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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996, 1997, 1998, 1999 Gary Henderson (gary@daniver.demon.co.uk) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997, 1998, 1999 Ivar (Ivar@snes9x.com) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* DOS port code contains the works of other authors. See headers in
* individual files.
*
* Snes9x homepage: 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 <sys/farptr.h>
#include "snes9x.h"
#include "port.h"
#include "gfx.h"
#include <allegro.h>
extern uint32 screen_width;
extern uint32 screen_height;
void TVMode (uint8 *srcPtr, uint32 srcPitch,
uint8 *deltaPtr,
BITMAP *dstBitmap, int width, int height)
{
uint8 *finish;
uint32 dstPitch = dstBitmap->w * 2;
uint32 line;
uint32 x_offset;
uint32 fraction;
uint32 error = 0;
uint32 colorMask = ~(RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 16));
uint32 lowPixelMask = RGB_LOW_BITS_MASK;
if (height * 2 <= screen_height)
{
line = (screen_height - height * 2) >> 1;
fraction = 0x10000;
}
else
{
line = 0;
fraction = ((screen_height - height) * 0x10000) / height;
}
_farsetsel (dstBitmap->seg);
if (width == 512)
{
// Offset into scanline in bytes, since each pixel takes two bytes,
// no divide by two.
x_offset = screen_width - width;
do
{
uint32 *bP = (uint32 *) srcPtr;
uint32 *xP = (uint32 *) deltaPtr;
uint32 dP = bmp_write_line (dstBitmap, line) + x_offset;
uint32 currentPixel;
uint32 currentDelta;
finish = (uint8 *) bP + ((width + 2) << 1);
if ((error += fraction) >= 0x10000)
{
error -= 0x10000;
do
{
currentPixel = *bP++;
if (currentPixel != *xP++)
{
uint32 product, darkened;
*(xP - 1) = currentPixel;
_farnspokel (dP, currentPixel);
darkened = (product = ((currentPixel & colorMask) >> 1));
darkened += (product = ((product & colorMask) >> 1));
darkened += (product & colorMask) >> 1;
_farnspokel (dP + dstPitch, darkened);
}
dP += 4;
} while ((uint8 *) bP < finish);
line += 2;
}
else
{
do
{
currentPixel = *bP++;
if (currentPixel != *xP++)
{
*(xP - 1) = currentPixel;
_farnspokel (dP, currentPixel);
}
dP += 4;
} while ((uint8 *) bP < finish);
line++;
}
deltaPtr += srcPitch;
srcPtr += srcPitch;
} while (--height);
}
else
{
x_offset = (screen_width - width * 2);
do
{
uint32 *bP = (uint32 *) srcPtr;
uint32 *xP = (uint32 *) deltaPtr;
uint32 dP = bmp_write_line (dstBitmap, line) + x_offset;
uint32 currentPixel;
uint32 nextPixel;
uint32 currentDelta;
uint32 nextDelta;
finish = (uint8 *) bP + ((width + 2) << 1);
nextPixel = *bP++;
nextDelta = *xP++;
if ((error += fraction) >= 0x10000)
{
error -= 0x10000;
do
{
currentPixel = nextPixel;
currentDelta = nextDelta;
nextPixel = *bP++;
nextDelta = *xP++;
if ((nextPixel != nextDelta) || (currentPixel != currentDelta))
{
uint32 colorA, colorB, product, darkened;
*(xP - 2) = currentPixel;
colorA = currentPixel & 0xffff;
colorB = (currentPixel & 0xffff0000) >> 16;
product = colorA |
((((colorA & colorMask) >> 1) +
((colorB & colorMask) >> 1) +
(colorA & colorB & lowPixelMask)) << 16);
_farnspokel (dP, product);
darkened = (product = ((product & colorMask) >> 1));
darkened += (product = ((product & colorMask) >> 1));
darkened += (product & colorMask) >> 1;
_farnspokel (dP + dstPitch, darkened);
colorA = nextPixel & 0xffff;
product = colorB |
((((colorA & colorMask) >> 1) +
((colorB & colorMask) >> 1) +
(colorA & colorB & lowPixelMask)) << 16);
_farnspokel (dP + 4, product);
darkened = (product = ((product & colorMask) >> 1));
darkened += (product = ((product & colorMask) >> 1));
darkened += (product & colorMask) >> 1;
_farnspokel (dP + dstPitch + 4, darkened);
}
dP += 8;
} while ((uint8 *) bP < finish);
line += 2;
}
else
{
do
{
currentPixel = nextPixel;
currentDelta = nextDelta;
nextPixel = *bP++;
nextDelta = *xP++;
if ((nextPixel != nextDelta) || (currentPixel != currentDelta))
{
uint32 colorA, colorB, product;
*(xP - 2) = currentPixel;
colorA = currentPixel & 0xffff;
colorB = (currentPixel & 0xffff0000) >> 16;
product = colorA |
((((colorA & colorMask) >> 1) +
((colorB & colorMask) >> 1) +
(colorA & colorB & lowPixelMask)) << 16);
_farnspokel (dP, product);
colorA = nextPixel & 0xffff;
product = colorB |
((((colorA & colorMask) >> 1) +
((colorB & colorMask) >> 1) +
(colorA & colorB & lowPixelMask)) << 16);
_farnspokel (dP + 4, product);
}
dP += 8;
} while ((uint8 *) bP < finish);
line++;
}
deltaPtr += srcPitch;
srcPtr += srcPitch;
} while (--height);
}
}
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