text: #include "emu.h"
  #include "video/resnet.h"
  #include "includes/gotya.h"
  
  
  /***************************************************************************
  
    Convert the color PROMs into a more useable format.
  
  ***************************************************************************/
  
  PALETTE_INIT( gotya )
  {
  	static const int resistances_rg[3] = { 1000, 470, 220 };
  	static const int resistances_b [2] = { 470, 220 };
  	double rweights[3], gweights[3], bweights[2];
  	int i;
  
  	/* compute the color output resistor weights */
  	compute_resistor_weights(0,	255, -1.0,
  			3, &resistances_rg[0], rweights, 0, 0,
  			3, &resistances_rg[0], gweights, 0, 0,
  			2, &resistances_b[0],  bweights, 0, 0);
  
  	/* allocate the colortable */
  	machine.colortable = colortable_alloc(machine, 32);
  
  	/* 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 = combine_3_weights(rweights, bit0, bit1, bit2);
  
  		/* green component */
  		bit0 = (color_prom[i] >> 3) & 0x01;
  		bit1 = (color_prom[i] >> 4) & 0x01;
  		bit2 = (color_prom[i] >> 5) & 0x01;
  		g = combine_3_weights(gweights, bit0, bit1, bit2);
  
  		/* blue component */
  		bit0 = (color_prom[i] >> 6) & 0x01;
  		bit1 = (color_prom[i] >> 7) & 0x01;
  		b = combine_2_weights(bweights, bit0, bit1);
  
  		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 += 32;
  
  	for (i = 0; i < 0x40; i++)
  	{
  		UINT8 ctabentry = color_prom[i] & 0x07;
  		colortable_entry_set_value(machine.colortable, i, ctabentry);
  	}
  }
  
  WRITE8_HANDLER( gotya_videoram_w )
  {
  	gotya_state *state = space->machine().driver_data<gotya_state>();
  	state->m_videoram[offset] = data;
  	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
  }
  
  WRITE8_HANDLER( gotya_colorram_w )
  {
  	gotya_state *state = space->machine().driver_data<gotya_state>();
  	state->m_colorram[offset] = data;
  	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
  }
  
  WRITE8_HANDLER( gotya_video_control_w )
  {
  	gotya_state *state = space->machine().driver_data<gotya_state>();
  
  	/* bit 0 - scroll bit 8
         bit 1 - flip screen
         bit 2 - sound disable ??? */
  
  	state->m_scroll_bit_8 = data & 0x01;
  
  	if (flip_screen_get(space->machine()) != (data & 0x02))
  	{
  		flip_screen_set(space->machine(), data & 0x02);
  		tilemap_mark_all_tiles_dirty_all(space->machine());
  	}
  }
  
  static TILE_GET_INFO( get_bg_tile_info )
  {
  	gotya_state *state = machine.driver_data<gotya_state>();
  	int code = state->m_videoram[tile_index];
  	int color = state->m_colorram[tile_index] & 0x0f;
  
  	SET_TILE_INFO(0, code, color, 0);
  }
  
  static TILEMAP_MAPPER( tilemap_scan_rows_thehand )
  {
  	/* logical (col,row) -> memory offset */
  	row = 31 - row;
  	col = 63 - col;
  	return ((row) * (num_cols >> 1)) + (col & 31) + ((col >> 5) * 0x400);
  }
  
  VIDEO_START( gotya )
  {
  	gotya_state *state = machine.driver_data<gotya_state>();
  	state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows_thehand, 8, 8, 64, 32);
  }
  
  static void draw_status_row( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect, int sx, int col )
  {
  	gotya_state *state = machine.driver_data<gotya_state>();
  	int row;
  
  	if (flip_screen_get(machine))
  	{
  		sx = 35 - sx;
  	}
  
  	for (row = 29; row >= 0; row--)
  	{
  		int sy;
  
  		if (flip_screen_get(machine))
  			sy = row;
  		else
  			sy = 31 - row;
  
  		drawgfx_opaque(bitmap,cliprect,
  			machine.gfx[0],
  			state->m_videoram2[row * 32 + col],
  			state->m_videoram2[row * 32 + col + 0x10] & 0x0f,
  			flip_screen_x_get(machine), flip_screen_y_get(machine),
  			8 * sx, 8 * sy);
  	}
  }
  
  static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
  {
  	gotya_state *state = machine.driver_data<gotya_state>();
  	UINT8 *spriteram = state->m_spriteram;
  	int offs;
  
  	for (offs = 2; offs < 0x0e; offs += 2)
  	{
  		int code = spriteram[offs + 0x01] >> 2;
  		int color = spriteram[offs + 0x11] & 0x0f;
  		int sx = 256 - spriteram[offs + 0x10] + (spriteram[offs + 0x01] & 0x01) * 256;
  		int sy = spriteram[offs + 0x00];
  
  		if (flip_screen_get(machine))
  			sy = 240 - sy;
  
  		drawgfx_transpen(bitmap,cliprect,
  			machine.gfx[1],
  			code, color,
  			flip_screen_x_get(machine), flip_screen_y_get(machine),
  			sx, sy, 0);
  	}
  }
  
  static void draw_status( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
  {
  	draw_status_row(machine, bitmap, cliprect, 0,  1);
  	draw_status_row(machine, bitmap, cliprect, 1,  0);
  	draw_status_row(machine, bitmap, cliprect, 2,  2);	/* these two are blank, but I dont' know if the data comes */
  	draw_status_row(machine, bitmap, cliprect, 33, 13);	/* from RAM or 'hardcoded' into the hardware. Likely the latter */
  	draw_status_row(machine, bitmap, cliprect, 35, 14);
  	draw_status_row(machine, bitmap, cliprect, 34, 15);
  }
  
  SCREEN_UPDATE( gotya )
  {
  	gotya_state *state = screen->machine().driver_data<gotya_state>();
  	tilemap_set_scrollx(state->m_bg_tilemap, 0, -(*state->m_scroll + (state->m_scroll_bit_8 * 256)) - 2 * 8);
  	tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
  	draw_sprites(screen->machine(), bitmap, cliprect);
  	draw_status(screen->machine(), bitmap, cliprect);
  	return 0;
  }
  