build: always build the rototiller bin

Now that there's the mem_fb backend, there's no need to disable
producing a rototiller binary in lieu of libdrm and libsdl2.

This commit also rejiggers some of the DEFAULT_VIDEO junk in
main.c to ensure it falls back on "mem" should there be no drm or
sdl2.

For now I'm going to leave the AM_CONDITIONAL junk surrounding
enabling rototiller in configure.ac, the define can just be
ignored for now.

1 files changed, 12 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index c22eb3c..38a99d0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,11 +27,22 @@
  * another page so we can begin rendering another frame before vsync.  With
  * just two pages we end up twiddling thumbs until the vsync arrives.
  */
+
+#ifndef DEFAULT_VIDEO
 #ifdef HAVE_SDL
 #define DEFAULT_VIDEO	"sdl"
-#else
+#endif
+#endif
+
+#ifndef DEFAULT_VIDEO
+#ifdef  HAVE_DRM
 #define DEFAULT_VIDEO	"drm"
 #endif
+#endif
+
+#ifndef DEFAULT_VIDEO
+#define DEFAULT_VIDEO	"mem"
+#endif
 
 extern til_fb_ops_t	drm_fb_ops;
 extern til_fb_ops_t	mem_fb_ops;