rockbox/apps/plugins/rockboy/rockboy.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Gameboy emulator based on gnuboy
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "plugin.h"
#include "loader.h"
#include "rockmacros.h"

PLUGIN_HEADER

#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
extern char iedata[];
extern char iend[];
#endif

/* here is a global api struct pointer. while not strictly necessary,
   it's nice not to have to pass the api pointer in all function calls
   in the plugin */
struct plugin_api* rb;
int shut,cleanshut;
char *errormsg;
int gnuboy_main(char *rom);
void pcm_close(void);

void die(char *message, ...)
{
    shut=1;
    errormsg=message;
}

void *audio_bufferbase;
void *audio_bufferpointer;
unsigned int audio_buffer_free;

void *my_malloc(size_t size)
{
    void *alloc;

    if (size + 4 > audio_buffer_free)
        return 0;
    alloc = audio_bufferpointer;
    audio_bufferpointer += size + 4;
    audio_buffer_free -= size + 4;
    return alloc;
}

/* Using #define isn't enough with GCC 4.0.1 */

void* memcpy(void* dst, const void* src, size_t size)
{
    return rb->memcpy(dst, src, size);
}

void setmallocpos(void *pointer) 
{
    audio_bufferpointer = pointer;
    audio_buffer_free = audio_bufferpointer - audio_bufferbase;
}

/* this is the plugin entry point */
enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
{
    /* if you are using a global api pointer, don't forget to copy it!
       otherwise you will get lovely "I04: IllInstr" errors... :-) */
    rb = api;
    
	rb->lcd_setfont(0);

    if (!parameter) {
        rb->splash(HZ*3, true, "Play gameboy ROM file! (.gb/.gbc)");
        return PLUGIN_OK;
    }
    
    audio_bufferbase = audio_bufferpointer
        = rb->plugin_get_audio_buffer((int *)&audio_buffer_free);
#if MEM <= 8 && !defined(SIMULATOR)
    /* loaded as an overlay plugin, protect from overwriting ourselves */
    if ((unsigned)(plugin_start_addr - (unsigned char *)audio_bufferbase)
        < audio_buffer_free)
        audio_buffer_free = plugin_start_addr - (unsigned char *)audio_bufferbase;
#endif

#ifdef USE_IRAM
    memcpy(iramstart, iramcopy, iramend-iramstart);
    memset(iedata, 0, iend - iedata);
#endif
    shut=0;
    cleanshut=0;

    /* now go ahead and have fun! */
    /* rb->splash(HZ*2, true, "Rockboy v0.3"); */
    /* rb->lcd_clear_display(); */
    gnuboy_main(parameter);

    if(shut&&!cleanshut) {
        rb->splash(HZ*2, true, errormsg);
        return PLUGIN_ERROR;
    }
    pcm_close();
    rb->splash(HZ*2, true, "Shutting down.. byebye ^^");

    cleanup();


    return PLUGIN_OK;
}