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

    Jaleco fcombat

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

#include "emu.h"
#include "includes/fcombat.h"


static TILE_GET_INFO( get_bg_tile_info )
{
	int tileno, palno;	//32*16 x 32

	//palno = (tile_index - (tile_index / 32 * 16) * 32 * 16) / 32;

	tileno = machine.region("user1")->base()[tile_index];
	palno = 0x18; //machine.region("user2")->base()[tile_index] >> 3;
	SET_TILE_INFO(2, tileno, palno, 0);
}


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

  Convert the color PROMs into a more useable format.

  The palette PROM is connected to the RGB output this way:

  bit 7 -- 220 ohm resistor  -- BLUE
        -- 470 ohm resistor  -- BLUE
        -- 220 ohm resistor  -- GREEN
        -- 470 ohm resistor  -- GREEN
        -- 1  kohm resistor  -- GREEN
        -- 220 ohm resistor  -- RED
        -- 470 ohm resistor  -- RED
  bit 0 -- 1  kohm resistor  -- RED

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

PALETTE_INIT( fcombat )
{
	int i;

	/* allocate the colortable */
	machine.colortable = colortable_alloc(machine, 0x20);

	/* create a lookup table for the palette */
	for (i = 0; i < 0x20; i++)
	{
		int bit0, bit1, bit2;
		int r, g, b;

		/* red component */
		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;

		/* green component */
		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;

		/* blue component */
		bit0 = 0;
		bit1 = (color_prom[i] >> 6) & 0x01;
		bit2 = (color_prom[i] >> 7) & 0x01;
		b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

		colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
	}

	/* color_prom now points to the beginning of the lookup table */
	color_prom += 0x20;

	/* fg chars/sprites */
	for (i = 0; i < 0x200; i++)
	{
		UINT8 ctabentry = (color_prom[(i & 0x1c0) | ((i & 3) << 4) | ((i >> 2) & 0x0f)] & 0x0f) | 0x10;
		colortable_entry_set_value(machine.colortable, i, ctabentry);
	}

	/* bg chars (this is not the full story... there are four layers mixed */
	/* using another PROM */
	for (i = 0x200; i < 0x300; i++)
	{
		UINT8 ctabentry = color_prom[i] & 0x0f;
		colortable_entry_set_value(machine.colortable, i, ctabentry);
	}
}



/*************************************
 *
 *  Video system startup
 *
 *************************************/

VIDEO_START( fcombat )
{
	fcombat_state *state = machine.driver_data<fcombat_state>();
	state->m_bgmap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 16, 16, 32 * 8 * 2, 32);
}



/*************************************
 *
 *  Video register I/O
 *
 *************************************/

WRITE8_HANDLER( fcombat_videoreg_w )
{
	fcombat_state *state = space->machine().driver_data<fcombat_state>();

	/* bit 0 = flip screen and joystick input multiplexor */
	state->m_cocktail_flip = data & 1;

	/* bits 1-2 char lookup table bank */
	state->m_char_palette = (data & 0x06) >> 1;

	/* bits 3 char bank */
	state->m_char_bank = (data & 0x08) >> 3;

	/* bits 4-5 unused */

	/* bits 6-7 sprite lookup table bank */
	state->m_sprite_palette = 0;//(data & 0xc0) >> 6;
	//popmessage("%08x",data);
}



SCREEN_UPDATE( fcombat )
{
	fcombat_state *state = screen->machine().driver_data<fcombat_state>();
	int sx, sy, offs, i;

	/* draw background */
	tilemap_set_scrolly(state->m_bgmap, 0, state->m_fcombat_sh);
	tilemap_set_scrollx(state->m_bgmap, 0, state->m_fcombat_sv - 24);

	tilemap_mark_all_tiles_dirty(state->m_bgmap);
	tilemap_draw(bitmap, cliprect, state->m_bgmap, 0, 0);
	//draw_background(bitmap, cliprect);

	/* draw sprites */
	for (i = 0; i < state->m_spriteram_size; i += 4)
	{
		int flags = state->m_spriteram[i + 0];
		int y = state->m_spriteram[i + 1] ^ 255;
		int code = state->m_spriteram[i + 2] + ((flags & 0x20) << 3);
		int x = state->m_spriteram[i + 3] * 2 + 72;

		int xflip = flags & 0x80;
		int yflip = flags & 0x40;
		int doubled =0;// flags & 0x10;
		int wide = flags & 0x08;
		int code2 = code;

		int color = ((flags >> 1) & 0x03) | ((code >> 5) & 0x04) | (code & 0x08) | (state->m_sprite_palette * 16);
				const gfx_element *gfx = screen->machine().gfx[1];

		if (state->m_cocktail_flip)
		{
			x = 64 * 8 - gfx->width - x;
			y = 32 * 8 - gfx->height - y;
			if (wide) y -= gfx->height;
			xflip = !xflip;
			yflip = !yflip;
		}

		if (wide)
		{
			if (yflip)
				code |= 0x10, code2 &= ~0x10;
			else
				code &= ~0x10, code2 |= 0x10;

			drawgfx_transpen(bitmap, cliprect, gfx, code2, color, xflip, yflip, x, y + gfx->height, 0);
		}

		if(flags&0x10)
		{
			drawgfx_transpen(bitmap, cliprect, gfx, code2 + 16, color, xflip, yflip, x, y + gfx->height, 0);
			drawgfx_transpen(bitmap, cliprect, gfx, code2 + 16 * 2, color, xflip, yflip, x, y + 2 * gfx->height, 0);
			drawgfx_transpen(bitmap, cliprect, gfx, code2 + 16 * 3, color, xflip, yflip, x, y + 3 * gfx->height, 0);

		}

		drawgfx_transpen(bitmap, cliprect, gfx, code, color, xflip, yflip, x, y, 0);

		if (doubled) i += 4;
	}

	/* draw the visible text layer */
	for (sy = VISIBLE_Y_MIN/8; sy < VISIBLE_Y_MAX/8; sy++)
		for (sx = VISIBLE_X_MIN/8; sx < VISIBLE_X_MAX/8; sx++)
		{
			int x = state->m_cocktail_flip ? (63 * 8 - 8 * sx) : 8 * sx;
			int y = state->m_cocktail_flip ? (31 * 8 - 8 * sy) : 8 * sy;

			offs = sx + sy * 64;
			drawgfx_transpen(bitmap, cliprect, screen->machine().gfx[0],
				state->m_videoram[offs] + 256 * state->m_char_bank,
				((state->m_videoram[offs] & 0xf0) >> 4) + state->m_char_palette * 16,
				state->m_cocktail_flip, state->m_cocktail_flip, x, y, 0);
		}
	return 0;
}
