Major rewrite. Abstracting graphics code completely and allowing new extensions via a consistent drawing interface

src/gfx.h

@@ -0,0 +1,30 @@
+#ifndef GFX_H
+#define GFX_H
+
+#include "engine.h"
+
+/* These can be defined by an implemenation if special codes are used
+ * to represent some keys. e.g. KEY_LEFT in ncurses */
+#define GFX_RIGHT_EXTRA
+#define GFX_LEFT_EXTRA
+#define GFX_DOWN_EXTRA
+#define GFX_UP_EXTRA
+
+struct gfx_state;
+
+/* Initialization of a graphics context */
+struct gfx_state* gfx_init(struct gamestate *);
+
+/* Drawing of a game_state onto a graphics context */
+void gfx_draw(struct gfx_state *, struct gamestate *);
+
+/* Blocking get character. Should not be buffered for best results */
+int gfx_getch(struct gfx_state *);
+
+/* Destruction of a graphics context */
+void gfx_destroy(struct gfx_state *);
+
+/* Sleep for a specifed millisecond period */
+void gfx_sleep(int ms);
+
+#endif