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

  video.c

  Functions to emulate the video hardware of the machine.

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

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


PALETTE_INIT( ponttehk )
{
	int i;

	for ( i = 0; i < machine.total_colors(); i++ )
	{
		int bit0,bit1,bit2,bit3,r,g,b;

		/* red component */
		bit0 = (color_prom[0] >> 0) & 0x01;
		bit1 = (color_prom[0] >> 1) & 0x01;
		bit2 = (color_prom[0] >> 2) & 0x01;
		bit3 = (color_prom[0] >> 3) & 0x01;
		r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

		/* green component */
		bit0 = (color_prom[machine.total_colors()] >> 0) & 0x01;
		bit1 = (color_prom[machine.total_colors()] >> 1) & 0x01;
		bit2 = (color_prom[machine.total_colors()] >> 2) & 0x01;
		bit3 = (color_prom[machine.total_colors()] >> 3) & 0x01;
		g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

		/* blue component */
		bit0 = (color_prom[2*machine.total_colors()] >> 0) & 0x01;
		bit1 = (color_prom[2*machine.total_colors()] >> 1) & 0x01;
		bit2 = (color_prom[2*machine.total_colors()] >> 2) & 0x01;
		bit3 = (color_prom[2*machine.total_colors()] >> 3) & 0x01;
		b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

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

		color_prom++;
	}
}

PALETTE_INIT( lvcards ) //Ever so slightly different, but different enough.
{
	int i;

	for ( i = 0; i < machine.total_colors(); i++ )
	{
		int bit0,bit1,bit2,bit3,r,g,b;

		/* red component */
		bit0 = (color_prom[0] >> 0) & 0x11;
		bit1 = (color_prom[0] >> 1) & 0x11;
		bit2 = (color_prom[0] >> 2) & 0x11;
		bit3 = (color_prom[0] >> 3) & 0x11;
		r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

		/* green component */
		bit0 = (color_prom[machine.total_colors()] >> 0) & 0x11;
		bit1 = (color_prom[machine.total_colors()] >> 1) & 0x11;
		bit2 = (color_prom[machine.total_colors()] >> 2) & 0x11;
		bit3 = (color_prom[machine.total_colors()] >> 3) & 0x11;
		g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

		/* blue component */
		bit0 = (color_prom[2*machine.total_colors()] >> 0) & 0x11;
		bit1 = (color_prom[2*machine.total_colors()] >> 1) & 0x11;
		bit2 = (color_prom[2*machine.total_colors()] >> 2) & 0x11;
		bit3 = (color_prom[2*machine.total_colors()] >> 3) & 0x11;
		b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

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

		color_prom++;
	}
}

WRITE8_HANDLER( lvcards_videoram_w )
{
	lvcards_state *state = space->machine().driver_data<lvcards_state>();
	state->m_videoram[offset] = data;
	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}

WRITE8_HANDLER( lvcards_colorram_w )
{
	lvcards_state *state = space->machine().driver_data<lvcards_state>();
	state->m_colorram[offset] = data;
	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}

static TILE_GET_INFO( get_bg_tile_info )
{
	lvcards_state *state = machine.driver_data<lvcards_state>();
	int attr = state->m_colorram[tile_index];
	int code = state->m_videoram[tile_index] + ((attr & 0x30) << 4) + ((attr & 0x80) << 3);
	int color = attr & 0x0f;
	int flags = (attr & 0x40) ? TILE_FLIPX : 0;

	SET_TILE_INFO(0, code, color, flags);
}

VIDEO_START( lvcards )
{
	lvcards_state *state = machine.driver_data<lvcards_state>();
	state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows,
		 8, 8, 32, 32);
}

SCREEN_UPDATE( lvcards )
{
	lvcards_state *state = screen->machine().driver_data<lvcards_state>();
	tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
	return 0;
}
