2xsai.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.
*******************************************************************************/

#ifdef __DJGPP
#include <allegro.h>
#endif

#include "snes9x.h"
#include "port.h"
#include "gfx.h"

#if (defined(USE_X86_ASM) && (defined (__i386__) || defined (__i486__) || \
               defined (__i586__) || defined (__WIN32__) || defined (__DJGPP)))
#  ifndef MMX
#    define MMX
#  endif
#endif

extern "C"
{

#ifdef MMX
    void _2xSaILine (uint8 *srcPtr, uint8 *deltaPtr, uint32 srcPitch,
		     uint32 width, uint8 *dstPtr, uint32 dstPitch);
    void _2xSaISuperEagleLine (uint8 *srcPtr, uint8 *deltaPtr,
			       uint32 srcPitch, uint32 width,
			       uint8 *dstPtr, uint32 dstPitch);
    void _2xSaISuper2xSaILine (uint8 *srcPtr, uint8 *deltaPtr,
			       uint32 srcPitch, uint32 width,
			       uint8 *dstPtr, uint32 dstPitch);
    void Init_2xSaIMMX (uint32 BitFormat);
    void BilinearMMX (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
		      uint16 * dx, uint16 * dy, uint8 *dP);
    void BilinearMMXGrid0 (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
			   uint16 * dx, uint16 * dy, uint8 *dP);
    void BilinearMMXGrid1 (uint16 * A, uint16 * B, uint16 * C, uint16 * D,
			   uint16 * dx, uint16 * dy, uint8 *dP);
    void EndMMX ();

#endif
} 

bool8 cpu_mmx = 1;

static uint32 colorMask = 0xF7DEF7DE;
static uint32 lowPixelMask = 0x08210821;
static uint32 qcolorMask = 0xE79CE79C;
static uint32 qlowpixelMask = 0x18631863;
static uint32 redblueMask = 0xF81F;
static uint32 greenMask = 0x7E0;

int Init_2xSaI (uint32 BitFormat)
{
    if (BitFormat == 565)
    {
	colorMask = 0xF7DEF7DE;
	lowPixelMask = 0x08210821;
	qcolorMask = 0xE79CE79C;
	qlowpixelMask = 0x18631863;
	redblueMask = 0xF81F;
	greenMask = 0x7E0;
    }
    else if (BitFormat == 555)
    {
	colorMask = 0x7BDE7BDE;
	lowPixelMask = 0x04210421;
	qcolorMask = 0x739C739C;
	qlowpixelMask = 0x0C630C63;
	redblueMask = 0x7C1F;
	greenMask = 0x3E0;
    }
    else
    {
	return 0;
    }

#ifdef MMX
    Init_2xSaIMMX (BitFormat);
#endif

    return 1;
}

static inline int GetResult1 (uint32 A, uint32 B, uint32 C, uint32 D,
			      uint32 /* E */)
{
    int x = 0;
    int y = 0;
    int r = 0;

    if (A == C)
	x += 1;
    else if (B == C)
	y += 1;
    if (A == D)
	x += 1;
    else if (B == D)
	y += 1;
    if (x <= 1)
	r += 1;
    if (y <= 1)
	r -= 1;
    return r;
}

static inline int GetResult2 (uint32 A, uint32 B, uint32 C, uint32 D,
			      uint32 /* E */)
{
    int x = 0;
    int y = 0;
    int r = 0;

    if (A == C)
	x += 1;
    else if (B == C)
	y += 1;
    if (A == D)
	x += 1;
    else if (B == D)
	y += 1;
    if (x <= 1)
	r -= 1;
    if (y <= 1)
	r += 1;
    return r;
}

static inline int GetResult (uint32 A, uint32 B, uint32 C, uint32 D)
{
    int x = 0;
    int y = 0;
    int r = 0;

    if (A == C)
	x += 1;
    else if (B == C)
	y += 1;
    if (A == D)
	x += 1;
    else if (B == D)
	y += 1;
    if (x <= 1)
	r += 1;
    if (y <= 1)
	r -= 1;
    return r;
}

static inline uint32 INTERPOLATE (uint32 A, uint32 B)
{
    if (A != B)
    {
	return (((A & colorMask) >> 1) + ((B & colorMask) >> 1) +
		(A & B & lowPixelMask));
    }
    else
	return A;
}

static inline uint32 Q_INTERPOLATE (uint32 A, uint32 B, uint32 C, uint32 D)
{
    register uint32 x = ((A & qcolorMask) >> 2) +
	((B & qcolorMask) >> 2) +
	((C & qcolorMask) >> 2) + ((D & qcolorMask) >> 2);
    register uint32 y = (A & qlowpixelMask) +
	(B & qlowpixelMask) + (C & qlowpixelMask) + (D & qlowpixelMask);

    y = (y >> 2) & qlowpixelMask;
    return x + y;
}

#define BLUE_MASK565 0x001F001F
#define RED_MASK565 0xF800F800
#define GREEN_MASK565 0x07E007E0

#define BLUE_MASK555 0x001F001F
#define RED_MASK555 0x7C007C00
#define GREEN_MASK555 0x03E003E0

void Super2xSaI (uint8 *srcPtr, uint32 srcPitch,
		 uint8 *deltaPtr, uint8 *dstPtr, uint32 dstPitch,
		 int width, int height)
{
    uint16 *bP;
    uint8  *dP;
    uint32 inc_bP;

#ifdef MMX
    if (cpu_mmx)
    {
	while (height--)
	{
	    _2xSaISuper2xSaILine (srcPtr, deltaPtr, srcPitch, width,
				  dstPtr, dstPitch);
	    srcPtr += srcPitch;
	    dstPtr += dstPitch * 2;
	    deltaPtr += srcPitch;
	}
    }
    else
#endif

    {
        uint32 Nextline = srcPitch >> 1;
	inc_bP = 1;

	while (height--)
	{
	    bP = (uint16 *) srcPtr;
	    dP = (uint8 *) dstPtr;

	    for (uint32 finish = width; finish; finish -= inc_bP)
	    {
		uint32 color4, color5, color6;
		uint32 color1, color2, color3;
		uint32 colorA0, colorA1, colorA2, colorA3,
		    colorB0, colorB1, colorB2, colorB3, colorS1, colorS2;
		uint32 product1a, product1b, product2a, product2b;

//---------------------------------------    B1 B2
//                                         4  5  6 S2
//                                         1  2  3 S1
//                                           A1 A2

		colorB0 = *(bP - Nextline - 1);
		colorB1 = *(bP - Nextline);
		colorB2 = *(bP - Nextline + 1);
		colorB3 = *(bP - Nextline + 2);

		color4 = *(bP - 1);
		color5 = *(bP);
		color6 = *(bP + 1);
		colorS2 = *(bP + 2);

		color1 = *(bP + Nextline - 1);
		color2 = *(bP + Nextline);
		color3 = *(bP + Nextline + 1);
		colorS1 = *(bP + Nextline + 2);

		colorA0 = *(bP + Nextline + Nextline - 1);
		colorA1 = *(bP + Nextline + Nextline);
		colorA2 = *(bP + Nextline + Nextline + 1);
		colorA3 = *(bP + Nextline + Nextline + 2);

//--------------------------------------
		if (color2 == color6 && color5 != color3)
		{
		    product2b = product1b = color2;
		}
		else if (color5 == color3 && color2 != color6)
		{
		    product2b = product1b = color5;
		}
		else if (color5 == color3 && color2 == color6)
		{
		    register int r = 0;

		    r += GetResult (color6, color5, color1, colorA1);
		    r += GetResult (color6, color5, color4, colorB1);
		    r += GetResult (color6, color5, colorA2, colorS1);
		    r += GetResult (color6, color5, colorB2, colorS2);

		    if (r > 0)
			product2b = product1b = color6;
		    else if (r < 0)
			product2b = product1b = color5;
		    else
		    {
			product2b = product1b = INTERPOLATE (color5, color6);
		    }
		}
		else
		{
		    if (color6 == color3 && color3 == colorA1
			    && color2 != colorA2 && color3 != colorA0)
			product2b =
			    Q_INTERPOLATE (color3, color3, color3, color2);
		    else if (color5 == color2 && color2 == colorA2
			     && colorA1 != color3 && color2 != colorA3)
			product2b =
			    Q_INTERPOLATE (color2, color2, color2, color3);
		    else
			product2b = INTERPOLATE (color2, color3);

		    if (color6 == color3 && color6 == colorB1
			    && color5 != colorB2 && color6 != colorB0)
			product1b =
			    Q_INTERPOLATE (color6, color6, color6, color5);
		    else if (color5 == color2 && color5 == colorB2
			     && colorB1 != color6 && color5 != colorB3)
			product1b =
			    Q_INTERPOLATE (color6, color5, color5, color5);
		    else
			product1b = INTERPOLATE (color5, color6);
		}

		if (color5 == color3 && color2 != color6 && color4 == color5
			&& color5 != colorA2)
		    product2a = INTERPOLATE (color2, color5);
		else
		    if (color5 == color1 && color6 == color5
			&& color4 != color2 && color5 != colorA0)
		    product2a = INTERPOLATE (color2, color5);
		else
		    product2a = color2;

		if (color2 == color6 && color5 != color3 && color1 == color2
			&& color2 != colorB2)
		    product1a = INTERPOLATE (color2, color5);
		else
		    if (color4 == color2 && color3 == color2
			&& color1 != color5 && color2 != colorB0)
		    product1a = INTERPOLATE (color2, color5);
		else
		    product1a = color5;

		product1a = product1a | (product1b << 16);
		product2a = product2a | (product2b << 16);

		*((uint32 *) dP) = product1a;
		*((uint32 *) (dP + dstPitch)) = product2a;

		bP += inc_bP;
		dP += sizeof (uint32);
	    }			// end of for ( finish= width etc..)

	    srcPtr   += srcPitch;
	    dstPtr   += dstPitch * 2;
	    deltaPtr += srcPitch;
	}			// while (height--)
    }
}

void SuperEagle (uint8 *srcPtr, uint32 srcPitch, uint8 *deltaPtr, 
		 uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
    uint8  *dP;
    uint16 *bP;
    uint16 *xP;
    uint32 inc_bP;

#ifdef MMX
    if (cpu_mmx)
    {
	while (height--)
	{
	    _2xSaISuperEagleLine (srcPtr, deltaPtr, srcPitch, width,
				  dstPtr, dstPitch);
	    srcPtr += srcPitch;
	    dstPtr += dstPitch * 2;
	    deltaPtr += srcPitch;
	}
    }
    else
#endif

    {
	inc_bP = 1;

	uint32 Nextline = srcPitch >> 1;

	while (height--)
	{
	    bP = (uint16 *) srcPtr;
	    xP = (uint16 *) deltaPtr;
	    dP = dstPtr;
	    for (uint32 finish = width; finish; finish -= inc_bP)
	    {
		uint32 color4, color5, color6;
		uint32 color1, color2, color3;
		uint32 colorA1, colorA2, colorB1, colorB2, colorS1, colorS2;
		uint32 product1a, product1b, product2a, product2b;

		colorB1 = *(bP - Nextline);
		colorB2 = *(bP - Nextline + 1);

		color4 = *(bP - 1);
		color5 = *(bP);
		color6 = *(bP + 1);
		colorS2 = *(bP + 2);

		color1 = *(bP + Nextline - 1);
		color2 = *(bP + Nextline);
		color3 = *(bP + Nextline + 1);
		colorS1 = *(bP + Nextline + 2);

		colorA1 = *(bP + Nextline + Nextline);
		colorA2 = *(bP + Nextline + Nextline + 1);

		// --------------------------------------
		if (color2 == color6 && color5 != color3)
		{
		    product1b = product2a = color2;
		    if ((color1 == color2) || (color6 == colorB2))
		    {
			product1a = INTERPOLATE (color2, color5);
			product1a = INTERPOLATE (color2, product1a);
//                       product1a = color2;
		    }
		    else
		    {
			product1a = INTERPOLATE (color5, color6);
		    }

		    if ((color6 == colorS2) || (color2 == colorA1))
		    {
			product2b = INTERPOLATE (color2, color3);
			product2b = INTERPOLATE (color2, product2b);
//                       product2b = color2;
		    }
		    else
		    {
			product2b = INTERPOLATE (color2, color3);
		    }
		}
		else if (color5 == color3 && color2 != color6)
		{
		    product2b = product1a = color5;

		    if ((colorB1 == color5) || (color3 == colorS1))
		    {
			product1b = INTERPOLATE (color5, color6);
			product1b = INTERPOLATE (color5, product1b);
//                       product1b = color5;
		    }
		    else
		    {
			product1b = INTERPOLATE (color5, color6);
		    }

		    if ((color3 == colorA2) || (color4 == color5))
		    {
			product2a = INTERPOLATE (color5, color2);
			product2a = INTERPOLATE (color5, product2a);
//                       product2a = color5;
		    }
		    else
		    {
			product2a = INTERPOLATE (color2, color3);
		    }

		}
		else if (color5 == color3 && color2 == color6)
		{
		    register int r = 0;

		    r += GetResult (color6, color5, color1, colorA1);
		    r += GetResult (color6, color5, color4, colorB1);
		    r += GetResult (color6, color5, colorA2, colorS1);
		    r += GetResult (color6, color5, colorB2, colorS2);

		    if (r > 0)
		    {
			product1b = product2a = color2;
			product1a = product2b = INTERPOLATE (color5, color6);
		    }
		    else if (r < 0)
		    {
			product2b = product1a = color5;
			product1b = product2a = INTERPOLATE (color5, color6);
		    }
		    else
		    {
			product2b = product1a = color5;
			product1b = product2a = color2;
		    }
		}
		else
		{
		    product2b = product1a = INTERPOLATE (color2, color6);
		    product2b =
			Q_INTERPOLATE (color3, color3, color3, product2b);
		    product1a =
			Q_INTERPOLATE (color5, color5, color5, product1a);

		    product2a = product1b = INTERPOLATE (color5, color3);
		    product2a =
			Q_INTERPOLATE (color2, color2, color2, product2a);
		    product1b =
			Q_INTERPOLATE (color6, color6, color6, product1b);

//                    product1a = color5;
//                    product1b = color6;
//                    product2a = color2;
//                    product2b = color3;
		}
		product1a = product1a | (product1b << 16);
		product2a = product2a | (product2b << 16);

		*((uint32 *) dP) = product1a;
		*((uint32 *) (dP + dstPitch)) = product2a;
		*xP = color5;

		bP += inc_bP;
		xP += inc_bP;
		dP += sizeof (uint32);
	    }			// end of for ( finish= width etc..)

	    srcPtr += srcPitch;
	    dstPtr += dstPitch * 2;
	    deltaPtr += srcPitch;
	}			// endof: while (height--)
    }
}

void _2xSaI (uint8 *srcPtr, uint32 srcPitch, uint8 *deltaPtr,
	     uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
    uint8  *dP;
    uint16 *bP;
    uint32 inc_bP;

#ifdef MMX
    if (cpu_mmx)
    {
	while (height--)
	{
	    _2xSaILine (srcPtr, deltaPtr, srcPitch, width, dstPtr, dstPitch);
	    srcPtr += srcPitch;
	    dstPtr += dstPitch * 2;
	    deltaPtr += srcPitch;
	}
    }