Xworld - Another World interpreter for Rockbox

Co-conspirators: Franklin Wei, Benjamin Brown

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This work is based on:
- Fabien Sanglard's "Fabother World" based on
- Piotr Padkowski's newRaw interpreter which was based on
- Gregory Montoir's reverse engineering of
- Eric Chahi's assembly code

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Progress:

* The plugin runs pretty nicely (with sound!) on most color targets
* Keymaps for color LCD targets are complete
* The manual entry is finished
* Grayscale/monochrome support is NOT PLANNED
  - the game looks horrible in grayscale! :p

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Notes:

* The original game strings were built-in to the executable, and
  were copyrighted and could not be used.
* This port ships with an alternate set of strings by default, but
  can load the "official" strings from a file at runtime.

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To be done (in descending order of importance):

* vertical stride compatibility                          <30% done>
* optimization                                           <10% done>

Change-Id: I3155b0d97c2ac470cb8a2040f40d4139ddcebfa5
Reviewed-on: http://gerrit.rockbox.org/1077
Reviewed-by: Michael Giacomelli <giac2000@hotmail.com>

apps/plugins/xworld/engine.h

@@ -0,0 +1,70 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2014 Franklin Wei, Benjamin Brown
+ * Copyright (C) 2004 Gregory Montoir
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#ifndef __ENGINE_H__
+#define __ENGINE_H__
+
+#include "intern.h"
+#include "vm.h"
+#include "mixer.h"
+#include "sfxplayer.h"
+#include "resource.h"
+#include "video.h"
+#include "sys.h"
+
+#define STRING_TABLE_FILE "xworld.strings" /* this is relative to dataDir */
+#define STRING_TABLE_VERSION 0x03
+
+#define XWORLD_FONT_FILE "xworld.font" /* relative to dataDir */
+#define XWORLD_FONT_VERSION 0x01
+
+struct System;
+
+#define MAX_SAVE_SLOTS 1
+#define SAVE_MAGIC 0x42424657
+struct Engine {
+    struct System *sys;
+    struct VirtualMachine vm;
+    struct Mixer mixer;
+    struct Resource res;
+    struct SfxPlayer player;
+    struct Video video;
+    const char *_dataDir, *_saveDir;
+    uint8_t _stateSlot;
+};
+
+void engine_create(struct Engine* e, struct System* stub, const char* dataDir, const char* saveDir);
+
+void engine_run(struct Engine*);
+void engine_init(struct Engine*);
+void engine_finish(struct Engine*);
+void engine_processInput(struct Engine*);
+
+bool engine_loadFontFile(struct Engine*);
+bool engine_loadStringTable(struct Engine*);
+
+void engine_makeGameStateName(struct Engine*, uint8_t slot, char *buf, int sz);
+void engine_saveGameState(struct Engine*, uint8_t slot, const char *desc);
+bool engine_loadGameState(struct Engine*, uint8_t slot);
+void engine_deleteGameState(struct Engine*, uint8_t slot);
+const char* engine_getDataDir(struct Engine*);
+#endif