ffplay: convert ffplay to use SDL2

Signed-off-by: Marton Balint <cus@passwd.hu>

configure

@@ -1969,6 +1969,7 @@ HAVE_LIST="
     perl
     pod2man
     sdl
+    sdl2
     section_data_rel_ro
     texi2html
     threads
@@ -2953,8 +2954,8 @@ ffmpeg_deps="avcodec avfilter avformat swresample"
 ffmpeg_select="aformat_filter anull_filter atrim_filter format_filter
                null_filter
                setpts_filter trim_filter"
-ffplay_deps="avcodec avformat swscale swresample sdl"
-ffplay_libs='$sdl_libs'
+ffplay_deps="avcodec avformat swscale swresample sdl2"
+ffplay_libs='$sdl2_libs'
 ffplay_select="rdft crop_filter transpose_filter hflip_filter vflip_filter rotate_filter"
 ffprobe_deps="avcodec avformat"
 ffserver_deps="avformat fork sarestart"
@@ -5579,7 +5580,24 @@ if enabled libdc1394; then
         enable libdc1394_1; } ||
     die "ERROR: No version of libdc1394 found "
 fi
-if ! disabled sdl; then
+
+SDL2_CONFIG="${cross_prefix}sdl2-config"
+if check_pkg_config sdl2; then
+    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x020001" $sdl2_cflags &&
+    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) < 0x020100" $sdl2_cflags &&
+    enable sdl2
+else
+  if "${SDL2_CONFIG}" --version > /dev/null 2>&1; then
+    sdl2_cflags=$("${SDL2_CONFIG}" --cflags)
+    sdl2_libs=$("${SDL2_CONFIG}" --libs)
+    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x020001" $sdl2_cflags &&
+    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) < 0x020100" $sdl2_cflags &&
+    enable sdl2
+  fi
+fi
+enabled sdl2 && add_cflags $sdl2_cflags && add_extralibs $sdl2_libs
+
+if ! disabled sdl and ! enabled sdl2; then
     SDL_CONFIG="${cross_prefix}sdl-config"
     if check_pkg_config sdl SDL_events.h SDL_PollEvent; then
         check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x010201" $sdl_cflags &&
@@ -6164,6 +6182,7 @@ echo "network support           ${network-no}"
 echo "threading support         ${thread_type-no}"
 echo "safe bitstream reader     ${safe_bitstream_reader-no}"
 echo "SDL support               ${sdl-no}"
+echo "SDL2 support              ${sdl2-no}"
 echo "opencl enabled            ${opencl-no}"
 echo "texi2html enabled         ${texi2html-no}"
 echo "perl enabled              ${perl-no}"
@@ -6312,7 +6331,7 @@ HOSTLD_O=$HOSTLD_O
 TARGET_EXEC=$target_exec $target_exec_args
 TARGET_PATH=$target_path
 TARGET_SAMPLES=${target_samples:-\$(SAMPLES)}
-CFLAGS-ffplay=$sdl_cflags
+CFLAGS-ffplay=$sdl2_cflags
 ZLIB=$($ldflags_filter -lz)
 LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
 EXTRALIBS=$extralibs