Minor cleanup; expand docs.

README.md

@@ -4,6 +4,8 @@ crater
 **crater** is an emulator for the [Sega Game Gear][game gear], with an included
 [Z80][z80] assembler/disassembler, written in C.
 
+![Tails Adventure (1995)](/docs/tailsadventure.png?raw=true "Tails Adventure (1995)")
+
 [game gear]: https://en.wikipedia.org/wiki/Sega_Game_Gear
 [z80]: https://en.wikipedia.org/wiki/Zilog_Z80
 
@@ -82,6 +84,23 @@ the input file, with the extension replaced with `.gg` for `-a` and `.asm` for
 `-d`. By default, this will never overwrite the original filename; pass
 `--overwrite` (`-r`) to let crater do so.
 
+Status
+------
+
+The emulator is almost fully functional, lacking only audio support, a few
+uncommon CPU instructions, and some advanced graphics features. Most games are
+playable with only minor bugs. Future goals include save states and a more
+sophisticated debugging mode.
+
+The assembler is complete. Future goals include more documentation, macros, and
+additional directives.
+
+The disassembler works, but can't differentiate between code and data yet, so
+it's not very useful.
+
+The testing infrasture is limited. The assembler has decent coverage, other
+components minimal.
+
 Credits
 -------
 

docs/README

@@ -0,0 +1,4 @@
+More detailed documentation isn't available yet. All your questions are
+answered in the main README.
+
+At the moment, this directory contains supporting content for said README.

src/config.c

@@ -39,10 +39,11 @@ static void print_help(const char *arg1)
 "                      to show more detailed logs, including an emulator trace\n"
 "    -s, --scale <n>   scale the game screen by an integer factor\n"
 "                      (applies to windowed mode only; defaults to 4)\n"
-"    -a, --assemble <in> [<out>]     convert z80 assembly source code into a\n"
-"                                    binary file that can be run by crater\n"
-"    -d, --disassemble <in> [<out>]  convert a binary file into z80 assembly\n"
-"                                    source code\n"
+"    -a, --assemble <in> [<out>]\n"
+"                      convert z80 assembly source code into a binary file that\n"
+"                      can be run by crater\n"
+"    -d, --disassemble <in> [<out>]\n"
+"                      convert a binary file into z80 assembly source code\n"
 "    -r, --overwrite   allow crater to write assembler output to the same\n"
 "                      filename as the input\n",
     arg1);

src/emulator.c

@@ -42,7 +42,7 @@ static void setup_graphics(bool fullscreen, unsigned scale)
     if (fullscreen)
         flags = SDL_WINDOW_FULLSCREEN_DESKTOP;
     else
-        flags = SDL_WINDOW_BORDERLESS|SDL_WINDOW_RESIZABLE;
+        flags = SDL_WINDOW_RESIZABLE;
 
     SDL_CreateWindowAndRenderer(
         scale * GG_SCREEN_WIDTH, scale * GG_SCREEN_HEIGHT,

src/vdp.c

@@ -216,6 +216,8 @@ static void draw_background(VDP *vdp)
         bool     vflip    = tile & 0x0400;
         bool     hflip    = tile & 0x0200;
 
+        (void) priority;  // TODO
+
         uint8_t vshift = vflip ? (7 - src_row % 8) : (src_row % 8), hshift;
         uint8_t pixel, index;
         int16_t dst_col;
@@ -275,7 +277,7 @@ static void draw_sprites(VDP *vdp)
             pattern |= (vdp->v_counter - y) >> 3;
             vshift   = (vdp->v_counter - y) % 8;
         } else {
-            FATAL("TODO: sprite doubling")
+            // TODO: sprite doubling
         }
 
         uint8_t pixel, index;