/*
Copyright (C) 1997-2006 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )

http://www.zsnes.com
http://sourceforge.net/projects/zsnes

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.

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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/



#ifdef __UNIXSDL__
#include "gblhdr.h"
#define DIR_SLASH "/"
#else
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <sys/stat.h>
#include "ntsc.h"
#define DIR_SLASH "\\"
#endif

extern unsigned int newengen, nggposng[2];
extern unsigned short PrevPicture[64*56], *vidbuffer, *vidbufferofsb;

void CapturePicture()
{
    unsigned short work1, work2, filter;
    unsigned int i, j, offset, pppos=0;

    if ((newengen & 0xFF) && ((nggposng[0] & 0xFF) == 5))
    {
	filter = 0x7BDE;	// 0111 1011 1101 1110
    }
    else
    {
	filter = 0xF7DE;	// 1111 0111 1101 1110
    }

    for (j=0 ; j<56 ; j++)
    {
	offset = 288+16+j*288*4;

	for (i=0 ; i<64 ; i++)
	{
	    work1 = ((vidbuffer[offset] & filter)>>1) + ((vidbuffer[offset+2] & filter)>>1);
	    work2 = ((vidbuffer[offset+288] & filter)>>1) + ((vidbuffer[offset+288+2] & filter)>>1);
	    PrevPicture[pppos] = ((work1 & filter)>>1) + ((work2 & filter)>>1);
	    offset += 4;
	    pppos++;
	}
    }

    if ((newengen & 0xFF) && ((nggposng[0] & 0xFF) == 5))
    {
	for (pppos=0 ; pppos<64*56 ; pppos++)
	{
	    PrevPicture[pppos] = ((PrevPicture[pppos] & 0x7FE0)<<1)|(PrevPicture[pppos] & 0x001F);
	} // 0111 1111 1110 0000 and 0000 0000 0001 1111
    }
}


void Clear2xSaIBuffer()
{
  memset(vidbufferofsb+288, 0xFF, 576*239);
}

// NTSC filter variables

unsigned char ntsc_phase = 0;
snes_ntsc_setup_t ntsc_setup;
snes_ntsc_t ntsc_snes;
extern unsigned char NTSCBlend;

// Init NTSC filter command, should be called whenever changes are made in the GUI related to the GUI
void NTSCFilterInit()
{
   // Set GUI options
   ntsc_setup.merge_fields = NTSCBlend;

   snes_ntsc_init(&ntsc_snes, &ntsc_setup);
}

void NTSCFilterDraw(int SurfaceX, int SurfaceY, int pitch, unsigned char *buffer)
{
   snes_ntsc_blit(&ntsc_snes, vidbuffer+16, 576, ntsc_phase, SurfaceX, SurfaceY, buffer, pitch);

   // Change phase on alternating frames
   ntsc_phase ^= 1;
}