../tests -name '*.ini' | grep -v 'compressed' | xargs tests/test_driver | tee /tmp/test_out
@@ -40,7 +41,7 @@ script:
          pulseaudio -D
          ./install_test
       elif [ `uname` = "Darwin" ]; then
-         cmake .. -DWANT_SHADERS_GL=$WANT_SHADERS_GL -G Xcode
+         cmake .. -DWANT_SHADERS_GL=$WANT_SHADERS_GL -DWANT_SDL=$WANT_SDL -G Xcode
          xcodebuild
       fi