/***************************************************************************

  - BG layer 32x128 , 8x8 tiles 4bpp , 2 palettes  (2nd is black )
  - TXT layer 32x32 , 8x8 tiles 4bpp , 2 palettes (2nd is black)
  - Sprites 16x16 3bpp, 8 palettes (0-3 are black)

  'Special' effects :

  - spotlight - gfx(BG+Sprites) outside spotlight is using black pals
                spotlight masks are taken from ROM pr8
                simulated using bitmaps and custom clipping rect

  - lightning - BG color change (darkening ?) - simple analog circ.
                            simulated by additional palette

In debug build press 'w' for spotlight and 'e' for lightning

***************************************************************************/
#include "driver.h"

static int pitnrun_h_heed;
static int pitnrun_v_heed;
static int pitnrun_ha;
static int pitnrun_scroll;
static int pitnrun_char_bank;
static int pitnrun_color_select;
static mame_bitmap *tmp_bitmap[4];
static tilemap *bg, *fg;
UINT8* pitnrun_videoram2;


static TILE_GET_INFO( get_tile_info1 )
{
	int code;
	code = videoram[tile_index];
	SET_TILE_INFO(
		0,
		code,
		0,
		0)
}

static TILE_GET_INFO( get_tile_info2 )
{
	int code;
	code = pitnrun_videoram2[tile_index];
	SET_TILE_INFO(
		1,
		code + (pitnrun_char_bank<<8),
		pitnrun_color_select&1,
		0)
}

WRITE8_HANDLER( pitnrun_videoram_w )
{
	videoram[offset] = data;
	tilemap_mark_all_tiles_dirty( fg );
}

WRITE8_HANDLER( pitnrun_videoram2_w )
{
	pitnrun_videoram2[offset] = data;
	tilemap_mark_all_tiles_dirty( bg );
}


READ8_HANDLER( pitnrun_videoram_r )
{
	return videoram[offset];
}

READ8_HANDLER( pitnrun_videoram2_r )
{
	return pitnrun_videoram2[offset];
}

WRITE8_HANDLER( pitnrun_char_bank_select )
{
	if(pitnrun_char_bank!=data)
	{
		tilemap_mark_all_tiles_dirty( bg );
		pitnrun_char_bank=data;
	}
}


WRITE8_HANDLER( pitnrun_scroll_w )
{
	pitnrun_scroll = (pitnrun_scroll & (0xff<<((offset)?0:8))) |( data<<((offset)?8:0));
	tilemap_set_scrollx( bg, 0, pitnrun_scroll);
}

WRITE8_HANDLER(pitnrun_ha_w)
{
	pitnrun_ha=data;
}

WRITE8_HANDLER(pitnrun_h_heed_w)
{
	pitnrun_h_heed=data;
}

WRITE8_HANDLER(pitnrun_v_heed_w)
{
	pitnrun_v_heed=data;
}

WRITE8_HANDLER(pitnrun_color_select_w)
{
	pitnrun_color_select=data;
	tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
}

void pitnrun_spotlights(void)
{
	int x,y,i,b,datapix;
	UINT8 *ROM = memory_region(REGION_USER1);
	for(i=0;i<4;i++)
	 for(y=0;y<128;y++)
	  for(x=0;x<16;x++)
	  {
	  	datapix=ROM[128*16*i+x+y*16];
	  	for(b=0;b<8;b++)
	  	{
			*BITMAP_ADDR16(tmp_bitmap[i], y, x*8+(7-b)) = (datapix&1);
			datapix>>=1;
		}
 	  }
}


PALETTE_INIT (pitnrun)
{
	int i;
	int bit0,bit1,bit2,r,g,b;
	for (i = 0;i < 32*3; i++)
	{
		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = (color_prom[i] >> 3) & 0x01;
		bit1 = (color_prom[i] >> 4) & 0x01;
		bit2 = (color_prom[i] >> 5) & 0x01;
		g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = 0;
		bit1 = (color_prom[i] >> 6) & 0x01;
		bit2 = (color_prom[i] >> 7) & 0x01;
		b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

		palette_set_color(machine,i,MAKE_RGB(r,g,b));
	}

	/* fake bg palette for lightning effect*/
	for(i=2*16;i<2*16+16;i++)
	{
		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = (color_prom[i] >> 3) & 0x01;
		bit1 = (color_prom[i] >> 4) & 0x01;
		bit2 = (color_prom[i] >> 5) & 0x01;
		g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		bit0 = 0;
		bit1 = (color_prom[i] >> 6) & 0x01;
		bit2 = (color_prom[i] >> 7) & 0x01;
		b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
		r/=3;
		g/=3;
		b/=3;

		palette_set_color_rgb(machine,i+16,(r>0xff)?0xff:r,(g>0xff)?0xff:g,(b>0xff)?0xff:b);

	}
}

VIDEO_START(pitnrun)
{
	fg = tilemap_create( get_tile_info1,tilemap_scan_rows,TILEMAP_TRANSPARENT,8,8,32,32 );
	bg = tilemap_create( get_tile_info2,tilemap_scan_rows,TILEMAP_OPAQUE,8,8,32*4,32 );
	tilemap_set_transparent_pen( fg, 0 );
	tmp_bitmap[0] = auto_bitmap_alloc(128,128,machine->screen[0].format);
	tmp_bitmap[1] = auto_bitmap_alloc(128,128,machine->screen[0].format);
	tmp_bitmap[2] = auto_bitmap_alloc(128,128,machine->screen[0].format);
	tmp_bitmap[3] = auto_bitmap_alloc(128,128,machine->screen[0].format);
	pitnrun_spotlights();
	video_start_generic(machine);
}

static void pitnrun_draw_sprites( mame_bitmap *bitmap, const rectangle *cliprect )
{
	int sx, sy, flipx, flipy, offs,pal;

	for (offs = 0 ; offs < 0x100; offs+=4)
	{

		pal=spriteram[offs+2]&0x3;

		sy = 256-spriteram[offs+0]-16;
		sx = spriteram[offs+3];
		flipy = (spriteram[offs+1]&0x80)>>7;
		flipx = (spriteram[offs+1]&0x40)>>6;

		if (flip_screen_x)
		{
			sx = 256 - sx;
			flipx = !flipx;
		}
		if (flip_screen_y)
		{
			sy = 240 - sy;
			flipy = !flipy;
		}

		drawgfx(bitmap,Machine->gfx[2],
 			(spriteram[offs+1]&0x3f)+((spriteram[offs+2]&0x80)>>1)+((spriteram[offs+2]&0x40)<<1),
			pal,
			flipx,flipy,
			sx,sy,
			cliprect,TRANSPARENCY_PEN,0);
	}
}

VIDEO_UPDATE( pitnrun )
{
	int dx=0,dy=0;
	rectangle myclip=*cliprect;

#ifdef MAME_DEBUG
	if (code_pressed_memory(KEYCODE_Q))
	{
		UINT8 *ROM = memory_region(REGION_CPU1);
		ROM[0x84f6]=0; /* lap 0 - normal */
	}

	if (code_pressed_memory(KEYCODE_W))
	{
		UINT8 *ROM = memory_region(REGION_CPU1);
		ROM[0x84f6]=6; /* lap 6 = spotlight */
	}

	if (code_pressed_memory(KEYCODE_E))
	{
		UINT8 *ROM = memory_region(REGION_CPU1);
		ROM[0x84f6]=2; /* lap 3 (trial 2)= lightnings */
		ROM[0x8102]=1;
	}
#endif

	fillbitmap(bitmap,0,cliprect);

	if(!(pitnrun_ha&4))
		tilemap_draw(bitmap,cliprect,bg, 0,0);
	else
	{
		dx=128-pitnrun_h_heed+((pitnrun_ha&8)<<5)+3;
		dy=128-pitnrun_v_heed+((pitnrun_ha&0x10)<<4);

		if (flip_screen_x)
			dx=128-dx+16;

		if (flip_screen_y)
			dy=128-dy;

		myclip.min_x=dx;
		myclip.min_y=dy;
		myclip.max_x=dx+127;
		myclip.max_y=dy+127;


		if(myclip.min_y<cliprect->min_y)myclip.min_y=cliprect->min_y;
		if(myclip.min_x<cliprect->min_x)myclip.min_x=cliprect->min_x;

		if(myclip.max_y>cliprect->max_y)myclip.max_y=cliprect->max_y;
		if(myclip.max_x>cliprect->max_x)myclip.max_x=cliprect->max_x;

		tilemap_draw(bitmap,&myclip,bg, 0,0);
	}

	pitnrun_draw_sprites(bitmap,&myclip);

	if(pitnrun_ha&4)
		copybitmap(bitmap,tmp_bitmap[pitnrun_ha&3],flip_screen_x,flip_screen_y,dx,dy,&myclip,TRANSPARENCY_PEN, 1);
	tilemap_draw(bitmap,cliprect,fg, 0,0);
	return 0;
}




