#include "emu.h"
#include "video/taitoic.h"
#include "includes/asuka.h"

/**************************************************************
                 SPRITE READ AND WRITE HANDLERS
**************************************************************/

WRITE16_HANDLER( asuka_spritectrl_w )
{
	asuka_state *state = space->machine().driver_data<asuka_state>();

	/* Bits 2-5 are color bank; in asuka games bit 0 is global priority */
	pc090oj_set_sprite_ctrl(state->m_pc090oj, ((data & 0x3c) >> 2) | ((data & 0x1) << 15));
}


/**************************************************************
                        SCREEN REFRESH
**************************************************************/

SCREEN_UPDATE( asuka )
{
	asuka_state *state = screen->machine().driver_data<asuka_state>();
	UINT8 layer[3];

	tc0100scn_tilemap_update(state->m_tc0100scn);

	layer[0] = tc0100scn_bottomlayer(state->m_tc0100scn);
	layer[1] = layer[0] ^ 1;
	layer[2] = 2;

	bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);

	/* Ensure screen blanked even when bottom layer not drawn due to disable bit */
	bitmap_fill(bitmap, cliprect, 0);

	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[0], TILEMAP_DRAW_OPAQUE, 1);
	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[1], 0, 2);
	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[2], 0, 4);

	/* Sprites may be over or under top bg layer */
	pc090oj_draw_sprites(state->m_pc090oj, bitmap, cliprect, 2);
	return 0;
}


SCREEN_UPDATE( bonzeadv )
{
	asuka_state *state = screen->machine().driver_data<asuka_state>();
	UINT8 layer[3];

	tc0100scn_tilemap_update(state->m_tc0100scn);

	layer[0] = tc0100scn_bottomlayer(state->m_tc0100scn);
	layer[1] = layer[0] ^ 1;
	layer[2] = 2;

	bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);

	/* Ensure screen blanked even when bottom layer not drawn due to disable bit */
	bitmap_fill(bitmap, cliprect, 0);

	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[0], TILEMAP_DRAW_OPAQUE, 1);
	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[1], 0, 2);
	tc0100scn_tilemap_draw(state->m_tc0100scn, bitmap, cliprect, layer[2], 0, 4);

	/* Sprites are always over both bg layers */
	pc090oj_draw_sprites(state->m_pc090oj, bitmap, cliprect, 0);
	return 0;
}
