The-Homebrew-Cloud/Genesis-Plus-GX
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Genesis-Plus-GX/source/gx/main.c
ekeeke31 34a9015f0e Removed useless IOS code
2010-08-19 13:25:07 +00:00

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/****************************************************************************
* main.c
*
* Genesis Plus GX
*
* Softdev (2006)
* Eke-Eke (2007,2008,2009)
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
***************************************************************************/
#include "shared.h"
#include "font.h"
#include "gui.h"
#include "menu.h"
#include "aram.h"
#include "dvd.h"
#include "history.h"
#include "file_slot.h"
#include "file_fat.h"
#include "filesel.h"
#include <fat.h>
#ifdef HW_RVL
#include <wiiuse/wpad.h>
extern u32 __di_check_ahbprot(void);
#endif
u32 Shutdown = 0;
u32 ConfigRequested = 1;
#ifdef HW_RVL
/****************************************************************************
* Power Button callback
***************************************************************************/
static void Power_Off(void)
{
Shutdown = 1;
ConfigRequested = 1;
}
#endif
/***************************************************************************
* Genesis Plus Virtual Machine
*
***************************************************************************/
static void load_bios(void)
{
/* clear BIOS detection flag */
config.tmss &= ~2;
/* open BIOS file */
FILE *fp = fopen(OS_ROM, "rb");
if (fp == NULL) return;
/* read file */
fread(bios_rom, 1, 0x800, fp);
fclose(fp);
/* check ROM file */
if (!strncmp((char *)(bios_rom + 0x120),"GENESIS OS", 10))
{
/* valid BIOS detected */
config.tmss |= 2;
}
}
static void init_machine(void)
{
/* Allocate cart_rom here ( 10 MBytes ) */
cart.rom = memalign(32, MAXROMSIZE);
if (!cart.rom)
{
FONT_writeCenter("Failed to allocate ROM buffer... Rebooting",18,0,640,200,(GXColor)WHITE);
gxSetScreen();
sleep(2);
gx_audio_Shutdown();
gx_video_Shutdown();
#ifdef HW_RVL
DI_Close();
SYS_ResetSystem(SYS_RESTART,0,0);
#else
SYS_ResetSystem(SYS_HOTRESET,0,0);
#endif
}
/* BIOS support */
load_bios();
/* allocate global work bitmap */
memset (&bitmap, 0, sizeof (bitmap));
bitmap.width = 720;
bitmap.height = 576;
bitmap.depth = 16;
bitmap.granularity = 2;
bitmap.pitch = bitmap.width * bitmap.granularity;
bitmap.viewport.w = 256;
bitmap.viewport.h = 224;
bitmap.viewport.x = 0;
bitmap.viewport.y = 0;
bitmap.data = texturemem;
}
static void run_emulation(void)
{
/* main emulation loop */
while (1)
{
/* Main Menu request */
if (ConfigRequested)
{
/* stop video & audio */
gx_audio_Stop();
gx_video_Stop();
/* show menu */
menu_execute();
ConfigRequested = 0;
/* start video & audio */
gx_video_Start();
gx_audio_Start();
frameticker = 1;
}
/* automatic frame skipping */
if (frameticker > 1)
{
/* skip frame */
system_frame(1);
frameticker = 1;
}
else
{
/* render frame */
frameticker = 0;
system_frame(0);
/* update video */
gx_video_Update();
}
/* update audio */
gx_audio_Update();
/* check interlaced mode change */
if (bitmap.viewport.changed & 4)
{
/* in original 60hz modes, audio is synced with framerate */
if (!config.render && !vdp_pal && (config.tv_mode != 1))
{
u8 *temp = memalign(32,YM2612GetContextSize());
if (temp)
{
/* save YM2612 context */
memcpy(temp, YM2612GetContextPtr(), YM2612GetContextSize());
/* framerate has changed, reinitialize audio timings */
audio_init(48000, interlaced ? 59.94 : (1000000.0/16715.0));
sound_init();
/* restore YM2612 context */
YM2612Restore(temp);
free(temp);
}
}
/* clear flag */
bitmap.viewport.changed &= ~4;
}
/* wait for next frame */
while (frameticker < 1)
usleep(1);
}
}
/**************************************************
Load a new rom and performs some initialization
***************************************************/
void reloadrom (int size, char *name)
{
/* cartridge hot-swap support */
uint8 hotswap = 0;
if (cart.romsize)
{
hotswap = config.hot_swap;
}
/* Load ROM */
cart.romsize = size;
load_rom(name);
if (hotswap)
{
cart_hw_init();
cart_hw_reset();
}
else
{
/* initialize audio back-end */
/* 60hz video mode requires synchronization with Video Interrupt. */
/* Framerate is 59.94 fps in interlaced/progressive modes, ~59.825 fps in non-interlaced mode */
float framerate = vdp_pal ? 50.0 : ((config.tv_mode == 1) ? 60.0 : (config.render ? 59.94 : (1000000.0/16715.0)));
audio_init(48000, framerate);
/* System Power ON */
system_init ();
ClearGGCodes ();
system_reset ();
}
}
/**************************************************
Shutdown everything properly
***************************************************/
void shutdown(void)
{
config_save();
if (config.s_auto & 2)
{
slot_autosave(config.s_default,config.s_device);
}
system_shutdown();
audio_shutdown();
free(cart.rom);
gx_audio_Shutdown();
gx_video_Shutdown();
#ifdef HW_RVL
DI_Close();
#endif
}
/***************************************************************************
* M A I N
*
***************************************************************************/
u32 fat_enabled = 0;
u32 frameticker = 0;
int main (int argc, char *argv[])
{
#ifdef HW_RVL
/* if HW_AHBPROT flag is not set (DVD support), try to reload IOS 58 (USB2 support) */
if ((IOS_GetVersion() != 58) && (__di_check_ahbprot() != 1)) IOS_ReloadIOS(58);
/* initialize DVD device */
DI_Init();
#endif
/* initialize video engine */
gx_video_Init();
#ifdef HW_DOL
/* initialize DVD device */
DVD_Init ();
dvd_drive_detect();
#endif
/* initialize FAT devices */
if (fatInitDefault())
{
/* base directory */
char pathname[MAXPATHLEN];
sprintf (pathname, DEFAULT_PATH);
DIR_ITER *dir = diropen(pathname);
if (dir) dirclose(dir);
else mkdir(pathname,S_IRWXU);
/* default SRAM & Savestate files directory */
sprintf (pathname, "%s/saves",DEFAULT_PATH);
dir = diropen(pathname);
if (dir) dirclose(dir);
else mkdir(pathname,S_IRWXU);
/* default Snapshot files directory */
sprintf (pathname, "%s/snaps",DEFAULT_PATH);
dir = diropen(pathname);
if (dir) dirclose(dir);
else mkdir(pathname,S_IRWXU);
}
/* initialize input engine */
gx_input_Init();
/* initialize sound engine (need libfat) */
gx_audio_Init();
/* initialize genesis plus core */
legal();
config_default();
history_default();
init_machine();
/* run any injected rom */
if (cart.romsize)
{
int size = cart.romsize;
cart.romsize = 0;
ARAMFetch((char *)cart.rom, (void *)0x8000, size);
reloadrom(size,"INJECT.bin");
ConfigRequested = 0;
gx_video_Start();
gx_audio_Start();
frameticker = 1;
}
else if (config.autoload)
{
SILENT = 1;
if (FAT_Open(TYPE_RECENT))
{
int size = FAT_LoadFile(cart.rom,0);
if (size)
{
reloadrom(size,filelist[0].filename);
if (config.s_auto & 1)
slot_autoload(0,config.s_device);
if (config.s_auto & 2)
slot_autoload(config.s_default,config.s_device);
gx_video_Start();
gx_audio_Start();
frameticker = 1;
ConfigRequested = 0;
}
}
SILENT = 0;
}
#ifdef HW_RVL
/* Power button callback */
SYS_SetPowerCallback(Power_Off);
#endif
/* main emulation loop */
run_emulation();
return 0;
}
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