Xworld - Another World interpreter for Rockbox

Co-conspirators: Franklin Wei, Benjamin Brown

--------------------------------------------------------------------
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

--------------------------------------------------------------------
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

--------------------------------------------------------------------
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.

--------------------------------------------------------------------
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>

1 files changed, 69 insertions, 0 deletions

diff --git a/apps/plugins/xworld/mixer.h b/apps/plugins/xworld/mixer.h
new file mode 100644
index 0000000000..9447bcfb81
--- /dev/null
+++ b/apps/plugins/xworld/mixer.h
@@ -0,0 +1,69 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 __MIXER_H__
+#define __MIXER_H__
+
+#include "intern.h"
+
+struct MixerChunk {
+    const uint8_t *data;
+    uint16_t len;
+    uint16_t loopPos;
+    uint16_t loopLen;
+};
+
+struct MixerChannel {
+    uint8_t active;
+    uint8_t volume;
+    struct MixerChunk chunk;
+    uint32_t chunkPos;
+    uint32_t chunkInc;
+};
+
+struct Serializer;
+struct System;
+
+#define AUDIO_NUM_CHANNELS 4
+
+struct Mixer {
+    void *_mutex;
+    struct System *sys;
+
+    /* Since the virtual machine and SDL are running simultaneously in two different threads */
+    /* any read or write to an elements of the sound channels MUST be synchronized with a */
+    /* mutex. */
+    struct MixerChannel _channels[AUDIO_NUM_CHANNELS];
+};
+
+void mixer_create(struct Mixer*, struct System *stub);
+void mixer_init(struct Mixer*);
+void mixer_free(struct Mixer*);
+
+void mixer_playChannel(struct Mixer*, uint8_t channel, const struct MixerChunk *mc, uint16_t freq, uint8_t volume);
+void mixer_stopChannel(struct Mixer*, uint8_t channel);
+void mixer_setChannelVolume(struct Mixer*, uint8_t channel, uint8_t volume);
+void mixer_stopAll(struct Mixer*);
+
+void mixer_saveOrLoad(struct Mixer*, struct Serializer *ser);
+
+#endif