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

 Lethal Enforcers
 (c) 1992 Konami

 Video hardware emulation.

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

#include "driver.h"
#include "video/konamiic.h"

#define GUNX( a ) ( ( readinputport( a ) * 287 ) / 0xff )
#define GUNY( a ) ( ( readinputport( a ) * 223 ) / 0xff )

static int sprite_colorbase;
static int layer_colorbase[4];
//static int layerpri[4] ={ 1,2,4,0 };

static void lethalen_sprite_callback(int *code, int *color, int *priority_mask)
{
	int pri = (*color & 0xfff0);
	*color = *color & 0x000f;
	*color+=0x400/64; // colourbase?

	/* this isn't ideal.. shouldn't need to hardcode it? not 100% sure about it anyway*/
	if (pri==0x10) *priority_mask = 0xf0; // guys on first level
	else if (pri==0x90) *priority_mask = 0xf0; // car doors
	else if (pri==0x20) *priority_mask = 0xf0|0xcc; // people behind glass on 1st level
	else if (pri==0xa0) *priority_mask = 0xf0|0xcc; // glass on 1st/2nd level
	else if (pri==0x40) *priority_mask = 0; // blood splats?
	else if (pri==0x00) *priority_mask = 0; // gunshots etc
	else if (pri==0x30) *priority_mask = 0xf0|0xcc|0xaa; // mask sprites (always in a bad colour, used to do special effects i think
	else
	{
		popmessage("unknown pri %04x\n",pri);
		*priority_mask = 0;
	}

	*code = (*code & 0x3fff); // | spritebanks[(*code >> 12) & 3];
}

static void lethalen_tile_callback(int layer, int *code, int *color)
{
	*color = layer_colorbase[layer] + ((*color & 0x3c)<<2);
}

VIDEO_START(lethalen)
{
	int i;

	K053251_vh_start();

	K056832_vh_start(REGION_GFX1, K056832_BPP_8LE, 1, NULL, lethalen_tile_callback, 0);

	if (K053245_vh_start(0, REGION_GFX3,NORMAL_PLANE_ORDER, lethalen_sprite_callback))
		return 1;

	/* the default drawmode table is no good for 6bpp, create a new one */
	gfx_drawmode_table[0] = DRAWMODE_NONE;
	for (i = 1;i < 64;i++)
		gfx_drawmode_table[i] = DRAWMODE_SOURCE;

	gfx_drawmode_table[63] = DRAWMODE_SHADOW;

	// this game uses external linescroll RAM
	K056832_SetExtLinescroll();

	// the US and Japanese cabinets apparently use different mirror setups
	if (!strcmp(machine->gamedrv->name, "lethalej"))
	{
		K056832_set_LayerOffset(0, -196, 0);
		K056832_set_LayerOffset(1, -194, 0);
		K056832_set_LayerOffset(2, -192, 0);
		K056832_set_LayerOffset(3, -190, 0);
		K053245_set_SpriteOffset(0, -105, 0);
	}
	else
	{ /* fixme */
 		K056832_set_LayerOffset(0, 188, 0);
		K056832_set_LayerOffset(1, 190, 0);
		K056832_set_LayerOffset(2, 192, 0);
		K056832_set_LayerOffset(3, 194, 0);
		K053245_set_SpriteOffset(0, 95, 0);
	}

	layer_colorbase[0] = 0x00;
	layer_colorbase[1] = 0x40;
	layer_colorbase[2] = 0x80;
	layer_colorbase[3] = 0xc0;

	return 0;
}

WRITE8_HANDLER(le_palette_control)
{
	switch (offset)
	{
		case 0:	// 40c8 - PCU1 from schematics
			layer_colorbase[0] = ((data & 0x7)-1) * 0x40;
			layer_colorbase[1] = (((data>>4) & 0x7)-1) * 0x40;
			K056832_mark_plane_dirty(0);
			K056832_mark_plane_dirty(1);
			break;

		case 4: // 40cc - PCU2 from schematics
			layer_colorbase[2] = ((data & 0x7)-1) * 0x40;
			layer_colorbase[3] = (((data>>4) & 0x7)-1) * 0x40;
			K056832_mark_plane_dirty(2);
			K056832_mark_plane_dirty(3);
			break;

		case 8:	// 40d0 - PCU3 from schematics
			sprite_colorbase = ((data & 0x7)-1) * 0x40;
			break;
	}
}

extern UINT16 *K056832_videoram;

VIDEO_UPDATE(lethalen)
{
	fillbitmap(bitmap, 7168, cliprect);
	fillbitmap(priority_bitmap, 0, cliprect);

	K056832_tilemap_draw(bitmap, cliprect, 3, 0, 1);
	K056832_tilemap_draw(bitmap, cliprect, 2, 0, 2);
	K056832_tilemap_draw(bitmap, cliprect, 1, 0, 4);

	K053245_sprites_draw_lethal(0, bitmap, cliprect);

	// force "A" layer over top of everything
	K056832_tilemap_draw(bitmap, cliprect, 0, 0, 0);


#if 0
	{
		FILE *fp;

		fp=fopen("K056832_videoram", "w+b");
		if (fp)
		{
			fwrite(K056832_videoram, 0x10000, 2, fp);
			fclose(fp);
		}
	}
#endif
	return 0;
}
