msdos.cpp

SFC游戏模拟器 snes9x 1.43 的原代码

/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 
  (c) Copyright 1996 - 2002 Gary Henderson ([e-mail]) and
                            Jerremy Koot ([e-mail])

  (c) Copyright 2001 - 2004 John Weidman ([e-mail])

  (c) Copyright 2002 - 2004 Brad Jorsch ([e-mail]),
                            funkyass ([e-mail]),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley ([e-mail]),
                            Matthew Kendora,
                            Nach ([e-mail]),
                            Peter Bortas ([e-mail]) and
                            zones ([e-mail])

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight ([e-mail]),
                            _Demo_ ([e-mail]), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar ([e-mail]), _Demo_, Gary Henderson,
                            John Weidman, neviksti ([e-mail]),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare ([e-mail]

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault ([e-mail]) and
                            Kris Bleakley
  Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002 Matthew Kendora with research by
                     zsKnight, John Weidman, and Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003 Brad Jorsch with research by
                     Andreas Naive and John Weidman
 
  S-RTC C emulator code
  (c) Copyright 2001 John Weidman
  
  ST010 C++ emulator code
  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora

  Super FX x86 assembler emulator code 
  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 

  Super FX C emulator code 
  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman


  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004 Marcus Comstedt ([e-mail]) 

 
  Specific ports contains the works of other authors. See headers in
  individual files.
 
  Snes9x homepage: http://www.snes9x.com
 
  Permission to use, copy, modify and distribute Snes9x in both binary and
  source form, for non-commercial purposes, is hereby granted without fee,
  providing that this license information and copyright notice appear with
  all copies and any derived work.
 
  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software.
 
  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes
  charging money for Snes9x or software derived from Snes9x.
 
  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.
 
  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
*******************************************************************************/
#include <allegro.h>
#undef TRUE
#undef FALSE

#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include "swinder.h"
#include "sb.h"

#include "scancode.h"

#include <dpmi.h>
#include <go32.h>

#include "snes9x.h"
#include "memmap.h"
#include "debug.h"
#include "ppu.h"
#include "snapshot.h"
#include "gfx.h"
#include "display.h"
#include "apu.h"
#include "soundux.h"

#ifdef NETPLAY_SUPPORT
#include "netplay.h"
#endif

#define COUNT(a) (sizeof(a) / sizeof(a[0]))

#define sti() __asm__ __volatile__ ("sti": : :"memory")
#define cli() __asm__ __volatile__ ("cli": : :"memory")

static int screen_pitch = 0;
uint32 screen_width = 0;
uint32 screen_height = 0;
static int mode = -1;
static bool8 planar = FALSE;
static bool8 in_text_mode = TRUE;
static bool8 stretch = FALSE;
BITMAP *off_screen;
static BITMAP *sub_screen;
static uint8 *Delta = NULL;
static int num_sidewinders = 0;
static bool8 grip_initialised = FALSE;
extern int NumControllers;
static bool8 mouse_installed = FALSE;
static int prev_mouse_x = 0;
static int prev_mouse_y = 0;
static uint32 superscope_turbo = 0;
static uint32 superscope_pause = 0;
static int mouse_offset_x = 0;
static int mouse_offset_y = 0;
static double mouse_scale_h = 1.0;
static double mouse_scale_v = 1.0;
static bool8 wait_for_vsync = FALSE;
static bool8 interpolate = FALSE;

uint32 last_rendered_width = 0;
uint32 last_rendered_height = 0;

#ifdef GRIP_SUPPORT
#include "grip.h"
void InitGrip ();
void ReadGrip ();
#endif

#ifdef SIDEWINDER_SUPPORT
void InitSidewinders ();
int ReadSidewinders ();
extern bool8 alternate_sidewinder_mapping;
#endif

extern uint32 joypads [5];
extern BITMAP *screen;

void SaveScreenshot ();

#ifdef JOYSTICK_SUPPORT
extern bool8 joystick_has_four_buttons;
extern bool8 joystick_has_six_buttons;
extern bool8 joystick_has_eight_buttons;
#endif

#define ATTRCON_ADDR	0x3c0
#define MISC_ADDR	0x3c2
#define VGAENABLE_ADDR	0x3c3
#define SEQ_ADDR	0x3c4
#define GRACON_ADDR	0x3ce
#define CRTC_ADDR	0x3d4
#define STATUS_ADDR	0x3da

typedef struct
{
    unsigned port;
    unsigned char index;
    unsigned char value;
} Register;

typedef Register *RegisterPtr;
void outRegArray (Register *r, int n);

Register scr256x256[] =
{
     { 0x3c2, 0x00, 0xe3},{ 0x3d4, 0x00, 0x5f},{ 0x3d4, 0x01, 0x3f},
     { 0x3d4, 0x02, 0x40},{ 0x3d4, 0x03, 0x82},{ 0x3d4, 0x04, 0x4A},
     { 0x3d4, 0x05, 0x9A},{ 0x3d4, 0x06, 0x23},{ 0x3d4, 0x07, 0xb2},
     { 0x3d4, 0x08, 0x00},{ 0x3d4, 0x09, 0x61},{ 0x3d4, 0x10, 0x0a},
     { 0x3d4, 0x11, 0xac},{ 0x3d4, 0x12, 0xff},{ 0x3d4, 0x13, 0x20},
     { 0x3d4, 0x14, 0x40},{ 0x3d4, 0x15, 0x07},{ 0x3d4, 0x16, 0x1a},
     { 0x3d4, 0x17, 0xa3},{ 0x3c4, 0x01, 0x01},{ 0x3c4, 0x04, 0x0e},
     { 0x3ce, 0x05, 0x40},{ 0x3ce, 0x06, 0x05},{ 0x3c0, 0x10, 0x41},
     { 0x3c0, 0x13, 0x00}
};

typedef struct
{
    int width;
    int height;
    int mode;
} Mode;

static Mode modes [] = {
    {320, 240, GFX_MODEX},	    // 0
    {320, 200, GFX_VGA},	    // 1
    {256, 256, GFX_VGA},	    // 2
    {640, 480, GFX_AUTODETECT},	    // 3
    {640, 480, GFX_VESA1},	    // 4
    {640, 480, GFX_VESA2B},	    // 5
    {640, 480, GFX_VESA2L},	    // 6
    {640, 400, GFX_XTENDED},	    // 7
    {800, 600, GFX_AUTODETECT},	    // 8

    {320, 240, GFX_AUTODETECT},	    // 9
    {640, 480, GFX_AUTODETECT},	    // 10
    {512, 384, GFX_AUTODETECT},	    // 11
    {800, 600, GFX_AUTODETECT}	    // 12
};

void S9xGraphicsMode ()
{
    if (in_text_mode)
    {
	if (mode < 0)
	{
	    if (Settings.SixteenBit)
	    {
		if (Settings.SupportHiRes || interpolate)
		    mode = 10;
		else
		    mode = 9;
	    }
	    else
	    {
		if (Settings.SupportHiRes)
		    mode = 3;
		else
		    mode = 2;
	    }
	}

	int ret;
	do
	{
	    screen_width = modes [mode].width;
	    screen_height = modes [mode].height;

	    set_color_depth (Settings.SixteenBit ? 16: 8);
	    if (modes [mode].mode == GFX_VGA)
		ret = set_gfx_mode (modes [mode].mode, 320, 200, 0, 0);
	    else
		ret = set_gfx_mode (modes [mode].mode, modes [mode].width,
				    modes [mode].height, 0, 0);
	} while (ret < 0 && ++mode < COUNT(modes));

	planar = modes [mode].mode == GFX_MODEX;
	    
	if (ret < 0)
	{
	    fprintf (stderr, "Unable to switch to requested screen mode/resolution:\n%s\n",
		    allegro_error);
	    S9xExit ();
	}

	if (modes [mode].mode == GFX_VGA && screen_width == 256)
	{
	    outRegArray (scr256x256, sizeof (scr256x256) / sizeof (Register));
	    screen->w = screen->cr = 256;
	    screen->h = screen->cb = 256;
	    for (int i = 1; i < 256; i++)
		screen->line[i] = screen->line[i - 1] + 256;
	}

	clear_to_color (screen, 0);
    
	if (install_keyboard ())
	{
	    set_gfx_mode (GFX_TEXT, 0, 0, 0, 0);
	    fprintf (stdout, "Keyboard initialisation failed.\n");
	    S9xExit ();
	}
	if (!install_mouse ())
	{
	    mouse_installed = TRUE;
	    set_mouse_range (0, 0, screen_width, screen_height);
	    position_mouse (screen_width / 2, screen_height / 2);
	    prev_mouse_x = mouse_x;
	    prev_mouse_y = mouse_y;
	}
	else
	    mouse_installed = FALSE;
	in_text_mode = FALSE;
    }
}

void S9xTextMode ()
{
    if (!in_text_mode)
    {
	set_color_depth (8);
	remove_keyboard ();
	remove_mouse ();
	set_gfx_mode (GFX_TEXT, 0, 0, 0, 0);
	in_text_mode = TRUE;
    }
}

void S9xInitDisplay (int argc, char **argv)
{
    if (allegro_init () < 0)
    {
	fprintf (stdout, "Unable to initialise Allegro library.\n");
	S9xExit ();
    }

    extern int i_love_bill;

    if (mode >= 9 || (mode < 0 && Settings.SixteenBit))
    {
	set_color_depth (16);
	Settings.Transparency = TRUE;
	Settings.SixteenBit = TRUE;
    }
    else
    {
	set_color_depth (8);
	Settings.Transparency = FALSE;
	Settings.SixteenBit = FALSE;
    }
    
    /*i_love_bill = FALSE;*/

    off_screen = create_bitmap (IMAGE_WIDTH + 2, IMAGE_HEIGHT);

    GFX.Screen = (uint8 *) off_screen->dat;
    if (!GFX.Screen)
    {
	fprintf (stdout, "Cannot allocate screen buffer.\n");
	S9xExit ();
    }
    GFX.Pitch = off_screen->w;
    if (Settings.SixteenBit)
    {
	GFX.Pitch *= 2;
	sub_screen = create_bitmap ((IMAGE_WIDTH + 2), IMAGE_HEIGHT);
	Delta = new uint8 [(IMAGE_WIDTH + 2) * IMAGE_HEIGHT * 2];
	if (!sub_screen || !Delta)
	{
	    fprintf (stdout, "Cannot allocate screen buffer.\n");
	    S9xExit ();
	}
	GFX.SubScreen = (uint8 *) sub_screen->dat;
	GFX.ZBuffer = (uint8 *) malloc (off_screen->w * IMAGE_HEIGHT);
	GFX.SubZBuffer = (uint8 *) malloc (off_screen->w * IMAGE_HEIGHT);
    }
    else
    {
	GFX.SubScreen = GFX.Screen;
	GFX.ZBuffer = (uint8 *) malloc (off_screen->w * IMAGE_HEIGHT);
	GFX.SubZBuffer = NULL;
	sub_screen = NULL;
	Delta = NULL;
    }
    screen_pitch = off_screen->w;
}

void S9xDeinitDisplay ()
{
    S9xTextMode ();
#ifdef GRIP_SUPPORT
    if (grip_initialised)
    {
	GrShutdown ();
	GrUnlink ();
    }
#endif
    destroy_bitmap (off_screen);
    if (sub_screen)
	destroy_bitmap (sub_screen);
    
    delete Delta;
    if (GFX.ZBuffer)
	free ((char *) GFX.ZBuffer);
    if (GFX.SubZBuffer)
	free ((char *) GFX.SubZBuffer);
    GFX.ZBuffer = NULL;
    GFX.SubZBuffer = NULL;
}

void S9xInitInputDevices ()
{
    if (Settings.JoystickEnabled)
    {
#ifdef GRIP_SUPPORT
	InitGrip ();
	if (grip_initialised)
	    num_sidewinders = 0;
	else
#endif

#ifdef SIDEWINDER_SUPPORT
	{
#ifdef GRIP_SUPPORT
	    usleep (20000);
#endif
	    InitSidewinders ();
	}
#else
	{ /* empty */ }
#endif

#ifdef JOYSTICK_SUPPORT
	if (joystick_has_four_buttons)
	    joy_type = JOY_TYPE_4BUTTON;
	else
	if (joystick_has_six_buttons)
	    joy_type = JOY_TYPE_6BUTTON;
	else
	if (joystick_has_eight_buttons)
	    joy_type = JOY_TYPE_8BUTTON;
	else
	    joy_type = JOY_TYPE_2PADS;
	if (num_sidewinders == 0 && !grip_initialised)
	    initialise_joystick ();
#endif
    }
}

#ifdef JOYSTICK_SUPPORT
void InitJoysticks ()
{
}

static int old_joy_left = 0;
static int old_joy_right = 0;
static int old_joy_up = 0;
static int old_joy_down = 0;
static int old_joy_b1 = 0;
static int old_joy_b2 = 0;
static int old_joy_b3 = 0;
static int old_joy_b4 = 0;
static int old_joy_b5 = 0;
static int old_joy_b6 = 0;
static int old_joy_b7 = 0;
static int old_joy_b8 = 0;
static int old_joy2_left = 0;
static int old_joy2_right = 0;
static int old_joy2_up = 0;
static int old_joy2_down = 0;
static int old_joy2_b1 = 0;
static int old_joy2_b2 = 0;

void ReadJoysticks ()
{
    if (num_sidewinders == 0 && !grip_initialised)
    {
	poll_joystick ();
	if (!joystick_has_four_buttons && !joystick_has_six_buttons &&
	    !joystick_has_eight_buttons)
	{
	    if (joy_b1 ^ old_joy_b1)
	    {
		if (joy_b1)
		    joypads [0] |= SNES_A_MASK;
		else
		    joypads [0] &= ~SNES_A_MASK;
	    }
	    if (joy_b2 ^ old_joy_b2)
	    {
		if (joy_b2)
		    joypads [0] |= SNES_B_MASK;
		else
		    joypads [0] &= ~SNES_B_MASK;
	    }
	}
	else
	{
	    if (joy_b1 ^ old_joy_b1)
	    {
		if (joy_b1)
		    joypads [0] |= SNES_Y_MASK;
		else
		    joypads [0] &= ~SNES_Y_MASK;
	    }
	    if (joy_b2 ^ old_joy_b2)
	    {
		if (joy_b2)
		    joypads [0] |= SNES_X_MASK;
		else
		    joypads [0] &= ~SNES_X_MASK;
	    }
	}
	if (joy_b3 ^ old_joy_b3)
	{
	    if (joy_b3)
		joypads [0] |= SNES_B_MASK;
	    else
		joypads [0] &= ~SNES_B_MASK;
	}
	if (joy_b4 ^ old_joy_b4)
	{
	    if (joy_b4)
		joypads [0] |= SNES_A_MASK;
	    else
		joypads [0] &= ~SNES_A_MASK;
	}
	if (joy_b5 ^ old_joy_b5)
	{
	    if (joy_b5)
		joypads [0] |= SNES_TL_MASK;
	    else
		joypads [0] &= ~SNES_TL_MASK;
	}
	if (joy_b6 ^ old_joy_b6)
	{
	    if (joy_b6)
		joypads [0] |= SNES_TR_MASK;
	    else
		joypads [0] &= ~SNES_TR_MASK;
	}
	if (joy_b7 ^ old_joy_b7)
	{
	    if (joy_b7)
		joypads [0] |= SNES_SELECT_MASK;
	    else
		joypads [0] &= ~SNES_SELECT_MASK;
	}
	if (joy_b8 ^ old_joy_b8)
	{
	    if (joy_b8)
		joypads [0] |= SNES_START_MASK;
	    else
		joypads [0] &= ~SNES_START_MASK;
	}
	if (joy_left ^ old_joy_left)
	{
	    if (joy_left)
		joypads [0] |= SNES_LEFT_MASK;
	    else
		joypads [0] &= ~SNES_LEFT_MASK;
	}
	if (joy_right ^ old_joy_right)
	{
	    if (joy_right)
		joypads [0] |= SNES_RIGHT_MASK;
	    else
		joypads [0] &= ~SNES_RIGHT_MASK;
	}
	if (joy_up ^ old_joy_up)
	{
	    if (joy_up)
		joypads [0] |= SNES_UP_MASK;
	    else
		joypads [0] &= ~SNES_UP_MASK;
	}
	if (joy_down ^ old_joy_down)
	{
	    if (joy_down)
		joypads [0] |= SNES_DOWN_MASK;
	    else
		joypads [0] &= ~SNES_DOWN_MASK;
	}

	if (!joystick_has_four_buttons && !joystick_has_six_buttons &&
	    !joystick_has_eight_buttons)
	{
	    if (joy2_b1 ^ old_joy2_b1)
	    {
		if (joy2_b1)
		    joypads [1] |= SNES_A_MASK;
		else
		    joypads [1] &= ~SNES_A_MASK;
	    }
	    if (joy2_b2 ^ old_joy2_b2)
	    {
		if (joy2_b2)
		    joypads [1] |= SNES_B_MASK;
		else
		    joypads [1] &= ~SNES_B_MASK;
	    }
	    if (joy2_left ^ old_joy2_left)
	    {
		if (joy2_left)
		    joypads [1] |= SNES_LEFT_MASK;
		else
		    joypads [1] &= ~SNES_LEFT_MASK;
	    }
	    if (joy2_right ^ old_joy2_right)
	    {
		if (joy2_right)
		    joypads [1] |= SNES_RIGHT_MASK;
		else