Ticket #8209: loom-drafts.diff

scummvm/scumm/debugger.cpp

@@ -91 +91 @@
                 DCmd_Register("scripts", &ScummDebugger::Cmd_PrintScript);
                 DCmd_Register("importres", &ScummDebugger::Cmd_ImportRes);
 
+                DCmd_Register("drafts", &ScummDebugger::Cmd_PrintDraft);
+
                 DCmd_Register("loadgame", &ScummDebugger::Cmd_LoadGame);
                 DCmd_Register("savegame", &ScummDebugger::Cmd_SaveGame);
 
@@ -699 +701 @@
                                                                 coords.ur.x, coords.ur.y, coords.lr.x, coords.lr.y,
                                                                 flags, mask, scale);
 }
+
+bool ScummDebugger::Cmd_PrintDraft(int argc, const char **argv) {
+        char *names[] = {
+                "Opening",      "Straw to Gold", "Dyeing",
+                "Night Vision", "Twisting",      "Sleep",
+                "Emptying",     "Invisibility",  "Terror",
+                "Sharpening",   "Reflection",    "Healing",
+                "Silence",      "Shaping",       "Unmaking",
+                "Transcendence"
+        };
+        int odds[] = {
+                15162, 15676, 16190,    64, 16961, 17475, 17989, 18503,
+                   73, 19274,    76,    77, 20302, 20816, 21330,    84
+        };
+                
+        char *notes = "cdefgabC";
+        int i, base, draft;
+
+        if (_s->_gameId != GID_LOOM && _s->_gameId != GID_LOOM256) {
+                Debug_Printf("Command only works with Loom/LoomCD\n");
+                return true;
+        }
+
+        // There are 16 drafts, stored from variable 50 or 100 and upwards.
+        // Each draft occupies two variables. Even-numbered variables contain
+        // the notes for each draft, and a number of flags:
+        //
+        // +---+---+---+---+-----+-----+-----+-----+
+        // | A | B | C | D | 444 | 333 | 222 | 111 |
+        // +---+---+---+---+-----+-----+-----+-----+
+        //
+        // A   Unknown
+        // B   The player has used the draft successfully at least once
+        // C   The player has knowledge of the draft
+        // D   Unknown
+        // 444 The fourth note
+        // 333 The third note
+        // 222 The second note
+        // 111 The first note
+        //
+        // I don't yet know what the odd-numbered variables are used for.
+        // Possibly they store information on where and/or how the draft can
+        // be used. They appear to remain constant throughout the game.
+
+        base = (_s->_gameId == GID_LOOM) ? 50 : 100;
+
+        // During the testing of EGA Loom we had some trouble with the drafts
+        // data structure being overwritten. I don't expect this command is
+        // particularly useful any more, but it will attempt to repair the
+        // (probably) static part of it.
+
+        if (argc == 2 && strcmp(argv[1], "fix") == 0) {
+                for (i = 0; i < 16; i++) {
+                        _s->_vars[base + 2 * i + 1] = odds[i];
+                }
+                Debug_Printf(
+                        "An attempt has been made to repair\n"
+                        "the internal drafts data structure.\n"
+                        "Continue on your own risk.\n");
+                return true;
+        }
+
+        // More useful, list the drafts.
+
+        for (i = 0; i < 16; i++) {
+                draft = _s->_vars[base + i * 2];
+                Debug_Printf("%d %-13s %c%c%c%c %c%c %5d %c\n",
+                        base + 2 * i,
+                        names[i],
+                        notes[draft & 0x0007],
+                        notes[(draft & 0x0038) >> 3],
+                        notes[(draft & 0x01c0) >> 6],
+                        notes[(draft & 0x0e00) >> 9],
+                        (draft & 0x2000) ? 'K' : ' ',
+                        (draft & 0x4000) ? 'U' : ' ',
+                        _s->_vars[base + 2 * i + 1],
+                        (_s->_vars[base + 2 * i + 1] != odds[i]) ? '!' : ' ');
+        }
+
+        return true;
+}

scummvm/scumm/debugger.h

@@ -83 +83 @@
         bool Cmd_Script(int argc, const char **argv);
         bool Cmd_PrintScript(int argc, const char **argv);
         bool Cmd_ImportRes(int argc, const char **argv);
-        
+
+        bool Cmd_PrintDraft(int argc, const char **argv);
+
         bool Cmd_DebugLevel(int argc, const char **argv);
         bool Cmd_Help(int argc, const char **argv);