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// license:BSD-3-Clause
// copyright-holders:Mirko Buffoni, Nicola Salmoria, Tomasz Slanina
/***************************************************************************

  video.c

  Functions to emulate the video hardware of the machine.

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

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




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

  Callbacks for the TileMap code

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

TILE_GET_INFO_MEMBER(hotsmash_state::pb_get_bg_tile_info)
{
	int attr = m_videoram[tile_index + 0x400];
	int code = m_videoram[tile_index] + 256 * (attr & 0x7);
	int color = (attr & 0xf0) >> 4;
	tileinfo.set(0, code, color, 0);
}

TILE_GET_INFO_MEMBER(superqix_state_base::sqix_get_bg_tile_info)
{
	int attr = m_videoram[tile_index + 0x400];
	int bank = (attr & 0x04) ? 0 : 1;
	int code = m_videoram[tile_index] + 256 * (attr & 0x03);
	int color = (attr & 0xf0) >> 4;

	if (bank) code += 1024 * m_gfxbank;

	tileinfo.set(bank, code, color, 0);
	tileinfo.group = (attr & 0x08) >> 3;
}



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

  Start the video hardware emulation.

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

void hotsmash_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(hotsmash_state::pb_get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8,32,32);
}

void superqix_state::video_start()
{
	m_fg_bitmap[0] = std::make_unique<bitmap_ind16>(256, 256);
	m_fg_bitmap[1] = std::make_unique<bitmap_ind16>(256, 256);
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(superqix_state_base::sqix_get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);

	m_bg_tilemap->set_transmask(0, 0xffff, 0x0000); // split type 0 is totally transparent in front half
	m_bg_tilemap->set_transmask(1, 0x0001, 0xfffe); // split type 1 has pen 0 transparent in front half

	save_item(NAME(*m_fg_bitmap[0]));
	save_item(NAME(*m_fg_bitmap[1]));
}

rgb_t superqix_state_base::BBGGRRII(uint32_t raw)
{
	uint8_t const i = raw & 3;
	uint8_t const r = (raw >> 0) & 0x0c;
	uint8_t const g = (raw >> 2) & 0x0c;
	uint8_t const b = (raw >> 4) & 0x0c;

	return rgb_t(pal4bit(r | i), pal4bit(g | i), pal4bit(b | i));
}


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

  Memory handlers

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

WRITE8_MEMBER(superqix_state_base::superqix_videoram_w)
{
	m_videoram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset & 0x3ff);
}

WRITE8_MEMBER(superqix_state_base::superqix_bitmapram_w)
{
	if (m_bitmapram[offset] != data)
	{
		int x = 2 * (offset % 128);
		int y = offset / 128 + 16;

		m_bitmapram[offset] = data;

		m_fg_bitmap[0]->pix16(y, x)     = data >> 4;
		m_fg_bitmap[0]->pix16(y, x + 1) = data & 0x0f;
	}
}

WRITE8_MEMBER(superqix_state_base::superqix_bitmapram2_w)
{
	if (data != m_bitmapram2[offset])
	{
		int x = 2 * (offset % 128);
		int y = offset / 128 + 16;

		m_bitmapram2[offset] = data;

		m_fg_bitmap[1]->pix16(y, x)     = data >> 4;
		m_fg_bitmap[1]->pix16(y, x + 1) = data & 0x0f;
	}
}

WRITE8_MEMBER(hotsmash_state::pbillian_0410_w)
{
	/*
	 -------0  ? [not used]
	 ------1-  coin counter 1
	 -----2--  coin counter 2
	 ----3---  rom 2 HI (reserved for ROM banking , not used)
	 ---4----  nmi enable/disable
	 --5-----  flip screen
	*/

	if (data&0xc1) logerror("%04x: pbillian_0410_w with invalid bits: %02x\n",m_maincpu->pc(),data);
	machine().bookkeeping().coin_counter_w(0,BIT(data,1));
	machine().bookkeeping().coin_counter_w(1,BIT(data,2));

	membank("bank1")->set_entry(BIT(data,3));

	m_nmi_mask = BIT(data,4);
	if (!(m_nmi_mask)) m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
	flip_screen_set(BIT(data,5));
}

WRITE8_MEMBER(superqix_state_base::superqix_0410_w)
{
	/*
	 ------10  tile bank
	 -----2--  bitmap page select
	 ----3---  nmi enable/disable
	 --54----  rom bank
	*/
	if (data&0xc0) logerror("%04x: superqix_0410_w with invalid high bits: %02x\n",m_maincpu->pc(),data);
	/* bits 0-1 select the tile bank */
	if (m_gfxbank != (data & 0x03))
	{
		m_gfxbank = data & 0x03;
		m_bg_tilemap->mark_all_dirty();
	}

	/* bit 2 selects which of the two bitmaps to display (for 2 players game) */
	m_show_bitmap = BIT(data,2);

	/* bit 3 enables NMI */
	m_nmi_mask = BIT(data,3);
	//if (!(m_nmi_mask)) m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE); // test for later, could this explain the need for 4 NMIs per frame instead of one? Is the game manually retriggering NMI using the mask register, several times during the vblank period?

	/* bits 4-5 control ROM bank */
	membank("bank1")->set_entry((data & 0x30) >> 4);
}



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

  Display refresh

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

void hotsmash_state::pbillian_draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	uint8_t *spriteram = m_spriteram;
	int offs;

	for (offs = 0; offs < m_spriteram.bytes(); offs += 4)
	{
		int attr = spriteram[offs + 3];
		int code = ((spriteram[offs] & 0xfc) >> 2) + 64 * (attr & 0x0f);
		int color = (attr & 0xf0) >> 4;
		int sx = spriteram[offs + 1] + 256 * (spriteram[offs] & 0x01);
		int sy = spriteram[offs + 2];

		if (flip_screen())
		{
			sx = 240 - sx;
			sy = 240 - sy;
		}

		m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
				code,
				color,
				flip_screen(), flip_screen(),
				sx, sy, 0);
	}
}

void superqix_state_base::superqix_draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect)
{
	uint8_t *spriteram = m_spriteram;
	int offs;

	for (offs = 0; offs < m_spriteram.bytes(); offs += 4)
	{
		int attr = spriteram[offs + 3];
		int code = spriteram[offs] + 256 * (attr & 0x01);
		int color = (attr & 0xf0) >> 4;
		int flipx = attr & 0x04;
		int flipy = attr & 0x08;
		int sx = spriteram[offs + 1];
		int sy = spriteram[offs + 2];

		if (flip_screen())
		{
			sx = 240 - sx;
			sy = 240 - sy;
			flipx = !flipx;
			flipy = !flipy;
		}

		m_gfxdecode->gfx(2)->transpen(bitmap,cliprect,
				code,
				color,
				flipx, flipy,
				sx, sy, 0);
	}
}

uint32_t hotsmash_state::screen_update_pbillian(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
	pbillian_draw_sprites(bitmap,cliprect);

	return 0;
}

uint32_t superqix_state_base::screen_update_superqix(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1, 0);
	copybitmap_trans(bitmap,*m_fg_bitmap[m_show_bitmap],flip_screen(),flip_screen(),0,0,cliprect,0);
	superqix_draw_sprites(bitmap,cliprect);
	m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0, 0);
	return 0;
}