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// license:BSD-3-Clause
// copyright-holders:Steve Ellenoff, Pierpaolo Prazzoli
/***************************************************************************

  Portraits
  video hardware emulation

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

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


WRITE8_MEMBER(portrait_state::bgvideo_write)
{
	m_background->mark_tile_dirty(offset/2);
	m_bgvideoram[offset] = data;
}

WRITE8_MEMBER(portrait_state::fgvideo_write)
{
	m_foreground->mark_tile_dirty(offset/2);
	m_fgvideoram[offset] = data;
}

inline void portrait_state::get_tile_info( tile_data &tileinfo, int tile_index, const uint8_t *source )
{
	int attr    = source[tile_index*2+0];
	int tilenum = source[tile_index*2+1];
	int flags   = 0;
	int color   = 0;

	/* or 0x10 ? */
	if( attr & 0x20 ) flags = TILE_FLIPY;

	switch( attr & 7 )
	{
		case 1:
			tilenum += 0x200;
			break;
		case 3:
			tilenum += 0x300;
			break;
		case 5:
			tilenum += 0x100;
			break;
	}

	if (tilenum<0x100)
		color = ((tilenum&0xff)>>1)+0x00;
	else
		color = ((tilenum&0xff)>>1)+0x80;

	SET_TILE_INFO_MEMBER(0, tilenum, color, flags );
}

TILE_GET_INFO_MEMBER(portrait_state::get_bg_tile_info)
{
	get_tile_info(tileinfo, tile_index, m_bgvideoram );
}

TILE_GET_INFO_MEMBER(portrait_state::get_fg_tile_info)
{
	get_tile_info(tileinfo, tile_index, m_fgvideoram );
}

void portrait_state::video_start()
{
	m_background = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(portrait_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
	m_foreground = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(portrait_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);

	m_foreground->set_transparent_pen(7);

	save_item(NAME(m_scroll));
}



void portrait_state::portrait_palette(palette_device &palette) const
{
	uint8_t const *const color_prom = memregion("proms")->base();

/*
    for (int i = 0; i < 0x40; i++)
    {
        int const data = color_prom[i];

        int const r = (data >> 0) & 0x7;
        int const g = (data >> 3) & 0x3;
        int const b = (data >> 5) & 0x7;

        palette.set_indirect_color(i, rgb_t(pal3bit(r), pal2bit(g), pal3bit(b)));
    }
*/

	for (int i = 0; i < 0x20; i++)
	{
		int const data = (color_prom[i + 0] << 0) | (color_prom[i + 0x20] << 8);

		int const r = (data >> 0) & 0x1f;
		int const g = (data >> 5) & 0x1f;
		int const b = (data >> 10) & 0x1f;

		palette.set_indirect_color(i, rgb_t(pal5bit(r), pal5bit(g), pal5bit(b)));

		// ?? the lookup seems to reference 0x3f colours, unless 1 bit is priority or similar?
		palette.set_indirect_color(i + 0x20, rgb_t(pal5bit(r >> 1), pal5bit(g >> 1), pal5bit(b >> 1)));
	}

	uint8_t const *const lookup = memregion("tileattr")->base();
	for (int i = 0; i < 0x800; i++)
	{
		uint8_t const ctabentry = lookup[i] & 0x3f;
		palette.set_pen_indirect(i, ctabentry);
	}
}


void portrait_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	uint8_t *source = m_spriteram;
	uint8_t *finish = source + 0x200;

	while( source < finish )
	{
		int sy      = source[0];
		int sx      = source[1];
		int attr    = source[2];
			/* xx-x---- ?
			 * --x----- flipy
			 * ----x--- msb source[0]
			 * -----x-- msb source[1]
			 */
		int tilenum = source[3];

		int color = ((tilenum&0xff)>>1)+0x00;

		int fy = attr & 0x20;

		if(attr & 0x04) sx |= 0x100;

		if(attr & 0x08) sy |= 0x100;

		sx += (source - m_spriteram) - 8;
		sx &= 0x1ff;

		sy = (512 - 64) - sy;

		/* wrong! */
		switch( attr & 0xc0 )
		{
		case 0:
			break;

		case 0x40:
			sy -= m_scroll;
			break;

		case 0x80:
			sy -= m_scroll;
			break;

		case 0xc0:
			break;

		}

		m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
				tilenum,color,
				0,fy,
				sx,sy,7);

		source += 0x10;
	}
}

uint32_t portrait_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	rectangle cliprect_scroll, cliprect_no_scroll;

	cliprect_scroll = cliprect_no_scroll = cliprect;

	cliprect_no_scroll.min_x = cliprect_no_scroll.max_x - 111;
	cliprect_scroll.max_x    = cliprect_scroll.min_x    + 319;

	m_background->set_scrolly(0, 0);
	m_foreground->set_scrolly(0, 0);
	m_background->draw(screen, bitmap, cliprect_no_scroll, 0, 0);
	m_foreground->draw(screen, bitmap, cliprect_no_scroll, 0, 0);

	m_background->set_scrolly(0, m_scroll);
	m_foreground->set_scrolly(0, m_scroll);
	m_background->draw(screen, bitmap, cliprect_scroll, 0, 0);
	m_foreground->draw(screen, bitmap, cliprect_scroll, 0, 0);

	draw_sprites(bitmap,cliprect);
	return 0;
}